Exhibit 10.45 AMENDMENT TO AND EXTENSION OF OFFICE LEASE This Amendment to and Extension of Office Lease (this "Amendment") is by and between MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY, a Massachusetts corporation ("Landlord"), through its agent, CORNERSTONE REAL ESTATE ADVISERS, INC., and ST. MARY LAND & EXPLORATION COMPANY, a Delaware corporation ("Tenant"), and is dated as of December 14, 2001. 1. Purpose. This Amendment amends and extends that certain lease agreement ------- titled Indenture dated June 1, 1989 (the "Original Lease") by and between The Equitable Life Assurance Society of the United States, a New York corporation ("Equitable"), and Parish Corporation, a Colorado corporation ("Parish"). Equitable conveyed its interest in the Property and in the Original Lease (as amended) to Landlord. Parish has assigned its interest in the Lease to Tenant and Tenant has assumed Parish's obligations under the Lease as set forth in paragraph 25, below. Landlord and Tenant desire to extend the currently effective term of the Original Lease (as amended), to modify the definition of the Premises, to provide for certain improvements to the Premises, and to make certain other modifications to the Original Lease. 2. Interpretation. For purposes of this Amendment, the term "Original -------------- Lease" means only the June 1, 1989 Indenture, described above (but not any amendment thereto) and paragraphs 1 through 3 of the Rider attached thereto. This Amendment amends the provisions and extends the term of the Original Lease. In the event of any inconsistency between the provisions of this Amendment and the provisions of the Original Lease, the provisions of this Amendment shall control. Capitalized terms used and not otherwise defined herein shall have the meanings set forth for them in the Original Lease. This Amendment and the Original Lease are referred to collectively as this "Lease." 3. Premises. As of the date of this Amendment, Tenant occupies all of -------- Floors 7, 9, and 11 and portions of Floors 6, 8, and 10 of Denver Financial Center Tower II, Denver, Colorado (the "Building") pursuant to the terms of the Original Lease (as amended). a. On or before approximately February 1, 2002, Landlord shall complete Tenant Improvements, as described in paragraph 10, below, to Suite 420 as shown on Exhibit A ("Suite 420") and to the 5th Floor of the Building. Upon --------- such completion, Tenant shall take possession of such space pursuant to the terms of this Lease. Tenant shall thereupon surrender all space on the 6th Floor, 8th Floor, and 10th Floor (to the extent occupied by Tenant) of the Building, Landlord shall complete Tenant Improvements to the 6th Floor on or before approximately April 1, 2002 pursuant to paragraph 10, below at which time Tenant shall commence occupancy thereof pursuant to this Lease. Tenant shall thereupon surrender all space on the 7th Floor, and Landlord shall complete Tenant Improvements to the 7th Floor on or before approximately June 1, 2002 pursuant to paragraph 10, below, at which time Tenant shall complete the vacation of the 11th Floor and commence occupancy of the 7th Floor pursuant to this Lease. In addition, this Lease shall be effective as of June 1, 2002 with respect to Tenant's occupancy of the 9th Floor of the Building. The estimated completion dates in this paragraph are dependent upon, among other things, Tenant's compliance with the provisions of paragraph 10, below, and shall be subject to delays caused by Force Majeure (as defined below). b. For purposes of this Lease, Suite 420 and the 5th, 6th, 7th, and 9th Floors of the Building shall constitute the "Premises" and be deemed to consist of approximately 42,660 rentable square feet. Rentable square footage computations are made by Landlord in accordance with BOMA method of measurement ANSI/BOMA Z65.1-1996. c. The Commencement Date under this Amendment with respect to each floor, or portion thereof, set forth above shall be the date which is the earlier of (i) the date Tenant commences actual occupancy of such portion of the Premises and (ii) the date which is the later of the date set forth in subparagraph (a), above, or the date such portion of the Premises has been substantially completed in accordance with the plans as determined in writing by the architect subject only to punch-list items which will not materially interfere with Tenant's occupancy of such portion of the Premises and, in the case of the 9th Floor, June 1, 2002. The termination date with respect to leased space under the Original Lease shall be the date on which Tenant completely vacates and surrenders to Landlord all space on a particular floor in the condition required by the Original Lease, except with respect to any floor or portion thereof which is intended by the Plans to be demolished and rebuilt as part of the Premises. 4. Property. For purposes of determining operating expenses under paragraph -------- 1(b) of the Lease, "Property" means the commercial office structure, together with all appurtenant plazas, subgrade areas, and other improvements situated on the land and known as the "Denver Financial Center Tower I and Tower II", and Tenant's share means 9.79% (42,660/435,672). 5. Effective Date and Rent Commencement. Payment of rent with respect to ------------------------------------- each portion of the Premises under this Lease shall commence three months after the Commencement Date as determined under paragraph 3(c), above. The estimated dates on which rent shall commence with respect to various floors comprising the Premises are as follows: Suite 420 and 5th Floor: May 1, 2002 6th Floor: July 1, 2002 7th and 9th Floors: September 1, 2002 As Tenant vacates floors as contemplated by paragraph 3, above, rent payable under the Original Lease for such vacated floors shall terminate. Landlord and Tenant intend that, so long as Tenant's relocation from currently occupied space to newly remodeled portions of the Premises in a commercially reasonable and business-like matter, rent payments due with respect to the space being vacated shall terminate as of the Commencement Date with respect to the new space. Except as provided in this paragraph 5 and paragraph 3(c), above, the effective date for the application of this Amendment shall be June 1, 2002. 2 6. Lease Term. The Lease Term for the Premises shall expire May 31, 2012. ---------- 7. Rent. Tenant shall pay Base Rent, Additional Rent, and all other amounts ---- due to Landlord under this Lease on the first day of each month during the Term (and pro rata for any partial month) at the office of Landlord's building manager, currently Transwestern Commercial Services, 1775 Sherman Street, Lobby Level, Denver, CO 80203 without demand, the same being waived and without set-off or deduction, according to the following schedule: Annual Annual Monthly Time Period Rent Per r.s.f. Rent Rent - ----------- --------------- ---- ---- Commencement Date - 05/31/04 $17.50 per r.s.f $746,550.00 $62,212.50 6/1/04 - 05/31/07 $18.50 per r.s.f $789,210.00 $65,767.50 6/1/07 - 05/31/12 $19.50 per r.s.f. $831,870.00 $69,322.50 8. Base Year. Under this Lease, the Base Year for Taxes and Operating ---------- Expenses shall be the full calendar year 2002. Each calendar year, Tenant shall pay its Tenant's share (9.79%) of the difference between Operating Expenses and Taxes for such calendar year and actual Operating Expenses and Taxes incurred during the Base Year. 9. Taxes and Operating Expenses. For purposes of the provisions of ------------------------------- paragraph 1(b) of the Original Lease, Taxes and Operating Expenses shall have the following meanings: Taxes: The term "Taxes" means all taxes and assessments, special or otherwise, levied upon or with respect to the Building and the Property (including air rights) imposed by federal, state or local government, use, occupancy, excise or other similar taxes, and taxes on rent or other income from the Building (computed, in case of a graduated tax as if Landlord's income from the Building were Landlord's sole taxable income), the cost of contesting by appropriate proceeding the amount or validity of any of the aforementioned taxes or assessments, and taxes and assessments of every kind and nature whatsoever levied or assessed and imposed on Landlord in lieu of or in substitution for existing or additional real or personal property taxes or assessments on the Building or the Property; except that Taxes shall not include general income, franchise, capital stock, estate or inheritance tax, unless Landlord equitably determines that such Taxes are in lieu of or in substitution for real estate taxes. In the case of special taxes and assessments payable in installments, only the amount of such installment due and payable during a single calendar year shall be included in Taxes for that year. 3 Operating Expenses: The term "Operating Expenses" shall be deemed to include all costs which, for federal tax purposes, may be expensed rather than capitalized and which Landlord will incur in owning, maintaining and operating the Building or the Property, exclusive of Taxes, as hereinabove defined, mortgage interest and depreciation. Without limitation to the foregoing, the term "Operating Expenses" shall mean those costs incurred during each year of the term of the Lease in respect of the operations and maintenance of the Property and the Building in accordance with accepted principles of sound management and accounting practices as applied to the operation and maintenance of comparable office buildings in the Central Business District of Denver, Colorado, including the cost of or charges for the following by way of illustration, but without limitation: landscaping and snow removal, water and sewer, insurance premiums, licenses, permits and inspections, heat, light, electrical power, steam, security, janitorial services, maintenance of and repairs to equipment servicing the Property or the Building, window cleaning, refuse removal services, air-conditioning, supplies, materials, equipment and tools, administration and management of the Property and the Building, changing the Building's electric service provider and associated installation, maintenance, repair and service costs, changing any company providing electricity service, personal property taxes on the personal property used in the operation of the Property or the Building, the cost, as amortized over the useful life of the improvement as reasonably determined by Landlord with interest at one and one-half percent (l1/2%) above the prime rate announced from time to time by the Wells Fargo Bank of Denver on the unamortized amount of any capital improvement made after the Effective Date which reduces Operating Expenses, but in an amount not to exceed such reduction for the relevant year, and the cost of contesting by appropriate proceedings the applicability to the Property or the Building or the validity of any statute, ordinance, rule or regulation affecting the Property or the Building which might increase Operating Expenses. Operating Expenses shall not include: (i) costs for repairs or other work occasioned by fire, windstorm or other insured casualty to the extent covered by insurance proceeds; (ii) costs incurred in leasing or procuring new tenants (i.e., lease commissions, advertising costs and costs for renovating space for new tenants); (iii) legal costs in enforcing the terms of any lease; (iv) interest or amortization payments on any mortgage or mortgages; (v) rental for any ground or underlying lease or leases; (vi) salaries or other compensation paid to any executive employees above the grade of Senior Property Manager (unless the resident Senior Property Manager has executive responsibilities, in which case such person's salary shall be allocated between duties as property manager, which shall be charged as an Operating Expense, and duties as an executive, which shall not be allocated as an Operating Expense); (vii) wages, salaries, or 4 other compensation paid for clerks or attendants in concessions or newsstands operated by Landlord; and (viii) those exclusions from Operating Expenses listed on Exhibit B to this Amendment. --------- If Landlord makes any capital improvement during the term of the Lease in order to comply with safety or any other requirements of any federal, state or local law or governmental regulation that is enacted after the date of this Amendment, then the cost as amortized over the useful life of the improvement as reasonably determined by the Landlord with interest at one and one-half percent (l1/2%) above the prime rate announced from time to time by Wells Fargo Bank of Denver, shall be deemed an Operating Expense in each of the calendar years during which such amortization occurs, and Tenant shall be responsible for Tenant's Share of any such amortized expense. The remaining terms of Paragraph 1(b) are not modified. 10. Tenant Improvements. ------------------- a. Landlord shall provide to Tenant an allowance (the "TI Allowance") of up to $32.70 per rentable square foot of Suite 420 and Floors 5, 6, and 7 of the Building, approximately 33,181 rentable square feet, or $1,085,018.70. Such allowance shall be utilized by Tenant solely for the architecture, design, engineering, construction, and construction management (including project management services of CRESA Partners or an affiliate up to a maximum of $2.00 per rentable square foot) in the construction of Tenant Improvements to the Premises. Landlord shall charge a construction management fee of 2% of the hard construction costs which shall be paid from the TI Allowance. "Hard construction costs" include all costs of labor and materials related to the physical construction of the Tenant Improvements and do not include fees of architects and engineers, project management fees, or insurance. Tenant Improvements shall include only those additions and improvements which are considered real property under Colorado law, including capital improvements to the Building as approved by Landlord and shall be installed only pursuant to detailed plans and specifications which have been approved in advance by Landlord, which approval shall not be unreasonably withheld or delayed. Landlord and Tenant have approved the preliminary space plan (the "Preliminary Drawings") for improvements to the Premises (as finally embodied in the detailed plans and specifications, the "Tenant Improvements") prepared by W.E. Kieding Interior Architects (the "Architect"). Landlord shall review the detailed plans and specifications described above and provide comments to Tenant within five (5) business days of delivery. Thereafter, comments on revised plans and plan revisions shall be provided no later than two (2) business days after request by the other party. i. All such Tenant Improvements shall be completed by a contractor reasonably approved by Landlord pursuant to a contract between such contractor and Landlord. ii. Landlord shall require its general contractor to solicit written bids from reputable subcontractors and suppliers with respect to 5 all material subcontracts and material purchases. Such subcontracts and contracts for material purchases shall be awarded to the lowest bidder unless Tenant consents to use of a different subcontractor or supplier, and such consent shall be granted on a commercially reasonable basis. The contract with the general contractor shall contain the provisions set forth in this subparagraph. iii. Landlord reserves the right to require that any Tenant Improvement affecting any significant system in the Building to be completed only by Landlord's contractor or subcontractor at Tenant's expense, provided the charges of such contractors are competitive with others in their trade. iv. Tenant shall be liable to pay any amount for such Tenant Improvements in excess of the amount of the allowance set forth above ("Excess Costs"). Landlord shall promptly notify Tenant upon Landlord's discovery that there are Excess Costs, whereupon Tenant shall have the opportunity to make changes to the approved plans so as to reduce the costs. Landlord shall, upon Tenant's written request, finance an amount to pay for Excess Costs not to exceed $1.00 per rentable square foot or $33,181.00. Such amount shall be amortized over the remaining Term of the Lease at an interest rate of 12% per year and paid to Landlord in equal installments monthly as Base Rent. b. Tenant may authorize changes in the Tenant Improvements during construction only by written change order. All such changes will be subject to Landlord's prior written approval, which approval shall not be unreasonably withheld or delayed, and shall be subject to Tenant's final agreement in writing as to any delays attributable to the change and the costs of such change (including availability of Landlord's financing and Tenant electing to have Landlord finance such costs as provide in subparagraph (a)(iv), above), all of which costs in excess of the TI Allowance shall be prepaid by Tenant. Tenant shall confirm its final agreement to a change order by executing a written agreement and paying to Landlord any amounts payable in connection with the change order. If Tenant fails to deliver the final agreement or payment in a timely manner, Tenant shall be deemed to have withdrawn the proposed change order, and Landlord will not proceed with the change. c. In addition to the TI Allowance described above, Landlord shall provide a TI Allowance for the portion of the Premises located on the 9th Floor. Such TI Allowance may be used with respect to Tenant Improvements for which a building permit is issued on or after June 1, 2002 but prior to June 1, 2004. The amount of the TI Allowance shall be $32.70 per rentable square foot of the Premises on the 9th Floor being improved multiplied by a fraction the numerator which is the number of full calendar months remaining in the term of the Lease subsequent to the date of issuance of the building permit and the denominator of which is 120. The provisions of the preceding subparagraph (a) shall apply to the construction of Tenant Improvements to the 9th Floor. In the event the costs of Tenant Improvements to the 9th Floor exceed the TI Allowance, at the request 6 of Tenant, Landlord shall advance up to an additional $1.00 per square foot on the terms and conditions set forth in paragraph 10(a)(iv), above. d. Tenant shall receive no credit for any unused TI Allowance. e. The plans for constructing the Tenant Improvements contemplate that the Landlord will make certain repairs and replacements to base building systems, and the expense of such repairs and replacements are to be paid from the TI Allowance. Any repairs or replacements to the base building systems in addition to those contemplated by the plans which are necessary in order to provide services to the Premises as required by this Amendment or required by appropriate authorities to comply with applicable building codes shall be the responsibility of Landlord. f. Landlord shall notify Tenant in writing at such time as Landlord deems the construction of a portion of the Tenant Improvements (which portion shall not be less than all of the Tenant Improvements for a particular floor) to be complete and the Premises ready for occupancy, which notice shall be accompanied by a certificate of the Architect that the Tenant Improvements have been substantially completed in accordance with the approved plans. Upon Landlord so notifying Tenant of completion, Landlord, Tenant, and the contractor shall conduct an inspection of the Premises to verify that the applicable Tenant Improvements have been satisfactorily completed. As a part of the inspection, the inspecting parties shall prepare and execute a punch-list of items of incomplete work. Landlord shall cause the general contractor to promptly commence the punch-list work and to complete all such work within thirty (30) days after the date of the punch-list. g. Subject to Tenant complying with reasonable requirements relating to balancing the HVAC system, Landlord shall maintain the Premises according to ASHRAE standards as set forth in Exhibit C to this Amendment. Tenant's ---------- requirements may include the following: maintaining window coverings in a closed position during the cooling season; not covering registers or returns; not making substantial changes in the location of electrical equipment, lights, and other heat generators compared to the plans; not accessing or changing thermostats without input from Building management; and not using space heaters or other substantial generators of heat in the Premises. Landlord shall provide electrical power to the Premises, exclusive of the power required to run base building systems and building standard lighting, in an amount equal to or greater than 1.7 watts per rentable square foot based on an "Average Running Load" of Tenant's low voltage electrical demand. In addition, Landlord shall make available to Tenant and the Premises the additional electrical service as set forth on Exhibit C to this Amendment. Landlord shall not require Tenant to --------- install a submeter with respect to electrical service unless there is a material change in Tenant's electrical usage from that contemplated by the plans. Electrical usage, as shown on the Architect's plans dated November 2, 2001, does not constitute "heat generating machines or equipment" which triggers certain rights of Landlord under Section 2(b) of the Original Lease. 7 h. Upon default by Landlord in providing electrical service to the Premises, Tenant shall have the right to an abatement of rent for each day in which there has been an Interruption of Electrical Service (as defined below). Landlord shall be deemed to be in default in providing electrical service only if, in any 12-month period, there have been more than two Interruptions in Electrical Service or if, during the Term, there have been more than four Interruptions in Electrical Service. An Interruption in Electrical Service shall mean that: i. there has been a failure to provide electrical service to any part of the Premises at the minimum levels required by this Amendment; ii. the interruption has, in Tenant's reasonable opinion, materially interfered with its ability to conduct its business; iii. the interruption is for reasons other than Force Majeure, except insufficiency in capacity of the Building's base systems shall not be deemed to be beyond Landlord's reasonable control; and iv. Tenant has given Landlord written notice of such interruption and interference within one business day of its occurrence. Upon any Interruption of Electrical Service, Landlord will use its best efforts to determine the cause of the interruption and remedy the same as soon as possible. Thereafter, Landlord shall notify Tenant as to what Landlord has determined to be the cause of the Interruption of Electrical Service and how it has remedied the same. Tenant, through its engineers and consultants, shall have the right, at Tenant's expense, to participate in investigating the cause of the interruption. Tenant's remedies hereunder shall be in addition to any other remedies available to Tenant. 11. Brokerage. Tenant warrants to Lender that Tenant has not dealt with any broker, agent, or other person who may be entitled to a commission in connection with the modification and extension of the Lease other than CRESA Partners and Cushman & Wakefield of Colorado, Inc. ("Cushman"). Cushman is Landlord's agent and owes a fiduciary obligation to Landlord only. Tenant is represented by CRESA Partners which owes a fiduciary obligation to Tenant only. Landlord agrees to pay CRESA Partners a brokerage commission with respect to the execution of this Lease equal to $178,140.00. One half of such commission, or $89,070.00, will be paid to CRESA Partners upon execution and delivery of this Amendment to Landlord and the balance shall be paid promptly following Landlord's receipt of Tenant's rent payment due May 1, 2002 and Tenant's having taken full possession of Suite 420 and the 5th and 6th Floors to the extent such portions of the Premises are ready for occupancy. 12. Right of First Refusal. ---------------------- a. Subject to the terms and conditions contained herein, Tenant shall have a continuing right ("Option") to lease all or part of the remaining office space located on the 4th and 8th Floors of the Building, respectively (the 8 "Option Space"), on and subject to the terms of this paragraph 12. This Option shall be subject to Landlord's right to lease all or part of the Option Space which becomes subject to a Letter of Intent to Lease ("LOI") between a prospective tenant and Landlord from time to time ("Offer Space") provided Landlord gives Tenant notice of its intent to lease such Offer Space and Tenant does not exercise its Option to lease such Offer Space as provided in subparagraph (b), below. b. If during the initial Term of this Lease, Landlord enters an LOI, Landlord shall promptly provide Tenant with written notice (the "Offer Notice") that Landlord has entered into the LOI. The Offer Notice shall identify the Offer Space, the name of the prospective tenant, and the rent rate. Tenant shall have seven (7) business days following the Offer Notice within which to exercise its Option to lease the Offer Space in accordance with the terms set forth below. Should Tenant indicate that it is not prepared to lease the Offer Space, whether by notice to Landlord or by failing to respond to the Offer Notice within the seven (7) business day period, then Tenant shall be deemed to have waived its Option with respect to such Offer Space. Upon such waiver, for a period of 90 days Landlord may lease the Offer Space to the prospective tenant at a rent not less than 90% of the rent set forth in the LOI without having to re-offer the Offer Space to Tenant. If during such 90-day period Landlord desires to lease the Offer Space to the prospective tenant named in the LOI for a rent less than 90% of the rent set forth in the LOI, Landlord shall notify Tenant of such fact and again offer the Offer Space to Tenant and Tenant shall accept or reject such offer within two business days. If Tenant fails to respond within such two business-day period, Tenant shall be deemed to have rejected the offer and Landlord may lease the Offer Space within the original 90-day period to the prospective tenant pursuant to the LOI at not less than 100% of the rent as so modified. If Landlord does not lease the Offer Space to the prospective tenant within the 90-day period, Tenant shall again have its continuing Option to lease the Offer Space on the terms provided in this paragraph 12 and Landlord shall not lease the Offer Space unless Landlord re-offers the Offer Space to Tenant on the terms provided in subparagraph (a), above. c. Tenant's Option shall be the Option to lease the Option Space at the then current rent per square foot under the Lease and otherwise in accordance with the terms set forth below, and subject to existing rights to expand, extend, or renew as set forth in this Lease. The term of the lease of the Option Space shall be co-terminus with the term of the Lease, including extensions. Landlord shall not be obligated to provide any allowance to Tenant for tenant improvements or any other expense. d. If Tenant exercises such Option, the effective date of Tenant's leasing of the Option Space (the "Option Space Effective Date") shall be the earlier to occur of (i) the date Tenant occupies the Option Space or (ii) the date ninety (90) days following Tenant's notice of its intent to exercise its option to lease the Option Space. e. The Option Space shall be leased in "as is" condition, and all other improvements in the Option Space shall be Tenant's responsibility at Tenant's cost, and shall be made in accordance with the applicable provisions of 9 this Lease and in compliance with all applicable laws, ordinances, and regulations. The rights of Tenant under this provision shall not be severed from this Lease or separately sold, assigned, or otherwise transferred, and shall terminate at the expiration of the original Lease term. 13. Option to Renew. Tenant, but not any assignee or sublessee of Tenant, --------------- is hereby granted the option to renew this Lease for one (1) term of five (5) years. Provided Tenant is not in default (after notice and expiration of any applicable cure period), Tenant may exercise such option upon written notice to Landlord with no less than nine (9) months prior written notice before the expiration of the current Term. If Tenant fails to exercise the option by the date set forth in the preceding sentence, then Tenant shall be deemed to have elected not to exercise the option and this renewal option shall be deemed to have terminated. Time is of the essence in the exercise of such option. Notwithstanding the preceding, an assignee of Tenant which is owned or under common ownership with Tenant or which owns Tenant may exercise the option to renew set forth in this paragraph 13, provided such assignee's financial position is reasonably acceptable to Landlord and provided Tenant continues to be a party to the Lease during such renewal term. For purposes of the preceding sentence, ownership means at least 51% equity ownership and 51% voting control. a. The renewal term will be on the same terms and conditions as those contained in this Lease except as follows: i. There shall be no further rights to renew after the exercise of the renewal option; ii. Any tenant improvement allowance, rental concessions, or the like, granted by Landlord to Tenant in the initial lease term shall not be applicable in the renewal term; and iii. The rent for the renewal term shall be the "Fair Market Rental Value" defined as the amount per rentable square foot for the Premises during the renewal term which is representative of and comparable of the consideration charge for substantially comparable office space in the Central Business District of Denver, Colorado taking into consideration that the renewal is being made on an "as is" basis without any tenant improvement allowance, rental concessions, or the like. b. In the event the parties cannot agree on Fair Market Rental Value, either Landlord or Tenant may, by notice to the other, commence an arbitration proceeding to determine Fair Market Rental Value as follows: i. The arbitration shall be conducted by a three-member panel composed of licensed Colorado real estate brokers, whose brokerage activities for the last ten years have concentrated in office leasing in the Central Business District of Denver, Colorado. Each of Landlord and 10 Tenant shall, by notice to the other, identify one such broker to act as an arbitrator. Within five days of such appointment, the two arbitrators so selected shall select a third arbitrator meeting the preceding qualifications, who shall act as chairman of the arbitration panel. In the event a party fails to appoint an arbitrator, the arbitration shall be conducted by the single arbitrator appointed by the other party. In the event the two arbitrators cannot select a third arbitrator within the applicable time period, such arbitrator shall be selected by the President of the Denver Board of Realtors upon the request of either party. ii. The arbitrators shall be impartial. iii. Within 15 days of the appointment of the third arbitrator, each of the two party-appointed arbitrators shall prepare a memorandum setting forth such arbitrator's estimate of the Fair Market Rental Value of the Premises, including all comparable leases relied on and the reasoning and rationale of such arbitrator. iv. Within five days following the delivery of the reports of the two party-appointed arbitrators to the third arbitrator, the third arbitrator shall select as the Fair Market Rental Value the amount determined by one or the other of the party-appointed arbitrators which, in the determination of the third arbitrator, is closest to Fair Market Rental Value as determined by such third arbitrator. v. The place of the arbitration will be in the Central Business District of Denver, Colorado. The rules of the arbitration shall be established as needed by the third arbitrator. The decision of the arbitrators shall be final, binding, and conclusive on Landlord and Tenant and shall not be reviewable by a court other than on account of fraud. Once the arbitrators have been appointed, neither the parties nor their respective counsel may contact the arbitrators except in writing with copies to the other party and its counsel or in telephone conversations or meetings with counsel for both of the parties participating. The fees of the two party-appointed arbitrators shall be paid by the respective appointing party. The fees of the third arbitrator shall be shared equally by the parties. All expenses authorized by the third arbitrator in connection with the arbitration shall be shared by the parties. 14. Early Termination Option. Subject to Tenant's compliance with the -------------------------- provisions of this paragraph, Tenant may, from time to time, surrender to Landlord all or a portion of the Premises (the "Surrendered Premises"). To exercise such early termination option, Tenant shall comply with each of the following: a. Tenant shall provide written notice to Landlord at least nine calendar months in advance of the date of termination. b. The date of termination shall be as of the last day of a calendar month. 11 c. The Surrendered Premises shall include all of the space on the floor or floors on which the Surrendered Premises is located. d. On the first day of the month in which the termination date occurs, Tenant shall pay to Landlord as Additional Rent the unamortized Transaction Costs with respect to the Surrendered Premises. "Transaction Costs" means all of the following costs actually paid by Landlord and not reimbursed by Tenant: TI Allowance, Excess Costs, real estate brokerage commissions, and Landlord's legal expenses. As of the date of this Amendment, the TI Allowance is $32.70 per rentable square foot, and real estate brokerage commissions are $6.65 per rentable square foot; Landlord's legal expenses will be determined as of the execution of this Amendment. Because the actual Transaction Costs will not be known until after the Tenant Improvements are completed, upon the request of either party, the parties will confirm in writing the final actual Transaction Costs. All Transaction Costs shall first be allocated on a per square footage basis (and on a temporal basis to account for different Commencement Dates) as between the Surrendered Premises and the balance of the Premises, and such Transaction Costs allocated to the Surrendered Premises shall then be prorated by multiplying such expenses by a fraction, the numerator of which is the number of calendar months remaining in the Term divided by the total number of months from the first month for which Base Rent was paid through the last month of the Term. e. The termination right granted by this paragraph shall not be effective until after May 31, 2008. f. At the time Tenant makes the payment required by subparagraph (d), above, Tenant shall pay Landlord a termination fee equal to the amount of Rent for the Surrendered Premises which would have been due for the first three months following the termination date but for such early termination. 15. Parking. Landlord grants to Tenant the right, in common with others ------- authorized by Landlord, to use the parking facilities owned by Landlord which are part of the Property. As of the commencement of this Lease, Landlord shall continue to provide to Tenant parking in 20 reserved spaces and 32 non-reserved spaces as provided in the Original Lease (as amended). In the event Tenant expands the Premises subject to this Lease, additional parking shall be provided at a ratio of one parking space per each 1,208 rentable square feet added to the Premises. In the event Tenant exercises its rights of early termination under paragraph 14, above, the number of parking spaces provided to Tenant under this Lease shall be reduced at a ratio of one parking space per each 1,208 rentable square feet subtracted from the Premises (to the extent the Premises is 42,660 square feet or larger) or at the ratio of one parking space per each 820 rentable square feet subtracted from the Premises to the extent the Premises is less than 42,660 square feet. Tenant shall pay Landlord the fee for parking monthly, in advance, with monthly Rent. Through December 31, 2002, such parking fee shall be the same as charged on September 18, 2001 under the Original Lease. Thereafter, the parking fee will be adjusted to the then current market rate. Thereafter, any adjustment in market rate shall be limited, on a cumulative 12 basis, to 4% per year. Parking spaces which are currently allocated to and used by Tenant's subtenants D.C. Dudley & Associates and Summo Minerals, shall continue to be made available to them for the Term of this Lease at the parking fee determined under this paragraph. a. Landlord, at its sole election, shall designate types and locations of parking spaces within the parking facilities provided, however, any such designation shall be uniformly applied and shall not unfairly favor any tenant in the Building. Landlord shall not move the location of Tenant's 20 reserved parking spaces and the reserved parking spaces which are currently allocated to and used by Tenant's subtenants, D.C. Dudley & Associates and Summo Minerals, unless required to do so by events not in Landlord's control; provided, however, that Landlord will use good faith efforts to return such spaces to their original location as soon as practical. b. In addition to the limited rate increases in parking fees described above, Landlord may increase the parking fee by the amount of any fee or charge levied, assessed, imposed, or required to be paid to any governmental authority on account of the parking of motor vehicles. c. If requested by Landlord, Tenant shall notify Landlord of the license plate number, year, make, and model of each automobile entitled to use the parking facilities pursuant to this Lease, and if requested by Landlord, such automobile shall be identified by identification tags and stickers and only such designated automobiles will be permitted to use the parking facilities. d. Parking facilities are provided solely for the accommodation of Tenant. Landlord disclaims any responsibility or liability of any kind whatsoever, from whatever cause, with respect to automobile parking areas and adjoining streets, sidewalks, driveways, property, and passage ways, or the use thereof by Tenant or Tenant's employees, customers, agents, contractors or invitees. During the period CRESA is providing construction management services as contemplated by paragraph 10(a), above, a representative of CRESA may park in the loading dock area of the Building pursuant to reasonable requirements of Landlord, including sign-in procedures and depositing keys for such vehicle with Building security. 16. Storage Space Agreement. Tenant entered into a certain Storage Space ------------------------ Agreement dated September 30, 1991, with Equitable, the then owner of the Building. The Storage Space Agreement shall continue in effect at the current rate of $10.00 per square foot. The Storage Space Agreement shall terminate as of the last day of the Term of this Lease. Landlord may change the amount of rent payable with respect to Storage Space Agreement, provided such rent shall not be increased on a cumulative basis more than 3% per year from January 1, 2002. 13 17. Hazardous Materials. ------------------- a. Definition of Hazardous Materials. The term "Hazardous Materials" --------------------------------- for purposes hereof shall mean any chemical, substance, materials or waste or component thereof which is now or hereafter listed, defined or regulated as all hazardous or toxic chemical, substance, materials or waste or component thereof by any federal, state or local governing or regulatory body having jurisdiction ("Governmental Body"), or which would trigger any employee or community "right-to-know" requirements adopted by any such body, or for which any such body has adopted any requirements for the preparation or distribution of a materials safety data sheet ("MSDS"). Landlord represents that, to its actual knowledge, there are no Hazardous Materials currently existing on the Property, except as may be disclosed in any report or document delivered to Tenant by Landlord, Hazardous Materials brought to the Premises by Tenant or Tenant's agents, commercially reasonable amounts of Hazardous Materials which are constituents of cleaners, solvents, or ink, in commercially reasonable quantities, as used in normal day-to-day operations of the Building and the Premises, or Hazardous Materials contained in office equipment, appliances, electrical fixtures, all of which are not in violation of applicable law. b. No Hazardous Materials. Tenant shall not transport, use, store, ----------------------- maintain, generate, manufacture, handle, dispose, release, or discharge any Hazardous Materials. However, the foregoing provisions shall not prohibit the transportation to and from, and use, storage, maintenance and handling within the Premises of Hazardous Materials customarily used in the business or activity expressly permitted to be undertaken in the Premises under Article 6, provided: (a) such Hazardous Materials shall be used and maintained only in such quantities as are reasonably necessary for such permitted use of the Premises and the ordinary course of Tenant's business therein, strictly in accordance with applicable Law, highest prevailing standards, and the manufacturers' instructions therefor, (b) such Hazardous Materials shall not be disposed of, released or discharged in the Building, and shall be transported to and from the Premises in compliance with all applicable Laws, and as Landlord shall reasonably require, (c) if any applicable Law or Landlord's trash removal contractor requires that any such Hazardous Materials be disposed of separately from ordinary trash, Tenant shall make arrangements at Tenant's expense for such disposal directly with a qualified and licensed disposal company at a lawful disposal site (subject to scheduling and approval by Landlord), and (d) any remaining such Hazardous Materials shall be completely, properly and lawfully removed from the Building upon expiration or earlier termination of this Lease. Any clean up, remediation and removal work shall be subject to Landlord's prior written approval (except in emergencies), and shall include, without limitation, any testing, investigation, and the preparation and implementation of any remedial action plan required by any Governmental Body or reasonably required by Landlord. If Landlord or any Lender or Governmental body arranges for any tests or studies showing, that this Article has been violated by Tenant, Tenant shall pay for the costs of such tests. 14 c. Notices To Landlord. Tenant shall promptly notify Landlord of: (i) ------------------- any enforcement, cleanup or other regulatory action taken or threatened by any governmental or regulatory authority with respect to the presence of any Hazardous Materials on the Premises or the migration thereof from or to other property, (ii) any demands or claims made or threatened by any party relating to any loss or injury resulting from any Hazardous Materials on the Premises, (iii) any release, discharge or non-routine, improper or unlawful disposal or transportation of any Hazardous Materials on or from the Premises or in violation of this Article, and (iv) any matters where Tenant is required by Law to give a notice to any Governmental Body respecting any Hazardous Materials on the Premises. Landlord shall have the right (but not the obligation) to join and participate, as a party, in any legal proceedings or actions affecting the Premises initiated in connection with any environmental, health or safety law. At such times as Landlord may reasonably request, Tenant shall provide Landlord with a written list, certified to be true and complete, identifying any Hazardous Materials then used, stored, or maintained upon the Premises, the use and approximate quantity of each such materials, a copy of any MSDS issued by the manufacturer therefor, and such other information as Landlord may reasonably require or as may be required by Law. d. Indemnifications. Tenant will indemnify, defend (by counsel ---------------- reasonably acceptable to Landlord), protect, and hold Landlord and each of Landlord's partners, employees, agents, attorneys, successors and assigns, free and harmless from and against any and all claims, liabilities, penalties, forfeitures, losses or expenses (including attorney's fees) or death of or injury to any person or damage to any property whatsoever, arising from or caused in whole or in part directly or indirectly, by: i. the presence in, on, under, or about the Premises or discharge in or from the Premises of any Hazardous Materials placed in, under or about, the Premises by Tenant or at Tenant's direction, excluding any tenant improvement work done by Landlord; or ii. Tenant's use, analysis, storage, transportation, disposal, release, threatened release, discharge, or Generation of Hazardous Materials to, in, on, under, about, or from the Premises; or iii. Tenant's failure to comply with any Hazardous Materials Law applicable hereunder to Tenant. Landlord will indemnify, defend (by counsel reasonably acceptable to Tenant), protect, and hold Tenant and each of Tenant's employees, agents, attorneys, successors and assigns, free and harmless from and against any and all claims, liabilities penalties, forfeitures, losses or expenses (including attorney's fees) or death of or injury to any person or damage to any property whatsoever, arising from or caused in whole or in part, directly or indirectly, by 15 (1) the presence in, on, under or about the Premises or the Building or discharge in or from the Premises or the Building of any Hazardous Materials existing as of the date of this Amendment (and not placed or released on the Premises by Tenant) or placed, in, on, under, or about the Premises or the Building by Landlord or at Landlord's direction; or (2) Landlord's use, analysis, storage, transportation, disposal, release, threatened release, discharge or generation of Hazardous Materials to, in, on, under, about or from the Premises or the Building; or (3) Landlord's failure to comply with any Hazardous Materials Law. The obligations of each party ("Indemnifying Party") pursuant to this paragraph includes, without limitation, and whether foreseeable or unforeseeable, all costs of any required or necessary repair, cleanup or detoxification or decontamination of the Premises or the Building, and the preparation and implementation of any closure, remedial action or other required plans in connection therewith, and survives the expiration or earlier termination of the term of the Lease. 18. Alterations. Tenant shall make no alterations or additions to the ----------- Premises without the prior written consent of Landlord, which consent shall not be unreasonably withheld. Tenant shall complete any alterations authorized by Landlord in good and workman like manner, using contractors and pursuant to a general contract reasonably acceptable to Landlord, fully paid for and free from liens, in accordance with plans and specifications approved by Landlord. In exercising Landlord's reasonable discretion under this paragraph 18, Landlord may take into consideration the following, without limitation: the effect of any proposed alteration or addition on any base system of the Building, the need for additional power, the need to rebalance the HVAC system, the effect on other portions of the Building, the business reputation and financial qualification of the contractors and their experience with the Building, and similar factors. Tenant shall give Landlord at least 10 days prior written notice of the commencement of any alterations to afford Landlord the opportunity to post a notice of nonresponsibility, which notice Tenant will maintain in place throughout the period of construction. Tenant indemnifies Landlord on account of any mechanics', materialmen's, or similar lien or encumbrance to be filed against the Premises or Building in connection with any such work undertaken by Tenant. Tenant shall remove any such lien to Landlord's satisfaction within 20 days from its recordation, and if Tenant fails to do so, Landlord may take whatever action Landlord deems necessary to remove such lien or encumbrance, without being responsible to investigate its validity. All amounts so paid and Landlord's costs, including attorneys' fees, shall be deemed additional rent under this Lease and be payable in full upon demand. Tenant shall not be required to remove any alterations or additions made by Tenant pursuant to this paragraph unless removal is made a condition of Landlord's approval. 16 19. Compliance with ADA. Notwithstanding anything to the contrary contained ------------------- in this Lease, Landlord and Tenant agree that responsibility for compliance with the Americans With Disabilities Act of 1990 (the "ADA") shall be allocated as follows: (i) Landlord shall be responsible for compliance with the provisions of Title III of the ADA for all Common Areas, including exterior and interior areas of the Building not included within the Premises or the premises of other tenants; (ii) Landlord shall be responsible for compliance with the provisions of Title III of the ADA for any construction, renovations, alterations and repairs made within the Premises if such construction, renovations, alterations or repairs are made by Landlord for the purpose of improving the Building generally or are done as Landlord's Work and the plans and specifications for the Landlord's Work were prepared by Landlord's architect or space planner and were not provided by Tenant's architect or space planner; (iii) Tenant shall be responsible for compliance with the provisions of Title III of the ADA for any construction, renovations, alterations and repairs made within the Premises if such construction, renovations, alterations and repairs are made by Tenant, its employees, agents or contractors, at the direction of Tenant or done pursuant to plans and specifications prepared or provided by Tenant or Tenant's architect or space planner. 20. General Office Use. Paragraph 11 of the Original Lease permits Tenant ------------------- to occupy and use the Premises for general offices and no other purpose whatsoever. "General office use" does not include use as a telephone call center or other use which would increase the level of occupancy of the Premise to more than one person per 170 square feet. 21. Rules and Regulations. Landlord may adopt Building Rules and ------------------------ Regulations and janitorial specifications from time to time which shall be applicable to all tenants in the Building to the extent of any inconsistency between the provisions of this Lease and the provisions of such Rules and Regulations, this Lease shall control. A copy of the current Rules and Regulations and janitorial specifications is attached to this Lease as Exhibit ------- D. - - 22. Surrender of Premises. Upon the expiration of the Term, or sooner ---------------------- termination of the Lease, Tenant shall quit and surrender to Landlord the Premises, broom clean, in good order and condition, normal wear and tear and damage by fire and other casualty excepted. All leasehold improvements and other fixtures, such as light fixtures and HVAC equipment, wall coverings, carpeting and drapes, in or serving the Premises, whether installed by Tenant or Landlord, shall be Landlord's property and shall remain, all without compensation, allowance or credit to Tenant. Any property not removed shall be deemed to have been abandoned by Tenant and may be retained or disposed of by Landlord at Tenant's expense free of any and all claims of Tenant, as Landlord shall desire. All property not removed from the Premises by Tenant may be handled or stored by Landlord at Tenant's expense and Landlord shall not be liable for the value, preservation, or safekeeping thereof. At Landlord's option all or part of such property may be conclusively deemed to have been conveyed by Tenant to Landlord as if by bill of sale without payment by Landlord. The Tenant hereby waives to the maximum extent allowable the benefit of all laws now or hereafter in force in this state or elsewhere exempting property from liability for rent or for debt. Tenant's Liebert air cooling unit presently located on the Premises shall 17 be deemed to be equipment owned by Tenant, and not a leasehold improvement or fixture. Tenant shall, upon the termination of the Lease with respect to that portion of the Premises where such Liebert unit is located remove such Liebert unit and repair any damage to the Premises caused by such removal. 23. Cooperation Regarding Operation of HVAC System. Paragraph 11(k) of the ---------------------------------------------- Original Lease is revised to read in its entirety as follows: Tenant shall cooperate in all reasonable ways with Landlord to assure the effective operation of the Building's heating, ventilating, and air-conditioning system. Such cooperation shall include closing of window coverings during the cooling season; not covering registers or returns; not making substantial changes in the location of electrical equipment, lights, and other heat generators compared to the plans; not accessing or changing thermostat settings without input from Building management; and not using space heaters or other substantial generators of heat in the Premises 24. Landlord's Obligation to Repair. To the extent any part of the Tenant -------------------------------- Improvements contemplated by this Amendment and paid for with the TI Allowance constitute part of the Building's base utility systems or structural element, Landlord, and not Tenant, shall be obligated to maintain, repair, and replace such items as contemplated by the second sentence of paragraph 12 of the Original Lease. 25. Assignment and Assumption. Parish is the original tenant under the --------------------------- Original Lease (as defined in paragraph 1, above). Parish hereby assigns to Tenant all of Parish's rights and obligations of whatsoever nature under the Original Lease as modified by this Amendment. Tenant hereby assumes all obligations of Parish under the Original Lease and this Amendment and agrees to timely pay and perform all obligations of Parish and Tenant under the Original Lease and this Amendment. Landlord shall not be required to provide to Parish any notices under the Lease, including, without limitation, notice of non-payment or non-performance or any notice of default. 26. Substitute Premises. Paragraph 26 of the Original Lease is deleted. ------------------- 27. Force Majeure. Landlord shall be excused for the period of any delay in ------------- the performance of any obligation hereunder when prevented from so doing by a cause or causes beyond its control ("Force Majeure"), including all labor disputes, civil commotion, war, war-like operations, invasion, rebellion, hostilities, military or usurped power, sabotage, governmental regulations or controls, fire or other casualty, inability to obtain any material, services or financing, or through acts of God. Tenant shall similarly be excused for delay in the performance of any obligation hereunder by reason of Force Majeure; provided: 18 a. Nothing contained in this paragraph or elsewhere in this Lease shall be deemed to excuse or permit any delay in the payment of the Rent, or any delay in the cure of any default which may be cured by the payment of money; and b. No reliance by Tenant upon this paragraph shall limit or restrict in any way Landlord's right of self-help as provided in this Lease. 28. Certifications and Covenants by Tenant. As additional consideration for -------------------------------------- this Amendment, Tenant hereby certifies that: a. The Lease is in full force and effect, unmodified except by this Amendment, and binding on Tenant. Tenant ratifies the Lease. b. There are no uncured defaults on the part of Landlord or Tenant under the Lease. c. There are no existing offsets or defenses which Tenant has against the enforcement of the Lease by Landlord. 29. Authority. Each of Landlord and Tenant, and each person signing for --------- them, hereby warrants and represents to the other that the individual signing on behalf of that party is fully authorized to sign on behalf of, and to bind, such party and that, when signed by the parties, this Amendment shall be fully binding on the party on whose behalf this Amendment is executed by such individual. 30. Exhibits. The parties acknowledge and agree that each of the Exhibits -------- attached to this Agreement form an integral part of this Agreement and by this reference are incorporated herein as if set forth in full verbatim. Exhibit A: Suite 420 Exhibit B: Operating Expense Exclusions Exhibit C: ASHRAE Standards Exhibit D: Rules and Regulations and Janitorial Standards 31. Execution by Facsimile and Counterparts. This Amendment may be executed --------------------------------------- in one or more counterparts, all of which shall, taken together, constitute one and the same agreement. The parties intend that delivery of this Amendment may be effected by facsimile transmission and that a facsimile copy which has been executed by the transmitting party shall constitute an original. 19 32. Notice Addresses. Addresses for notice to Landlord and Tenant under the ---------------- Lease shall be as follows: Landlord: Massachusetts Mutual Life Insurance Company c/o Cornerstone Real Estate Advisers, Inc. 10866 Wilshire Boulevard Suite 800 Los Angeles, CA 90024 Attn: Asset Manager - Denver Financial Center with a copy to: Transwestern Commercial Services 1775 Sherman Street, Lobby Level Denver, CO 80203 Tenant: St. Mary Land & Exploration Company 1776 Lincoln Street, Suite 700* Denver, CO 80203 Attn: Vice President - Administration with copy to: St. Mary Land & Exploration Company 1776 Lincoln Street, Suite 700 Denver, CO 80203 Attn: General Counsel *Suite 1100 prior to delivery of 7th Floor to Tenant 33. Entire Agreement. This Amendment, together with the Exhibits attached ---------------- hereto, constitutes the entire agreement of the parties and supersedes all prior understandings and agreements with respect to the subject matter hereof. 20 34. No Amendments. No change, modification, or addition of this Amendment ------------- shall be enforceable unless it is in writing and signed by the party against whom enforcement is sought. LANDLORD: TENANT: - -------- ------ MASSACHUSETTS MUTUAL LIFE ST. MARY LAND & EXPLORATION INSURANCE COMPANY COMPANY, a Delaware corporation By: CORNERSTONE REAL ESTATE ADVISERS, INC., its agent By: /s/ MARK A. HELLERTEIN ------------------------------ Name Typed: Mark A. Hellerstien By: /s/ ROBERT K. GIFFIN Title: President ------------------------------- Date: 12/14/01 Name Typed: Robert K. Giffin ---------------------------- Title: Vice President Date: 12/17/01 ------------------------------ 21