Document:

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                                                                    Exhibit 10.1

                                 LEASE AGREEMENT

                             FOR PREMISES LOCATED AT

                                2600 TRADE CENTRE

                               LONGMONT, COLORADO

                                     BETWEEN

                              ARRAY BIOPHARMA, INC.

                             A DELAWARE CORPORATION

                                    AS TENANT

                                       AND

                      PRATT LAND LIMITED LIABILITY COMPANY

                      A COLORADO LIMITED LIABILITY COMPANY

                                   AS LANDLORD

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                                TABLE OF CONTENTS

                                      LEASE

1.   PREMISES LEASED; DESCRIPTION

2.   COMPLETION

3.   TERM
     3.1      Initial Term

     3.2      Occupancy Prior to Commencement Date
     3.4      Delivery of Possession

4.   RENT
     4.1      Base Rental
     4.2      Escalation of Base Rental

     4.3      Maintenance Expense for Grounds, Snow Removal, Exterior and  HVAC
     4.4      Private Security Service
     4.5      Late Charges
     4.6      Security Deposit
     4.7      Proration of Rent for Partial Months

5.   TAXES - REAL PROPERTY - PAID BY TENANT - PROTEST

6.   TAXES - TENANT'S PERSONAL PROPERTY - PAID BY TENANT

7.   UTILITIES - TENANT TO OBTAIN AND PAY FOR

8.   HOLDING OVER

9.   MODIFICATIONS OR EXTENSIONS

10.  ALTERATION - CHANGES AND ADDITIONS - RESPONSIBILITY - NO HOLES IN ROOF -
     NO NEW EQUIPMENT ON ROOF

11.  MECHANIC'S LIENS

12.  UNIFORM SIGNS; NO "FOR RENT" SIGNS

13.  MAINTENANCE AND REPAIRS OF THE BUILDING; LANDLORD NOT LIABLE
     FOR DAMAGE TO CONTENTS

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14.  CONDITION UPON SURRENDER - RETURN OF KEYS

15.  CARE OF GROUNDS; STORAGE OUTSIDE THE BUILDING; NO WASTE, NO
     NUISANCE; COMPLIANCE WITH LAWS; FUTURE RULES AND REGULATIONS

16.  LIABILITY FOR OVERLOAD

17.  NO USE OF PREMISES IN VIOLATION OF INSURANCE POLICIES

18.  INSURANCE
     18.1     All Risk Insurance
     18.2     General Liability Insurance
     18.3     Tenant Improvements
     18.4     Other Insurance
     18.5     Waiver of Subrogation
     18.6     Other Provisions Regarding Tenant's Insurance
     18.7     Changes in Standard Policies

19.  FIRE REGULATIONS - TENANT RESPONSIBILITY

20.  REPLACEMENT OF BUILDING - CASUALTY DAMAGE

21.  ENVIRONMENTAL MATTERS
     21.1     Definitions
     21.1.1   Hazardous Material
     21.1.2   Environmental Requirements
     21.1.3   Environmental Damages

     21.2     Tenant's Obligation to Indemnify, Defend and Hold Harmless
     21.3     Tenant's Obligation to Remediate
     21.4     Notification
     21.5     Negative Covenants
     21.5.1   No Hazardous Material on Premises
     21.5.2   No Violations of Environmental Requirements
     21.5.3   No Environmental or Other Liens
     21.6     Landlord's Right to Inspect and to Audit Tenant's Records
     21.7     Landlord's Right to Remediate
     21.8     Landlord's Obligation to Remediate
     21.9     Landlord's Obligation to Indemnify, Defend and Hold Harmless
              Concerning Environmental Matters
     21.10    Survival of Environmental Obligations

22.  ENTRY BY LANDLORD

23.  DEFAULT - REMEDIES BY LANDLORD

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     23.1     Default Defined
     23.2     Landlord's Remedies in the Event of Default
     23.3     Tenant to Surrender Peaceably
     23.4     No Termination by Re-Entry
     23.5     Injunction
     23.6     Remedies Listed are Cumulative and Non-Exclusive
     23.7     Interest on Sums Past Due
     23.8     Attorneys' Fees
     23.9     Time to Cure Certain Non-Monetary Defaults
     23.10    Landlord Default

24.  LEGAL PROCEEDINGS AGAINST TENANT BY THIRD PARTIES;
     TENANT TO PAY LANDLORD'S FEES

25.  INDEMNIFICATION BY TENANT AND BY LANDLORD

26.  ASSIGNMENT OR SUBLETTING

27.  LANDLORD'S WARRANTY OF TITLE; QUIET ENJOYMENT

28.  ADDITIONAL DEVELOPMENT OF PROPERTY - RIGHTS OF LANDLORD

29.  GOVERNMENTAL ACQUISITION OF THE PREMISES

30.  Number (30) intentionally not used

31.  SUBORDINATION OF THE LEASEHOLD TO MORTGAGES

32.  TENANT'S  FINANCIAL STATEMENTS

33.  MEMORANDUM OF LEASE - RECORDING

34.  NO WAIVER OF BREACH; ACCEPTANCE OF PARTIAL  PAYMENTS OF RENT

35.  CONTROLLING LAW

36.  INUREMENTS

37.  TIME

38.  ADDRESSES; EMPLOYER IDENTIFICATION NUMBERS; METHOD OF GIVING NOTICE

39.  PARAGRAPH HEADINGS; GRAMMAR

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40.  FLEXIBILITY CLAUSE

41.  EXPANSION OPTION

42.  ADDITIONAL PROVISIONS

EXHIBIT A:    Site Plan

EXHIBIT C:    Subordination, Non Disturbance and Attornment Agreement - Example

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                                      LEASE

         THIS LEASE, made and entered into this 11th day of February, 2002 by
and between PRATT LAND LIMITED LIABILITY COMPANY, a Colorado limited liability
company, hereinafter referred to as "Landlord," and ARRAY BIOPHARMA, INC., A
Delaware Corporation, hereinafter referred to as "Tenant."

                              W I T N E S S E T H:

         In consideration of the covenants, terms, conditions, agreements, and
payments as hereinafter set forth, the parties hereto covenant and agree as
follows:

         1. PREMISES LEASED; DESCRIPTION. Landlord hereby leases unto Tenant the
following described Premises deemed to be 28,800 square feet of building floor
space measured to the outside of the walls, including overhangs, canopies and
loading docks, and to approximately 1/2 the thickness of common walls; commonly
known as 2600 Trade Centre Avenue, in the City of Longmont, County of Boulder,
State of Colorado, a more detailed description of which is a portion of Lot 1,
St. Vrain Centre, parcel F, Minor Subdivision B, County of Boulder, State of
Colorado, a diagram of which is attached as Exhibit A (hereinafter referred to
as the "Premises"); the leasing of which is made according to the terms of this
Agreement; together with all appurtenances thereto, and all fixtures attached
thereto, to be constructed, and together with nonexclusive reasonable access
across any other land owned by Landlord as may be required for use of the
Premises by Tenant, with such access to be on such roadways, sidewalks, and
other common areas of which the Premises are a part, or of any such adjacent
lands owned by Landlord, as Landlord may from time to time designate.

         2. COMPLETION. No representation, statement, or warranty, express or
implied, has been made by or on behalf of Landlord as to the condition of the
Premises, or as to the use that may be made of same. In no event shall Landlord
be liable for any defect in the Premises or for any limitation on the use of the
Premises. Landlord covenants to the best of Landlord's knowledge, that on the
Commencement Date the Premises comply with all Federal, State, County, and
Municipal ordinances pursuant to paragraph 15 of this lease agreement.

         3. TERM.

                  3.1 INITIAL TERM. The term of this lease shall commence at
12:00 midnight on April 15, 2002 (the "Commencement Date"), and unless
terminated as herein provided for, shall end at 12:00 midnight on the 31st day
of March 2008.

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                  3.2 OPTION TO EXTEND. Upon full and complete performance of
all the terms, covenants, and conditions herein contained by Tenant and payment
of all rental due under the terms hereof, Tenant shall be given the option to
renew this Lease for two (2) additional terms of forty eight months (48) months
each and one (1) additional term of sixty months (60) months at the then
prevailing rental rate, terms conditions, allowances and concessions of other
comparable properties in south Longmont area; provided that the rental rate
shall not be impacted, or otherwise increased as a result of any Tenant
improvements to the Premises. Each such option shall be exercisable only by
delivery of Tenant's written notice of extension to Landlord not less than 180
days prior to the expiration of the then-existing Lease term. If the Landlord
does not receive the notice from the Tenant to exercise the option in advance of
the 180 days prior to expiration, Landlord will give final notice to Tenant of
expiration of option, and Tenant shall have 15 days from the final notice to
exercise the option. In the event of such exercise, this Lease shall be deemed
to be extended for the additional period pursuant to all the terms and
conditions set forth herein, including (but not as a limitation) those
provisions for increase of the base rental set forth in Paragraph 4.2. In the
event of exercise of said Option, any funds held by Landlord pursuant hereto
shall continue to be so held subject to the terms and conditions relating to
same. In addition, the Tenant shall have the right to exercise its option rights
on approximately one half of the building (14,400 square feet,) providing that
the one half that the Tenant does not exercise its option is a rentable space.
The space shall be rentable when it has been demised by a floor to roof deck,
demising wall, Pratt standard rest room core and phone and data cabling,
independent wiring to sub panels and disconnect and HVAC distribution, front and
rear door access.

                  3.3 DELIVERY OF POSSESSION. Tenant shall take possession of
the Premises at midnight on the Commencement Date, as defined in Paragraph 3.1.
Both parties acknowledge that the Premises are presently leased to Texas
Instruments, Inc. and that Texas Instruments, Inc. will be vacating the
Premises. In the event the Landlord is unable to deliver possession of the
Premises on April 15, 2002, then the Landlord shall be responsible for
liquidated damages of $1,000 per diem for each day of delay. If Landlord does
not deliver possession of the Premises to Tenant on or before the 1st day of
May, 2002, Tenant may, in its sole discretion, elect to terminate this Lease
without further liability hereunder.

         4. RENT. Tenant shall pay to Landlord, at the address of Landlord as
herein set forth, the following as rental for the Premises:

                  4.1 BASE RENTAL. The minimum Base Rental for the full term
hereof shall be $1,788,807.56 payable in monthly installments of $25,018.29 in
advance on the first day of each month during the term hereof.

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                  4.2 ESCALATION OF BASE RENTAL.

                           4.2.1 On the first anniversary of the commencement
date of this lease, and annually thereafter, the base rental payable by Tenant
shall be increased to an amount determined by multiplying the basic monthly
rental by a fraction, the denominator of which shall be the most recent Consumer
Price Index figure, as hereinafter defined, published prior to the Commencement
Date, and the numerator of which shall be the most recent Consumer Price Index
figure published prior to the particular anniversary date; provided, however,
that in no event shall the rent for any month after such anniversary be less
than the rent for the month immediately preceding such anniversary. As used
herein, the term "Consumer Price Index" shall mean the Consumer Price Index, All
Urban Consumers, All Items, Denver, Colorado (1982-84 = 100), or the successor
of that Index, as published by the Bureau of Labor Statistics, U.S. Department
of Labor. Should Landlord lack sufficient data to make the proper determination
on the date of any adjustment, Tenant shall continue to pay the monthly rent
payable immediately prior to the adjustment date. As soon as Landlord obtains
the necessary data, Landlord shall determine the rent payable from and after
such adjustment date and shall notify Tenant of the adjustment in writing.
Should the monthly rent for the period following the adjustment date exceed the
amount previously paid by Tenant for that period, Tenant shall forthwith pay the
difference to Landlord. Should the Consumer Price Index as above described cease
to be published, a reasonably comparable successor index shall be selected by
Landlord. If Tenant objects to the successor index, the dispute will be resolved
and a successor index designated by arbitration pursuant to the rules and
procedures of the American Arbitration Association.

                           4.2.2 Notwithstanding the foregoing, the parties
agree that the increase in base rental for each year shall be not less than two
percent (2%) nor more than seven percent (7%) of the base rental for the
previous year, each year for such purposes to commence on the anniversary of the
Commencement Date. Notwithstanding the foregoing, during any of the option
terms, the increase in base rental for each year shall be not less than three
percent (3%) nor more than ten percent (10%) of the base rental for the previous
year, each year for such purposes to commence on the anniversary of the
Commencement Date.

                           4.2.3 Landlord may in its sole discretion, waive the
escalation provided for in Paragraph 4.2.1 or Paragraph 4.2.2 for any particular
year, years, or part of a year. No such waiver shall preclude Landlord from
applying the escalation to any subsequent year or part of a year, and from
making the subsequent application as if all subsequent escalations had been duly
made to the maximum permissible extent.

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                  4.3 MAINTENANCE EXPENSE FOR GROUNDS, SNOW REMOVAL, EXTERIOR
AND HVAC. Tenant shall pay the cost incurred by Landlord in order to maintain
the HVAC systems and the exterior of the Premises including parking lots, green
areas, sidewalks, entrances, and corridors (but not the exterior surfaces of the
building, other than glass). Cost of maintaining such areas shall include, but
shall not be limited to, repairs, preventative maintenance, HVAC filters and
compressors, sealing, striping, lawn mowing, snow removal (Tenant is responsible
for snow removal of less than 2"), gardening, shrub care and replacements, lawn
watering, parking area maintenance, electricity for lighting, sign maintenance,
and other direct costs related to the Premises or common areas. Landlord shall
perform such maintenance and charge the cost thereof to Tenant, which shall be
paid as additional rent within 10 days after delivery of Landlord's invoice.
Landlord shall keep reasonable and accurate records of such cost, which shall be
available for Tenant's inspection during normal business hours. Certain items of
such maintenance (such as landscape maintenance and snow removal) are performed
by Landlord on numerous areas owned and/or maintained by Landlord, in addition
to the Premises, and the cost thereof cannot be precisely ascribed to the
Premises. As to such services which are performed on areas in addition to the
Premises, the cost for all areas so serviced shall be allocated to the Premises
in proportion to the square feet of building floor space in the Premises
compared to the square feet of building floor space in the entire area to which
such services are provided.

                  For the first year of the lease, Landlord agrees that the
total of the maintenance fees referred to in this paragraph will not exceed
$1.03 per square foot annually.

                  4.4 PRIVATE SECURITY SERVICE. Landlord may, in its sole
discretion, engage a private security service, Landlord will notify Tenant of
this action, as an independent contractor, to patrol an area which includes the
Premises. If Landlord does so employ a private security service, the cost
thereof shall be treated in the same manner as Maintenance Expense and paid by
Tenant as Additional Rent under the same provisions as are applicable to
Maintenance Expense.

                  Landlord shall have absolutely no obligation to engage a
private security service and shall not be liable for any damages or loss which
might have been averted had a private security service been engaged. If Landlord
does engage a private security service, Landlord shall not be liable for any
damages or loss which may result from actions, inactions, non-performance or
quality of performance by the security service. If the Tenant desires a higher
level of security services than Landlord provides, or wishes to obtain an
agreement that there will be liability for actions, inactions, non-performance
or quality of performance by a security service, Tenant may itself engage such
security service as Tenant chooses, at Tenant's sole expense.

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                  Nothing herein shall limit any action by Tenant against any
person or entity providing private security service, provided that Landlord
shall not be party to, or liable for any judgment entered in such an action, as
a defendant, cross defendant, third-party defendant, or otherwise.

                  4.5 LATE CHARGES. If any monthly rental payment is more than
five days late the Tenant will pay a late charge equal to five percent of any
such late monthly rental payment or other payment not paid when due, which
payment shall be in addition to any interest elsewhere provided for.

                  4.6 SECURITY DEPOSIT. Landlord acknowledges receipt of a
Commercial Standby Letter of Credit dated on the execution date hereof and for a
period co-terminus with the lease and in the amount of Fifty Four Thousand Four
Hundred Thirty Two and no/100ths U.S. Dollars ($54,432.00) to be retained by
Landlord as security for the performance of all of the terms and conditions of
this lease Agreement to be performed by Tenant, including payment of all rental
due under the terms hereof. At Landlord's election, drafts may be made by
Landlord from the amount so retained for the reasonable cost of repairs to the
Premises which should have been performed by Tenant, for any rental payment or
other sum delinquent under the terms hereof, and for any sum used by Landlord in
any manner to cure any default in the performance of Tenant under the terms of
this lease. In the event drafts are so made, thereby reducing the amount of the
Standby Letter of Credit, during the rental term, upon notice by Landlord,
Tenant's bank shall reinstate such amounts so expended so as to maintain the
original amount of the Commercial Standby Letter of Credit security deposit in
the amount as herein provided for, within 10 days after receipt of such written
demand from Landlord. Nothing herein contained shall limit the liability of
Tenant as to any repairs or maintenance of the Premises; and nothing herein
shall limit the obligation of Tenant promptly to pay all sums otherwise due
under this lease and to comply with all the terms and conditions hereof.

                  4.7 PRORATION OF RENT FOR PARTIAL MONTHS. If the lease term
begins on other than the first day of a month, base rent and additional rent
from such date until the first day of the next succeeding calendar month shall
be prorated on the basis of the actual number of days in such calendar month and
shall be payable in advance. If the lease term terminates on other than the last
day of the calendar month, rent from the first day of such calendar month until
such termination date shall be prorated on the basis of the actual number of
days in such month, and shall be payable in advance.

         5. TAXES - REAL PROPERTY - PAID BY TENANT - PROTEST. Tenant shall pay
as additional rent, all real estate taxes and assessments, as shall, from and
after the date hereof, be assessed upon the Premises and any appurtenances or
improvements thereto. Tenant shall pay one-twelfth (1/12) of such estimated
taxes and assessments as additional rent, in advance, with each monthly rental

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payment. Landlord shall reasonably estimate such taxes and advise Tenant in
writing of the amount to be paid each month. Such payments shall be separately
accounted for by Landlord, (and may be deposited with any holder of a mortgage
or deed of trust on the Premises) and shall be used to make prompt payment of
such taxes as they come due. If the estimated payments made by Tenant are not
sufficient to fully pay such taxes as they come due, Tenant shall pay to
Landlord any amount necessary to make up the deficiency within ten (10) days of
notice from Landlord. Landlord shall have no obligation to pay any interest to
Tenant on such additional rent, but Landlord shall give Tenant an annual
accounting showing credit for such payments made by Tenant, and debits for
payments made by Landlord or Landlord's lender. If Tenant fails to make any
required payment to Landlord, Landlord may, but shall not be required to, pay
any such tax and shall become entitled to repayment from Tenant upon demand,
together with interest thereon as elsewhere provided. The real estate taxes and
assessments for the year in which the term of this lease shall begin, as well as
for the year in which the lease shall end, shall be apportioned so that Tenant
shall pay only the portions that correspond with the portions of such years as
are within such lease term. In the event that the Premises are assessed for tax
purposes as a part of a larger parcel, the tax on the entire parcel shall be
prorated in proportion to the number of square feet of building floor space on
each portion of the entire parcel.

         Upon written request from Tenant, whose request shall not be
unreasonably denied, Landlord shall protest the tax assessment on the Premises,
to the extent that Landlord, in good faith, believes that such protest is
justifiable and likely to be successful. In the event of any such protest Tenant
shall nevertheless pay to Landlord the taxes as assessed, and Tenant shall be
entitled to the appropriate share of any refund. Tenant shall not protest any
real property tax assessment on the Premises.

         6. TAXES - TENANT'S PERSONAL PROPERTY - PAID BY TENANT. Tenant shall be
responsible for and timely pay any and all personal property taxes assessed
against any furniture, fixtures, equipment and items of a similar nature
installed and/or located in or about the Premises by Tenant.

         7. UTILITIES - TENANT TO OBTAIN AND PAY FOR. As of the Commencement
Date Landlord shall assure that all appropriate utilities are available at the
Premises including water, hot water, heat, gas, electricity, light, telephone,
and power, provided that Landlord shall not be required to furnish Tenant any
such utility services. Tenant shall obtain and pay all charges for gas,
electricity, light, heat, power, water (and lawn watering), and telephone, cable
TV or other communication services or other utilities used, rendered, or
supplied, upon or in connection with the Premises. Tenant irrevocably appoints
Landlord as Tenant's attorney-in-fact solely for the purpose of terminating
Tenant's account with any provider of such utilities, if the Premises are
abandoned by Tenant or if the lease is terminated.

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         8. HOLDING OVER. If, after expiration of the term of this lease, Tenant
shall remain in possession of the Premises and continue to pay rent without a
written agreement as to such possession, and the two parties are not working in
good faith to negotiate a new lease, then Tenant shall be deemed a
month-to-month Tenant and the rental rate during such holdover tenancy shall be
equivalent to one and one-quarter times the monthly rental paid for the last
month of tenancy under this lease. Landlord to provide thirty (30) days notice
to invoke an increase in the monthly base rent. This notice can be in the form
of an invoice. The Landlord may terminate such month-to-month tenancy at noon on
any day which is more than twenty-nine (29) days after date of delivery of
Landlord's written notice of termination to Tenant.

         9. MODIFICATIONS OR EXTENSIONS. No holding over by Tenant shall operate
to renew or extend this lease without the written consent of Landlord. No
modification of this lease shall be binding unless endorsed hereon or otherwise
written and signed by the respective parties.

         10. ALTERATION - CHANGES AND ADDITIONS - RESPONSIBILITY - NO HOLES IN
ROOF - NO NEW EQUIPMENT ON ROOF. Subject to Landlord's reasonable determination
that any alterations requested by Tenant do not negatively affect the integrity
of the leased Premises in Landlord's reasonable discretion, Tenant may, during
the term of this lease, at Tenant's expense, erect inside partitions, add to
existing electric power service, add telephone outlets or other communication
services, add light fixtures, install additional heating and/or air conditioning
or make such other changes or alterations as Tenant may desire, provided that
prior to commencement of any such work, Tenant shall submit to Landlord a set of
fully detailed working drawings and specifications for the proposed alteration,
prepared by a licensed architect or engineer. It is the understanding of the
Landlord that the Tenant will be making modifications similar in nature to those
modifications made by Tenant in the property located at 2620 Trade Centre,
Longmont, CO. and Landlord hereby approves such similar modifications to the
Premises, however Landlord reserves the right to final approval of construction
documents as provided herein. If Tenant so requests, Landlord will have the
drawings and specifications prepared for Tenant, at Tenant's expense, utilizing
Landlord's in-house staff. Tenant will pay Landlord's customary hourly charges
for such services, as additional rent, to be paid within 10 days after delivery
of invoice. In particular, but not as a limitation, the working drawings must
fully detail changes to mechanical, wiring and electrical, lighting, plumbing
and HVAC systems to Landlord's satisfaction. Landlord may refuse to consent to
the alterations because of the inadequacy of the drawings and specifications.
Tenant may not commence the alterations until Landlord's written consent has
been given. Any additions or alterations performed by Tenant of the
telecommunication or data transmission equipment, facilities, lines or outlets
on the Premises shall be performed only in accordance with the specifications
attached hereto as Exhibit D. Such additions and alterations shall be at
Tenant's expense. At the termination of this lease, Tenant shall be

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responsible for all expenses necessary to return the telecommunication and data
transmission equipment, facilities, lines and outlets on the Premises to their
condition before such additions or alterations were made. If the drawings and
specifications are adequate, to Landlord's reasonable satisfaction, then
Landlord will not unreasonably withhold its consent to the alterations, except
that Landlord may withhold its consent to new or altered openings (holes) in the
roof, or placement of additional equipment on the roof, as follows. Landlord may
withhold its consent to new openings in the roof or placement of additional
equipment on the roof unless Landlord, in its sole reasonable discretion, is
satisfied that the risk of increased leakage or risk of more frequent repairs or
maintenance of the roof is acceptable to Landlord. Any new or altered opening in
the roof, or placement of additional equipment thereon, shall be considered an
alteration, which requires the prior written consent of Landlord. If within
thirty (30) days after such plans and specifications are submitted by Tenant to
Landlord for such approval, Landlord shall have not given Tenant notice of
disapproval, stating the reason for such disapproval, such plans and
specifications shall be considered approved by Landlord. As a condition of
approval for such alternations, Landlord shall have the right to require Tenant
to furnish adequate bond or other security acceptable to Landlord for
performance of and payment for the work to be performed. At the end of this
lease, all such fixtures, additions and/or alterations (except trade fixtures
equipment and other property owned and installed by Tenant shall be and remain
the property of Landlord, provided, however, Landlord shall have the option to
require Tenant to remove any or all such fixtures, equipment, additions, and/or
alterations and restore the Premises to the condition existing immediately prior
to such change and/or installation, normal wear and tear excepted, all at
Tenant's cost and expense. All work done by Tenant shall conform to appropriate
city, county and state building codes and health standards and OSHA standards
and Tenant shall be responsible for obtaining and paying for building permits.

         If any such work done by Tenant causes damage to the structural
portion, exterior finish or roof of the Premises, then the costs of repair of
such damage, and of all further maintenance and repairs to such structural
portion, exterior finish or roof during the term of the lease shall thereafter
be the responsibility of Tenant.

         Neither Landlord's right of entry, nor any actual inspection by
Landlord, nor Landlord's actual knowledge of any alteration accomplished or in
progress shall constitute a waiver of Landlord's rights concerning alterations
by Tenant.

         11. MECHANIC'S LIENS. Tenant shall pay all costs for construction done
by it or caused to be done by it on the Premises as permitted by this lease.
Tenant shall keep the building, other improvements and land of which the
Premises are a part free and clear of all mechanic's liens resulting from
construction by or for Tenant. Tenant shall have the right to contest the
correctness or validity of any such lien if, immediately on demand by Landlord,
Tenant deposits with Landlord and/or any appropriate court or title insurance
company a bond or sum of money sufficient to allow

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issuance of title insurance against the lien and/or to comply with the statutory
requirements for discharge of the lien found in Sections 38-22-130 and 131,
Colorado Revised Statutes, or any successor statutory provision. Landlord shall
have the right to require Tenant's contractor(s), subcontractors and materialmen
to furnish to both Tenant and Landlord adequate lien waivers on work or
materials paid for, in connection with all periodic or final payments, by
endorsement on checks, making of joint checks, or otherwise, and Landlord shall
have the right to review invoices prior to payment. Landlord reserves the right
to post notices on the Premises that Landlord is not responsible for payment of
work performed and that Landlord's interest is not subject to any lien.

         12. UNIFORM SIGNS; NO "FOR RENT" SIGNS. It is Landlord's intent to
maintain uniformity of signs throughout the area where signs may be controlled
by Landlord. Tenant shall place no signs on the Premises (except inside Tenant's
portion of the building on the Premises) without prior written consent of
Landlord, which consent shall not be unreasonably withheld. All shall be
consistent with similar properties that Landlord owns and shall comply with
municipal sign codes.

         Tenant may not put any signs on the Premises indicating that the same
are for rent, or available for assignment or sublease, and may put no signs of
real estate brokers on the Premises.

         13. MAINTENANCE AND REPAIRS OF THE BUILDING; LANDLORD NOT LIABLE FOR
DAMAGE TO CONTENTS. Landlord shall be responsible for maintenance and repairs of
the structural portions, the roof and the exterior finish of the building (other
than glass) on the Premises at the sole cost and expense of Landlord; provided,
however, that if any such maintenance or repairs are necessitated by the acts of
Tenant or its employees, agents, contractors, sub-contractors, licensees,
invitees or guests, Tenant shall reimburse Landlord for the cost of same, as
additional rent, to be paid within 10 days after delivery of invoice except to
the extent that such maintenance or repairs are covered by the insurance
described in Section 18.1.. All other maintenance, repairs and replacements
shall be performed by Tenant, at its own expense, including all necessary
maintenance, repairs and replacements to pipes, plumbing systems, electrical
systems, window or other glass, doors, fixtures, interior decorations, and all
other appliances and appurtenances. Landlord warrants that the plumbing and
electrical systems are in good working order upon the Commencement Date of this
lease. Such repairs and replacements, interior and exterior, ordinary as well as
extraordinary, shall be made promptly, as and when necessary. All such
maintenance, repairs and replacements shall be in quality and class at least
equal to the original work. On default of Tenant in making such maintenance,
repairs or replacements, Landlord may, but shall not be required to, make such
repairs and replacements for Tenant's account, and the expense shall constitute
and be collectable as additional rent, together with interest thereon as
hereinafter provided.

                                                                               9
<PAGE>

         Notwithstanding the Landlord's obligations elsewhere set forth in this
lease, except in the case of Landlord's gross negligence or intentional
misconduct, under no circumstances shall Landlord be liable for damage to the
contents of the building or consequential damages to Tenant resulting from roof
or window leaks or failure, or leakage of any water pipe or gas pipe, failure of
any communications system or alarm, failure or leakage or discharge by any
sprinkler system or other fire suppression system, power surges, power shortages
or outage, sewer failure or sewage backup, or failure or malfunction of any
heating or cooling system. The term "contents" shall include, but shall not be
limited to, improvements made by Tenant, and data bases and other information
stored or contained in computers, hard or floppy disks, tapes, computer chips
and other memory or storage devices. The term "consequential damages" shall
include, but not be limited to, Tenant's inability to perform any contract on
which Tenant is bound, loss of sales, loss of profit, or loss of business
reputation or goodwill.

         14. CONDITION UPON SURRENDER - RETURN OF KEYS. Tenant shall vacate the
Premises in the same condition as when received, ordinary wear and tear
excepted, and shall remove all of Tenant's property, so that Landlord can
repossess the Premises not later than noon on the day upon which this lease or
any extension hereof ends, whether upon notice, holdover or otherwise. The
Landlord shall have the same rights to enforce this covenant by ejectment and
for damages or otherwise as for the breach of any other conditions or covenant
of this lease. Upon termination of the lease, Tenant shall deliver to Landlord
keys which operate all locks on the exterior or interior of the Premises,
including, without limitation, keys to locks on cupboards and closets. Tenant
shall retrieve all keys to the Premises which Tenant has delivered to employees
or others, and include same with the keys delivered to Landlord.

         15. CARE OF GROUNDS; STORAGE OUTSIDE THE BUILDING; NO WASTE; NO
NUISANCE; COMPLIANCE WITH LAWS; FUTURE RULES AND REGULATIONS. Tenant shall use
the Premises for medicinal, combinatorial, and process chemistry research and
development, and manufacture, and other research and development, sales office,
engineering, and light manufacturing, and other uses appurtenant thereto, and
occupancy is limited to 128 employees. Except as otherwise provided herein,
Tenant will maintain the grounds which are part of the Premises, keeping them
free from accumulation of trash or debris and will be responsible for snow
removal up to two inches of snow. Tenant shall conform to all present and future
laws and ordinances of any governmental authority having jurisdiction over the
Premises, and will make no use in violation of same. No outside storage shall be
allowed unless first approved by Landlord in writing and then only in such areas
as are designated as storage areas by Landlord. Tenant shall not commit or
suffer any waste on the Premises. Tenant shall not permit any nuisance to be
maintained on the Premises nor permit any disorderly conduct, noise or other
activity having a tendency to annoy or to

                                                                              10
<PAGE>

disturb occupants of any other part of the property of which the Premises are a
part and/or of any adjoining property.

         As part of a common scheme for orderly development, use and protection,
of its various properties and those properties adjacent to the Premises,
Landlord may impose upon Tenant reasonable rules and regulations concerning
parking and vehicle traffic; locations at which deliveries are to be made and
access thereto; trash disposal; use of common areas such as recreation areas,
corridors, and sidewalks; signs and directories; use of communication wires or
cables which are used in common but which may be inadequate fully to serve all
the demands placed upon them; provided that such rules and regulations shall be
uniform in their application and shall not violate the express terms of this
lease elsewhere set forth.

         16. LIABILITY FOR OVERLOAD. Tenant shall be liable for the cost of any
damage to the Premises or the building or the sidewalks and pavements adjoining
the same which results from the movement of heavy articles or heavy vehicles or
utility cuts made by or on behalf of Tenant. Tenant shall not overload the
floors or any other part of the Premises.

         17. NO USE OF PREMISES IN VIOLATION OF INSURANCE POLICIES. Tenant shall
make no use of the Premises which would void or make voidable any insurance upon
the Premises.

         18. INSURANCE.

                  18.1 ALL RISK INSURANCE. Landlord shall keep the building and
improvements insured throughout the term of this lease against losses covered by
an "All Risk" policy, as defined in the insurance industry, which shall also
cover 1) loss of rental and 2) deposit of Hazardous Materials on the Premises by
those acts of third parties which constitute vandalism. The deductible amount
shall not exceed $10,000. Landlord shall pay any premium on such policy and
Tenant shall reimburse Landlord for one hundred percent (100%) of the insurance
premium paid by Landlord. Such insurance premiums owed by Tenant shall be
considered additional rent and shall be due within ten (10) days after Landlord
has delivered an invoice for the same. Landlord may purchase a single policy
covering buildings and grounds in addition to the Premises. In that event, the
premium shall be allocated among the various covered buildings and the Premises
in proportion to the number of square feet of building floor space in each area.

                  18.2 GENERAL LIABILITY INSURANCE. Tenant agrees to carry
comprehensive general liability insurance in the minimum total amount of ONE
MILLION Dollars ($1,000,000.00) for each occurrence of bodily injury and ONE
MILLION Dollars ($1,000,000.00) for each occurrence of property damage. Tenant
shall supply to Landlord certificates of insurance as provided in Paragraph
18.6. In the event

                                                                              11
<PAGE>

Tenant fails to secure such insurance or to give evidence to Landlord of such
insurance by depositing with Landlord certificates as provided below, Landlord
may purchase such insurance in Tenant's name and charge Tenant the premiums
therefor. Bills for the premiums therefor shall be deemed and paid as additional
rent due within 10 days after delivery of invoice. The Landlord shall be an
additional named insured on the policy.

                  18.3 TENANT IMPROVEMENTS. Tenant agrees to carry insurance
covering all of Tenant's leasehold improvements, alterations, additions or
improvements, trade fixtures, merchandise and personal property from time to
time in, on or upon the Premises, in an amount not less than one hundred percent
(100%) of the full replacement cost of such items from time to time during the
term of this lease, providing protection against any peril included within an
"All-Risk" policy, with a deductible amount not to exceed $20,000. Any policy
proceeds shall be used for the repair or replacement of the property damaged or
destroyed unless this lease shall cease and terminate due to destruction of the
Premises as provided below.

                  18.4 OTHER INSURANCE. Tenant agrees to carry insurance against
such other hazards and in such amounts in accordance with standard and
commercially accepted business practices as the holder of any mortgage or deed
of trust to which the lease is subordinate may reasonably require from time to
time.

                  18.5 WAIVER OF SUBROGATION. Landlord and Tenant grant to each
other on behalf of any insurer providing fire and extended insurance coverage to
either of them covering the Premises, improvements thereon, and contents
thereof, a waiver of any right of subrogation or recovery of any payments of
loss under such insurance, such waiver to be effective so long as each is
empowered to grant such waiver under the terms of its insurance policy, and to
give all necessary notice of such waiver to its insurance carriers.

                  18.6 OTHER PROVISIONS REGARDING TENANT'S INSURANCE. All
insurance required of Tenant in this lease shall be effected under enforceable
policies issued by insurers of recognized good financial condition licensed to
do business in this State. At least fifteen (15) days prior to the expiration
date of any such policy, a certificate evidencing a new or renewal policy shall
be delivered by Tenant to Landlord. Within fifteen (15) days after the premium
on any policy shall become due and payable, Landlord shall be furnished with
satisfactory evidence of its payment. To the extent obtainable, all policies
shall contain an agreement that notwithstanding any act or negligence of Tenant
which might otherwise result in forfeiture of such insurance, such policies
shall not be canceled except upon ten (10) days prior written notice to
Landlord, and that the coverage afforded thereby shall not be affected by the
performance of any work in or about the Premises.

                                                                              12
<PAGE>

         If Tenant provides any insurance required of Tenant by this lease in
the form of a blanket policy, Tenant shall furnish satisfactory proof that such
blanket policy complies in all respects with the provisions of this lease, and
that the coverage thereunder is at least equal to the coverage which would be
provided under a separate policy covering only the Premises.

                  18.7 CHANGES IN STANDARD POLICIES. If the definition of
insurance industry policy language relating to "All-Risk" insurance or other
term changes, the insurance requirements hereunder shall be modified to conform
to the existing insurance industry language; however, the dollar amount of the
coverages required under this lease shall not be less than those existing at the
time of the effective beginning date of this lease.

         19. FIRE REGULATIONS - TENANT RESPONSIBILITY. It shall be Tenant's sole
and exclusive responsibility to meet all fire regulations of any governmental
unit having jurisdiction over the Premises to the extent such regulations affect
Tenant's operations, at Tenant's sole expense.

         20. REPLACEMENT OF BUILDING - CASUALTY DAMAGE. If the Premises are
damaged or destroyed by fire or other cause at any time after the date of
commencement of this lease, Landlord shall proceed with due diligence to repair
or restore the same to the same condition as existed before such damage or
destruction, and as soon as possible thereafter will give possession to the
Tenant of the Premises without diminution or change of location. Provided,
however, that in case of destruction of a material portion of the Premises by
fire, or in case the Premises are damaged so that a material portion of the
Premises is untenantable, then either party shall have the right to terminate
this lease instead of rebuilding the improvements; provided, however, that
either party shall give the other party written notice of its intention to
terminate, said notice to be served not later than thirty (30) days after the
occurrence of the damage to the property. For the purposes of this Section 20 a
"material portion" shall mean at least 30% of the total lab area of the
Premises. In the event the Premises are rendered temporarily untenantable for a
period of less than sixty (60) days because of fire or other casualty, base
monthly rent shall abate on the untenantable area until the Premises are
restored to their former condition, abatement to be based on the square feet of
building floor space in the untenantable area compared to the total square feet
of building floor space on the Premises. Provided, however, that to the extent
the damage or destruction results from the negligence of Tenant or its
employees, agents, contractors, subcontractors, invitees, guests or licensees,
Tenant shall pay for the restoration or repair, to the extent the cost of same
is not covered by insurance.

                                                                              13
<PAGE>

         21. ENVIRONMENTAL MATTERS.

                  21.1 DEFINITIONS.

                           21.1.1 HAZARDOUS MATERIAL. Hazardous Material means
any substance:

                           (a) the presence of which requires investigation,
notice or remediation under any federal, state or local statute, regulation,
ordinance, order, action, policy or common law; or

                           (b) which is or becomes defined as a "hazardous
material," "hazardous waste," "hazardous substance," "regulated substance,"
"pollutant" or "contaminant" under any federal, state or local statute,
regulation, rule or ordinance or amendments thereto including, without
limitation, the Comprehensive Environmental Response, Compensation and Liability
Act (42 U.S.C. Section 9601 et seq.), Toxic Substances Control Act (15 U.S.C.
Section 2601 et seq.), the Colorado Underground Storage Tank Act (Colo. Rev.
Stat. Section 25-18-101 et seq.), and/or the Resource Conservation and Recovery
Act (42 U.S.C. Section 6901 et seq.); or

                           (c) which is toxic, explosive, corrosive, flammable,
infectious, radioactive, carcinogenic, mutagenic, or otherwise hazardous and is
or becomes regulated by any governmental authority, agency, department,
commission, board, agency or instrumentality of the United States, the State of
Colorado or any political subdivision thereof; or

                           (d) the presence of which on the Premises causes or
threatens to cause a nuisance upon the Premises or to adjacent properties or
poses or threatens to pose a hazard to the health or safety of persons on or
about the Premises; or

                           (e) which contains gasoline, diesel fuel or other
petroleum hydrocarbons; or

                           (f) which contains polychlorinated biphenyls (PCBs),
asbestos or urea formaldehyde foam insulation; or

                           (g) radon gas.

                           21.1.2 ENVIRONMENTAL REQUIREMENTS. Environmental
Requirements means all applicable present and future statutes, regulations,
rules, ordinances, codes, licenses, permits, orders, approvals, plans,
authorizations, concessions, franchises, and similar items, of all governmental
agencies, departments, commissions, boards, bureaus, or instrumentalities of the
United States, states and political subdivisions

                                                                              14
<PAGE>

thereof and all applicable judicial, administrative, and regulatory decrees,
judgments, and orders relating to the protection of human health or the
environment, including, without limitation:

                           (a) All requirements, including but not limited to
those pertaining to reporting, licensing, permitting, investigation, and
remediation of emissions, discharges, releases, or threatened releases of
Hazardous Materials, chemical substances, pollutants, contaminants, or hazardous
or toxic substances, materials or wastes whether solid, liquid, or gaseous in
nature, into the air, surface water, groundwater, or land, or relating to the
manufacture, processing, distribution, use, treatment, storage, disposal,
transport, or handling of chemical substances, pollutants, contaminants, or
hazardous or toxic substances, materials, or wastes, whether solid, liquid, or
gaseous in nature; and

                           (b) All requirements pertaining to the protection of
the health and safety of employees or the public.

                           21.1.3 ENVIRONMENTAL DAMAGES. Environmental Damages
means all claims, judgments, damages, losses, penalties, fines, liabilities
(including strict liability), encumbrances, liens, costs, and expenses of
investigation and defense of any claim, whether or not such claim is ultimately
defeated, and of any good faith settlement or judgment, of whatever kind or
nature, contingent or otherwise, matured or unmatured, foreseeable or
unforeseeable, including without limitation reasonable attorneys' fees and
disbursements and consultants' and witnesses' fees, any of which are incurred at
any time as a result of the existence of Hazardous Material upon, about, beneath
the Premises or migrating or threatening to migrate to or from the Premises, or
the existence of a violation of Environmental Requirements pertaining to the
Premises, including without limitation:

                           (a) Damages for personal injury, or injury to
property or natural resources occurring upon or off of the Premises, foreseeable
or unforeseeable, including, without limitation, lost profits, consequential
damages, the cost of demolition and rebuilding of any improvements on real
property, interest and penalties including but not limited to claims brought by
or on behalf of employees of Tenant;

                           (b) Fees incurred for the services of attorneys,
consultants, contractors, experts, laboratories and all other costs incurred in
connection with the investigation or remediation of such Hazardous Materials or
violation of Environmental Requirements including, but not limited to, the
preparation of any feasibility studies or reports or the performance of any
cleanup, remediation, removal, response, abatement, containment, closure,
restoration or monitoring work required by any federal, state or local
governmental agency or political subdivision or court, or reasonably necessary
to make full economic use of the Premises and any other property in a manner
consistent with its current use or otherwise expended in connection with such

                                                                              15
<PAGE>

conditions, and including without limitation any attorneys' fees, costs and
expenses incurred in enforcing this agreement or collecting any sums due
hereunder;

                           (c) Liability to any third person or governmental
agency to indemnify such person or agency for costs expended in connection with
the items referenced herein; and

                           (d) Diminution in the value of the Premises and
adjoining property, and damages for the loss of business and restriction on the
use of or adverse impact on the marketing of rentable or usable space or of any
amenity of the Premises and adjoining property.

                  21.2 TENANT'S OBLIGATION TO INDEMNIFY, DEFEND AND HOLD
HARMLESS. Tenant, its successors, assigns and guarantors, agree to indemnify,
defend, reimburse and hold harmless the following persons from and against any
and all Environmental Damages arising from activities of Tenant or its
employees, agents, contractors, subcontractors, or guests, licensees, or
invitees which (1) result in the presence of Hazardous Materials upon, about or
beneath the Premises or migrating to or from the Premises, or (2) result in the
violation of any Environmental Requirements pertaining to the Premises and the
activities thereon:

                           21.2.1 LANDLORD;

                           21.2.2 any other person who acquires an interest in
the Premises in any manner, including but not limited to purchase at a
foreclosure sale or otherwise; and

                           21.2.3 the directors, officers, shareholders,
employees, partners, agents, contractors, subcontractors, experts, licensees,
affiliates, lessees, mortgagees, trustees, heirs, devisees, successors, assigns,
guests and invitees of such persons.

         This obligation shall include, but not be limited to, the burden and
expense of the indemnified parties in defending all claims, suits and
administrative proceedings, including attorneys' fees and expert witness and
consulting fees, even if such claims, suits or proceedings are groundless, false
or fraudulent (except to the extent such claims, suits or proceedings are
brought by an indemnified party), and conducting all negotiations of any
description, and paying and discharging, when and as the same become due, any
and all judgments, penalties or other sums due against such indemnified persons,
and all such expenses incurred in enforcing the obligation to indemnify. Tenant,
at its sole expense, may employ additional counsel of its choice to associate
with counsel representing the indemnified parties.

                                                                              16
<PAGE>

                  21.3 TENANT'S OBLIGATION TO REMEDIATE. Notwithstanding the
obligation of Tenant to indemnify Landlord pursuant to this agreement, Tenant
shall, upon demand of Landlord, and at its sole cost and expense, promptly take
all actions to remediate the Premises which are reasonably necessary to mitigate
Environmental Damages or to allow full economic use of the Premises, or are
required by Environmental Requirements, which remediation is necessitated by the
1) introduction of a Hazardous Material upon, about or beneath the Premises or
2) a violation of Environmental Requirements, either of which is caused by the
actions of Tenant, its employees, agents, contractors, subcontractors, guests,
invitees or licensees. Such actions shall include, but not be limited to, the
investigation of the environmental condition of the Premises, the preparation of
any feasibility studies, reports or remedial plans, and the performance of any
cleanup, remediation, containment, operation, maintenance, monitoring or
restoration work, whether on or off of the Premises. Tenant shall take all
actions necessary to restore the Premises to the condition existing prior to the
introduction of Hazardous Material upon, about or beneath the Premises by
Tenant, its employees, agents, contractors, subcontractors, guests, or invitees
or licensees, notwithstanding any lesser standard of remediation allowable
under applicable law or governmental policies. All such work shall be performed
by one or more contractors, selected by Tenant and approved in advance and in
writing by Landlord. Tenant shall proceed continuously and diligently with such
investigatory and remedial actions, provided that in all cases such actions
shall be in accordance with all applicable requirements of governmental
entities. Any such actions shall be performed in a good, safe and workmanlike
manner and shall minimize any impact on the business conducted at the Premises.
Tenant shall pay all costs in connection with such investigatory and remedial
activities, including but not limited to all power and utility costs, and any
and all taxes or fees that may be applicable to such activities. Tenant shall
promptly provide to Landlord copies of testing results and reports that are
generated in connection with the above activities, and copies of any
correspondence with any governmental entity related to such activities. Promptly
upon completion of such investigation and remediation, Tenant shall permanently
seal or cap all monitoring wells and test holes to industrial standards in
compliance with applicable federal, state and local laws and regulations, remove
all associated equipment, and restore the Premises to the maximum extent
possible, which shall include, without limitation, the repair of any surface
damage, including paving, caused by such investigation or remediation hereunder.
Provided, however, that Tenant shall not be obligated to remediate environmental
damages which result from seepage of Hazardous Materials onto the Premises from
adjacent property unless the presence on the adjacent property was caused by
Tenant or its employees, agents, contractors, subcontractors, guests, invitees
or licensees. Provided that the Tenant is in compliance, in no event shall
Landlord demand more often than once every twelve (12) months that Tenant pay
for investigation of environmental conditions of the Premises, which shall not
exceed $1,250.00 per investigation.

                                                                              17
<PAGE>

                  21.4 NOTIFICATION. If Tenant shall become aware of or receive
notice or other communication concerning any actual, alleged, suspected or
threatened violation of Environmental Requirements, or liability of Tenant for
Environmental Damages in connection with the Premises or past or present
activities of any person thereon, or that any representation set forth in this
agreement is not or is no longer accurate, including but not limited to notice
or other communication concerning any actual or threatened investigation,
inquiry, lawsuit, claim, citation, directive, summons, proceeding, complaint,
notice, order, writ, or injunction, relating to same, then Tenant shall deliver
to Landlord, within ten days of the receipt of such notice or communication by
Tenant, a written description of said violation, liability, correcting
information, or actual or threatened event or condition, together with copies of
any such notice or communication. Receipt of such notice shall not be deemed to
create any obligation on the part of Landlord to defend or otherwise respond to
any such notification or communication except to the extent provided in Section
21.9.

                  21.5 NEGATIVE COVENANTS.

                           21.5.1 NO HAZARDOUS MATERIAL ON PREMISES. Except in
strict compliance with all Environmental Requirements, Tenant shall not cause,
permit or suffer any Hazardous Material to be brought upon, treated, kept,
stored, disposed of, discharged, released, produced, manufactured, generated,
refined or used upon, about or beneath the Premises by Tenant, its agents,
employees, contractors, subcontractors, guests, licensees or invitees. Tenant
shall deliver to Landlord copies of all documents except, FDA filings, which
Tenant provides to any governmental body in connection with compliance with
Environmental Requirements with respect to the Premises, such delivery to be
contemporaneous with provision of the documents to the governmental agency.

                           21.5.2 NO VIOLATIONS OF ENVIRONMENTAL REQUIREMENTS.
Tenant shall not cause, permit or suffer the existence or the commission by
Tenant, its agents, employees, contractors, subcontractors or guests, licensees
or invitees, a violation of any Environmental Requirements upon, about or
beneath the Premises or any portion thereof.

                           21.5.3 NO ENVIRONMENTAL OR OTHER LIENS. Tenant shall
not create or suffer or permit to exist with respect to the Premises, any lien,
security interest or other charge or encumbrance of any kind, including without
limitation, any lien imposed pursuant to section 107(f) of the Superfund
Amendments and Reauthorization Act of 1986 (42 U.S.C. section 9607(1) or any
similar state statute to the extent that such lien arises out of the actions of
Tenant, its agents, employees, contractors, subcontractors or guests, licensees
or invitees.

                  21.6 LANDLORD'S RIGHT TO INSPECT AND TO AUDIT TENANT'S
RECORDS. Landlord shall have the right in its sole and absolute discretion, but
not the

                                                                              18
<PAGE>

duty, to enter and conduct an inspection of the Premises and to inspect and
audit Tenant's records concerning Hazardous Materials at any reasonable time
solely to determine whether Tenant is complying with the terms of the lease,
including but not limited to the compliance of the Premises and the activities
thereon with Environmental Requirements and the existence of Environmental
Damages as a result of the condition of the Premises or surrounding properties
and activities thereon. Landlord shall comply with Tenants reasonable and
customary safety and confidentiality procedures. If Landlord has reasonable
cause to believe Tenant is in default with respect to any of the provisions of
this lease related to Hazardous Materials, Environmental Requirements or
Environmental Damages, then Landlord shall have the right, but not the duty, to
retain at the sole expense of Tenant an independent professional consultant to
enter the Premises to conduct such an inspection and to inspect and audit any
records or reports prepared by or for Tenant concerning such compliance;
provided that if such consultant determines that Tenant is in compliance with
the terms of this lease regarding Hazardous Materials, then the costs and
expenses of such inspection and audit shall be borne solely by Landlord. Tenant
hereby grants to Landlord the right to enter the Premises and to perform such
tests on the Premises as are reasonably necessary in the opinion of Landlord to
assist in such audits and investigations. Landlord shall use reasonable efforts
and will cooperate with Tenant in scheduling and procedures to minimize
interference with the business of Tenant by such tests inspections and audits,
but Landlord shall not be liable for any interference caused thereby except to
the extent resulting from Landlord's or Landlord's agent's gross negligence or
intentional misconduct.

                  21.7 LANDLORD'S RIGHT TO REMEDIATE. Should Tenant fail to
perform or observe any of its obligations or agreements pertaining to Hazardous
Materials or Environmental Requirements, then Landlord shall have the right, but
not the duty, without limitation upon any of the rights of Landlord pursuant to
this agreement, to enter the Premises personally or through its agents,
consultants or contractors and perform the same. Tenant agrees to indemnify
Landlord for the costs thereof and liabilities therefrom as set forth in
Paragraph 21.2.

                  21.8 LANDLORD'S OBLIGATION TO REMEDIATE. Landlord agrees to
remediate all Environmental Damages 1) caused by Landlord, its agents,
employees, contractors, subcontractors, guests, licensees or invitees, or 2) not
so caused but arising prior to Commencement Date hereof including, but not
limited to, those caused by any prior tenant and not caused by Tenant, its
agents, employees, contractors, subcontractors, guests, licensees or invitees.

                  21.9 LANDLORD'S OBLIGATION TO INDEMNIFY, DEFEND AND HOLD
HARMLESS CONCERNING ENVIRONMENTAL MATTERS. Landlord, its successors, assigns and
guarantors, agree to indemnify, defend, reimburse and hold harmless the
following persons from and against any and all Environmental Damages arising
from activities of Landlord or its employees, agents, contractors,
subcontractors or guests, licensees,

                                                                              19
<PAGE>

invitees; or which occurred prior to the Commencement Date including, but not
limited to, those caused by any prior tenant (and were not caused by Tenant, its
agents, employees, contractors, subcontractors, guests, licensees or invitees)
which (1) result in the presence of Hazardous Materials upon, about or beneath
the Premises or migrating to or from the Premises, or (2) result in the
violation of any Environmental Requirements pertaining to the Premises and the
activities thereon:

                  21.9.1 TENANT;

                  21.9.2 The directors, officers, shareholders, employees,
partners, agents, contractors, subcontractors, experts, licensees, affiliates,
lessees, mortgagees, trustees, heirs, devisees, successors, assigns and invitees
of Tenant.

         This obligation shall include, but not be limited to, the burden and
expense of the indemnified parties in defending all claims, suits and
administrative proceedings, including attorneys' fees and expert witness and
consulting fees, even if such claims, suits or proceedings are groundless, false
or fraudulent, and conducting all negotiations of any description, and paying
and discharging, when and as the same become due, any and all judgments,
penalties or other sums due against such indemnified persons, and all such
expenses incurred in enforcing the obligation to indemnify. Landlord, at its
sole expense, may employ additional counsel of its choice to associate with
counsel representing Tenant.

                  21.10 SURVIVAL OF ENVIRONMENTAL OBLIGATIONS. The obligations
of Landlord and Tenant as set forth in Paragraph 21 and all of its subparagraphs
shall survive termination of this lease.

         22. ENTRY BY LANDLORD. Landlord, or its authorized representative,
and/or any lender or prospective lender, shall have the right to enter the
Premises during the lease term at all reasonable times during usual business
hours for purposes of inspection, and/or the performance of any maintenance,
repairs or replacement therein. Landlord shall give Tenant such advance notice
of entry as is reasonable in light of the purpose for the entry. Landlord shall
have the right to enter the Premises and show the same to a prospective tenant
during the last 180 days of this lease or any extended term, unless the term
shall have been extended by mutual written agreement or delivery of notice of
exercise of any option to extend.

         23. DEFAULT - REMEDIES OF LANDLORD.

                  23.1 DEFAULT DEFINED. Any one or more of the following events
(each of which is herein sometimes called "event of default") shall constitute a
default:

                                                                              20
<PAGE>

                  23.1.1 Tenant defaults in the due and punctual payment of any
rent, taxes, tax deposits, insurance premiums, maintenance fees or other sums
required to be paid by Tenant under this lease when and as the same shall become
due and payable;

                  23.1.2 Tenant abandons the Premises;

                  23.1.3 Tenant defaults in the performance of or compliance
with any of the covenants, agreements, terms and conditions contained in this
lease, and such default shall continue for a period of twenty (20) days after
written notice thereof from Landlord to Tenant or five (5) days in the case of a
default under 23.1.1, unless the Tenant has defaulted under Paragraph 23.1.1
more than three times in any successive twelve (12) month period, in which case
there shall be no additional cure period and shall not be cured as permitted by
Paragraph 23.9;

                  23.1.4 Tenant files a voluntary petition in bankruptcy or is
adjudicated a bankrupt or insolvent, or takes the benefit of any relevant
legislation that may be in force for bankrupt or insolvent debtors or files any
petition or answer seeking any reorganization, arrangement, composition,
readjustment, liquidation, dissolution or similar relief for itself under any
present or future federal, state or other statute, law or regulation, or
proceedings are taken by Tenant under any relevant Bankruptcy Act in force in
any jurisdiction available to Tenant, or Tenant seeks or consents to or
acquiesces in the appointment of any trustee, receiver or liquidator of Tenant
or of all or any substantial part of its properties or of the Premises, or makes
any general assignment for the benefit of creditors;

                  23.1.5 A petition is filed against Tenant seeking any
reorganization, arrangement, composition, readjustment, liquidation, dissolution
or similar relief under any present or future federal, state or other statute,
law or regulation, and shall remain undismissed for an aggregate of 120 days, or
if any trustee, receiver or liquidator of Tenant or of all or any substantial
part of its properties or of the Premises is appointed without the consent or
acquiescence of Tenant and such appointment remains unvacated for an aggregate
of 120 days.

                  23.2 LANDLORD'S REMEDIES IN THE EVENT OF DEFAULT. In the event
of any event of default, Landlord shall have the option, without further notice
to Tenant or further demand for performance exercise any one or more of the
following remedies (and any other remedy available at law or in equity):

                           23.2.1 If Tenant has been late in payment of rent or
other sums due on four or more occasions during any period of one year,
Landlord, without terminating this lease, may 1) require that all future
payments be made by bank cashier's check, and/or 2) require an additional
security deposit in the amount of the then-current base rent for two months,
and/or 3) require that rent for each month be paid on or before

                                                                              21
<PAGE>

the 15th day of the preceding month. Such requirement shall be imposed by
Landlord's written notice delivered to Tenant. The additional security deposit
shall be paid within 10 days after delivery of the notice. The Landlord may or
may not exercise the remedies provided in this Paragraph 23.2.1, in its sole
discretion. The exercise of the remedies provided in this Paragraph 23.2.1 shall
not be required prior to the exercise of any other available remedy.

                           23.2.2 Without obligation to seek a new tenant, to
institute suit against Tenant to collect each installment of rent or other sum
as it becomes due or to enforce any other obligation under this lease even
though the Premises be left vacant.

                           23.2.3 As a matter of right, to procure the
appointment of a receiver for the Premises by any court of competent
jurisdiction. All rents, issues and profits, income and revenue from the
Premises shall be applied by such receiver to the payment of the rent, together
with any other obligations of the Tenant under this lease.

                           23.2.4 To re-enter and take possession of the
Premises and all personal property therein and to remove Tenant and Tenant's
agents and employees therefrom, and either:

                                    1) terminate this lease and sue Tenant for
damages for breach of the obligations of Tenant to Landlord under this lease; or

                                    2) without terminating this lease, relet,
assign or sublet the Premises as the agent and for the account of Tenant in the
name of Landlord or otherwise, upon the terms and conditions Landlord deems fit
with the new Tenant for such period (which may be greater or less than the
period which would otherwise have constituted the balance of the term of this
lease) as Landlord may deem best, and collect any rent due upon any such
reletting. In this event, the rents received on any such reletting shall be
applied first to the expenses of reletting and collecting, including, without
limitation, all repossession costs, reasonable attorneys' fees, and real estate
brokers' commissions, alteration costs and expenses of preparing said Premises
for reletting, and thereafter toward payment of the rental and of any other
amounts payable by Tenant to Landlord. If the sum realized shall not be
sufficient to pay the rent and other charges due from Tenant, then within five
days after demand, Tenant will pay to Landlord any deficiency as it accrues.
Landlord may sue therefor as each deficiency shall arise if Tenant shall fail to
pay such deficiency within the time limited.

                  23.3 TENANT TO SURRENDER PEACEABLY. In the event Landlord
elects to lawfully re-enter or take possession of the Premises as permitted in
this lease, Tenant shall quit and peaceably surrender the Premises to Landlord,
and Landlord may enter upon and re-enter the Premises and possess and repossess
itself thereof, by force, summary proceedings, ejectment or otherwise, and may
dispossess and remove Tenant

                                                                              22
<PAGE>

and may have, hold and enjoy the Premises and the right to receive all rental
income of and from the same.

                  23.4 NO TERMINATION BY RE-ENTRY. No re-entry or taking of
possession by Landlord shall be construed as an election on Landlord's part to
terminate or accept surrender of this lease unless Landlord's written notice of
such intention is delivered to Tenant.

                  23.5 INJUNCTION. In the event of any breach by Tenant of any
of the agreements, terms, conditions or covenants contained in this lease,
Landlord, in addition to any and all other rights, shall be entitled to enjoin
such breach and shall have the right to invoke any right and remedy allowed at
law or in equity or by statute or otherwise for such breach as though re-entry,
summary proceedings, and other remedies were not provided for in this lease.

                  23.6 REMEDIES LISTED ARE CUMULATIVE AND NON-EXCLUSIVE. The
enumeration of the foregoing remedies does not exclude any other remedy, but all
remedies are cumulative and shall be in addition to every other remedy now or
hereafter existing at law or in equity, including, but not limited to, the
remedies provided in Paragraph 23.11.

                  23.7 INTEREST ON SUMS PAST DUE. All rent and all other amounts
due from Tenant hereunder shall bear interest at the rate of eighteen percent
(18%) per annum compounded quarterly from their respective due dates until paid,
provided that this shall in no way limit, lessen or affect any claim for damages
by Landlord for any breach or default by Tenant.

                  23.8 ATTORNEYS' FEES. Reasonable attorneys' fees, expert
witness fees, consulting fees and other expenses incurred by either party by
reason of the breach by either party in complying with any of the agreements,
terms, conditions or covenants of this lease shall constitute additional sums to
be paid to the prevailing party on demand.

                  23.9 TIME TO CURE CERTAIN NON-MONETARY DEFAULTS. In the event
of any default other than those events described in Paragraph 23.1.1, for which
notice has been given as provided in Paragraph 23.1.3, which because of its
nature can be cured but not within the period of grace heretofore allowed, then
such default shall be deemed remedied for purposes of this Paragraph 23, if the
correction thereof shall have been commenced within said grace period or periods
and shall, when commenced, be diligently prosecuted to completion.

                  23.10 LANDLORD DEFAULT. If Landlord is in default under any of
its obligations and the default continues for twenty (20) days after written
notice from

                                                                              23
<PAGE>

Tenant (subject to extension pursuant to 23.9), Tenant may pursue all remedies
at law or in equity. Landlord will use reasonable efforts to promptly remedy the
default within twenty (20) days. Tenant may, but shall not be required to,
correct such default for the Landlord's account, and the expense shall be
promptly paid within ten (10) days by Landlord; however, in no event shall
Tenant have the right to rental abatement, offset of expenses against rental, or
the right to terminate this lease unless Tenant's legal or equitable remedies
provide otherwise.

         Tenant may not offset any sum due or assertedly due from Landlord to
Tenant against any sum due from Tenant to Landlord.

         Tenant agrees that if Tenant obtains a judgment against Landlord
arising out of Landlord's obligations under this lease, such judgment shall be
limited in the aggregate to the greater of $1,169,000 or the equity value in the
Premises at the time of the judgment; and such judgment may be satisfied only by
execution and sale of Landlord's interest in the Premises. Tenant may not seek
execution against other property of Landlord, nor pursue any judgment, execution
or other remedy against the partners or other owners of Landlord or any of their
property. Immediately upon receipt of Landlord's written request, Tenant will
release any property (other than the Premises) from the lien of any judgment
obtained by Tenant against Landlord arising out of Landlord's obligations under
this Lease. The limitations provided in this paragraph shall not apply to
Landlord's obligations under Section 21.9, or to Landlord's gross negligence,
intentional misconduct or willful breach.

                  23.11 LANDLORD'S RIGHT TO REMOVE. In the event that Tenant is
in default hereunder and has failed to cure such default after notice and
opportunity to cure as provided herein, Landlord may proceed to remove, or have
the appropriate governmental agencies remove all of Tenant's property from the
Premises and store the same at Tenant's sole risk. The cost of such removal
shall be paid by Tenant to Landlord upon demand.

         24. LEGAL PROCEEDINGS AGAINST TENANT BY THIRD PARTIES; TENANT TO PAY
LANDLORD'S FEES. In the event of any proceeding at law or in equity wherein
Landlord, without being in default as to its covenants under the terms hereof,
shall be made a party to any litigation by reason of Tenant's interest in the
Premises, Tenant shall be liable for and shall pay all costs and expenses
incurred by Landlord, including reasonable attorneys' fees, expert witness fees
and consultant's fees.

         25. INDEMNIFICATION BY TENANT AND BY LANDLORD. The Tenant shall
indemnify and save harmless Landlord of and from liability for damages or claims
against Landlord, including costs, attorneys' fees and expenses of Landlord in
defending against a third party claim, on account of injuries to any person or
property, if the injuries are caused by the negligence or willful misconduct of
Tenant, its

                                                                              24
<PAGE>

agents, servants or employees, or of any other person entering upon the Premises
under express invitation of Tenant or if such injuries are the result of the
violation by Tenant, its agents, servants, or employees, of laws, ordinances,
other governmental regulations, or of the terms of this lease.

         The Landlord shall indemnify and save harmless Tenant of and from
liability for damages or claims against Tenant, including costs, attorneys' fees
and expenses of Tenant in defending against a third party claim, on account of
injuries to any person or property, if the injuries are caused by the negligence
or willful misconduct of Landlord, its agents, servants or employees, or of any
other person entering upon the Premises under express invitation of Landlord or
where such injuries are the result of the violation by Landlord, its agents,
servants or employees, of laws, ordinances, other governmental regulations, or
of the terms of this lease.

         26. ASSIGNMENT OR SUBLETTING. Tenant shall not assign, mortgage, or
encumber this lease, nor sublet or permit the Premises or any part thereof to be
used by others, without the prior written consent of Landlord in each instance,
which consent shall not be unreasonably withheld.

         In connection with an assignment, sublease or encumbrance Landlord may
require the submittal of detailed financial information about the prospective
subtenant or assignee, to be reviewed by Landlord, and may require a guarantee
of the obligations of the prospective subtenant or assignee, and may require
detailed financial information about the guarantor, to be reviewed by Landlord;
and there may be alterations to this lease and alterations to the building which
are necessary to consummate the transaction. The Landlord may require Tenant or
the prospective assignee or sub-tenant to pay for the alterations to the
building, and may require that Landlord perform same. In addition, Landlord may
charge a $500 administration fee due in full upon Landlord's consent, as payment
to Landlord for its costs and expenses in connection with the assignment or
sublease. No fee will be charged in connection with an assignment or sublease to
an assignee or subtenant who is "affiliated" with Tenant. "Affiliated" means
under common voting control, directly or indirectly.

         If this lease is assigned, or if the Premises or any part thereof is
sublet, or occupied by anyone other than Tenant, Landlord may, after default by
Tenant, collect rent from the assignee, sub-tenant, or occupant and apply the
net amount collected against all rent herein reserved. No such subletting,
occupancy, or collection shall be deemed a waiver of this covenant, or the
acceptance of the sub-tenant, or occupant as tenant, or a release of Tenant from
further performance by Tenant of the covenants in this lease. The consent by
Landlord to an assignment shall be deemed a full and complete release of Tenant
from further performance by Tenant of the covenants in this lease. The consent
by Landlord to an assignment or subletting shall not be construed to relieve

                                                                              25
<PAGE>

Tenant (or any subsequent tenant) from obtaining the consent in writing of
Landlord to any further assignment or subletting.

         27. LANDLORD'S WARRANTY OF TITLE; QUIET ENJOYMENT. Landlord covenants
it has good right to lease the Premises in the manner described herein and that
Tenant shall peaceably and quietly have, hold, occupy, and enjoy the Premises
during the term of the lease; except as provided in Paragraph 31 concerning
subordination to mortgage lenders.

         28. ADDITIONAL DEVELOPMENT OF PROPERTY - RIGHTS OF LANDLORD. Landlord
does reserve, during the term of this lease, the right to go upon and deal with
the Premises or part thereof for the purpose of implementing a common
development plan for the project of which the Premises are a part, and to
install non-exclusive sidewalks, paths, roadways and other street improvements
for use by vehicles, pedestrians, and for parking; to undertake such drainage
programs to handle underground and surface drainage water and to make any other
changes and/or improvements as Landlord shall deem advisable in the exercise of
its sole discretion; provided, however, any such action by Landlord shall not
unreasonably interfere with the rights of Tenant hereunder.

         29. GOVERNMENTAL ACQUISITION OF THE PREMISES. The parties agree that
Landlord shall have sole and exclusive authority to negotiate and settle all
matters pertaining to the acquisition of all or part of the Premises by a
governmental agency by eminent domain or threat thereof (condemnation), and to
convey all or any part of the Premises under threat of condemnation. It is
agreed that any compensation for land and/or buildings to be taken whether
resulting from negotiation and agreement or condemnation proceedings, shall be
the exclusive property of Landlord, and that there shall be no sharing
whatsoever between Landlord and Tenant of any such sum. Such taking of property
shall not be considered as a breach of this lease by Landlord, nor give rise to
any claims in Tenant for damages or compensation from Landlord. Tenant may
separately claim and recover from the condemning authority the value of any
personal property owned by Tenant which is taken, and any relocation expenses
owed to Tenant by the condemning authority. If the taken portion of the Premises
consists only of areas where no building is constructed, and the land area of
the Premises is reduced by less than ten percent, and the parking area available
for use by Tenant is reduced by less than five percent, and there is no material
change in Tenant's access to the Premises, then there shall be no change in the
terms of the lease except with respect to a prorated reduction in rent and
expenses. If no building area is taken but the foregoing limits on parking area
reductions are exceeded, then Tenant may terminate the lease unless Landlord
provides sufficient reasonably adjacent parking area so that the total available
parking area is reduced by less than five percent. If upon a conveyance or
taking in excess of the limits described above, Tenant shall have two options.
First, Tenant may terminate the lease by written notice delivered to Landlord
within 60 days

                                                                              26
<PAGE>

after the conveyance or taking. Second, Tenant may retain the remaining portion
of the Premises, under all the terms and conditions hereof, but the base rental
shall be reduced in proportion to the number of square feet of building floor
space taken compared to the number of square feet of building floor space on the
Premises prior to the taking.

         30. SUBORDINATION OF THE LEASEHOLD TO MORTGAGES. This lease shall be
subject and subordinate in priority at all times to the lien of any existing
and/or hereafter executed mortgages and trust deeds encumbering the Premises.
Although no instrument or act on the part of Tenant shall be necessary to
effectuate such subordination, Tenant will execute and deliver such further
instruments subordinating this lease to the lien of any such mortgages or trust
deeds as may be desired by the mortgagee or holder of such trust deeds. Tenant
hereby appoints Landlord as his attorney in fact, irrevocably, to execute and
deliver any such instrument for Tenant. Tenant further agrees at any time and
from time to time upon not less than ten (10) days prior written request by
Landlord, to reasonably execute, acknowledge, and deliver to Landlord an
estoppel affidavit in form acceptable to Landlord and the holder of any existing
or contemplated mortgage or deed of trust encumbering the Premises. Tenant's
failure to deliver such statement within such time shall be conclusive upon
Tenant (1) that this lease is in full force and effect, without modification
except as may be represented by Landlord; (2) that there are no uncured defaults
in Landlord's performance; and (3) that not more than one (1) month's rent has
been paid in advance. Further, upon request, Tenant shall supply to Landlord a
corporate resolution certifying that the party signing this statement on behalf
of Tenant is properly authorized to do so, if Tenant is a corporation. Tenant
agrees to provide Landlord within ten business days of Landlord's request,
Tenant's most recently completed financial statements and such other financial
information as reasonably requested by Landlord in order to verify Tenant's
financial condition to satisfy requirements of Landlord's existing or
contemplated lender or mortgagee.

         Tenant agrees with lender and Landlord that if there is a foreclosure
of any such mortgage or deed of trust and pursuant to such foreclosure, the
Public Trustee or other appropriate officer executes and delivers a deed
conveying the Premises to the lender or its designee, or in the event Landlord
conveys the Premises to the lender or its designee in lieu of foreclosure,
Tenant will attorn to such grantee of the Premises, rather than to Landlord, to
perform all of Tenant's obligations under the lease, and Tenant shall have no
right to terminate the lease by reason of the foreclosure or deed given in lieu
thereof.

         Landlord will include in the terms of any mortgage or deed of trust on
the Premises a provision that if Tenant is not in default under the terms of
this lease and Tenant is then in possession of the Premises, Tenant's rights of
quiet enjoyment arising out of the lease shall not be affected or disturbed by
lender in the event of a default by Landlord and any sale of the Premises
through foreclosure of any deed of trust or

                                                                              27
<PAGE>

otherwise. Landlord's obligation in the preceding sentence will only apply to
the extent that it is still considered commercially reasonable in the commercial
lending industry to provide such nondisturbance assurances at the time of any
financing or refinancing secured by the Premises. Landlord will provide the
Tenant, within sixty (60) days of the execution hereof, a Subordination,
Non-Disturbance and Attornment in the form of Exhibit C, attached hereto.

         31. TENANT'S FINANCIAL STATEMENTS. A current financial statement of
Tenant shall be provided to Landlord for review and approval upon execution
hereof and annually thereafter if so requested by Landlord.

         32. MEMORANDUM OF LEASE - RECORDING. This lease shall not be recorded
in the office of the County Clerk and Recorder of Boulder County, except by
Landlord as a financing statement. In order to effect public recordation, the
parties hereto shall, at the time this lease is executed, execute a Memorandum
of lease incorporating therein by reference the terms of this lease including
any option rights hereunder, but deleting therefrom any expressed statement or
mention of the amount of rent herein reserved, which instrument may be recorded
by either party in the office of the Clerk and Recorder of Boulder County. The
Landlord hereby consents to the Tenant providing a copy of this Lease to the
Securities and Exchange Commission for the specific purpose of complying with
their reporting requirements.

         33. NO WAIVER OF BREACH; ACCEPTANCE OF PARTIAL PAYMENTS OF RENT. No
assent, or waiver expressed or implied, or failure to enforce, as to any breach
of any one or more of the covenants or agreements herein shall be deemed or
taken to be a waiver of any succeeding or additional breach.

         Payment by Tenant or receipt by Landlord of an amount less than the
rent or other payment provided for herein shall not be deemed to be other than a
payment on account of the earliest rent then due, nor shall any endorsement or
statement on any check or any letter accompanying any check or payment of rent
be deemed an accord and satisfaction, and Landlord may accept such check or
other payment without prejudice to Landlord's right to recover the balance of
all rent then due, and/or to pursue any or all other remedies provided for in
this lease, in law, and/or in equity including, but not limited to, eviction of
Tenant. Specifically, but not as a limitation, acceptance of a partial payment
of rent shall not be a wavier of any default by Tenant.

         34. CONTROLLING LAW. The lease, and all terms hereunder shall be
governed by the laws of the State of Colorado, exclusive of its conflicts of
laws rules.

         35. INUREMENTS. The covenants and agreements herein contained shall
bind and inure to the benefit of Landlord and Tenant and their respective
successors.

                                                                              28
<PAGE>

This lease shall be signed by the parties in duplicate, each of which shall be a
complete and effective original lease.

         36. TIME. Time is of the essence in this lease in each and all of its
provisions in which performance is a factor.

         37. ADDRESSES; EMPLOYER IDENTIFICATION NUMBERS; METHOD OF GIVING
NOTICE. The street address of Landlord is 2101 Ken Pratt Blvd. Suite 200,
Longmont, CO 80501. The mailing address of Landlord is P. O. Box 1937, Longmont,
CO 80502-1937. All payments, notices and communications which are sent to
Landlord via United States mail shall be addressed to the mailing address. Only
payments, notices and communications which are hand delivered or delivered by
private courier service shall be addressed to the street address.

         Tenant's present street address is 3200 Walnut Street, Boulder, CO
80301. Any notice to Tenant may be delivered to the above address.

         Landlord's current fax number is (303) 776-4946. Tenant's current fax
number is 303-381-6697. Any written notice required hereby may be delivered by
fax, U.S. mail, private courier service, or hand delivery. Notice shall be
effective at time of delivery to the address or fax number shown.

         Either party may change its street or mailing address, or fax number,
for purposes hereof, by written notice delivered to the other. The federal
employer identification number of Landlord is 84-1165292. The federal
identification number of Tenant is. 84 1460 811.

         38. PARAGRAPH HEADINGS; GRAMMAR. All paragraph headings are made for
the purposes of ease of location of terms and shall not affect or vary the terms
hereof. Throughout this lease, wherever the words, "Landlord" and "Tenant" are
used they shall include and imply to the singular, plural, persons both male and
female, and all sorts of entities and in reading said lease, the necessary
grammatical changes required to make the provisions hereof mean and apply as
aforesaid shall be made in the same manner as though originally included in said
lease.

         39. FLEXIBILITY CLAUSE. Landlord hereby gives Tenant the option to
terminate this lease on May 31, 2005, and all obligations as set forth
thereunder, by providing Landlord with 180 days written notice. In consideration
for early termination, upon written notice to terminate, Tenant shall pay to
Landlord, the equivalent of one months then current base rental as a termination
penalty.

         40. EXPANSION OPTIONS: Landlord hereby grants to Tenant, after the
Commencement Date, a right of First Offer on 2500 Trade Centre and shall use its

                                                                              29
<PAGE>

best efforts to provide a right of First Offer for the buildings located at
2420, 2410 and 2400 Trade Centre when that space becomes available for lease.

         41. ADDITIONAL PROVISIONS.

         (i) Increases related to management, administrative, and accounting
fees shall be capped at four percent (4%) per year.

         (ii) Upon execution of this lease, Tenant shall reimburse Texas
Instruments for their relocation expenses in the amount of $30,000 related to
their move to 2420 Trade Centre.

         (iii) Subject to the provisions of Paragraph 10 and the Landlord's
lender's consent, The Tenant shall have the right to construct, at the Tenant's
sole cost and expense, a pedestrian covered, enclosed and heated walkway between
2620 and 2600 Trade. This walkway will not be for occupancy. The Tenant shall
obtain all necessary municipal and covenant consents including building permits
and licenses. Tenant shall not pay rent for the walkway area but shall be
responsible for any increases in operating expenses related to the new structure
including real property taxes, insurance and maintenance cost.

         (iv) Tenant shall provide an irrevocable stand by letter of credit in
favor of Landlord, in an amount to be mutually agreed upon, prior to the
Commencement Date, as security for the restoration of certain basic elements of
the building; specifically, the rest room cores, communications closets (IDF)
and cabling, modifications to entrances, roof-top HVAC units and distribution
ducting. This requirement shall specifically exclude interior doors and walls
and the like. Landlord shall be unilaterally entitled to draw upon this letter
of credit if:

                  (a) Tenant files for or is forced into bankruptcy, as set
         forth in Sections 23.1.4 & 23.1.5 of the Lease, or

                  (b) Landlord elects, at the end of the lease term or within 6
         months thereafter, regardless of the manner in which the lease is
         terminated, to require removal of all or part of the alterations and
         tenant improvements and restoration of these basic elements, and Tenant
         does not promptly and diligently perform same.

         (v) Tenants shall have the right to install their own fire sprinkler
monitoring system. Upon reasonable notice, the Tenant shall provide Landlord
with documentation that there is a monitoring contract in place and that the
systems are being properly maintained.

                                                                              30
<PAGE>

         (vi) Upon the execution hereof, the Tenant shall pay to the Landlord
the sum of One Hundred Thirty Thousand and 00/100THS ($130,000.00) for existing
tenant improvements within the Premises.

         (vii) Landlord shall be permitted to remove, prior to Tenant's
occupancy, the following materials from the building:

         1.       Special 2' x 2' light fixtures.

         2.       Security system hardware, including exterior telephones and
                  surveillance devices.

         3.       Interior security doors with panic exit devices.

         4.       Electric UPS equipment.

         5.       Telephone switch and equipment.

         6.       Rear patio cover.

         7.       Reception desk.

         8.       Interior sign holders.

         9.       Leibert HVAC unit.

         10.      Cabinetry, sinks, hot water heater, water closet, locker
                  accessories, etc. except in bath cores.

         11.      Whiteboards, projection screen, sound and video equipment.

         12.      Fabric wallboard.

         13.      Ice machine and refrigerator.

         14.      Air compressor.

                                                                              31
<PAGE>

IN WITNESS WHEREOF, the Parties have executed this lease as of the date hereof.

LANDLORD:                             PRATT LAND LIMITED LIABILITY
                                      A Colorado limited liability company

                                      By ____________________________________
                                         Martin W. McElwain, Manager

TENANT:                               ARRAY BIOPHARMA, INC.
                                      A Delaware corporation

                                      By ____________________________________
                                         R. Michael Carruthers, CFO

STATE OF COLORADO   )
                    ) ss.
COUNTY OF BOULDER   )

The foregoing instrument was acknowledged before me this _____ day of _________,
2002 by Martin W. McElwain , Manager, Pratt Land Limited Liability Company.

Witness my hand and official seal.

My commission expires:

                                         ____________________________________
                                         Notary Public-

STATE OF __________  )
                     ) ss.
COUNTY OF__________  )

The foregoing instrument was acknowledged before me this ________ day of ______,
2002 by _________________________________________________________.

Witness my hand and official seal.

My commission expires: __________________

                                         ____________________________________
                                         Notary Public

                                                                              32<PAGE>
                                                                    EXHIBIT 10.1

                              EMPLOYMENT AGREEMENT

         THIS EMPLOYMENT AGREEMENT ("Agreement") is made and entered into as of
April 1, 2002 by and between WESTPORT RESOURCES CORPORATION, a Nevada
corporation, whose address is Suite 2300, 410 17th Street, Denver, Colorado
80202 (the "Westport"), and DONALD D. WOLF, whose address is 16401 Rocky Point
Lane, Morrison, Colorado 80465 ("Officer").

                                    RECITALS

         WHEREAS, the Officer is a key employee of Westport and serves as
Westport's Chairman of the Board and Chief Executive Officer, and Westport and
the Officer desire to set forth herein the terms and conditions of the Officer's
employment and his compensation in the event of a termination of the Officer's
employment in connection with a Change in Control or otherwise.

         WHEREAS, in the event of a Change in Control, the Officer may be
vulnerable to dismissal without regard to quality of the Officer's service, and
Westport believes that it is in the best interests of Westport to enter into
this Agreement in order to ensure fair treatment of the Officer and to reduce
the distractions and other adverse effects upon such the Officer's performance
which are inherent in such a Change in Control.

         NOW, THEREFORE, for and in consideration of the foregoing, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                    AGREEMENT

         1. Definitions. For purposes hereof, the following terms shall have the
following meanings:

            (a) "Affiliate" shall mean, with respect to any Person (as defined
herein), any other Person directly or indirectly controlling, controlled by or
under direct or indirect common control with such Person. A Person shall be
deemed to control another Person for purposes of this definition if such Person
possesses, directly or indirectly, the power (i) to vote the securities or other
ownership interests having ordinary voting power to elect a majority of the
Board of Directors of a corporation or other Persons performing similar
functions for any other type of Person, or (ii) to direct or cause the direction
of the management and policies of such Person, whether through the ownership of
voting securities, by contract, as general partner, as trustee or otherwise.

            (b) "Bonus Amount" shall mean the average of the annual bonuses
earned by the Officer for the three calendar years in which bonuses were paid
preceding the year of Officer's termination, or if the Officer has been employed
by the Westport for less than three calendar years prior to termination, the
average for such lesser period of time (excluding years in which bonuses

<PAGE>

were not paid). The Board of Directors shall determine, taking into
consideration Westport performance, target bonus amounts and other factors, the
Bonus Amount of the Officer if the Officer has not been employed by the Westport
for a period of time during which bonuses have been paid.

            (c) "Cause" shall mean: (i) the Officer's material breach of any
terms of this Agreement; (ii) the Officer's willful and continued failure to
perform his or her job duties and responsibilities; (iii) the Officer's
dishonesty towards, fraud upon, crime against, deliberate or attempted injury or
bad faith action with respect to Westport or any of its Affiliates; or (iv) the
Officer's conviction for any felony crime (whether in connection with Westport's
or any of its Affiliates' affairs or otherwise); provided, however, that with
respect to clauses (i) and (ii), no such breach or failure shall constitute
Cause unless such breach or failure continues after 30 days following written
notice by Westport the Officer of such breach or failure setting forth with
specificity the nature of such breach or failure.

            (d) "Change in Control" shall have occurred if (a) any "person" or
"group" (within the meaning of Sections 13(d) and 14(d)(2) of the Securities
Exchange Act of 1934 (the "1934 Act")), other than a trustee or other fiduciary
holding securities under an Officer benefit plan of Westport or the current
beneficial owners or their Affiliates (as defined herein) are or become the
"beneficial owner" (as defined in Rule 13d-3 under the 1934 Act), directly or
indirectly, of more than one-half of the then outstanding voting stock of
Westport; or (b) there occurs a merger or consolidation of Westport with any
other corporation, other than a merger of consolidation which would result in
the voting securities of Westport outstanding immediately prior thereto
continuing to represent (either by remaining outstanding or by being converted
into voting securities of the surviving entity) at least a majority of the
combined voting power of the voting securities of Westport or such surviving
entity outstanding immediately after such merger or consolidation, or the
stockholders approve a plan of complete liquidation of Westport or an agreement
for the sale or disposition by Westport of all or substantially all of
Westport's assets.

            (e) "Disability" shall mean a physical or mental infirmity which
impairs the Officer's ability to perform substantially his or her duties for a
period of one hundred eighty (180) consecutive days.

            (f) "Good Reason" shall include any of the following:

                        (i) Westport's assignment to the Officer of duties
            inconsistent with, or a substantial alteration in the nature of, the
            Officer's responsibilities in effect immediately prior to the Change
            in Control;

                        (ii) (A) a reduction in either the Officer's salary or
            target bonus (if a target bonus has been established for the
            Officer) as each is in effect on the date of a Change in Control, or
            (B) the discontinuance or material adverse alteration of any
            material pension, welfare or fringe benefit enjoyed by Officer on
            the date of a Change in Control, unless such action relates to a
            discontinuance of benefits on a management-wide or company-wide
            basis;

                                       2
<PAGE>

                        (iii) Westport's relocation of the Officer to any place
            in excess of 50 miles from the Officer's place of employment
            immediately prior to the Change in Control without the Officer's
            written consent, except for reasonably required travel by the
            Officer on Westport's business;

                        (iv) any material breach by Westport of any provision of
            this Agreement, if such material breach has not been cured within 30
            days following written notice by the Officer to Westport of such
            breach setting forth with specificity the nature of the breach; or

                        (v) any failure by Westport to obtain the assumption of
            this Agreement by any successor (by merger, consolidation or
            otherwise) or assign of Westport.

            (g) "Person" shall mean any individual, partnership, joint venture,
firm, Westport, corporation, association, trust or other enterprise or any
government or political subdivision or any agent, department or instrumentality
thereof.

            (h) "Qualifying Termination" shall mean (i) a termination by the
Officer of the Officer's employment with Westport for Good Reason within one
year after the occurrence of a Change in Control or (ii) a termination of
Officer's employment without Cause by Westport within one year after the
occurrence of a Change in Control, or (iii) a termination of Officer's
employment without Cause by Westport within six (6) months prior to the date of
a Change in Control if the Officer reasonably demonstrates that such termination
(A) was at the request of a third party who has indicated an intention or taken
steps reasonably calculated to effect a Change in Control or (B) otherwise arose
in connection with, or in anticipation of, a Change in Control which has been
threatened or proposed provided that, in either case, a Change in Control shall
actually have occurred. Neither a termination of Officer's employment due to
Disability nor a termination of Officer's employment due to death shall
constitute a Qualifying Termination.

            (i) "Voluntary Termination" shall mean termination by Officer of
Officer's employment with Westport, but shall not include constructive
termination by Westport by reason of material breach of this Agreement by
Westport. Voluntary Termination shall include a termination of Officer by
Westport after its receipt of a notice of an otherwise Voluntary Termination
from Officer.

         2. Service.

            (a) Position. Officer agrees to be employed by and to serve Westport
as Chairman and Chief Executive Officer, and Westport agrees to employ and
retain Officer in such capacity in accordance with the terms of this Agreement.
Officer shall have powers as determined by Westport's Board of Directors and
duties commensurate with his position as Chairman and Chief Executive Officer of
Westport.

            (b) Duties. The Officer shall assume and discharge the
responsibilities of the Chairman and Chief Executive Officer (as set forth in
the Bylaws of Westport), as well as such other responsibilities as may be
assigned to him by the Board of Directors of Westport. Officer

                                       3
<PAGE>

shall perform his responsibilities to the best of his abilities, shall comply
with the general management policies of Westport as announced by the Board of
Directors from time to time and shall devote all of his business time, skill and
attention to the good faith best efforts performance of his responsibilities and
the affairs of Westport. The Officer will engage in no other business or
activity for compensation during the term of this Agreement except with the
prior written consent of Westport. The Officer shall always be subject to the
directions of the Board of Directors, to whom Officer shall report directly, in
the performance of his responsibilities, and nothing herein shall affect the
power of the Board of Directors to limit, alter, restrict, or remove the
authority of the Officer. Officer's principal place of business with respect to
his services to Westport shall be at its offices located in the Denver, Colorado
metropolitan area or other location reasonably acceptable to Officer. Officer
shall be required at various times to travel as part of his duties.

         3. Term of Employment.

            (a) Basic Term. The initial term of employment of Officer by
Westport shall be from the date hereof through May 31, 2005 (the "Term") unless
terminated earlier pursuant to this Agreement. If a Change in Control has not
occurred within the Term of this Agreement, this Agreement shall automatically
expire. Following the Term, this Agreement may be renewed only by written
agreement of the parties for successive one-year periods.

            (b) Change of Control. If a Qualifying Termination occurs during the
Term, this Agreement shall continue in full force and effect and shall not
terminate until the Officer shall have received the severance compensation
provided hereunder.

         4. Salary, Benefits and Bonus Compensation.

            (a) Base Salary. Commencing January 1, 2002, Westport agrees to pay
to Officer a "Base Salary" of $381,516.96 per annum, payable on Westport's
regularly established payroll payment dates. The Base Salary shall be subject to
modification for each calendar year or portion thereof determined in the sole
discretion of the Board of Directors. In the absence of and until any salary
determination by the Board, Officer's Base Salary for a particular calendar year
shall be identical to Officer's Base Salary in effect on December 31st of the
immediately preceding calendar year.

            (b) Benefits.

                (i) Officer Benefits. Officer shall be eligible to participate
in such of Westport's benefit and compensation plans as may be generally
available to employees of Westport, including participation in Westport's health
insurance plan, bonus plan, and its 401(k) program. All such benefit plans may
be amended or discontinued in the sole discretion of Westport.

                (ii) Business Expenses. Westport shall reimburse Officer for all
reasonable and necessary expenses incurred in carrying out his duties under this
Agreement, including travel and entertainment expenses. Officer shall present
monthly to Westport an

                                       4
<PAGE>

itemized account of such expenses in such form as may be required by Westport.

                (iii) Auto. Officer shall be provided with an appropriate
Westport automobile to be used for business purposes in the course of performing
his duties described in Section 1(b). The automobile may also be used by the
Officer for personal travel, and, in such event, the Officer shall maintain
records regarding automobile use as required by federal tax regulations. The
Officer's records of automobile use shall be available to Westport upon request.

                (iv) Vacation and Health Club. Officer shall be entitled to
vacation time generally available to executive employees of Westport (but no
less than four weeks per year), during which vacation time his compensation
shall be paid in full. Officer shall be eligible to use Westport's health club
membership and Petroleum Club membership.

                (v) Stock Option.  In addition to the stock options previously
granted to Officer by Westport, Officer shall be granted stock options in such
amounts and for such vesting periods as shall be determined by the Compensation
Committee of the Board of Directors of Westport pursuant to Westport's Stock
Incentive Plan (the "Plan"). Such grants shall be evidenced by stock option
agreements to be entered into by and between Westport and Officer pursuant to
the Plan.

                (vi) Severance. If, prior to May 31, [2005], Officer is subject
to a termination of his employment by Westport other than for Cause, Westport
shall pay Officer a sum equal to three times Officer's then applicable annual
Base Salary and three times the average of the last three years' bonuses.

         (c) Other Benefits. Nothing in this Article 4 shall be deemed to limit
or restrict any right or benefit of Officer under Westport's Certificate of
Incorporation, Bylaws or other documents or agreements of Westport applicable to
Officer.

         5. Termination of Employment.

            (a) Termination for Cause. Termination for Cause of Officer's
employment may be effected by Westport at any time without liability except as
specifically set forth in this Section 5(a). The termination shall be effected
by written notification to Officer and shall be effective as of the time set
forth in such notice. At the effective time of a termination for Cause, Officer
immediately shall be paid all accrued Base Salary and any reasonable and
necessary business expenses incurred by Officer in connection with his duties
hereunder, all to the effective date of termination. In addition, Officer shall
be entitled to benefits under any benefit plans of Westport in which Officer is
a participant to the full extent of Officer's rights under such plans.

            (b) Termination Other Than for Cause. Westport may effect a
termination of the Officer's employment other than for Cause at any time for any
or no reason upon giving written notice to Officer of such termination and
without liability except as specifically set forth in this Section 5(b).
Expiration of the Term of this Agreement shall not be deemed a termination other
than for Cause within the meaning of this paragraph. The termination shall be
effective as

                                       5
<PAGE>

of the time set forth in such notice. At the effective date of any termination
other than for Cause, upon the Officer's execution of a "Release and
Confidentiality Agreement" substantially in the form attached hereto as Exhibit
A, Officer shall immediately be paid all accrued Base Salary, severance payments
pursuant to Section 4(b)(vi) and any reasonable and necessary business expenses
incurred by Officer in connection with his duties hereunder, all to the
effective date of termination. In addition, Officer shall be entitled to
benefits under any benefit plans of Westport in which Officer is a participant
to the full extent of Officer's rights under such plans.

            (c) Disability. If, during the term of this Agreement, Officer, in
the reasonable judgment of the Board of Directors of Westport, has failed to
perform his duties under this Agreement on account of illness or physical or
mental disability, which condition renders Officer incapable of performing the
duties of this office, and such condition continues for a period of more than
three (3) months, Westport shall have the right to terminate Officer's
employment hereunder by written notification to Officer. In the event of such
termination, Westport shall pay to Officer all accrued Base Salary and any
reasonable and necessary business expenses incurred by Officer in connection
with his duties hereunder, all to the effective date of termination, and
severance payments pursuant to Section 4(b)(vi). In addition, Officer shall be
entitled to benefits under any benefit plans of Westport in which Officer is a
participant to the full extent of Officer's rights under such plans.

            (d) Death. In the event of Officer's death during the Term of this
Agreement, Officer's employment shall be deemed to have terminated as of the
last day of the month during which his death occurs, and Westport shall pay
promptly to his estate all accrued Base Salary and any reasonable and necessary
business expenses incurred by Officer in connection with his duties hereunder,
all to the effective date of termination. Officer's estate shall also be
entitled to benefits under any benefit plans of Westport in which Officer is a
participant to the full extent of Officer's rights under such plans.

            (e) Voluntary Termination. In the event of a Voluntary Termination
by Officer, Westport shall immediately pay all accrued Base Salary and any
reasonable and necessary business expenses incurred by Officer in connection
with his duties hereunder, all to the effective date of termination. In
addition, Officer shall be entitled to benefits under any benefit plans of
Westport in which Officer is a participant to the full extent of Officer's
rights under such plans.

            (f) Qualifying Termination. If a Qualifying Termination occurs, the
Officer shall immediately be paid all earned and accrued salary due and owing to
the Officer, any bonus compensation to the extent earned, vested deferred
compensation (other than pension plan or profit sharing plan benefits, which
will be paid in accordance with the applicable plan), any benefits then due
under any plans of Westport in which the Officer is a participant, any accrued
and unpaid vacation pay and any appropriate business expenses incurred by the
Officer in connection with his duties, all to the date of termination
(collectively, "Accrued Compensation"). The Officer shall also be entitled to
the severance compensation described in Section 6.

         6. Severance Compensation Upon a Qualifying Termination. The Officer
shall be entitled to the following upon a Qualifying Termination under the
conditions set forth below:

                                       6
<PAGE>

            (a) Condition to Payment of Severance Compensation. Upon the
Officer's execution of a "Release and Confidentiality Agreement" substantially
in the form attached hereto as Exhibit A, Westport shall pay to the Officer
severance compensation in an aggregate amount equal to three times the sum of
the Officer's Base Salary and the Bonus Amount (the "Severance Amount").

            (b) Computation and Payment of Severance Amount. The Severance
Amount shall be computed by using the higher of the salary paid to the Officer:
(a) immediately preceding the Change in Control, or (b) immediately preceding
the Officer's Qualifying Termination. The Severance Amount shall be paid without
prejudice to the Officer's right to receive all Accrued Compensation. The
Severance Amount shall be paid to the Officer in a lump sum within thirty (30)
days of the execution of the Release and Confidentiality Agreement. The
Severance Amount shall be paid irrespective of the Officer's employment status
with any other organization or self-employment; provided, however, that if the
Officer should violate the terms of the Release and Confidentiality Agreement,
Westport shall be under no further obligation to continue the payments or
benefits hereunder.

            (c) Certain Welfare Benefits. For a number of months equal to
thirty-six (36) (the "Continuation Period"), Westport shall at its expense
continue on behalf of the Officer and his or her dependents and beneficiaries
the life insurance, disability, medical, dental and hospitalization coverages
and benefits provided to the Officer immediately prior to the Change in Control
or, if greater, the coverages and benefits provided at any time thereafter. The
coverages and benefits (including deductibles and costs) provided in this
Section 4(c) during the Continuation Period shall be no less favorable to the
Officer and his or her dependents and beneficiaries, than the most favorable of
such coverages and benefits referred to above. Westport's obligation hereunder
with respect to the foregoing coverages and benefits shall be reduced to the
extent that the Officer obtains any such coverages and benefits pursuant to a
subsequent employer's benefit plans, in which case Westport may reduce any of
the coverages or benefits it is required to provide the Officer hereunder so
long as the aggregate coverages and benefits of the combined benefit plans is no
less favorable to the Officer than the coverages and benefits required to be
provided hereunder. Neither this Section 6(c) nor any other provision of this
Agreement shall be interpreted so as to reduce any amounts otherwise payable, or
in any way diminish the Officer's rights as an Officer of Westport, whether
existing now or hereafter, under any benefit, incentive, retirement, stock
option, stock bonus, stock purchase plan, or any employment agreement or other
plan or arrangement.

            (d) Equity Grants. Immediately prior to a Change in Control, (i) all
options granted by Westport to the Officer shall be 100% vested and immediately
exercisable, and the exercise term thereof shall end upon the earlier of: the
first anniversary of the date of termination of employment and the end of the
original exercise term, and (ii) all restrictions shall lapse with respect to
all grants of restricted stock held by Officer.

                                       7
<PAGE>

         7. Excise Tax Limitation.

            (a) Gross-Up Payment. In the event it shall be determined that any
payment or distribution of any type to or for the benefit of the Officer, by
Westport, any Affiliate, any person who acquires ownership or effective control
of Westport or ownership of a substantial portion of Westport's assets (within
the meaning of Section 280G of the Code and the regulations thereunder) or any
affiliate of such Person, whether paid or payable or distributed or
distributable pursuant to the terms of this Agreement or otherwise (the "Total
Payments"), is or will be subject to the excise tax imposed by Section 4999 of
the Code or any interest or penalties with respect to such excise tax (such
excise tax, together with any such interest and penalties, are collectively
referred to as the "Excise Tax"), then the Officer shall be entitled to receive
an additional payment (a "Gross-Up Payment") in an amount such that after
payment by the Officer of all taxes (including any interest or penalties imposed
with respect to such taxes), including any income tax, employment tax or Excise
Tax, imposed upon the Gross-Up Payment, the Officer retains an amount of the
Gross-Up Payment equal to the Excise Tax imposed upon the Total Payments.
Notwithstanding the foregoing provisions of this Section 7(a), if it shall be
determined that the Officer is entitled to a Gross-Up Payment, but that the
Total Payments would not be subject to the Excise Tax if the Total Payments were
reduced by an amount that is less than 10% of the portion of the Total Payments
that would be treated as "parachute payments" under Section 280G of the Code,
then the amounts payable to the Officer under this Agreement shall be reduced to
the maximum amount that could be paid to the Officer without giving rise to the
Excise Tax (the "Safe Harbor Cap"), and no Gross-Up Payment shall be made to the
Officer. The reduction of the amounts payable hereunder, if applicable, shall be
made by reducing first the payment under Section 6(a), unless an alternative
method of reduction is elected by the Officer. For purposes of reducing the
Total Payments to the Safe Harbor Cap, only amounts payable under this Agreement
(and no other amounts) shall be reduced.

            (b) Determination by Accountant. All mathematical determinations,
and all determinations as to whether any of the Total Payments are "parachute
payments" (within the meaning of Section 280G of the Code), that are required to
be made under this Section, including determinations as to whether a Gross-Up
Payment is required, the amount of such Gross-Up Payment, the reduction of the
Total Payments to the Safe Harbor Cap, amounts relevant to the last sentence of
this Section 7(b), and the assumptions to be utilized in arriving at such
determinations, shall be made at Westport's expense by an independent nationally
recognized accounting firm selected by Westport (the "Accounting Firm"). The
Accounting Firm shall provide its determination (the "Determination"), together
with detailed supporting calculations and documentation to Westport and the
Officer by no later than ten (10) days following the Termination Date, if
applicable, or such earlier time as is requested by Westport or the Officer (if
the Officer reasonably believes that any of the Total Payments may be subject to
the Excise Tax). If the Accounting Firm determines that no Excise Tax is payable
by the Officer, it shall furnish the Officer and Westport with a written
statement that such Accounting Firm has concluded that no Excise Tax is payable
(including the reasons therefor) and that the Officer has substantial authority
not to report any Excise Tax on his or her federal income tax return. If a
Gross-Up Payment is determined to be payable, it shall be paid to the Officer
within twenty (20) days after the Determination (and all accounting calculations
and other material supporting the Determination) is delivered to Westport by the
Accounting Firm. Any determination by the Accounting Firm shall be binding upon
Westport and the Officer, absent manifest error. As a result of uncertainty in
the application of Section 4999 of the Code at the time of the Determination

                                       8
<PAGE>

by the Accounting Firm hereunder, it is possible that Gross-Up Payments not made
by Westport should have been made ("Underpayment"), or that Gross-Up Payments
will have been made by Westport which should not have been made
("Overpayments"). In either such event, the Accounting Firm shall determine the
amount of the Underpayment or Overpayment that has occurred. In the case of an
Underpayment, the amount of such Underpayment shall be promptly paid by Westport
to or for the benefit of the Officer. In the case of an Overpayment, the Officer
shall, at the direction and expense of Westport, take such steps as are
reasonably necessary (including the filing of returns and claims for refund),
follow reasonable instructions from, and procedures established by, Westport,
and otherwise reasonably cooperate with Westport to correct such Overpayment,
provided, however, that (i) the Officer shall not in any event be obligated to
return to Westport an amount greater than the net after-tax portion of the
Overpayment that he or she has retained or has recovered as a refund from the
applicable taxing authorities and (ii) this provision shall be interpreted in a
manner consistent with the intent to make the Officer whole, on an after-tax
basis, from the application of the Excise Tax, it being understood that the
correction of an Overpayment may result in the Officer repaying to Westport an
amount which is less than the Overpayment.

            (c) Internal Revenue Service Claims. The Officer shall notify
Westport in writing of any claim by the Internal Revenue Service that, if
successful, would require the payment by Westport of the Gross-up Payment. Such
notification shall be given as soon as practicable but no later than 10 business
days after the Officer is informed in writing of such claim and shall apprise
Westport of the nature of such claim and the date on which such claim is
requested to be paid. The Officer shall not pay such claim prior to the
expiration of the 30-day period following the date on which he or she gives such
notice to Westport (or such shorter period ending on the date that any payment
of taxes with respect to such claim is due). If Westport notifies the Officer in
writing prior to the expiration of such period that it desires to contest such
claim, the Officer shall:

                        (i) give Westport any information reasonably requested
            by Westport relating to such claim,

                        (ii) take such action in connection with contesting such
            claim as Westport shall reasonably request in writing from time to
            time, including, without limitation, accepting legal representation
            with respect to such claim by an attorney reasonably selected by
            Westport,

                        (iii) cooperate with Westport in good faith in order
            effectively to contest such claim, and

                        (iv) permit Westport to participate in any proceedings
            relating to such claim;

provided, however, that Westport shall bear and pay directly all costs and
expenses (including additional interest and penalties) incurred in connection
with such contest and shall indemnify and hold the Officer harmless, on an
after-tax basis, for any Excise Tax, income tax or employment tax (including
interest and penalties with respect thereto) imposed as a result of such
representation and payment of costs and expenses. Without limiting the foregoing
provisions of this Section 7(c),

                                       9
<PAGE>

Westport shall control all proceedings taken in connection with such contest
and, at its sole option, may pursue or forgo any and all administrative appeals,
proceedings, hearings and conferences with the taxing authority in respect of
such claim and may, at its sole option, either direct the Officer to pay the tax
claimed and sue for a refund or contest the claim in any permissible manner, and
the Officer agrees to prosecute such contest to a determination before any
administrative tribunal, in a court of initial jurisdiction and in one or more
appellate courts, as Westport shall determine; provided, however, that if
Westport directs the Officer to pay such claim and sue for a refund, Westport
shall advance the amount of such payment to the Officer, on an interest-free
basis, and shall indemnify and hold the Officer harmless, on an after-tax basis,
from any Excise Tax, income tax or employment tax (including interest or
penalties with respect thereto) imposed with respect to such advance or with
respect to any imputed income with respect to such advance; and further provided
that any extension of the statute of limitation relating to payment of taxes for
the taxable year of the Officer with respect to which such contested amount is
claimed to be due is limited solely to such contested amount. Furthermore,
Westport's control of the contest shall be limited solely to such contested
amount. Furthermore, Westport's control of the contest shall be limited to
issues with respect to which a Gross-up Payment would be payable hereunder and
the Officer shall be entitled to settle or contest, as the case may be, any
other issue raised by the Internal Revenue Service or any other taxing
authority.

         8. Nature of Rights. The Officer shall have the status of a mere
unsecured creditor of Westport with respect to his right to receive any payment
under this Agreement. This Agreement shall constitute a mere promise by the
Westport to make payments in the future of the benefits provided for herein. It
is the intention of the parties hereto that the arrangements reflected in this
Agreement shall be treated as unfunded for tax purposes and, if it should be
determined that Title I of ERISA is applicable to this Agreement, for purposes
of Title I of ERISA. Nothing in this Agreement shall prevent or limit the
Officer's continuing or future participation in any benefit, bonus, incentive or
other plan or program provided by Westport and for which the Officer may
qualify, nor shall anything herein limit or reduce such rights as the Officer
may have under any other agreements with Westport. Amounts which are vested
benefits or which the Officer is otherwise entitled to receive under any plan or
program of Westport shall be payable in accordance with such plan or program,
except as explicitly modified by this Agreement.

         9. Full Settlement. Westport's obligation to provide the payments and
benefits provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any set-off, counterclaim, recoupment,
defense or other claim, right or action which Westport may have against the
Officer or others. In no event shall the Officer be obligated to seek other
employment or take any other action by way of mitigation of the amounts payable
to the Officer under any of the provisions of this Agreement and such amounts
shall not be reduced whether or not the Officer obtains other employment except
as set forth in Section 6(c) with respect to certain welfare benefits. Westport
agrees to pay as incurred, to the full extent permitted by law, all legal fees
and expenses (collectively, "Legal Fees") which the Officer may reasonably incur
as a result of any contest (including as a result of any contest by the Officer
about the amount of any payment pursuant to this Agreement) by Westport, the
Officer or others of the validity or enforceability of, or liability under, any
provision of this Agreement or any guarantee of performance thereof, plus in
each case interest on any delayed payment at the applicable Federal rate
provided for in Section 7872(f)(2)(A) of the

                                       10
<PAGE>

Internal Revenue Code of 1986, as amended (the "Code"); provided, however, that
Westport shall not pay the Legal Fees: (A) to the extent they were incurred with
respect to a claim brought by the Officer in bad faith and/or (B) to the extent
they were incurred where a determination has been made (either by a court or as
part of a settlement agreement) that the Officer is not entitled to
substantially all the amounts claimed by Officer whether or not such claims were
made in bad faith.

         10. Protection of Westport's Business.

            (a) No Competition. Officer shall not, for twelve (12) months
following the Voluntary Termination of his employment, work as an employee or
independent contractor or become an investor or owner in or lender to any
business, corporation, partnership or other entity (a "Competing Business")
where such employment with, investment in or service to the Competing Business
would aid, entail or result in such Competing Business' competition with
Westport in any project or transaction of Westport of which Officer was aware or
should have been aware during the term of his employment with Westport.

            (b) No Hire of Other Officers or Contractors. Officer agrees that
for a period of twelve (12) months from and after the date following the
termination of his employment, whether for Cause or by Voluntary Termination or
by expiration of the Term or by Qualifying Termination or otherwise, he shall
not, directly or indirectly, as an employee of or consultant to any Person, or
for himself or on behalf of, or in connection with, any Person, solicit or
attempt to solicit, direct or take away any Person who was an employee, agent,
or contractor of Westport at any time during the twelve-month period prior to
the termination of Officer's employment or who is an employee, agent or
contractor for Westport during the twelve-month period following the termination
of Officer's employment; provided, however, that this provision shall not apply
to the solicitation or attempted solicitation of any Person known in the
industry in which Westport is engaged to have performed services in the industry
generally and not as an employee of any single entity in the industry. Westport
may waive the restriction contained in this Section 10(b) as to any employee at
any time, but any such waiver shall not be considered a waiver of the future
application of this provision nor shall it be considered a waiver as to any
employee other than the one to whom it applies.

         11. Confidentiality.

             (a) Confidential Information and Materials. All of the Confidential
Information and Materials, as defined herein, are and shall continue to be the
exclusive confidential property and trade secrets of Westport. Such Confidential
Information and Materials shall include only such information that is
proprietary to Westport and shall not include any information that becomes part
of the public domain through no fault of Officer. Confidential Information and
Materials have been or will be disclosed to Officer solely by virtue of his
employment with Westport and solely for the purpose of assisting him in
performing his duties for Westport. "Confidential Information and Materials"
refers to the non-public organization structure and ownership of Westport, its
shareholders, its advisors and advisors to its shareholders, its affiliates and
the affiliates of any of its shareholders and their advisors and all information
belonging to or used by Westport or Westport's clients or associates relating to

                                       11
<PAGE>

internal operations, procedures and policies, finances, income, profits,
business strategies, pricing, billing information, compensation and other
personnel information, client contacts, sales lists, employee lists,
geotechnical information of every sort and character, technology, land status,
exploration and acquisition plans and programs, costs, marketing plans,
developmental plans, drilling plans, inventions, computer program manuals,
computer programs, and computer system designs (to the extent such manuals,
programs and designs are created by or for Westport and are not off-the-shelf
manuals, programs and designs) and trade secrets of every kind and character,
whether or not they constitute a trade secret under applicable law and whether
developed by Officer during or after business hours.

             (b) Non-disclosure and Non-use. Officer may use Confidential
Information and Material while an employee of Westport and in the course of that
employment to the extent deemed necessary by the Board of Directors for the
performance of Officer's responsibilities or as otherwise required by law. Such
permission expires upon termination of his employment with the Company or on
notice from Westport. Officer shall not, either during or after his employment
with Westport, disclose any Confidential Information or Materials to any person,
firm, corporation, association or other entity for any reason or purpose unless
expressly permitted by Westport in writing or unless required by law to be
disclosed. Officer shall not use, in any manner other than to further Westport's
business, any Confidential Information or Materials. Upon termination of his
employment, Officer shall immediately return all Confidential Information or
Materials or other property of Westport, its associates or its potential
associates in his possession or control.

         12. Remedies.

             (a) Equitable Remedies. The service rendered by Officer to Westport
and the information disclosed to Officer during his employment are of a unique
and special character, and any breach of Sections 10 or 11 hereof will cause
Westport irreparable injury and damage which will be extremely difficult to
quantify. The parties agree that because of unquantified risks and intangibles
which are impossible to measure, Westport will be entitled to, in addition to
all other remedies available to it, injunctive relief to prevent a breach and to
secure the enforcement of all provisions of Sections 10 and 11. Injunctive
relief may be granted immediately upon the commencement of any such action
without notice to Officer, which notice Officer hereby specifically waives.

             (b) Arbitration. In the event any controversy arises with respect
to this Agreement, it shall be arbitrated in accordance with the rules and
procedures of the American Arbitration Association with the following
limitations:

                 (i) The laws of the State of Colorado shall be applied to the
interpretation and resolution of the controversy. The location of the
arbitration shall be in the Denver Metropolitan Area of Colorado.

                 (ii) The parties shall be entitled to conduct expedited
discovery proceedings in accordance with the Colorado Rules of Civil Procedure
and such rights of

                                       12
<PAGE>

discovery may be enforced by the appropriate court by filing a petition for
compliance, in regard to which the parties hereto agree to abide timely and
fully. The discovery period shall in no event exceed a period of sixty (60) days
from the date the arbitration response is filed by the responding party.

                 (iii) Arbitration procedures shall be conducted substantially
in accordance with the Rules of Civil Procedure in the State of Colorado and the
Rules of Evidence of said State.

                 (iv) The award of arbitration may be reduced to judgment in
accordance with the rules of Civil Procedure of the State of Colorado and/or the
rules or laws of any other jurisdiction and the Colorado Uniform Arbitration
Act.

                 (v) In the event one party willfully, after ten (10) days
notice of his failure or refusal, fails or refuses to comply timely with the
arbitration procedure, that party shall be deemed to have conclusively waived
its right to participate in the arbitration and the nondefaulting party may
either proceed to arbitration, the decision of which shall be binding upon the
defaulting party, or may proceed in an action in court.

                 (vi) The prevailing party in any arbitration may be entitled to
an award of attorneys' fees and all costs to be paid by the losing party in the
arbitration as determined by the arbitrators.

                 (vii) In the event a court of competent jurisdiction or panel
of arbitrators finds any of the provisions of this section 12(b) to be so
overbroad as to be unenforceable, it is the parties' intent that with respect to
such jurisdiction such provision be reduced in scope by the Court, but only to
the extent deemed necessary by the Court or arbitrators to render the provision
reasonable and enforceable, keeping in mind that it is the parties' intent to
give the Company the broadest possible legal protection.

                 (viii) In no event shall any monetary dispute between the
parties be arbitrated or litigated until there is an aggregated dollar amount of
not less than $10,000.00 in dispute.

         13. Miscellaneous.

             (a) Severability. Should a court or other body of competent
jurisdiction determine that any provision of this Agreement is excessive in
scope or otherwise invalid or unenforceable, such provision shall be adjusted
rather than voided, if possible, so that it is enforceable to the maximum extent
possible.

             (b) Withholding. All compensation and benefits to the Officer
hereunder shall be reduced by all federal, state, local and other withholdings
and similar taxes and payments required by applicable law. Westport may withhold
amounts due it from Officer from amounts due under this Agreement to Officer.

                                       13
<PAGE>

             (c) Entire Agreement; Modification; Waiver. This Agreement
represents the entire agreement between the parties and supersedes any prior
agreements between the parties, written or oral, with respect to the subject
matter covered hereby, including without limitation the Employment Agreement
between the Officer and Westport dated as of May 8, 2000. This Agreement may be
amended, modified, superseded or canceled, and any of the terms hereof may be
waived, only by a written instrument executed by each party hereto or, in the
case of a waiver, by the party waiving compliance. The failure of any party at
any time or times to require performance of any provision hereof shall not
affect such party's right at a latter time to enforce the same. No waiver by any
party of the breach of any provision contained in this Agreement, whether by
conduct or otherwise, in any one or more instances, shall be deemed to be or
construed as a further or continuing waiver of any such breach or of any other
term of this Agreement.

             (d) Applicable Law. This Agreement shall be construed under and
governed by the laws of the State of Colorado.

             (e) Successors and Assigns. This Agreement shall be binding upon,
and shall issue to the benefit of, Westport's successors and assigns and the
Officer's heirs and assigns.

             (f) Nontransferability by Officer. Neither this Agreement nor any
right or interest hereunder shall be assignable or transferable by the Officer,
his or her beneficiaries or legal representatives, except by will or by the laws
of descent and distribution.

             (g) Notices. All notices and other communications under this
Agreement shall be in writing and shall be given by hand delivery, or
first-class mail, certified or registered with return receipt requested, or by
commercial overnight courier or by facsimile and shall be deemed to have been
duly given upon hand delivery, three (3) days after mailing, the first business
day following delivery to a commercial overnight courier or upon receipt of a
facsimile, addressed as follows

         If to the Company:

                           Westport Resources Corporation.
                           410 Seventeenth Street, #2300
                           Denver, Colorado 80202
                           Attn:  General Counsel
                           Facsimile:  (303) 573-5609

         with a copy to:

                           Dr. Richard J. Haas Partners
                           Attention:  Mr. Michael Russell
                           Dukes Court
                           32 Duke Street St. James
                           London UK  SW1Y 6DF
                           Facsimile:  011-44-207-321-5242

                                       14
<PAGE>

                           Equitable Resources Energy Co.
                           One Oxford Centre, Suite 3300
                           Pittsburgh, PA  15219
                           Attention:  Mr. Murry Gerber
                           Facsimile:  (412) 553-5731

                           Belfer Management, LLC
                           767 Fifth Avenue, 46th Floor
                           New York, NY 10153
                           Attention:  Mr. Robert Belfer
                           Facsimile: (212) 644-2396

         If to Officer:

                           Donald D. Wolf
                           16401 Rocky Point Lane
                           Morrison, Colorado 80465
                           Facsimile: 303-573-5609

Any party may change such party's address for notices by notice given pursuant
to this Section 13(g).

             (h) Survival of Westport's Obligation. Westport's obligations
hereunder shall not be terminated by reason of any liquidation, dissolution,
bankruptcy, cessation of business or similar event relating to Westport. This
Agreement shall not be terminated by any merger or consolidation or other
reorganization of Westport. In the event any such merger, consolidation or
reorganization shall be accomplished by transfer of stock or by transfer of
assets or otherwise, the provisions of this Agreement shall be binding upon and
insure to the benefit of the surviving or resulting corporation or person. This
Agreement shall be binding upon and inure to the benefit of the executors,
administrators, heirs, successors and assigns of the parties; provided, however,
that except as provided in this Section, this Agreement shall not be assignable
either by Westport or by Officer.

             (i) Counterparts. This Agreement may be executed in one or more
counterparts, all of which taken together shall constitute one and the same
Agreement.

                                       15
<PAGE>

             IN WITNESS WHEREOF, the parties have executed this Agreement as of
April 1, 2002.

                                WESTPORT RESOURCES CORPORATION

                                By: /s/ Barth E. Whitham
                                   ------------------------------
                                Name:  Barth E. Whitham
                                Title: President

                                OFFICER:

                                /s/ Donald D. Wolf
                                ---------------------------------
                                Name:  Donald D. Wolf

                                       16

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