Document:

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            FIRST AMENDMENT TO THE LEASE BETWEEN CREDIT SUISSE FIRST
             BOSTON CORPORATION (CSFB) ("TENANT") AND TM PARK AVENUE
                           ASSOCIATES LP ("LANDLORD")
                       DATED AUGUST 16, 2000 (THE "LEASE")

     WHEREAS, Landlord and Tenant entered into the Lease dated as of August 16,
2000, which Landlord and Tenant desire to amend as of December 8, 2000.

     THE LEASE IS HEREBY AMENDED AS FOLLOWS:

     1.   Article 1 of the Lease is hereby deleted and in its place is
          substituted the following:

          SECTION 1.01. Landlord leases to Tenant, and Tenant hires from
Landlord, and upon and subject to the covenants, agreements, Terms, provisions
and conditions of this Lease, for the Term hereinafter stated, that portion of
the twenty-story building (hereinafter called the "Building") known as 315 Park
Avenue South, New York, New York, (hereinafter called the "Building") consisting
of the entire Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Twelfth,
Thirteenth, Fourteenth and Fifteenth Floors, portions of the Lobby Floor (the
"Tenant's Lobby") as set forth on the diagram marked Exhibit A attached hereto
and a portion of the Basement Floor as set forth on the diagram marked Exhibit
A-1 attached hereto (except for common areas, including, without limitation,
areas devoted to elevator shafts and conduits for mechanical systems, which
common areas Tenant shall have non-exclusive right to use with other Building
occupants but excluding Tenant's dedicated shaft space. Such leased Premises,
together with all fixtures, equipment, installations and appurtenances which at
the commencement of or during the Term of this Lease are thereto attached
(except items not deemed to be included therein and removable by Tenant as
provided in Article 4 of this Lease) are hereinafter called the "Premises". The
plot of land on which the Building is erected is hereinafter called the "Land".
This agreement is called this "Lease".

          SECTION 1.02. (a) The Commencement Dates of the respective floors of
the Premises are as follows:

<Table>
<Caption>
     FLOORS                                      COMMENCEMENT DATE
<S>                                              <C>
     3, 5, 6, 7, 12, 13, 14, 15                  September 1, 2000
     4                                           September 18, 2000
     8                                           October 2, 2000
     2                                           October 12, 2000
     Portion of Lobby (4,010 sq. ft.)            October 16, 2000
     Portion of Lobby (9,121 sq. ft.)            December 8, 2000
     Portion of Basement (11,038 sq. ft.)        December 8, 2000
</Table>

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Whenever the phrase "Commencement Date" appears in the Lease it shall refer to
the respective dates set forth above in this Section. This Lease has commenced
on the dates set forth above (the "Commencement Date") and shall expire unless
same shall sooner cease or be terminated as hereinafter provided or pursuant to
law on April 30, 2017 (such term being hereinafter referred to as the "Term").

     (b) The 9,121 square foot portion of the Lobby and the 11,038 square foot
portion of the Basement shall be collectively referred to as the "New Space".

          SECTION 1.03. The rent reserved under this Lease for the Term shall be
a fixed annual rent (hereinafter called the "Fixed Rent") as follows:

          (a) At the annual rate of $9,353,502 per annum for the period from and
including the Commencement Date to and including September 30, 2005 and at such
rate to be paid in equal monthly installments of $779,458.50 each, in advance,
on the last day of each and every prior calendar month during the entirety of
such period (plus such Additional Rent and other charges as shall become due and
payable hereunder) by Federal Funds wire transfer, to an account designated in
writing by Landlord;

          (b) At the annual rate of $10,166,850 per annum for the period from
and including October 1, 2005 to and including September 30, 2010 and at such
rate to be paid in equal monthly installments of $847,237.50 each, in advance,
on the last day of each and every prior calendar month during the entirety of
such period (plus such Additional Rent and other charges as shall become due and
payable hereunder), by Federal Funds wire transfer, to an account designated in
writing by Landlord;

          (c) At the annual rate of $10,980,198 per annum for the period from
and including October 1, 2010 to and including September 30, 2015 and at such
rate to be paid in equal monthly installments of $915,016,50 each, in advance,
on the last day of each and every prior calendar month during the entirety of
such period (plus such Additional Rent and other charges as shall become due and
payable hereunder) by Federal Funds wire transfer, to an account designated in
writing by Landlord; and

          (d) At the annual rent of $ 11,183,535 per annum for the period from
and including October 1, 2015 to and including April 30, 2017 and at such rate
to be paid in equal monthly installments of $ 931,961.25 each in advance on the
last day of each and every prior calendar month during the entirety of such
period (plus Additional Rent and other charges as shall become due and payable
hereunder) to an account designated in writing by Landlord.

          SECTION 1.04. Tenant agrees promptly to pay the Fixed Rent, Additional
Rent and other charges herein reserved as and when the same shall become due and
payable, without demand thereof, and without any set-off or deduction whatsoever
except as expressly provided in this Lease and to keep, observe and perform, and
to permit no violation of, each and every of the covenants, agreements, terms,
provisions and conditions herein contained on the part and on behalf of Tenant
to be kept, observed and performed. Any Fixed Rent payments that are due under
this Lease shall, if not received by Landlord by

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the fifth day after such rent is due, bear a three (3%) percent surcharge for
the late payment and interest at the Default Rate; provided, however, that if a
monthly payment is inadvertently late no more than once in any twelve month
period and is paid within two (2) days after notice from Landlord to Tenant, the
three (3%) percent surcharge shall not apply to that late payment.

          SECTION 1.05. Additional Rent shall mean all charges owed pursuant to
Sections 16.04, 19.01, 21.02, 21.03, 21.04, 22.06, 23.02, 23.03 and 23.04 and
such other Sections of similar purport.

          SECTION 1.06. If, by reason of any of the provisions of this Lease,
the Term expires on any date other than the last day of a calendar month (except
if the Term Terminates by reason of Tenant's default hereunder), the Fixed Rent
and Additional Rent for such calendar month shall be equitably prorated. If the
Commencement Date of the respective floors of the Premises of this Lease are on
any day other than the first of a calendar month, the Fixed and Additional Rent
for those floors shall be prorated for that first month.

          SECTION 1.07. For all purposes hereof, it is agreed that the Premises
consists of 203,337 square feet consisting of 16,288 square feet on each of the
second through eighth floors and the twelfth through fifteenth floors and 13,131
square feet in the Tenant's Lobby and 11,038 square feet in the Basement.

          SECTION 1.08. Notwithstanding any other provisions of the Lease,
Tenant will not be obligated to make any payments of the Fixed Rent for: (a) the
two month period commencing with the Commencement Date of the applicable floors
and (b) the month of September, 2003. During the months of October 1, 2005
through September 30, 2006, Tenant shall receive a rent credit of $63,603.47 per
month (or, if Tenant shall have expended less than $483,179 in order to remove
the linoleum or other floor tiles in the Premises, and if all such linoleum or
other floor tiles have not been removed, the credit will be reduced by one
twelfth (1/12) of $483,179 less the amount so expended). Tenant shall pay, upon
the execution of this Lease, the Fixed Rent for the third month after the
Commencement Date, in respect to each applicable floor. Tenant shall pay, upon
the execution of this First Amendment, the sum of $77,276.16, which represents
the Fixed Rent for the month of February 2001 for the New Space.

     2.   Section 3.01 is hereby amended by adding the following sentence to the
          end of the Section: "Notwithstanding anything above to the contrary,
          Tenant may use (i) the Basement only for storage and the placement of
          mechanical equipment; and (ii) Tenant may use the Tenant's Lobby for a
          conference facility and other purposes ancillary to its office use".

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     3.   Section 3.05 is hereby amended as follows:
          The last sentence is deleted and replaced with "Tenant may place such
          exterior signage on the exterior of the First Floor of the Building as
          Landlord in its reasonable discretion shall allow. Tenant shall
          maintain and repair the windows on the exterior of the Tenant's Lobby.
          Except as provided in the Lease, Landlord will not allow any exterior
          signage on the Building's North and West facades."

     4.   Section 3.06 is hereby amended as follows:
          The last sentence of the Section is deleted and in its place shall
          appear the following:
               "The Park Avenue elevators shall be re-programmed, as soon as is
          practical, so that when each specific elevator is turned over to
          Tenant it shall be able to service all floors of the Building. The
          cost of the re-programming will be borne by the Tenant. One half of
          this cost (not to exceed $350,000) shall be returned to the Tenant in
          the form of a rent credit to be applied in sixty (60) equal monthly
          installments starting in November 2005 and ending in October 2010. In
          computing the amount of the credit, the cost will be increased by
          applying a Six and a half (6.5%) percent annual interest factor. The
          two most westerly of the Park Avenue elevators shall be dedicated
          exclusively for Tenant's use (the cost of providing the openings on
          each floor shall be totally borne by the Tenant). When the Tenant
          leases fourteen (14) floors in the Building, Landlord shall dedicated
          a third elevator for Tenant's exclusive use. The other elevators will
          only open on the floors the Tenant does not occupy. For the purpose of
          determining when Tenant is entitled to receive additional dedicated
          elevators, neither the Tenant's Lobby nor the Basement shall
          constitute floors. The Landlord reserves the right at all times to use
          all of the Park Avenue elevators that open on the Basement floors to
          obtain access to the Basement."

     5.   Section 16.03 is amended by adding the following sentences at the end
          of the Section: "Tenant has decided to install supplemental air
          conditioning units throughout the Premises and to install two cold air
          drying units on the roof at its own cost and expense Landlord shall
          have no responsibility to repair or maintain such supplemental units
          or systems. Tenant shall have reasonable right of access to the roof
          for purposes of maintenance and repair of such equipment.

     6.   Section 21.04 of the Lease shall be amended by deleting the amount
          $41,978.29 in line 3 of the Section and replacing it with the amount
          $46,598.06.

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     7.   Section 22.04(g) shall be amended by adding the following sentence:
          "Tenant may only sublet or assign the Basement and Lobby Floor in
          conjunction with a sublease or assignment of the Tenant's entire
          Premises."

     8.   Section 23.01(d) shall be amended by deleting the words fifty-six
          percent (56%) and replacing it with "62.163%".

     9.   Section 23.01(h) is amended by deleting the "215,444 square feet" in
          lines 3 and 5 and substituting "203,337 square feet"; furthermore, in
          line 5 the amount $107,722 is deleted and replaced with $101,668.50.

     10.  As to the New Space, Section 27.06 is amended to delete "Insignia ESG
          and Company" and to substitute in instead "CSFB Realty Services".

     11.  Section 27.28 of the Lease is hereby deleted.

     12.  In regard to the New Space the following Sections of the Lease shall
          not apply:

               a. Section 7.01 as to the Basement
               b. Section 7.02
               c. Section 16.01 as it relates to the heating ventilation air
                  conditioning system.
               d. Section 16.03
               e. Exhibit C and Exhibit F.
               f. Landlord shall have no obligation to create demising walls in
                  the Lobby floor for Tenant.

     13.  Except as expressly set forth above, the Lease is unamended, unchanged
          and in full force and effect in regard to all of its terms.

                                        LANDLORD:
                                        TM PARK AVENUE ASSOCIATES LP

                                        By: /s/ Steve Mullins
                                           -----------------------------------
                                               NAME: STEVE MULLINS
                                               TITLE: GENERAL PARTNER

                                        TENANT:
                                        CREDIT SUISSE FIRST BOSTON CORPORATION

                                        By:
                                            --------------------------------
                                            NAME:
                                            TITLE:

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State of New York  )
County of New York ) ss.:

On the 26 day of December in the year 2000 before me, the undersigned,
personally appeared George Twill, personally known to me a Notary Public of
the Sate of New York or proved to me on the basis of satisfactory evidence to
be the individual(s) whose name(s) is (are) subscribed to the within
instrument and acknowledged to me that he/she/they executed the same in
his/her/their capacity(ies), and that by his/her/their signature(s) on the
instrument, the individual(s), or the person upon behalf of which the
individual(s) acted, executed the instrument.

/s/ [ILLEGIBLE]
-----------------------------
                                                            [SEAL ILLEGIBLE]

State of New York  )
County of New York ) ss.:

On the _______ day of December in the Year 2000 before me, a Notary Public in
the State of New York, the undersigned, personally appeared
_________________________, personally known to me a Notary Public of the State
of New York or proved to me on the basis of satisfactory evidence to be the
individual(s) whose name(s) is (are) subscribed to the within instrument and
acknowledged to me that he/she/they executed the same in his/her/their
capacity(ies), and that by his/her/their signature(s) on the instrument, the
individual(s), or the person upon behalf of which the individual(s) acted,
executed the instrument.

-----------------------------

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     7.   Section 22.04(g) shall be amended by adding the following sentence:
          "Tenant may only sublet or assign the Basement and Lobby Floor in
          conjunction with a sublease or assignment of the Tenant's entire
          Premises."

     8.   Section 23.01(d) shall be amended by deleting the words fifty-six
          percent (56%) and replacing it with "62.163%".

     9.   Section 23.01(h) is amended by deleting the "215,444 square feet" in
          lines 3 and 5 and substituting "203,337 square feet"; furthermore, in
          line 5 the amount $107,722 is deleted and replaced with $101,668.50.

     10.  As to the New Space, Section 27.06 is amended to delete "Insignia ESG
          and Company" and to substitute in instead "CSFB Realty Services".

     11.  Section 27.28 of the Lease is hereby deleted.

     12.  In regard to the New Space the following Sections of the Lease shall
          not apply:

               a. Section 7.01 as to the Basement
               b. Section 7.02
               c. Section 16.01 as it relates to the heating ventilation air
                  conditioning system.
               d. Section 16.03
               e. Exhibit C and Exhibit F.
               f. Landlord shall have no obligation to create demising walls in
                  the Lobby floor for Tenant.

     13.  Except as expressly set forth above, the Lease is unamended, unchanged
          and in full force and effect in regard to all of its terms.

                                        LANDLORD:
                                        TMPARK AVENUE ASSOCIATES LP

                                        By: /s/ Steve Mullins
                                            -------------------------------
                                            NAME: STEVE MULLINS
                                            TITLE: GENERAL PARTNER

                                        TENANT:
                                        CREDIT SUISSE FIRST BOSTON CORPORATION

                                        By:
                                            --------------------------------
                                            NAME:
                                            TITLE:

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State of New York  )
County of New York ) ss.:

On the 27 day of December in the year 2000 before me, the undersigned,
personally appeared Stephen Mullins, personally known to me a Notary Public of
the Sate of New York or proved to me on the basis of satisfactory evidence to be
the individual(s) whose name(s) is (are) subscribed to the within instrument and
acknowledged to me that he/she/they executed the same in his/her/their
capacity(ies), and that by his/her/their signature(s) on the instrument, the
individual(s), or the person upon behalf of which the individual(s) acted,
executed the instrument.

/s/ Maria Vullis                [SEAL]
-----------------------------

State of New York  )
County of New York ) ss.:

On the______ day of December in the Year 2000 before me, a Notary Public in the
State of New York, the undersigned, personally appeared _____________________,
personally known to me a Notary Public of the State of New York or proved to me
on the basis of satisfactory evidence to be the individual(s) whose name(s) is
(are) subscribed to the within instrument and acknowledged to me that
he/she/they executed the same in his/her/their capacity(ies), and that by
his/her/their signature(s) on the instrument, the individual(s), or the person
upon behalf of which the individual(s) acted, executed the instrument.

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                                                                   Exhibit 10.30

                   PURCHASE AGREEMENT AND ESCROW INSTRUCTIONS

                              H. G. FENTON COMPANY,
                            A CALIFORNIA CORPORATION

                                    "SELLER"

                              BIOSITE INCORPORATED,
                             A DELAWARE CORPORATION

                                     "BUYER"

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                   PURCHASE AGREEMENT AND ESCROW INSTRUCTIONS

         THIS PURCHASE AGREEMENT AND ESCROW INSTRUCTIONS ("Agreement"), dated as
of December 7, 2001, is between H. G. FENTON COMPANY, a California corporation
which acquired title as H. G. Fenton Material Company ("Seller"), and BIOSITE
INCORPORATED, a Delaware corporation ("Buyer"). This Agreement is entered into
with reference to the recitals set forth in Article 1 and constitutes (i) a
contract of purchase-and-sale between the parties (which Seller intends to
convert into a tax-deferred exchange), and (ii) escrow instructions to STEWART
TITLE OF CALIFORNIA, INC. ("Escrow Holder"), the consent of which appears at the
end of this Agreement.

                               ARTICLE 1. RECITALS

         1.1      THE LAND. Seller is the owner of the real property consisting
of approximately 34.7 gross acres in the Carroll Canyon area of San Diego,
California ("Land"), which real property currently encompasses portions of
Parcels 1, 2 and 3 of Parcel Map No. 17983, filed in the Office of the County
Recorder of San Diego County on January 30, 1998. The Land is depicted as Lots 1
through 10 of Fenton Technology Park as shown on the Tentative Map (defined in
Article 2 below, as are other initially capitalized terms not defined when first
used). The parties contemplate that Seller will first record the Interim Map,
which will consolidate Lots 1 through 10 shown on the Tentative Map into five or
more lots or parcels as to which all building rights will be restricted or
relinquished, but without dedication for public use of the two cul-de-sacs
currently shown on the Tentative Map. The parties also contemplate that, several
months after recordation of the Interim Map and using the City's substantial
conformance review process, the Final Map will be approved and recorded, in the
same form (and with the same number and configuration of lots) as the Interim
Map, but with the building restriction rescinded, so that the Land has become
five or more buildable lots or parcels. The Land is a portion of the Carroll
Canyon Land. The Land to be conveyed hereunder includes all right, title and
interest of Seller therein, including, without limitation, all easements,
appurtenances, privileges, rights, profits and preferences, together with all
intangible rights, warranties, guaranties, contract rights and/or other claims,
permits and licenses, related to, arising out of or benefitting, the real
property comprising the Land, to the extent of Seller's interest therein and to
the extent assignable, excluding, however, any rights reserved by Seller as
declarant under the CC&Rs or in Seller's Grant Deed (as those terms are defined
below).

         1.2      THE BUSINESS PARK. The Land is part of Seller's planned
development known as Fenton Technology Park ("Business Park"), which includes
portions of the Carroll Canyon Land and is depicted on EXHIBIT A attached hereto
("Site Plan"). The Business Park will comprise twenty-four (24) buildable lots
and associated open space areas, and is being developed pursuant to the
Entitlements, which Seller anticipates will be approved in the calendar fourth
quarter of 2001. Seller anticipates that the Entitlement Approval Conditions
will require that Seller construct the Infrastructure Improvements including,
without limitation, the Camino Santa Fe Improvements.

         1.3      INTENTION OF THE PARTIES. Buyer wishes to purchase the Land
from Seller, in order to use all of the Land as Buyer's corporate headquarters
and as the site of its San Diego operations. Buyer's intended use of the Land
fits Seller's goals for the overall Business Park, and Seller is accordingly
willing to sell the Land to Buyer, on the terms and subject to the conditions of
this Agreement.

                             ARTICLE 2. DEFINITIONS

         2.1      DEFINITIONS. Unless the context otherwise indicates, whenever
used in this Agreement:

                  2.1.1    "ADDITIONAL DEPOSITS" means the First Additional
Deposit and the Second Additional Deposit.

                  2.1.2    "ADTs" means average daily trips, as used by City in
measuring and authorizing traffic generation caused by development.

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                  2.1.3    "ACCEPTABLE ENTITLEMENT APPROVAL CONDITIONS" means
those Entitlement Approval Conditions that Seller anticipates may be imposed by
City as conditions to approval of the Entitlements and that would be acceptable
to Seller, as set forth on EXHIBIT D.

                  2.1.4    "ASSESSMENT DISTRICT" means an assessment district or
Community Facilities District that may be established by Seller pursuant to
Paragraph 7.5, either before or after the Close of Escrow, to finance the cost
of constructing some or all of the Seller Improvements.

                  2.1.5    "ASSESSMENT DISTRICT CREDIT" means an amount to
compensate Buyer for the Land's allocable assessment if Seller elects to form an
Assessment District that includes the Land. The Assessment District Credit may
be determined in time to be applied as a credit against the Purchase Price, or
it may be payable by Seller to Buyer following the Close of Escrow, as set forth
in Paragraph 7.5 below.

                  2.1.6    "ASSIGNMENT OF WARRANTIES AND INTANGIBLE RIGHTS"
means an instrument in the form attached as EXHIBIT E.

                  2.1.7    "BUSINESS DAY" means any day when City's
administration offices are open for the transaction of business by members of
the general public.

                  2.1.8    "BUYER'S PROJECT" means Buyer's intended development
of the Land.

                  2.1.9    "CAMINO SANTA FE IMPROVEMENTS" means the construction
of Camino Santa Fe and the "loop" road depicted on the Site Plan.

                  2.1.10   "CARROLL CANYON LAND" means the real property owned
by Seller that will be included within the Business Park or be dedicated for the
Camino Santa Fe right of way or to satisfy other Entitlement Approval
Conditions.

                  2.1.11   "CASH" means (i) currency, or (ii) a check(s),
currently dated, payable to Escrow Holder and honored upon presentation for
payment or otherwise constituting immediately available funds, or (iii) if
Escrow Holder requires or if the party depositing funds so desires, funds
wire-transferred into Escrow Holder's general escrow account(s).

                  2.1.12   "CC&RS" means the Declaration Establishing Covenants,
Conditions and Restrictions and Grants of Easements for Fenton Technology Park,
in the form prepared by Seller and delivered to Buyer pursuant to Paragraph 7.2.

                  2.1.13   "CITY" means the City of San Diego, California.

                  2.1.14   "CLOSE OF ESCROW" or "CLOSING" means the date
Seller's Grant Deed is filed for record with the County Recorder of San Diego
County, conveying the Land from Seller to Buyer.

                  2.1.15   "CLOSING DATE" means a date which is thirty (30) days
following Buyer's receipt of the latest to be delivered of (i) Seller's written
notification of its intent to effect the Closing, (ii) the Grading
Certifications, and (iii) Seller's delivery of the notice specified in Paragraph
6.1.5. The currently anticipated Closing Date is July 30, 2002. The Closing Date
is subject to extension by Seller to no later than the Latest Closing Date
pursuant to Paragraph 6.2 below.

                  2.1.16   "CONTINGENCY DATE" means the date which is the later
to occur of (i) December 14, 2001, or (ii) ten (10) Business Days after Buyer's
receipt of the CC&Rs.

                  2.1.17   "COUNTY" means the County of San Diego, California.

                  2.1.18   "DEPOSITS" means the Escrow Opening Deposit and the
Additional Deposits.

                                      -2-
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                  2.1.19   "DEVELOPMENT DECLARATION" means the Declaration
Establishing Covenants, Conditions and Restrictions in the form of EXHIBIT F
attached hereto.

                  2.1.20   "ENTITLEMENT APPROVAL NOTICE" means written notice
from Seller to Buyer and Escrow Holder, to be sent by Seller not later than
January 31, 2002, certifying that (i) City's City Council has approved the
Entitlements, and (ii) Seller has approved the Entitlement Approval Conditions
pursuant to Paragraph 6.1.3 below.

                  2.1.21   "ENTITLEMENT APPROVAL CONDITIONS" means the payment
or construction obligations that are imposed on Seller by City as conditions to
approval of the Entitlements.

                  2.1.22   "ENTITLEMENTS" means the Tentative Map, the PDP, and
any other land use approvals necessary to authorize the recordation of the
Interim and Final Maps and the development of the Business Park.

                  2.1.23   "ESCROW" means the escrow created hereby.

                  2.1.24   "ESCROW HOLDER" means Stewart Title of California,
Inc.

                  2.1.25   "ESCROW OPENING DATE" means the date upon which
Escrow Holder has received counterparts of this Agreement signed by both Buyer
and Seller.

                  2.1.26   "ESCROW OPENING DEPOSIT" means the sum of Two Hundred
Fifty Thousand Dollars ($250,000), which shall be delivered by Buyer to Escrow
Holder within one Business Day after the Escrow Opening Date and which shall be
applicable to the Purchase Price.

                  2.1.27   "EXCHANGE" means an exchange qualifying for
nonrecognition of gain under Internal Revenue Code Section 1031 and the
applicable provisions of the California Revenue and Taxation Code.

                  2.1.28   "FINAL MAP" means a final subdivision map recorded in
the Official Records in substantial conformance to the Tentative Map and the
Site Plan, in the same form and content (and with the same number and
configuration of lots) as the Interim Map but without any relinquishment of
building rights as to the Land.

                  2.1.29   "FIRST ADDITIONAL DEPOSIT" means the sum of Two
Hundred Fifty Thousand Dollars ($250,000), to be delivered by Buyer prior to the
Contingency Date to evidence satisfaction of the Feasibility Conditions.

                  2.1.30   "GENERAL AND SPECIAL REAL ESTATE TAXES" means all
real property taxes and assessments levied against the Land evidenced by the
secured tax bill issued by the Tax Collector of the County.

                  2.1.31   "GRADING CERTIFICATIONS" means written certifications
from (i) Seller's soils consultant, certifying to Buyer that the grading of the
Land has been completed in substantial conformance with the project soils report
and grading specifications for the Business Park, and (ii) Seller's civil
engineer, certifying to Buyer: (x) that the lots comprising the Land have been
graded in substantial conformance with the grading plans (which have been
prepared for Seller as part of the reclamation of the Carroll Canyon Land, and
not in connection with a City-issued grading permit); and (y) the Net Salable
Area of the Land in its as-graded condition. The Grading Certifications shall
not reflect any material deviations from the soils reports and grading plans and
specifications that are not approved or deemed approved by Buyer in accordance
with Paragraph 7.4.

                  2.1.32   "HAZARDOUS MATERIALS" means any substance, material
or other thing regulated by or pursuant to any federal, state or local statute
or ordinance by reason of its potential for harm to human health or the
environment, or because of its flammability, toxicity, reactivity or
corrosiveness, including but not limited to those substances defined as
"hazardous substances", "hazardous materials", or "toxic substances"

                                      -3-
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in the Comprehensive Environmental Response, Compensation and Liability Act of
1980, as amended, 42 U.S.C. Section 9601 et seq.; or the Hazardous Materials
Transportation Act, 49 U.S.C. Section 1801 et seq.; or the Resource Conservation
and Recovery Act, 42 U.S.C. Section 6901 et seq.; and also including those
substances defined as "hazardous wastes" in Section 25117 of the California
Health & Safety Code or as "hazardous substances" in Section 25316 of the
California Health & Safety Code; in the regulations adopted and publications
promulgated pursuant to all such current and future federal and state laws and
local ordinances; and those chemicals to which reference is made in the Safe
Drinking Water and Toxic Enforcement Act of 1986, Section 25249.5 et seq. of the
California Health & Safety Code.

                  2.1.33   "INFRASTRUCTURE IMPROVEMENTS" means the improvements
required by the Entitlement Approval Conditions, which Seller anticipates will
include construction of the Camino Santa Fe Improvements, plus all associated
utilities. The Infrastructure Improvements are part of the Seller Improvements.

                  2.1.34   "INTERIM MAP" means a final subdivision map recorded
in the Official Records, consolidating Lots 1 though 10 shown on the Tentative
Map into five or more lots or parcels which are restricted from being built
upon, but which are in all other respects legally conveyable lots or parcels in
accordance with the California Subdivision Map Act and applicable law.

                  2.1.35   "LATEST CLOSING DATE" means January 31, 2003, which
shall be extended day-for-day, to a maximum extension of six (6) months, for
each day of Unavoidable Delay that is caused by restrictions on grading or other
Pre-Closing Improvements incident to storm-water runoff requirements.

                  2.1.36   "NATURAL HAZARD DISCLOSURE" means the disclosure
required to be delivered pursuant to the Natural Hazard Disclosure Act,
California Government Code Sections 8589.3, 8589.4, and 51183.5, and California
Public Resources Code Sections 2621.9, 2694, and 4136.

                  2.1.37   "NET SALABLE AREA" means the gross area of the Land,
minus (i) slope areas beyond the initial three feet (3') of slope (which will be
included in Net Salable Area), and (ii) the open space area in the southeast
portion of the Land surrounding the SDG&E power poles, as shown on the Site
Plan. The term Net Salable Area shall include those areas shown on the Site Plan
as cul-de-sacs off the loop road, and the access easements contemplated in
Paragraph 1.1. The Net Salable Area shall be certified to the parties and to
Escrow Holder in the Grading Certification from Seller's civil engineer.

                  2.1.38   "OFFICIAL RECORDS" means the Official Records of the
County Recorder of the County.

                  2.1.39   "PDP" means City of San Diego Planned Development
Permit No. 98-1199, being processed by Seller with City as one of the
Entitlements.

                  2.1.40   "PERMITTED EXCEPTIONS" means each of the following:
(i) those covenants, conditions, reservations, restrictions, easements and other
matters (excepting taxes, deeds of trust or other liens, and LIS PENDENS
notices) that are listed as exceptions to coverage in the Pro Forma Title Policy
approved by Buyer no later than the Contingency Date; (ii) all easements,
dedications and other matters shown on the Tentative Map or Final Map; (iii) the
PDP; (iv) the matters reserved or excepted in Seller's Grant Deed; and (v) the
CC&Rs in the form provided to Buyer prior to expiration of the Contingency Date,
and any revisions thereto which are either reasonably approved by Buyer or do
not materially affect the development, use, or value of the Land.

                  2.1.41   "PRE-CLOSING IMPROVEMENTS" means that portion of the
Seller Improvements comprising the grading of the Land in substantial
conformance with the project soils report for the Business Park and the grading
plans. Completion of the Pre-Closing Improvements shall be conclusively
evidenced by Seller's delivery of the Grading Certifications.

                  2.1.42   "PRELIMINARY REPORT" means the preliminary title
report of the Land issued by Title Insurer as of July 26, 2001, under Order No.
01-0207326A.

                                      -4-
<Page>

                  2.1.43   "PRO FORMA TITLE POLICY" means a pro forma CLTA
owner's policy of title insurance, reflecting the description of the Land
following recordation of the Final Map and based on the Preliminary Title
Report. The Pro Forma Title Policy may reflect deletion or endorsement of
certain matters shown in the Preliminary Report that would otherwise affect the
Land following recordation of the Final Map, but Seller shall have no obligation
with respect to such matters (or other endorsements) except to the extent Seller
specifically undertakes such obligation.

                  2.1.44   "PROPERTY DOCUMENTS" means each of the following: (i)
Vesting Tentative Map/PDP Grading Plan prepared by Rick Engineering and revised
as of August 10, 2001; (ii) September 2001 draft Design Guidelines for the
Business Park; (iii) Geotechnical Investigation of the Carroll Canyon Land
prepared by Geocon, Inc. as dated July 30, 2001; (iv) Draft Environmental Impact
Report dated March 16, 2001, with appendices, Volumes I and II; and (v) the Pro
Forma Title Policy.

                  2.1.45   "PURCHASE PRICE" means the amount payable by Buyer to
Seller for the Land, which shall be $24.50 per square foot of Net Salable Area
of the Land. Based on the parties' anticipation that the Net Salable Area will
be 25.8 acres or 1,123,848 square feet, the Purchase Price is expected to be
$27,534,276. After Buyer's approval of the Grading Certifications, the parties
shall jointly advise Escrow Holder in writing of the actual Purchase Price.

                  2.1.46   "SECOND ADDITIONAL DEPOSIT" means the sum of Five
Hundred Thousand Dollars ($500,000), to be delivered by Buyer pursuant to
Paragraph 4.3 within two (2) Business Days after Seller's delivery of the
Entitlement Approval Notice.

                  2.1.47   "SELLER IMPROVEMENTS" means the improvements to be
constructed by Seller, including the Infrastructure Improvements, as set forth
on EXHIBIT C.

                  2.1.48   "SELLER'S GRANT DEED" means a fully executed and
acknowledged original grant deed in the form of EXHIBIT B, conveying the Land to
Buyer.

                  2.1.49   "SELLER'S WARRANTIES" means each of the matters set
forth in Paragraph 12.2 below.

                  2.1.50   "TENTATIVE MAP" means Vesting Tentative Map No.
98-1199, encompassing the Carroll Canyon Land, being processed with City by
Seller as one of the Entitlements, in the form provided to Buyer as part of the
Property Documents.

                  2.1.51   "TITLE INSURER" means Stewart Title Insurance
Company.

                  2.1.52   "TITLE POLICY" means a CLTA owner's policy of title
insurance, with liability in the amount of the Purchase Price, insuring that the
fee title to the Land vests in Buyer subject only to the Permitted Exceptions.
The actual Title Policy may contain additional endorsements requested by Buyer,
but Seller shall have no obligation with respect to any such additional
endorsements except to the extent Seller expressly assumes such obligation. At
Buyer's election and sole expense, Buyer may elect that the Title Policy be
written with ALTA Extended Coverage pursuant to Paragraph 8.2 below.

                  2.1.53   "UNAVOIDABLE DELAY" means delays caused by any of the
following, which to the extent they cause a delay in a party's performance shall
excuse the delay and extend the time for such party's performance: acts of the
other party; action of the elements; war, terrorism, riot, or civil
insurrection; building moratoria, trip generation restrictions or other similar
action by the City or other governmental agency or entity; labor disputes;
inability to procure or a general shortage of labor or materials in the normal
channels of trade; delay in transportation; delay in inspections; delays in or
restrictions on grading or other Pre-Closing Improvements incident to
storm-water runoff requirements; or any other cause beyond the reasonable
control of the party so obligated, whether similar or dissimilar to the
foregoing. Notwithstanding the foregoing, in no event shall delays caused by a
party's financial inability or shortage of funds constitute Unavoidable Delay.

                    ARTICLE 3. AGREEMENT OF PURCHASE AND SALE

                                      -5-
<Page>

         3.1      AGREEMENT OF PURCHASE AND SALE. In consideration of the
covenants contained in this Agreement, Buyer shall purchase the Land from
Seller, and Seller shall sell the Land to Buyer, for the Purchase Price and upon
the terms and subject to the conditions of this Agreement.

         3.2      PAYMENT OF PURCHASE PRICE. The Purchase Price shall be paid by
Buyer according to the following summary:

<Table>

<S>                                                                                <C>
Escrow Opening Deposit:                                                               $250,000

First Additional Deposit to be delivered to Escrow Holder on or
before the Contingency Date subject to Article 6 below:                               $250,000

Second Additional Deposit to be delivered to Escrow Holder within
two (2) Business Days after Seller's delivery of the Entitlement                      $500,000
Approval Notice:

Cash to be delivered to Escrow Holder upon the Closing Date, LESS interest
credited to Buyer on the Deposits and (if applicable) the Assessment District
Credit [to be adjusted based on the
actual Net Salable Area]:                                                          $26,534,276

</Table>

                 ARTICLE 4. BUYER'S DELIVERIES TO ESCROW HOLDER

         4.1      ESCROW OPENING DEPOSIT. Buyer shall, within one (1) Business
Day after the Escrow Opening Date, deliver the Escrow Opening Deposit to Escrow
Holder.

         4.2      FIRST ADDITIONAL DEPOSIT. Buyer shall, on or before the
Contingency Date and concurrently with satisfaction of the special conditions of
Paragraphs 6.1.1 and 6.1.2, deliver the First Additional Deposit to Escrow
Holder.

         4.3      SECOND ADDITIONAL DEPOSIT. Buyer shall, within two (2)
Business Days after Seller's delivery of the Entitlement Approval Notice,
deliver the Second Additional Deposit to Escrow Holder.

         4.4      DELIVERIES BEFORE CLOSING DATE. Buyer shall, no later than
4:00 p.m. of the last Business Day before the Closing Date (or with respect to
the Cash delivery, by wire transfer received by Escrow Holder in time for Escrow
Holder to authorize recording of Seller's Grant Deed in the Official Records on
the Closing Date), deliver to Escrow Holder each of the following:

                  4.4.1    CASH FOR PURCHASE PRICE. In Cash, the balance of the
Purchase Price, as the Purchase Price has been determined based on the actual
Net Salable Area certified by Seller's civil engineer in the Grading
Certifications, less any interest credited to Buyer pursuant to Paragraph 10.1
below and less any Assessment District Credit as to which the parties notify
Escrow Holder pursuant to Paragraph 7.5.2 below.

                  4.4.2    BUYER'S CHARGES. In Cash, the charges which are
payable by Buyer under Article 9 below.

         4.5      CONDITION TO DELIVERY. Buyer's obligation to deliver funds and
instruments under Paragraph 4.4 is conditional upon Buyer's receipt of written
or telephonic notification by Escrow Holder that, except for the delivery of
such funds and the recordation of documents, this Escrow is in condition to be
closed. Escrow Holder is instructed to give the notification to Buyer when this
Escrow can, except as to the receipt and disbursement of Cash and the recording
of documents, be closed.

         4.6      BREACH. The failure of Buyer to make any delivery described
above by the date, or within the time, set forth above shall be a material
breach of this Agreement by Buyer.

                                      -6-
<Page>

                 ARTICLE 5. SELLER'S DELIVERIES TO ESCROW HOLDER

         5.1      DELIVERIES BEFORE CLOSING DATE. Seller shall (i) convey to
Buyer the fee estate to the Land, together with all other right, title and
interest, tangible and intangible, in and to the real property comprising the
Land, free of all encumbrances and matters subject only to the Permitted
Exceptions, and (ii) no later than 3:00 p.m. of the day before the Closing Date
deliver to Escrow Holder:

                  5.1.1    SELLER'S GRANT DEED. Seller's Grant Deed, conveying
the Land to Buyer and meeting the requirements of Title Insurer in order to
issue the Title Policy.

                  5.1.2    FIRPTA/CAL-FIRPTA AFFIDAVIT. An affidavit stating in
favor of Buyer that Seller is not a "foreign person" as defined in the federal
Foreign Investment in Real Property Tax Act of 1980 and the 1984 Tax Reform Act
and California Revenue and Taxation Code Sections 18805 and 26131 and otherwise
meeting the requirements of such statutes such that Buyer is not responsible for
withholding any portion of the Purchase Price with respect thereto.

                  5.1.3    ASSIGNMENT OF WARRANTIES AND INTANGIBLE RIGHTS. The
Assignment of Warranties and Intangible Rights, signed by Seller as Assignor.

                  5.1.4    CERTIFICATION OF SELLER. Seller's certification to
Buyer of the truth and accuracy of Seller's Warranties, as of the Close of
Escrow.

         5.2      BREACH. The failure of Seller to make any delivery described
above by the date, or within the time, set forth above shall be a material
breach of this Agreement by Seller.

       ARTICLE 6. SPECIAL CONDITIONS; TERMINATION; CONSEQUENCES OF FAILURE

         6.1      SPECIAL CONDITIONS. The Close of Escrow is subject to the
following special conditions:

                  6.1.1    TITLE. Buyer's approval of the covenants, conditions,
reservations, restrictions, easements and other matters (excepting taxes, deeds
of trust or other liens) described in the Preliminary Report. Unless Buyer
delivers written notice of approval of the state of title to Escrow Holder on or
before the Contingency Date, this special condition shall be conclusively deemed
to have failed and Buyer shall be entitled to the return of the Deposits then
made (subject to any deductions pursuant to Paragraph 8.4.1). If Buyer does
approve this condition, all covenants, conditions, reservations, restrictions,
easements and other matters (excepting taxes, deeds of trust, mechanic's liens,
and LIS PENDENS notices) listed as exceptions to coverage in the Preliminary
Report shall be conclusively deemed to be Permitted Exceptions. Notwithstanding
anything in the foregoing to the contrary, in no event will any taxes, deeds of
trust, mechanic's liens, or LIS PENDENS notices be deemed to be Permitted
Exceptions. Nothing in this Paragraph 6.1.1 shall limit or otherwise affect
Buyer's right in its sole and absolute discretion to disapprove the suitability
of the Land pursuant to Paragraph 6.1.2.

                  6.1.2    SUITABILITY OF LAND. Buyer's approval of the Property
Documents, the Entitlements, the ADTs, the CC&Rs and the physical condition,
soils, development potential, marketability and all other aspects of the Land
which Buyer, in its sole discretion, deems material to Buyer's decision to
purchase the Land. Unless Buyer has delivered to Escrow Holder, no later than
4:30 on the Contingency Date, both written notice of approval of this condition
and the First Additional Deposit, this condition shall be conclusively deemed to
have failed. If Buyer does not timely approve this condition, Buyer shall be
entitled to the return of the Escrow Opening Deposit (subject to any deductions
pursuant to Paragraph 6.4). Buyer's approval of the Land and Property Documents
as of the Contingency Date shall not be deemed to extend to any material change
or modification therein occurring after the Contingency Date.

                  6.1.3    APPROVAL OF ENTITLEMENTS. City's approval of the
Entitlements and Seller's approval of the Entitlement Approval Conditions.
Unless Seller delivers the Entitlement Approval Notice to Buyer and Escrow
Holder on or before January 31, 2002, this special condition shall be
conclusively deemed to have failed and Buyer shall be entitled to the return of
the Escrow Opening Deposit (subject to any deductions

                                      -7-
<Page>

pursuant to Paragraph 6.4). The parties acknowledge and agree that unless the
Entitlement Approval Conditions are wholly consistent with and do not go beyond
the Acceptable Entitlement Approval Conditions listed in EXHIBIT D, Seller shall
have the right, in Seller's sole discretion and notwithstanding City's
conditional approval of the Entitlements, to determine that the Entitlement
Approval Conditions are unacceptable and therefore not to send the Entitlement
Approval Notice. In such event, this special condition will fail, and Buyer
shall be entitled to the return of the Deposits (subject to any deductions
pursuant to Paragraph 6.4) and to reimbursement of out-of-pocket expenses
pursuant to Paragraph 6.4 below.

                  6.1.4    INFRASTRUCTURE IMPROVEMENT PERMIT AND BOND. City's
issuance to Seller of a permit for construction of the Camino Santa Fe
Improvements and Seller's having posted all bonds required by City in connection
therewith. This condition shall be deemed satisfied only upon Seller's delivery
of written notice to Buyer that the Camino Santa Fe Improvements have been
bonded and permitted, accompanied by copies of the permit and bonds.

                  6.1.5    GRADING CERTIFICATIONS. Seller's delivery of the
Grading Certifications to Buyer and Escrow Holder.

                  6.1.6    FINAL MAP. Recordation of the Final Map prior to the
Closing Date, such that (i) Seller may convey the Land in compliance with the
California Subdivision Map Act and other applicable law, and (ii) any
relinquishment of building rights shown on the Interim Map have been rescinded
or otherwise made inapplicable to the Land.

                  6.1.7    NO MATERIAL ADVERSE CHANGE. No event or circumstance
shall have occurred that materially and adversely affects the physical condition
of the Land from that contemplated by the Grading Certifications, or that causes
the release or discharge of any material quantity of Hazardous Materials on or
beneath the Land in violation of applicable law, or that changes the Land's
zoning to be inconsistent with the approved Entitlements. This condition shall
be conclusively deemed satisfied unless Buyer delivers written notice to Seller
and Escrow Holder, at least one (1) Business Day prior to the then-scheduled
Closing Date, setting forth a detailed description of the events or conditions
giving rise to Buyer's claim that this special condition has failed.

                  6.1.8    UNTRUTH OR INVALIDITY OF CERTAIN REPRESENTATIONS AND
WARRANTIES. There shall have occurred no events or circumstances following the
Escrow Opening Date that would both (i) render invalid any of the
representations and warranties of Seller set forth in Paragraphs 12.2.5 through
12.2.12 below, and also (ii) materially and adversely affect Buyer's Project.
This condition shall be conclusively deemed to have been satisfied unless Buyer
delivers to Escrow Holder, on or before 3:30 p.m. on the last Business Day
before the Closing Date, written notice accompanied by a statement setting forth
in detail of the specific representation and warranty which is invalid, and the
facts or circumstances which have rendered it invalid, and the nature of the
material and adverse effect of those facts or circumstances on Buyer's Project.

         6.2      EXTENSION OF CLOSING DATE.

                  6.2.1    TO ACCOMMODATE SELLER'S EXCHANGE. Seller shall have
the right to extend the Closing Date one or more times to a date that is no
later than the Latest Closing Date, in order to accommodate Seller's Exchange,
by delivery each time to Escrow Holder and to Buyer of written notice of
extension at least ten (10) Business Days before the then-scheduled Closing
Date.

                  6.2.2    TO ACCOMMODATE DELAY IN PERMIT, FINAL MAP OR GRADING
CERTIFICATIONS. If the requirements under Paragraph 6.1.4 above have not been
met, or if the Grading Certifications have not been delivered, or the Final Map
has not been recorded, by the tenth (10th) Business Day before the
then-scheduled Closing Date, the Closing Date shall be automatically extended
until the date which is the earlier to occur of the Latest Closing Date or ten
(10) Business Days after satisfaction of all such requirements.

         6.3      WAIVER. The special conditions described in Paragraphs 6.1.1,
6.1.2, 6.1.7 and 6.1.8 are for the benefit of Buyer, and if not timely satisfied
(or deemed satisfied) may thereafter be waived unilaterally by Buyer unless and
until such time as either party elects to terminate this Escrow pursuant to the
following Paragraph. The special conditions of Paragraphs 6.1.3 through 6.1.5
are for the benefit of both parties, and if

                                      -8-
<Page>

not timely satisfied may thereafter be waived only by both parties. Any such
waiver will be effective only if the same is in writing, signed by the waiving
party, and delivered to Escrow Holder prior to delivery by either party of a
written notice of termination pursuant to the following Paragraph. The special
condition described in Paragraph 6.1.6 cannot be waived.

         6.4      TERMINATION. If any of the special conditions described in
Paragraph 6.1 has been neither satisfied nor waived in the manner and by the
time specified therein, a party who is not then in default hereunder shall have
the right to terminate this Agreement (and the Escrow) by delivering a written
notice of termination to Escrow Holder. The right to so terminate this Agreement
(and the Escrow) shall be optional, not mandatory. If the notice is delivered,
the provisions of Paragraph 8.4 shall apply. In addition, if the grounds for
termination is Seller's failure to approve the Entitlement Approval Conditions
pursuant to Paragraph 6.1.3, Seller shall reimburse Buyer, within thirty (30)
days after receipt of paid invoices and other documentation reasonably requested
by Seller, for all out-of-pocket expenses reasonably incurred by Buyer for
third-party consultants, engineers, attorneys and others involved in Buyer's
investigation of the Property or negotiation and documentation of this Agreement
and shall be responsible for all escrow termination costs and fees. In all other
instances of a permitted termination of this Agreement, escrow termination fees
and costs shall be split equally between the parties.

                  ARTICLE 7. PRE-CLOSING RIGHTS AND OBLIGATIONS

         7.1      LIMIT ON ESCROW HOLDER'S RESPONSIBILITIES. Escrow Holder shall
have no concern with, nor liability nor responsibility for, this Article.

         7.2      DELIVERY OF DOCUMENTS; COOPERATION. Buyer acknowledges having
received and reviewed the Property Documents, the CC&Rs and a Natural Hazard
Disclosure. Seller shall make available to Buyer any updates or replacements of
any of the delivered Property Documents that Seller receives during the term of
this Agreement. Also during the term of this Agreement, Seller shall allow Buyer
and its agents, consultants and advisors access, during normal business hours
and on reasonable advance notice, to any other documents relating to the Land
that are in Seller's files or reasonably accessible to Seller. Seller shall
cooperate as reasonably requested by Buyer in connection with Buyer's
investigation of the Land, but at no expense to Seller.

         7.3      PROCESSING OF INTERIM AND FINAL MAPS AND IMPROVEMENT PLANS.
Promptly following Seller's delivery of the Entitlement Approval Notice, Seller
shall apply for, and thereafter diligently process with City, at Seller's sole
expense, the Interim and Final Maps and the improvement plans for the
Infrastructure Improvements and other Seller Improvements. Because all of the
Land will be used for Buyer's Project, in order to eliminate the need for the
two cul-de-sacs shown on the Tentative Map, the process Seller intends using to
obtain recordation of the Final Map involves Seller's first processing and
recording the Interim Map, which will consolidate Lots 1 through 10 shown on the
Tentative Map into no fewer than five lots or parcels as to which all building
rights will be restricted or relinquished, but without dedication for public use
of the two cul-de-sacs shown on the Tentative Map. With respect to the
cul-de-sacs, Buyer acknowledges that City may require reservation on the Interim
and Final Maps of access easements in the approximate locations of the
cul-de-sacs, with the easements to be extinguishable on City's approval of the
site plan to be processed by Buyer as part of Buyer's Project. Several months
after recordation of the Interim Map, using the City's substantial conformance
review process, Seller expects to obtain approval and recordation of the Final
Map, in the same form (and with the same number and configuration of lots) as
the Interim Map but with the building restriction rescinded, so that the Land
will exist as five or more buildable lots or parcels. In processing the Interim
and Final Maps, Seller shall seek input from and consult with Buyer (including
without limitation as to the number and configuration of the five or more lots
or parcels to be created on the Interim and Final Maps), and shall afford Buyer
the opportunity to be present in discussions with City regarding the maps.
Seller shall use reasonable efforts to prevent imposition by City of, and Buyer
shall have the right reasonably to approve, any conditions that would impose on
Buyer any off-site improvement obligations or additional fees (beyond those
payable at building permit issuance and the anticipated Mira Mesa Facilities
Benefit Assessment fees).

         7.4      PRE-CLOSING IMPROVEMENTS BY SELLER. Seller shall use
commercially reasonable efforts to obtain a permit for construction of the
Camino Santa Fe Improvements, to post all bonds required by City in connection
therewith. Following City's approval of the improvement plans for the
Infrastructure Improvements,

                                      -9-
<Page>

Seller shall use commercially reasonable efforts to promptly obtain the
necessary other permits for and shall commence and complete construction of the
Pre-Closing Improvements as soon as practicable. Buyer shall be entitled to
observe the grading of the Land, and bring to Seller's attention any perceived
discrepancies or deviations from the grading plans and specifications. The
parties acknowledge, in this regard, the possibility that in the course of the
grading of the Land, Seller's soils consultant and/or civil engineer may propose
changes to the grading plans or specifications to address conditions in the
field. If any such proposed changes would materially and adversely affect the
Land or Buyer's Project (E.G., by the loss of a material portion of the pad area
usable for Buyer's Project), Seller shall deliver to Buyer notice of the
proposed change and reasonable supporting information, and Buyer shall have a
period of five (5) Business Days in which to approve or disapprove the change.
Buyer's failure to respond within the specified period shall be conclusively
deemed Buyer's approval of the proposed change. Any change that is approved or
deemed approved by Buyer shall thereafter be deemed part of the approved soils
report, grading specifications and/or grading plans, for purposes of the Grading
Certifications. If the Grading Certifications as presented by Seller do reflect
any material deviation from the approved soils report, grading specifications
and/or grading plans (as the same may have been modified pursuant to the
preceding sentence), Buyer shall have a period of five (5) Business Days in
which to approve or disapprove the deviation; in the absence of any such
material deviation, Buyer shall have no right to approve or disapprove the
Grading Certifications.

         7.5      ASSESSMENT DISTRICT FOR INFRASTRUCTURE IMPROVEMENTS.

                  7.5.1    GENERAL. Buyer acknowledges that Seller may join with
the owner of the real property to the east of Camino Santa Fe in forming an
Assessment District to finance approximately $11,000,000 of the costs of
constructing some or all of the Seller Improvements and other infrastructure
serving the Carroll Canyon Land, and that the Land will likely be included in
the Assessment District. The parties also acknowledge that the Purchase Price
has been determined to reflect Seller's being responsible for the Infrastructure
Improvements and other improvements that may be financed by the Assessment
District. Accordingly, subject to the provisions of this Paragraph 7.5, the
parties wish to provide for Seller's right to include the Land in an Assessment
District, whether the same is formed before or after the Close of Escrow, and
for Seller, not Buyer, to bear the cost of the Land's allocable share of any
assessments imposed by the Assessment District. Subject to the provisions of
this Paragraph 7.5, Buyer agrees to take title to the Land subject to the lien
of the Assessment District, and to cooperate with Seller as is reasonably
necessary in Seller's efforts to form the Assessment District. Seller shall keep
Buyer informed of Seller's decision whether to seek the Land's inclusion in an
Assessment District, and shall provide Buyer with copies of the material
correspondence and other documents relating to formation of any Assessment
District.

                  7.5.2    PRE-CLOSING FORMATION OF ASSESSMENT DISTRICT. If,
prior to the Close of Escrow, the Assessment District has been formed and the
amount of the Land's allocable assessment thereunder is known, then Buyer shall
be entitled to the Assessment District Credit to be applied against the Purchase
Price. The amount of the Assessment District Credit shall be determined at
Buyer's election, as either (i) the amount necessary to pay in full the Land's
share of such assessment prior to issuance of bonds, or (ii) the present value
of the aggregate of the Land's future assessment payments taken to term, using
the bonds' effective interest rate as the discount rate for present value
determination. Upon determination of the amount of the Assessment District
Credit, if any, the parties shall notify Escrow Holder in writing and such
amount shall not be required to be deposited by Buyer into Escrow as part of the
Purchase Price. If Land has been irrevocably subjected to the Assessment
District but the exact amount of the Land's assessment has not been determined,
then at Seller's election, either of the following shall apply:

                             (a) Seller shall provide a letter of credit issued
         by a bank reasonably approved by Buyer (or other security reasonably
         satisfactory to Buyer) in the amount reasonably estimated by Seller and
         approved by Buyer as the likely amount of the Assessment District
         Credit as security for Seller's reimbursement obligation, Buyer shall
         pay the full Purchase Price without the Assessment District Credit, and
         upon the post-Closing determination of the exact amount of the Land's
         share of the assessment, Seller shall reimburse Buyer, in Cash, for the
         amount that would have been the Assessment District Credit.

                             (b) The parties shall instruct Escrow Holder to
         retain as security for Seller's reimbursement obligation, from funds
         that would otherwise have been payable to Seller, the amount reasonably
         estimated by Seller and approved by Buyer as the likely amount of the
         Assessment

                                      -10-
<Page>

         District Credit, and upon the post-Closing determination of the exact
         amount of the Land's share of the assessment, Buyer shall be entitled
         to that portion of the held-back funds in the amount that would have
         been the Assessment District Credit, and Seller shall be entitled to
         the balance, if any. If the amount of the held-back funds is less than
         the amount that would have been the Assessment District Credit, Seller
         shall pay the difference to Buyer within thirty (30) days after the
         determination of the amount has been made.

                  7.5.3    POST-CLOSING FORMATION OF ASSESSMENT DISTRICT. If the
Assessment District has not been formed as of the Close of Escrow, for a
period of three (3) years after the Close of Escrow (or until such earlier
time as Seller notifies Buyer in writing that Seller will not be seeking the
Land's inclusion within an Assessment District), Buyer shall cooperate as
reasonably requested by Seller in forming the Assessment District following
the Close of Escrow, including, without limitation, voting in favor of the
formation thereof in the manner and at the times as are determined by Seller
in its sole discretion. Upon the determination of the exact amount of the
Land's share of the assessment, Seller shall reimburse Buyer, in Cash, for
the amount that would have been the Assessment District Credit; provided,
however, that Buyer shall have no obligation to subject the Land to the
Assessment District unless and until Seller provides Buyer a letter of credit
issued by a bank reasonably approved by Buyer (or other security reasonably
satisfactory to Buyer) in the amount reasonably estimated by Seller and
approved by Buyer as the likely amount of the Assessment District Credit, as
security for Seller's reimbursement obligation. Upon the expiration of the
three-year period after the Close of Escrow, or following Seller's written
notification to Buyer that Seller will not be seeking the Land's inclusion
within an Assessment District, Buyer shall have no further obligation to
cooperate with Seller's efforts to form the Assessment District. Until such
time, and subject to Buyer's receipt of the letter of credit or other
security:

                             (a) Buyer shall not file any written or oral
         protest or opposition of any kind to the formation of the Assessment
         District or the levying of liens, assessments, taxes, special taxes,
         exactions, fees, and/or charges (collectively "Impositions") through
         the Assessment District.

                             (b) Buyer shall consent to, or, if an election is
         called, cast its vote in favor of the Assessment District and the
         levying of Impositions by the Assessment District.

                             (c) Buyer shall not take any action that would in
         any way interfere with the formation of the Assessment District or
         decisions made or actions taken by Seller with respect to the
         Assessment District or the bond financing relating thereto, including,
         without limitation, the timing of commencement of Impositions, the
         amount of Impositions, the spreading of Impositions and the use of the
         Impositions collected by the Assessment District.

                             (d) To the extent any owner of record of the Land
         has the right to protest the formation of the Assessment District,
         those rights shall be held solely by Seller. Upon the request of
         Seller, Buyer shall grant Seller its proxy to vote its interest as a
         landowner in any election involving the Assessment District.

         7.6      COOPERATION WITH SELLER'S EXCHANGE. Buyer agrees to cooperate
with Seller in effecting an Exchange, including, without limitation, consenting
to the assignment of this Agreement to a qualified intermediary selected by
Seller, provided that any such exchange transaction, and the related
documentation, shall not: (i) require Buyer to execute any contract (other than
as set forth herein), make any commitment, or incur any cost, liability or
obligations, contingent or otherwise, to third parties which would expand
Buyer's obligations beyond those arising under this Agreement absent the
Exchange, (ii) delay the Closing or the transaction contemplated by this
Agreement except as provided in Paragraph 6.2 above, or (iii) require Buyer to
acquire title to any other real property. In connection with and without
limiting the foregoing, Buyer shall sign and deliver to the Seller, no later
than five (5) days prior to the Closing Date, documents substantially similar to
those which are attached as EXHIBIT D. Notwithstanding any assignment by Seller
in connection with an Exchange, all representations, warranties and covenants of
Seller expressly set forth herein shall continue to be for the benefit of Buyer.

                             ARTICLE 8. THE CLOSING

                                      -11-
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         8.1      CONDITIONS TO CLOSING. Escrow Holder shall close this Escrow
on the Closing Date (as the same may have been extended pursuant to Paragraph
6.2) by (i) filing in the Official Records the Development Declaration, Seller's
Grant Deed and such other documents as may be necessary to procure the Title
Policy, and (ii) delivering funds and documents to the parties (as set forth in
the Article of this Agreement entitled "Distribution of Funds and Documents")
WHEN AND ONLY WHEN each of the following conditions has been satisfied:

                  8.1.1    DELIVERIES. All funds and documents described in
Articles 4 and 5 have been delivered to Escrow Holder.

                  8.1.2    THE TITLE POLICY. Title Insurer is irrevocably
committed to issue the Title Policy.

                  8.1.3    SPECIAL CONDITIONS. The special conditions of
Paragraph 6.1 have been either satisfied or waived.

         8.2      ALTA EXTENDED COVERAGE TITLE POLICY. Buyer may, at its option,
direct Escrow Holder to procure an ALTA Extended Coverage Title Policy from
Title Insurer, with liability in the amount of the Purchase Price. If Buyer does
so elect an ALTA Extended Coverage Title Policy, then all references in this
Agreement to the "Title Policy" shall refer to the ALTA Extended Coverage Title
Policy; provided, however, Buyer shall be solely responsible to timely supply to
Title Insurer, at Buyer's sole cost, any ALTA survey required by Title Insurer
as a condition to the issuance of the ALTA Extended Coverage Title Policy, and
provided further, that the term "Permitted Exceptions shall thereafter include
both (i) the exclusions listed in the standard "Schedule of Exclusions from
Coverage" of the ALTA tended Coverage Title Policy, and (ii) any off-record
matters not reflected in the Pro Forma Title Policy that Title Insurer
determines, by an ALTA survey or otherwise, will affect the Land.

         8.3      EARLY CLOSING. If all of the conditions set forth in Paragraph
8.1 become satisfied at a date earlier than the Closing Date, Escrow Holder
shall, at Buyer's request and subject to Seller's approval, close this Escrow at
the earlier date.

         8.4      DELAYED CLOSING; TERMINATION. If Escrow Holder cannot close
this Escrow on or before the Closing Date, it shall, nevertheless, close the
Escrow when all conditions have been satisfied or waived, unless after the
Closing Date and prior to the Close of Escrow, Escrow Holder receives a written
notice to terminate this Agreement and the Escrow from a party who, at the time
the notice is delivered, is not in default under this Agreement; provided,
however, Seller's failure to effect the Exchange by the Closing Date shall not
be grounds for termination of this Agreement or the Escrow by Seller. The right
to terminate this Agreement and this Escrow will be optional, not mandatory.

                  8.4.1    TERMINATION OF ESCROW. Escrow Holder shall have no
liability or responsibility for determining that a party giving a written notice
to terminate is not in default under this Agreement. Within five (5) Business
Days after receipt of a notice from one party, Escrow Holder shall deliver one
copy of such notice to the other party. Unless written objection to termination
of this Escrow is received by Escrow Holder within five (5) Business Days after
Escrow Holder delivers such notice to the other party, Escrow Holder shall
promptly terminate this Escrow and, unless Paragraph 6.4 specifies otherwise,
return all funds and documents held by it to the party who deposited the same.
If written objection to the termination of this Escrow is delivered to Escrow
Holder within such five (5) Business Day period, Escrow Holder is authorized to
hold all funds and documents delivered to it in connection with this Escrow and
Escrow Holder may, in Escrow Holder's sole discretion, take no further action
until otherwise directed, either by the parties' mutual written instructions or
by a final order or judgment of a court of competent jurisdiction. In the event
of any litigation involving the retention of the Deposits, all costs associated
therewith (including any costs incurred by Escrow Holder in an interpleader
action) shall be borne by the party who is not the "prevailing party" as
determined pursuant to Paragraph 19.1 below.

                  8.4.2    LEGAL REMEDIES OF PARTIES NOT AFFECTED. Subject to
the possible applicability of Paragraphs 14.3 or 14.4, neither (i) the exercise
of such right of termination, (ii) delay in the exercise of such right, nor
(iii) the return of funds and documents, shall affect the right of the party
giving the notice of termination to recover damages or pursue other available
legal remedies for the other party's breach of this

                                      -12-
<Page>

Agreement. Nor shall (a) the receipt of the notice, (b) any failure to object to
termination of this Escrow, or (c) the return of funds and documents affect the
right of the other party to recover damages or pursue other available legal
remedies for the breach of the party who gives the notice of termination.

                      ARTICLE 9. PRORATIONS, FEES AND COSTS

         9.1      PRORATION OF PROPERTY TAXES. Escrow Holder shall prorate
(I.E., apportion) between the parties, in Cash, to the Close of Escrow, General
and Special Real Estate Taxes, based on the latest information available to
Escrow Holder from the appropriate city or county office; provided, however,
that the prorations shall be made by Escrow Holder without regard to any
supplemental assessments levied pursuant to California Revenue & Taxation Code,
Section 75 and following, which shall be prorated pursuant to Paragraph 9.2
below. All prorations shall be done based strictly upon the date on which the
Close of Escrow occurs, without regard to the payment due date. All General and
Special Real Estate Taxes levied on the Land with respect to periods up to and
including the Closing Date shall be the responsibility of Seller and all such
amounts levied with respect to periods subsequent to the Closing shall be the
responsibility of Buyer.

         9.2      SUPPLEMENTAL TAXES. A supplemental tax bill representing the
tax due on any supplemental assessment relating to a date prior to the Close of
Escrow may be issued either before the Close of Escrow or subsequent thereto. If
a supplemental tax bill is received by Seller and delivered to Escrow Holder
prior to the Close of Escrow, Escrow Holder shall prorate said bill as specified
in Paragraph 9.1 above. If a supplemental tax bill is received by either party
after the Close of Escrow, the parties agree to prorate the amount of the
supplemental assessment relating to the times before and after the Close of
Escrow as specified in Paragraph 9.1 above. Within ten (10) Business Days after
written demand by Buyer for Seller's pro rata share of such supplemental tax
bill, Seller shall pay Buyer therefor. In the event Seller should fail to pay
said sums to Buyer when due, the same shall accrue interest at the maximum legal
rate from the date due until fully paid. As a post-closing covenant, (i) Buyer
agrees to hold Seller harmless from and indemnify it against any and all such
supplemental real property taxes (but not any penalties or interest resulting
from Seller's delayed forwarding or payment of the supplemental tax bill) which
may be imposed on the Land which relate to any period after the Close of Escrow,
and (ii) Seller agrees to hold Buyer harmless from and indemnify it against any
and all such supplemental real property taxes (but not any penalties or interest
resulting from Buyer's delayed forwarding or payment of the supplemental tax
bill) which may be imposed on the Land which relate to any period prior to the
Close of Escrow.

         9.3      POST-CLOSING ADJUSTMENTS. Buyer and Seller agree to re-prorate
any of the above-referenced prorations if, after the Close of Escrow, more
accurate or definitive information becomes available with respect thereto. The
party receiving such information shall deliver written notice thereof to the
other party within five (5) days of such receipt and, within five (5) days
thereafter, the parties shall re-prorate the affected matter and a party which
is thereby shown to have received an excess credit shall to the extent of such
excess immediately reimburse the other party.

         9.4      SELLER'S CHARGES. Seller shall pay (i) all documentary
transfer tax with respect to Seller's Grant Deed, (ii) the Title Policy premium,
including the cost of any endorsements expressly agreed to be provided by Seller
(but not including for any additional premium incident to Buyer's ordering an
ALTA Extended Coverage Policy), (iii) one-half of Escrow Holder's fee or
termination charge, (iv) fees for beneficiaries' statements, and (v) usual
seller's document-drafting and recording charges, including, without limitation,
with respect to the Final Map.

         9.5      BUYER'S CHARGES. Buyer shall pay (i) one-half of Escrow
Holder's fee or termination charge, (ii) the cost of any Title Policy
endorsements not expressly agreed to be provided by Seller, (iii) survey costs
and/or additional premiums incident to the ALTA Extended Coverage Policy (if
ordered by Buyer pursuant to Paragraph 8.2 above), and (iv) usual buyer's
document-drafting and recording charges.

                 ARTICLE 10. DISTRIBUTION OF FUNDS AND DOCUMENTS

         10.1     INTEREST. Any sums delivered by Buyer to Escrow Holder
pursuant to this Agreement and not immediately released to Seller shall be
deposited by Escrow Holder into a liquid money market account with a bank
approved by Buyer. Interest earned on Buyer's deposits shall belong to Buyer and
shall be credited upon

                                      -13-
<Page>

receipt to Buyer's funds held by Escrow Holder. Escrow Holder's processing fee
for establishing the account shall be paid by Buyer.

         10.2     DISBURSEMENTS. All disbursements by Escrow Holder shall be
made by checks of Escrow Holder or, at the request of the party to whom
disbursement is made, by wire transfer.

         10.3     PAYMENT OF ENCUMBRANCES. Escrow Holder shall, at the Close of
Escrow, pay, from funds to which Seller will be entitled, to the appropriate
obligees, all liens, claims and encumbrances other than those set forth in the
Pro Forma Title Policy or those of any Assessment District formed in accordance
with Paragraph 7.5 above.

         10.4     RETURN AFTER RECORDING. Escrow Holder shall cause the County
Recorder of San Diego County to mail Seller's Grant Deed after recordation to
the grantee.

         10.5     DELIVERY OF INSTRUMENTS. Escrow Holder shall, at the Close of
Escrow, deliver by United States mail (or shall hold for personal pickup, if
requested) each non-recorded instrument received by Escrow Holder to the payee
or person (i) acquiring rights under the instrument, or (ii) for whose benefit
the instrument was acquired.

         10.6     DELIVERY OF CASH. Escrow Holder shall, at the Close of Escrow,
deliver by Federal Express or United States mail (or shall hold for personal
pickup, if requested) (i) to Seller, or order, the balance of the Cash portion
of the Purchase Price to which Seller will be entitled after payment of Seller's
charges, and (ii) to Buyer, or order, any excess funds delivered to Escrow
Holder by Buyer.

         10.7     REPORTING TO INTERNAL REVENUE SERVICE. Any returns, statements
or reports required to be filed under Section 6045(e) of the INTERNAL REVENUE
CODE OF 1986 (or any similar reports required by state or local law) or relating
to the Land shall be filed by Escrow Holder. In no event shall this Agreement be
construed so as to require that such returns, reports or statements be filed by
Buyer, Buyer's counsel, Seller or Seller's counsel. Within five (5) days of the
date Escrow Holder shall receive a written request from Seller and/or Buyer to
do so, Escrow Holder shall provide evidence to Seller and/or Buyer of its
compliance with the provisions of this Paragraph.

         10.8     SETTLEMENT STATEMENT. On the Closing Date, Seller and Buyer
shall have approved an estimated settlement statement setting forth all
prorations, disbursements and allocations of funds deposited into Escrow as a
condition to Closing.

                     ARTICLE 11. POSSESSION; ENTRY BY BUYER

         11.1     LIMIT ON ESCROW HOLDER'S RESPONSIBILITIES. Escrow Holder shall
have no concern with, nor liability nor responsibility for, this Article.

         11.2     ENTRY BY BUYER. Buyer may, during the term of this Escrow,
reasonably go upon the Land for purposes of (i) inspecting the Land, (ii)
surveying, testing, improvement designing, performing environmental studies and
the like, and (iii) determining the suitability of the Land for Buyer's
contemplated use thereof. Buyer shall hold Seller and the Land harmless from any
claim, cost, lien, action or judgment (including, without limitation, Seller's
attorneys' fees and defense costs) (a) incurred for surveyors, engineers,
architects, environmental and utility consultants, and others implementing the
purposes, and (b) for personal injury and property damage caused by Buyer or any
of its employees, agents or independent contractors. Before doing any work
contemplated by this Paragraph, Buyer shall secure and maintain, at Buyer's sole
cost, a commercial general liability and property damage insurance policy
covering Buyer's activities on the Land, with combined limits of $1,000,000 for
personal injury or death, $1,000,000 for property damage, and $1,000,000 policy
limit for aggregate operations on an occurrence basis, which shall name Seller
as an additional insured and contain a provision that such policy may not be
terminated until thirty (30) days' written notice of the proposed termination
has been delivered to Seller. Buyer shall not be liable or responsible for
temporary damage to the Land which is reasonably necessary to the investigation
of its physical characteristics, including soils tests and surveying, or any
claim that arises due to a pre-existing condition on the Land or due to the
negligent or intentional acts of Landlord or its agents or employees. If this
Agreement is terminated for any reason, Buyer

                                      -14-
<Page>

shall, as soon as practicable after such termination, at Buyer's sole cost,
repair any physical damage resulting from its activities thereon and restore the
Land to substantially the same condition it was in prior to Buyer's entry
thereon.

         11.3     POSSESSION. Possession of the Land shall pass to Buyer at the
Close of Escrow.

     ARTICLE 12. ACKNOWLEDGMENTS, WARRANTIES, REPRESENTATIONS AND COVENANTS

         12.1     LIMIT ON ESCROW HOLDER'S RESPONSIBILITIES. Escrow Holder shall
have no concern with, nor liability nor responsibility for, this Article.

         12.2     SELLER'S REPRESENTATIONS AND WARRANTIES. Seller represents
that each of the Seller's Warranties set forth in this Paragraph is true and
correct as of the date the Agreement was signed and will be true, subject to the
possible application of Paragraph 12.3, as of the Close of Escrow.

                  12.2.1   DULY ORGANIZED. Seller is duly organized, validly
existing and in good standing under the laws of the State of California, has
stock outstanding which has been duly and validly issued, and is qualified to do
business and in good standing in the State of California, with full power and
authority to consummate the transaction contemplated hereby.

                  12.2.2   DUE AUTHORIZATION. This Agreement has been duly
authorized by all requisite action, and Seller has full power and authority to
execute this Agreement, to undertake and consummate the transactions
contemplated hereby, and to pay, perform and observe all of the conditions,
covenants, agreements and obligations contained herein.

                  12.2.3   NO DEFAULT OR INSOLVENCY. The consummation of the
transaction contemplated by this Agreement, and the payment and performance of
all of the obligations of Seller hereunder, will not result in any breach of, or
constitute a default under, any contract, loan or credit agreement, corporate
charter, bylaws, trust indenture or, to Seller's current actual knowledge, any
other instrument, to which Seller is a party or by which Seller may be bound or
affected. Seller is not insolvent or the subject of any bankruptcy or creditor's
rights action or proceeding.

                  12.2.4   AGREEMENT ENFORCEABLE. No consent, approval or other
authorization of, or registration, declaration or filing with, any court,
governmental agency or commission, or lender is required for the due execution
and delivery of this Agreement or for the validity or enforceability thereof
against Seller.

                  12.2.5   OWNERSHIP OF THE LAND. Seller holds fee title to the
Land free of claims of any other party, including tenancies and other rights of
possession or occupancy, except as is shown on the Preliminary Report and has
granted no options to purchase, lease, hold or occupy the Land other than
pursuant to this Agreement.

                  12.2.6   NO MECHANIC'S LIENS. To Seller's current actual
knowledge, there are now, and will at the Closing be, no claims in favor of any
person or entity which are or could become a lien on the Land arising on account
of the furnishing of labor and/or materials to the Land.

                  12.2.7   NO PENDING LITIGATION, CONDEMNATION OR REGULATORY
ACTIONS. Except as disclosed on SCHEDULE 12.2 attached hereto, there are no
actions, proceedings, investigations or condemnation or eminent domain
proceedings pending or, to Seller's current actual knowledge, threatened against
Seller or the Land, before or by any court, arbitrator, administrative agency or
other governmental authority which would affect the ability of Seller to convey
the Land to Buyer. To Seller's current actual knowledge, except as disclosed on
SCHEDULE 12.2, there are no actions pending or recommended by the appropriate
state or federal agency having jurisdiction thereof, which would have a material
adverse effect on the development of the Land for Buyer's Project.

                  12.2.8   NO KNOWN VIOLATIONS. To Seller's current actual
knowledge, except as disclosed on SCHEDULE 12.2, Seller has received no notices
from governmental authorities or private parties pertaining to violations of law
or governmental regulations with respect to the Land, with which Seller has not
fully complied

                                      -15-
<Page>

or corrected, and Seller has no current actual knowledge of any such violations
which have not been the subject of any such governmental notices or notices from
the applicable private parties.

                  12.2.9   NO KNOWN CLAIMS. Except as disclosed on SCHEDULE
12.2, Seller has no current actual knowledge of any pending or threatened claims
by third parties with respect to the Land.

                  12.2.10  HAZARDOUS MATERIALS. Except as otherwise disclosed in
the Property Documents or on SCHEDULE 12.2: (i) no Hazardous Materials are
stored on the surface of the Land in violation of applicable law; and (ii) there
have been no past or present claims, complaints, litigation or governmental or
administrative proceedings or other restrictions of any nature brought or
threatened to be brought against the Land, nor any settlement reached with any
party or parties alleging the presence, release or threatened release of any
Hazardous Materials from or under the Land.

                  12.2.11  NO KNOWN DEFECTS. To Seller's current actual
knowledge, except as disclosed on SCHEDULE 12.2 or in the Property Documents, no
latent or patent defects in the Land have been caused by the act or omission of,
or have been consented to or suffered by, Seller during the term of Seller's
ownership of the Land.

                  12.2.12  INFORMATION PROVIDED TO BUYER. To Seller's current
actual knowledge, all documents delivered to or inspected by Buyer pursuant to
the terms of this Agreement are either original counterparts or complete and
true copies of such documents, and while Seller does not warrant the accuracy of
any such information, Seller is aware of no material inaccuracy or omission
therein or material misrepresentation of the matters purported to be contained
therein. Nothing herein limits or restricts Buyer's obligation to independently
verify the truth of any property information or other documents or materials
provided by Seller, or limits the scope or effect of any "as is" provisions of
this Agreement.

                  12.2.13  SELLER NOT A FOREIGN PERSON. Seller warrants that no
individual or entity which, under the terms of this Agreement, will transfer
United States Real Property Interests, as defined in Section 897(c) of the
INTERNAL REVENUE CODE, is a "foreign person" within the meaning of Section
1445(f) of the Internal Revenue Code. Seller also warrants that Buyer as
transferee will not be required to withhold tax pursuant to Section 26131 of the
California REVENUE AND TAXATION CODE.

         12.3     OTHER PROVISIONS RELATING TO SELLER'S WARRANTIES. Except as
expressly stated herein, Seller makes no representation or warranty as to the
truth, accuracy or completeness of any materials, data or information delivered
by Seller to Buyer in connection with the transaction contemplated hereby.
Seller's Warranties and any other representations made in this Agreement or any
other document executed in connection with the transaction shall survive the
Closing for a period of twelve (12) months. Any reference to the "knowledge" or
"current actual knowledge" of Seller shall refer only to the then current actual
knowledge of Seller's officers Henry F. Hunte, Michael P. Neal and Allen M.
Jones (whom Seller represents are the current employees of Seller most
knowledgeable about the Land), without inquiry or investigation or duty of
investigation and without imputation to any such individual of the knowledge of
others, whether or not any such others would be deemed agents of such
individuals. Buyer acknowledges and agrees that the use of the named individuals
is solely for the purpose of establishing a standard for measurement of Seller's
knowledge, and nothing herein shall impose any personal liability on any such
individual for any representation, warranty or covenant of Seller hereunder. To
the extent that Buyer knows, or to the extent that the Property Documents or any
other studies or reports commissioned or obtained by Buyer reveal, that any of
Seller's Warranties are inaccurate, untrue or incorrect, such representations
and warranties shall be deemed modified to reflect Buyer's knowledge or the
content of such documents, as the case may be; provided, however, that for the
limited purpose of Paragraph 6.1.8 only, no such modification of the
representations set forth in Paragraphs 12.2.5 through 12.2.11 shall be deemed
to occur by reason of events occurring after the Escrow Opening Date. Subject to
the foregoing, Seller shall certify as of the Close of Escrow that all Seller's
Warranties remain true and correct in all material respects.

         12.4     BUYER'S REPRESENTATIONS RE DUE DILIGENCE AND RELIANCE. Buyer
acknowledges being advised by Seller that in the past the Carroll Canyon Land
and the adjacent land to the east were used by Seller and its licensees for a
rock plant and various other vacant land uses, and that portions of the Land
have been produced by backfilling following mining operations. Buyer
acknowledges and represents that prior to the

                                      -16-
<Page>

Contingency Date, Buyer will have conducted (or will have waived its right to
conduct) all such inspections, investigations, tests, analyses, appraisals and
evaluations of the Land (including those for Hazardous Materials or such past
land uses) as Buyer considers necessary or appropriate (all of such inspections,
investigations, tests, analyses, appraisals and evaluations being herein
collectively called the "Investigations"); and that Seller has made the Property
Documents available to Buyer. Buyer has reviewed, examined, evaluated and
verified the Property Documents and the results of the Investigations to the
extent it deems necessary or appropriate with the assistance of such experts as
Buyer deemed appropriate. Buyer represents, acknowledges and agrees that (i)
Buyer is familiar with the physical condition of the Land, (ii) Buyer has
completed its due diligence with respect to the Land and the Property Documents
to its satisfaction, and (iii) except for Seller's Warranties, Buyer is
acquiring the Land based exclusively upon its own investigations and inspections
of the Land and the Property Documents. Without limiting the generality of the
foregoing, Buyer agrees that BUYER HAS NOT RELIED AND WILL NOT RELY ON, AND
SELLER SHALL NOT BE LIABLE FOR OR BOUND BY, ANY EXPRESSED OR IMPLIED WARRANTIES,
GUARANTIES, STATEMENTS, REPRESENTATIONS OR INFORMATION PERTAINING TO THE LAND OR
RELATING THERETO (INCLUDING SPECIFICALLY, WITHOUT LIMITATION, THE PROPERTY
DOCUMENTS) MADE OR FURNISHED BY SELLER, OR ANY REAL PROPERTY BROKER OR AGENT
REPRESENTING OR PURPORTING TO REPRESENT SELLER, TO WHOMEVER MADE OR GIVEN,
DIRECTLY OR INDIRECTLY, ORALLY OR IN WRITING, UNLESS SPECIFICALLY SET FORTH AS A
SELLER'S WARRANTY IN THIS AGREEMENT. BUYER REPRESENTS TO SELLER THAT BUYER HAS
CONDUCTED, OR WILL CONDUCT PRIOR TO CLOSING, SUCH INVESTIGATIONS OF THE LAND,
INCLUDING BUT NOT LIMITED TO, THE PHYSICAL AND ENVIRONMENTAL CONDITIONS THEREOF,
AS BUYER DEEMS NECESSARY TO SATISFY ITSELF AS TO THE CONDITION OF THE LAND AND
THE EXISTENCE OR NONEXISTENCE OR CURATIVE ACTION TO BE TAKEN WITH RESPECT TO ANY
HAZARDOUS MATERIALS ON OR DISCHARGED FROM THE LAND, AND WILL RELY SOLELY UPON
SAME AND NOT UPON ANY INFORMATION PROVIDED BY OR ON BEHALF OF SELLER OR ITS
AGENTS OR EMPLOYEES WITH RESPECT THERETO, OTHER THAN SUCH SELLER'S WARRANTIES AS
ARE EXPRESSLY SET FORTH IN THIS AGREEMENT.

                  Buyer's Initials:
                                    ---------

         12.5     BASIS OF PURCHASE. Buyer acknowledges that it is purchasing
the Land in reliance solely on (i) Buyer's own inspection of the Land, (ii)
Buyer's independent verification of the truth of any documents delivered by
Seller to Buyer, (iii) Buyer's independent determination of the viability of the
Buyer's proposed development project, (iv) the opinions and advice concerning
the Land provided by consultants engaged by Buyer, and (v) the representations,
warranties and covenants of Seller expressly set forth in this Agreement.
Subject to the completion of the Seller Improvements and the representations,
warranties and covenants of Seller expressly set forth in this Agreement, Buyer
shall accept the Land, and the matters relating to the Land listed below, in
their "as is, where is, with all faults" condition or status as of the Closing
Date. The matters are: soils and geological condition, topography, area and
configuration of the Land; availability of utilities, schools, public access and
fire and police protection; any easement, license or encroachment which is not a
matter of public record, whether or not visible upon inspection of the Land; any
existing or future planning, zoning and subdivision statutes, ordinances,
regulations and permits; the character and amount of park fees, public
facilities fees, school fees, inspection fees, traffic impact fees, bridge and
thoroughfare fees, drainage fees, growth management fees and any other fee or
charge which must be paid to develop the Land; and any all other matters
relating to the Land including, but not limited to, value, feasibility, cost,
marketing and investment return. Subject to the representations, warranties and
covenants of Seller expressly set forth in this Agreement, Buyer agrees to
assume, effective upon the Close of Escrow, any and all risk that any adverse
matters (including, without limitation, physical, geotechnical and environmental
conditions and the presence of any Hazardous Materials) relating to the Land may
not have been revealed by Buyer's inspections and investigations of the Land.
Buyer, for itself and its affiliates, successors and assigns (for purposes of
this Paragraph, "Releasing Parties"), hereby fully and forever releases and
discharges Seller and its affiliates and each of their agents, directors,
shareholders, employees, officers, consultants, representatives, attorneys,
successors and assigns of and from any and all past, present and future claims,
damages, losses, warranties (express or implied), debts, liabilities,
obligations, costs, expenses, demands and causes of action of any kind or
nature, whether known or unknown, foreseen or unforeseen, suspected or
unsuspected, fixed or contingent, matured or unmatured (collectively, "Claims")
that the Releasing Parties or any of them have or may have or may claim to have
in any way arising out of, related to or connected with (i) any latent or patent
defect in the Land not

                                      -17-
<Page>

caused by the act or omission of, or consented to by, Seller, or (ii) the
presence, removal or other remediation of Hazardous Materials within, under or
upon, or in the vicinity of, the Land under circumstances not constituting a
breach of any representation or warranty of Seller hereunder; provided, however,
that the foregoing release and discharge do not apply to any Claims arising from
a material default by Seller in the performance of its obligations under the
terms of this Agreement or a breach of Seller's representation in Paragraph
12.2.11. With respect to the foregoing release, Buyer hereby acknowledges that
it has read and is familiar with the provisions of, and expressly waives all
rights arising under, California CIVIL CODE Section 1542, which is set forth
below:

                  "A general release does not extend to claims which the
                  creditor does not know or suspect to exist in his favor at the
                  time of executing the release, which if known by him must have
                  materially affected his settlement with the debtor."

                  Buyer's Initials:
                                    -----------

         12.6     DEVELOPMENT FEES. Buyer acknowledges and agrees that in
connection with its development of the Land, Buyer will be subject to and will
have to comply with numerous federal, state and local statutes, ordinances,
laws, rules, regulations and restrictions and will have to pay various fees and
expenses. Buyer acknowledges and agrees that except as expressly provided in
this Agreement to the contrary, Seller shall have no liability, obligation or
responsibility of any kind with respect to any such compliance or the payment of
such fees. Nothing herein shall relieve Seller of any assessment or other
obligations of Seller as Declarant under the CC&Rs or as an owner of other
property within the Business Park.

         12.7     OTHER BUYER REPRESENTATIONS AND WARRANTIES. Buyer represents
that each of the matters set forth in this Paragraph is true and correct as of
the date the Agreement was signed.

                  12.7.1   DULY ORGANIZED. Buyer is duly organized, validly
existing and in good standing under the laws of the State of Delaware, and is
qualified to do business and in good standing in the State of California, with
full power and authority to consummate the transaction contemplated hereby.

                  12.7.2   DUE AUTHORIZATION. This Agreement has been duly
authorized by all requisite action, and Buyer has full power and authority to
execute this Agreement, to undertake and consummate the transactions
contemplated hereby, and to pay, perform and observe all of the conditions,
covenants, agreements and obligations contained herein.

                  12.7.3   NO DEFAULT. The consummation of the transaction
contemplated by this Agreement, and the payment and performance of all of the
obligations of Buyer hereunder, will not result in any breach of, or constitute
a default under, any contract, loan or credit agreement, corporate charter,
bylaws, trust indenture or, to Buyer's current actual knowledge, any other
instrument, to which Buyer is a party or by which Buyer may be bound or
affected.

                  12.7.4   AGREEMENT ENFORCEABLE. No consent, approval or other
authorization of, or registration, declaration or filing with, any court,
governmental agency or commission, or lender is required for the due execution
and delivery of this Agreement or for the validity or enforceability thereof
against Buyer.

         12.8     BROKERAGE COMMISSIONS. Seller has agreed to pay a brokerage
commission, if and only if the Escrow actually closes, to be divided equally
between Seller's broker CB Richard Ellis and Buyer's broker Burnham Real Estate
Services. Except for the foregoing commission, entitlement to and payment of
which shall be governed solely by a separate agreement between Seller and CB
Richard Ellis, each party warrants to the other that the warranting party has
incurred no obligation by reason of this Agreement or the transaction
contemplated by this Agreement, for any other real estate brokerage commission
or finder's fee for which the other party would be liable. Each party will hold
the other party free and harmless from and against any damage or expense the
other party may incur by reason of the untruth as to the warranting party of the
foregoing warranty, including expenses for attorneys' fees and court costs.

                      ARTICLE 13. POST-CLOSING OBLIGATIONS

                                      -18-
<Page>

         13.1     LIMIT ON ESCROW HOLDER'S RESPONSIBILITIES. Escrow Holder shall
have no concern with, nor liability nor responsibility for, this Article.

         13.2     POST-CLOSING COMPLETION OF SELLER IMPROVEMENTS. The following
provisions shall apply if the Seller Improvements have not been completed prior
to the Close of Escrow:

                  13.2.1   COMPLETION OF INFRASTRUCTURE IMPROVEMENTS. Subject to
the occurrence of Unavoidable Delay, Seller shall complete Camino Santa Fe and
the loop road around the Land sufficient so that City has approved or authorized
both for vehicular and pedestrian access within six (6) months after the Close
of Escrow.

                  13.2.2   MECHANIC'S LIEN PROTECTION. If any claim of lien is
recorded which affects the Land and results from Seller's activities or anyone
acting through, or for the benefit of Seller, Seller shall, within 20 days after
such recording or service, (i) pay and discharge the same, (ii) effect the
release thereof by recording or delivering to Buyer a surety bond in form and
amount satisfactory to Buyer, or (iii) provide Buyer with other assurance which
Buyer, in its sole discretion, deems to be satisfactory for the payment of such
lien and for the full and continuous protection of Buyer and the Land from the
effect thereof. If Seller fails to do so, Buyer may pay such lien, or may
contest the validity thereof, paying all costs and expenses of contesting the
same, including attorneys' fees, and all such sums shall be reimbursed by Seller
within ten (10) days after demand therefor.

                  13.2.3   INDEMNITY. Seller shall indemnify, defend and hold
Buyer harmless from liability for any losses, costs (including reasonable
attorneys' fees), claims, liabilities, expenses and demands arising out of any
entry upon the Land by Seller or its contractors during the course of Seller's
post-Closing completion of the Seller Improvements.

                  13.2.4   INSURANCE. Seller shall, at its sole expense,
maintain a policy of commercial general liability insurance, including direct
contractual and contingent liability, with limits of $5,000,000.00 for bodily
injury to, or death of, any one person, $5,000,000.00 for bodily injury to, or
death of, more than one person on an occurrence basis, $5,000,000.00 for
property damage in any one accident, and $5,000,000.00 policy limit for
aggregate operations on an occurrence basis. Such insurance shall name Buyer as
an additional insured, shall provide that the policy is primary and
non-contributing with any other insurance carried by Buyer, and shall contain a
provision that the naming of an additional insured shall not negate any right
the additional insured would have had as claimant under the policy if not so
named.

                  13.2.5   ASSIGNMENT OF ADTs. Effective as of the Close of
Escrow, Seller assigns to Buyer a total of 6,400 ADTs for use in connection with
the use and occupancy of the Land, with peak period trips of 704 in the morning
and 768 in the evening. Seller reserves to itself, for use elsewhere in the
Business Park, any other ADTs approved for the Business Park as part of the
Entitlements. Buyer acknowledges and agrees that Buyer's Project must be planned
within the constraints of the assigned ADTs and peak period trips as specified
herein.

         13.3     POST-CLOSING TEMPORARY CONSTRUCTION LICENSE. The parties
acknowledge that in the course of developing Buyer's Project, Buyer may require
temporary access to other portions of the Carroll Canyon Land for construction
purposes. During and after the term of the Escrow, Seller shall provide the
required access subject to reasonable and ordinary conditions similar to those
set forth in Paragraph 11.2, which shall be embodied in an entry permit or
license agreement prepared by Seller and reasonably approved by Buyer.

                   ARTICLE 14. DELIVERY OF DOCUMENTS; REMEDIES

         14.1     LIMIT ON ESCROW HOLDER'S RESPONSIBILITIES. Escrow Holder shall
have no concern with, nor liability nor responsibility for, this Article.

         14.2     DELIVERY OF DEVELOPMENT PRODUCT. If this Escrow is terminated
for any reason (other than the default of Seller), Buyer shall, within fifteen
(15) days following the termination, deliver to Seller, at no cost

                                      -19-
<Page>

or expense to Seller but without representation or warranty and only to the
extent assignable, all Property Documents, all soils or geotechnical reports and
other studies obtained by Buyer from its third-party consultants, or previously
delivered to Buyer by Seller. All of the foregoing shall be delivered to Seller,
without representation or warranty by Buyer, at no cost or expense to Seller.

         14.3     LIQUIDATED DAMAGES. THE PARTIES AGREE THAT THE PURCHASE PRICE
HAS BEEN DETERMINED NOT ONLY BY A CONSIDERATION OF THE VALUE OF THE LAND PER SE
BUT ALSO BY A CONSIDERATION OF THE VALUE OF THE VARIOUS COVENANTS, CONDITIONS
AND WARRANTIES OF THIS AGREEMENT AS THEY RELATE TO THE LAND. THE IMPLICATIONS OF
SUCH VALUES, SOMETIMES MEASURABLE IN RELATION TO KNOWN EXTERNAL STANDARDS AND
SOMETIMES DETERMINED ONLY BY SUBJECTIVE BUSINESS JUDGMENTS OF THE PARTIES, ARE
ALL INTERRELATED AND AFFECTED BY THE PARTIES' ULTIMATE AGREEMENT UPON THE
PURCHASE PRICE. THE PARTIES HAVE DISCUSSED AND NEGOTIATED IN GOOD FAITH UPON THE
QUESTION OF THE DAMAGES THAT WOULD BE SUFFERED BY SELLER IN THE EVENT BUYER
BREACHES THIS AGREEMENT. THE PARTIES HAVE ENDEAVORED TO REASONABLY ESTIMATE SUCH
DAMAGES AND THEY HEREBY AGREE THAT, BY REASON OF THE AFORESAID CONSIDERATIONS,
(I) SUCH DAMAGES ARE AND WILL BE IMPRACTICABLE OR EXTREMELY DIFFICULT TO FIX,
(II) LIQUIDATED DAMAGES IN THE AMOUNT OF THE ESCROW OPENING DEPOSIT (AND, AFTER
DELIVERY THEREOF, EACH OF THE ADDITIONAL DEPOSITS) ARE AND WILL BE REASONABLE,
(III) IN THE EVENT OF SUCH BREACH, SELLER SHALL RECEIVE THE ESCROW OPENING
DEPOSIT AND (IF DELIVERED) THE ADDITIONAL DEPOSITS AS SUCH LIQUIDATED DAMAGES,
AND (IV) IN CONSIDERATION OF THE PAYMENT OF SUCH LIQUIDATED DAMAGES, SELLER
SHALL BE DEEMED TO HAVE WAIVED ANY AND ALL CLAIMS AT LAW OR IN EQUITY, INCLUDING
ANY CLAIM FOR DAMAGES OR FOR SPECIFIC PERFORMANCE, EXCEPT FOR: (A) CLAIMS FOR
INDEMNITY PURSUANT TO PARAGRAPH 11.2; (B) ACTIONS FOR THE RECOVERY OF THE
DEPOSITS FROM ESCROW HOLDER AS LIQUIDATED DAMAGES OR FOR THE RETURN OF DOCUMENTS
PURSUANT TO PARAGRAPH 14.2; (C) ACTIONS TO EXPUNGE A LIS PENDENS OR OTHERWISE TO
CLEAR TITLE OF ANY LIEN WRONGFULLY FILED OR WRONGFULLY IMPOSED BY BUYER; AND (D)
REASONABLE ATTORNEYS' FEES AND COSTS INCURRED BY SELLER INCIDENT TO CLAUSES (A)
THROUGH (C).

            Seller's Initials            Buyer's Initials
                              -------                    -------

         14.4     BUYER'S REMEDIES. In the event that this Agreement is
terminated or this Escrow is prevented from closing by reason of Seller's
default, Buyer shall be entitled to the return of the Deposits, and Buyer, as
its sole and exclusive remedy, may exercise either of the following: (i) Buyer
may seek specific performance of this Agreement; or (ii) Buyer may bring an
action against Seller to collect actual monetary damages for Seller's breach, in
an amount that does not exceed the lesser of $250,000 or the actual
out-of-pocket expenses incurred by Buyer in connection with this Agreement and
Buyer's investigation of the Land and Buyer's Project.

                         ARTICLE 15. ASSIGNMENT BY BUYER

         15.1     ASSIGNMENT. Buyer acknowledges that a material inducement to
Seller's entry into this Agreement was Buyer's representation that it intends to
develop all of the Land for Buyer's own use as described in Paragraph 1.3. Buyer
shall have no right to assign any or all of Buyer's rights in this Agreement to
any person(s) without Seller's prior written consent, which (i) shall be granted
for an assignment to an affiliate or acquirer by merger of Buyer, or to any
entity which acquires substantially all of the assets of Buyer, (ii) shall not
be unreasonably withheld for an assignment to a joint venture between Buyer and
another entity in the same industry as Buyer, where the assignee will be
developing Buyer's Project on the Land for Buyer's use as contemplated herein,
and (iii) may be granted or withheld at Seller's sole and absolute discretion,
and may be conditioned upon any matters Seller wishes to impose, for any other
proposed assignment. Any permitted assignment may be exercised only by written
assignment executed by Buyer and accepted in writing by the assignee (which
must, in such written acceptance, obligate itself to perform the assignor's
obligations under this Agreement), and delivered to Escrow Holder and Seller
prior to the close of this escrow. Any assignment of Buyer's rights made or
attempted without Seller's consent or without such written assignment and
acceptance shall be void and of no force or effect.

                                      -20-
<Page>

         15.2     EFFECT OF APPROVED ASSIGNMENT. In the event of an approved or
permitted assignment, the assignee will be and become: (i) the grantee of
Seller's Grant Deed; (ii) the beneficiary of any representations, warranties and
covenants made by Seller herein; (iii) the insured owner under the Title Policy;
and (iv) the person(s) having the right or obligation to (a) deliver statements,
(b) deliver documents, (c) give approvals, (d) waive conditions, or (e) make
demands, all as may be permitted or required by this Agreement and not then
already accomplished by Buyer or another approved assignee.

                           ARTICLE 16. EMINENT DOMAIN

         16.1     EMINENT DOMAIN. In the event that prior to the Close of Escrow
all or any material portion of the Land should be taken or appropriated by any
public authority under the power of eminent domain, then Buyer may at its option
terminate this Agreement and Escrow without further liability by delivering
written notice of termination within fifteen (15) days after receiving notice of
the taking or appropriation. Seller shall promptly notify Buyer of any such
taking or appropriation. If Buyer does not exercise its option to terminate and
the Closing actually occurs, then all proceeds of the award for the taking that
are applicable to the Land shall belong to Buyer. Seller assumes all risk of
loss to the Land as a result of casualty thereto up to and through the Closing.

                               ARTICLE 17. NOTICES

         17.1     TIME OF DELIVERY; ADDRESSES. Unless otherwise specifically
provided herein, all notices, demands or other communications given hereunder
shall be in writing and shall be deemed to have been duly delivered upon
confirmed personal delivery, or by Federal Express (or similar reputable express
delivery service), or by confirmed telecopier transmission with back-up copy
mailed the same day, or as of the second business day after mailing by United
States registered or certified mail, return receipt requested, postage prepaid,
addressed as follows:

         If to Seller, to:          H. G. Fenton Company
                                    7588 Metropolitan Drive
                                    San Diego, California 92108
                                    Telephone: (619) 400-0120
                                    Telecopier: (619) 400-0111
                                    Attention: Mr. Michael P. Neal

                                    WITH A COPY TO:
                                    --------------

                                    Mr. David W. Bagley, II
                                    Hecht, Solberg, Robinson & Goldberg LLP
                                    600 West Broadway, 8th Floor
                                    San Diego, California 92102
                                    Telephone: (619) 239-3444
                                    Telecopier: (619) 232-6828

         If to Buyer, to:           Biosite Incorporated
                                    11030 Roselle Street
                                    San Diego, California 92121
                                    Telephone: (858) 597-4815
                                    Facsimile: (858) 642-2512
                                    Attention: Director of Facilities;
                                                  Chief Financial Officer

                                    WITH A COPY TO:
                                    --------------

                                    Mr. Eric A. Kremer
                                    Pillsbury Winthrop LLP
                                    11975 El Camino Real, Suite 200

                                      -21-
<Page>

                                    San Diego, California 92130
                                    Telephone: (858) 509-4021
                                    Telecopier: (858) 509-4010

         If to Escrow Holder, to:   Stewart Title of California, Inc.
                                    3111 Camino del Rio North, Suite 900
                                    San Diego, California 92108
                                    Telephone: (619) 692-1600
                                    Telecopier: (619) 295-2972
                                    Attention: Ms. Patty McHugh
                                    Escrow No.
                                               -------------------

or to such other address or to such other person as any party shall designate to
the others for such purpose in the manner hereinabove set forth.

                       ARTICLE 18. EXCULPATORY PROVISIONS

         18.1     NEGLECT, MISCONDUCT. Escrow Holder shall not be liable for any
of its acts or omissions unless the same constitutes negligence or willful
misconduct.

         18.2     FORM, VALIDITY AND AUTHORITY. Escrow Holder shall not be
responsible for (i) the sufficiency or correctness as to form or the validity of
any document deposited with Escrow Holder, (ii) the manner of execution of any
such deposited document, unless such execution occurs in Escrow Holder's
premises and under its supervision, or (iii) the identity, authority or rights
of any person executing any document deposited with Escrow Holder unless under
Escrow Holder's supervision or control.

         18.3     CONFLICTING INSTRUCTIONS. Upon receipt of any conflicting
instructions, Escrow Holder shall have the right to take no further action until
otherwise directed, either by the parties' mutual written instructions or a
final order or judgment of a court of competent jurisdiction.

         18.4     INTERPLEADER. Escrow Holder shall have the absolute right, at
its election, to file an action in interpleader requiring the parties to answer
and litigate their several claims and rights among themselves, and Escrow Holder
is authorized to deposit with the clerk of the court all documents and funds
held in this Escrow. If such action is filed, the parties shall jointly and
severally pay Escrow Holder's termination charges and costs and reasonable
attorney's fees which Escrow Holder is required to expend or incur in the
interpleader action, the amount thereof to be fixed and judgment therefor to be
rendered by the court; provided, however, that as between themselves, the losing
party shall be solely responsible for any such charges, costs and attorneys'
fees. Upon the filing of such action, Escrow Holder shall be and become fully
released and discharged from all obligations to further perform any obligations
imposed by this Agreement.

         18.5     MISCELLANEOUS. Recordation of any instruments delivered
through this Escrow, if necessary or proper in the issuance of the Title Policy,
is authorized. No examination or insurance as to the amount or payment of real
or personal property taxes is required unless the real property tax is payable
on or before the date of the Title Policy. If any party is seeking to obtain a
loan secured by the Property, then, during the pendency of this Escrow, Escrow
Holder is authorized to furnish the lender, or anyone acting on its behalf, any
information concerning this Escrow, including, but not limited to, a certified
copy of this Agreement and any amendments thereto. If any party uses
facsimile-transmitted signed documents, Escrow Holder is authorized to rely upon
such documents as if they bore original signatures unless written notice to the
contrary is received from any signatory to any such documents; provided,
however, that facsimile-transmitted signed documents will not be accepted for
recordation in the Official Records.

         18.6     ADDITIONAL INSTRUCTIONS. Escrow Holder may request that Buyer
and Seller sign additional instructions related to the Escrow created by this
Agreement. Buyer and Seller agree to be reasonable in reviewing, commenting on,
proposing changes to, approving and entering into any such additional
instructions; provided, however, Seller, Buyer and Escrow Holder agree that in
the event of any conflict or inconsistency between this Agreement and such
additional instructions, the terms, conditions and provisions of this Agreement
shall govern and control.

                                      -22-
<Page>

                         ARTICLE 19. GENERAL PROVISIONS

         19.1     ATTORNEYS' FEES. If either party commences litigation for the
judicial interpretation, reformation, enforcement or rescission of this
Agreement, the prevailing party will be entitled to a judgment against the other
for, and to collect, an amount equal to reasonable attorneys' fees and court and
other costs incurred. The "prevailing party" shall be the party who is entitled
to recover its costs of suit, whether or not the suit proceeds to final
judgment. A party not entitled to recover its costs shall not recover attorneys'
fees. No sum for attorneys' fees shall be counted in calculating the amount of a
judgment for the purposes of determining whether a party is entitled to recover
its costs or attorneys' fees.

         19.2     GENDER, NUMBER. Whenever the context requires, the use herein
of (i) the neuter gender includes the masculine and the feminine, and (ii) the
singular number includes the plural.

         19.3     TIME OF THE ESSENCE. Time is of the essence of each covenant
of this Agreement for which a date of performance is specified.

         19.4     BUSINESS DAYS. If the (i) stated Closing Date (as extended, if
applicable), or (ii) last day for performance of an act falls upon a day during
which Escrow Holder is not open for business, the Closing Date (as extended, if
applicable) or such last day, as the case may be, shall be the next following
Business Day.

         19.5     SURVIVAL OF PROVISIONS. The representations, warranties,
agreements and indemnities set forth in this Agreement shall remain operative,
shall be deemed made at the Close of Escrow, and shall survive the closing and
the execution and delivery of Seller's Grant Deed and shall not be merged in
Seller's Grant Deed.

         19.6     AUTHORITY OF SIGNATORIES. Each individual signing this
Agreement on behalf of a corporation warrants that he or she is duly authorized
to sign and deliver this Agreement on behalf of the corporation, in accordance
with a duly adopted resolution of the board of directors of the corporation or
in accordance with the bylaws of the corporation, and that this Agreement is
binding upon the corporation in accordance with its terms. Each individual
signing this Agreement on behalf of any other entity warrants that he or she is
duly authorized to sign and deliver this Agreement on behalf of the entity,
either with authority under the entity's organizational documents so to sign, or
as the entity's duly authorized agent with authority to bind the entity.

         19.7     CAPTIONS. Captions in this Agreement are inserted for
convenience of reference only and do not define, describe or limit the scope or
the intent of this Agreement.

         19.8     APPLICABLE LAW. This Agreement shall be construed and enforced
in accordance with the laws of the State of California.

         19.9     ENTIRE AGREEMENT. This Agreement contains the entire agreement
between the parties relating to the transaction contemplated hereby and all
prior or contemporaneous agreements, understandings, representations and
statements, oral or written, are merged herein.

         19.10    MODIFICATIONS. No modification, waiver or discharge of this
Agreement shall be valid unless the same is in writing and signed by the party
against which the enforcement of such modification, waiver or discharge is or
may be sought.

         19.11    SUCCESSORS. All terms of this Agreement shall be binding upon
and inure to the benefit of the parties and their respective administrators or
executors, successors and assigns; nothing contained in this Paragraph shall
affect the Article of this Agreement entitled "Assignment by Buyer".

         19.12    INVALIDITY OF MATERIAL PROVISION. If any material covenant,
condition or provision herein contained is held to be invalid, void or
unenforceable by a final judgment of any court of competent jurisdiction, this
Agreement shall become rescinded unless the party benefitted by such covenant,
condition or provision delivers to the other party and Escrow Holder, within
five (5) days after the judgment becomes final, a written

                                      -23-
<Page>

waiver of the covenant, condition or provision, in which case the remainder of
this Agreement shall be enforceable.

         19.13    FURTHER ASSURANCES. Each party to this Agreement, for itself
and its successors and assigns, agrees to take such additional actions and
execute such additional instruments as may be reasonably requested by Escrow
Holder or the other party in order to give effect to the transaction
contemplated hereby.

         19.14    COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all of which
together shall constitute one instrument.

         19.15    EXHIBITS. The following exhibits are attached and are part of
this Agreement:

                       A          Site Plan of Fenton Technology Park
                       B          Form of Seller's Grant Deed
                       C          The Seller Improvements
                       D          The Acceptable Entitlement Approval Conditions
                       E          Assignment of Warranties and Intangible Rights
                       F          Form of Development Declaration

         19.16    SUBMISSION OF AGREEMENT NOT AN OPTION. Submission by Seller of
this Agreement for examination or signature by Buyer shall not constitute an
option to purchase the Land. Accordingly, this Agreement shall not become
effective, and Buyer shall have no rights hereunder or to the Land unless and
until this Agreement is executed by Seller and delivered to Buyer.

         This Agreement has been executed at San Diego, California, as of the
date set forth at the beginning hereof.

SELLER:                                                       BUYER:

H. G. FENTON COMPANY, a California             BIOSITE INCORPORATED, a Delaware
corporation                                    corporation

By                                             By
    ------------------------------                ------------------------------
Its                                            Its
    ------------------------------                ------------------------------

By                                             By
    ------------------------------                ------------------------------
Its                                            Its
    ------------------------------                ------------------------------

                            CONSENT OF ESCROW HOLDER

         The undersigned Escrow Holder hereby agrees to (i) accept the foregoing
Agreement, (ii) be Escrow Holder under the Agreement, and (iii) be bound by the
Agreement in the performance of its duties as Escrow Holder; provided, however,
the undersigned shall have no obligations, liability or responsibility under (a)
this Consent or otherwise, unless and until the Agreement, fully signed by the
parties, has been delivered to the undersigned, or (b) any amendment to said
Agreement unless and until the same is accepted by the undersigned in writing.

Date:                                      STEWART TITLE OF CALIFORNIA, INC.
     ---------------

                                           By
                                             -----------------------------------
                                                 Patty McHugh, Escrow Officer

                                      -24-
<Page>

                                  SCHEDULE 12.2

                                DISCLOSURE ITEMS

Section 12.2.7:   Seller has disclosed that Hanson Aggregates Pacific
                  Southwest, Inc., a Delaware corporation ("Hanson"), the owner
                  of the real property to the east of the Carroll Canyon Land,
                  has expressed CEQA concerns about the planned configuration of
                  Camino Santa Fe as a major collector road.

                                      -25-
<Page>

                                    EXHIBIT B

                           FORM OF SELLER'S GRANT DEED

Recording Requested By

Stewart Title Company

When Recorded Mail To:

Mr. Eric A. Kremer
Pillsbury Winthrop LLP
11975 El Camino Real, Suite 200
San Diego, California 92130

Mail Tax Statement To:

Biosite Incorporated
11030 Roselle Street
San Diego, CA  92121
Attn:  Director of Facilities

                                   GRANT DEED

THE UNDERSIGNED GRANTOR DECLARES:

         In accordance with Section 11932 of the California Revenue and Taxation
         Code, Grantor has declared the amount of the transfer tax which is due
         by a separate statement which is not being recorded with this Grant
         Deed.

         FOR A VALUABLE CONSIDERATION, receipt of which is hereby acknowledged,
H. G. FENTON COMPANY, a California corporation formerly known as H. G. Fenton
Material Company("Grantor"), hereby GRANTS to BIOSITE INCORPORATED, a Delaware
corporation ("Grantee"), the real property in the City of San Diego, County of
San Diego, State of California, more particularly described on Exhibit 1
attached hereto ("Land").

         THIS GRANT DEED is made and accepted upon (i) that certain Declaration
Establishing Covenants, Conditions and Restrictions and Grants of Easements for
Fenton Technology Park, which was recorded in the Office of the County Recorder
of San Diego County on _________, 2002 as Document No. 2002-__________
("Business Park Declaration"); (ii) the Development Declaration made by Grantor,
which is being recorded in the Office of the County Recorder of San Diego County
substantially concurrently herewith, and (iii) all other covenants, conditions,
restrictions, reservations, easements and exceptions of record.

         THIS GRANT DEED includes the right to generate a total of 6,400 average
daily trips, as that term is used by The City of San Diego in measuring and
authorizing traffic generation caused by development ("ADTs"), with peak period
trips of 704 in the morning and 768 in the evening. Grantor reserves to itself,
for use elsewhere within the real property encumbered by or annexable to the
Business Park Declaration described above ("Business Park"), any other ADTs
approved for the Business Park.

Date:                             H. G. FENTON COMPANY, a California corporation
     --------------

                                  By
                                     -------------------------------------------
                                  Its
                                     -------------------------------------------

                                      B-1
<Page>

                                  By
                                     -------------------------------------------
                                  Its
                                     -------------------------------------------

                              [Add acknowledgments]

                                      B-2
<Page>

                             EXHIBIT 1 TO GRANT DEED

                                LEGAL DESCRIPTION

                 [To be attached upon approval of the Final Map]

                                      B-3
<Page>

                                    EXHIBIT C

                               SELLER IMPROVEMENTS

THE SELLER IMPROVEMENTS:

         PRE-CLOSING IMPROVEMENTS. Prior to Closing, Seller will cause the Land
         to be sheet graded in accordance with Seller's soil engineer's
         recommendations and the grading plans, and shall deliver the Grading
         Certifications to evidence completion of the Pre-Closing Improvements.

         OTHER SELLER IMPROVEMENTS. Seller will construct the improvements
         required by the Entitlement Approval Conditions.

                                      C-1
<Page>

                                    EXHIBIT D

                   ACCEPTABLE ENTITLEMENT APPROVAL CONDITIONS

1.       Construction of Camino Santa Fe from its current termination south of
         Fenton Road to connect with the currently paved segment to the north,
         on terms that provide for the payment (or reimbursement to Seller) of
         at least 50% of the construction costs by the owners of the real
         property located east of Camino Santa Fe.

2.       Bonded deferral agreement for the future construction to the west of
         Carroll Canyon Road, which is located south of the Business Park.

3.       Installation of a controlled intersection at both intersections of the
         loop road and Camino Santa Fe, and at the future Carroll Canyon Road
         extension.

4.       Construction of a box culvert at the south end of Camino Santa Fe.

5.       Installation of wet and dry utilities serving the Business Park.

                                      D-1
<Page>

                                    EXHIBIT E

             FORM OF ASSIGNMENT OF WARRANTIES AND INTANGIBLE RIGHTS

                 ASSIGNMENT OF WARRANTIES AND INTANGIBLE RIGHTS

         For valuable consideration, receipt of which is hereby acknowledged, H.
G. FENTON COMPANY, a California corporation ("Assignor") does hereby assign to
BIOSITE INCORPORATED, a Delaware corporation ("Assignee"), to the extent
assignable, all of Assignor's right, title and interest in and to all easements,
appurtenances, privileges, rights, profits and preferences, together with all
intangible rights, warranties, guaranties, contract rights and/or other claims,
permits and licenses, appurtenant to or benefitting the unimproved real property
in the Carroll Canyon area of San Diego, California, consisting of approximately
34.7 gross acres more particularly described as

         Lots 1 through 10, inclusive, and FENTON TECHNOLOGY PARK, in the City
         of San Diego, County of San Diego, State of California, according to
         Map thereof No. _________, filed in the Office of the County Recorder
         of San Diego County on ________________

("Land"); excluding, however, any rights reserved by Assignor as declarant under
the CC&Rs or in Seller's Grant Deed (as those terms are defined in the Purchase
Agreement described below).

         Assignor also assigns to Assignee a total of 6,400 ADTs (as defined in
the Purchase Agreement) for use in connection with the use and occupancy of the
Land, with peak period trips of 704 in the morning and 768 in the evening.

         This Assignment is made pursuant to that certain Purchase Agreement and
Escrow Instructions dated as of December 7, 2001 between Assignor as Seller and
Assignee as Buyer ("Purchase Agreement"), which is incorporated herein by this
reference. The enumeration of any of the foregoing categories of personal
property shall not be deemed a representation or warranty by Assignor as to the
existence of any such property, and except as set forth in the Purchase
Agreement, Assignor makes no warranties of any kind or nature, express or
implied, regarding the assigned interests.

Date:                             ASSIGNOR:
     -----------------

                                  H. G. FENTON COMPANY, a California corporation

                                  By
                                     -------------------------------------------
                                  Its
                                     -------------------------------------------

                                  By
                                     -------------------------------------------
                                  Its
                                     -------------------------------------------

                                      E-1
<Page>

                                    EXHIBIT F

                         FORM OF DEVELOPMENT DECLARATION

Recording Requested By:

When Recorded Return To:

HECHT, SOLBERG, ROBINSON & GOLDBERG LLP
Attn: David W. Bagley, II
600 West Broadway, Eighth Floor
San Diego, California 92101

                           DECLARATION OF DEVELOPMENT
                     COVENANTS, CONDITIONS AND RESTRICTIONS

                        FENTON TECHNOLOGY PARK, LOTS 1-10

         This DECLARATION OF DEVELOPMENT COVENANTS, CONDITIONS AND RESTRICTIONS
("Declaration") is made as of _______________, 2002 by H. G. FENTON COMPANY, a
California corporation which acquired title as H. G. Fenton Material Company
("Declarant"), with reference to the following:

                                    RECITALS

         A.       Declarant owns that certain real property located in the Mira
Mesa community of the City of San Diego, County of San Diego, State of
California, more particularly described on EXHIBIT A attached hereto and by this
reference made a part hereof ("Land").

         B.       Declarant intends to convey the Land pursuant to that certain
Purchase Agreement and Escrow Instructions dated as of December 7, 2001
("Purchase Agreement"), between Declarant as "Seller" and BIOSITE INCORPORATED,
a Delaware corporation ("Biosite"), as "Buyer". By this reference, the Purchase
Agreement is incorporated herein, the same as if set forth in its entirety.
Initially capitalized terms not otherwise defined herein shall have the same
meanings as in the Purchase Agreement.

         C.       The Land is a portion of Declarant's larger holdings in the
Mira Mesa area of San Diego, which include the real property described on
EXHIBIT B attached hereto and by this reference made a part hereof ("Benefitted
Land").

         D.       Declarant wishes to subject the Land to certain covenants set
forth in the Purchase Agreement, for the benefit of the Benefitted Land.
Declarant intends that the provisions of this Declaration will be restrictive
covenants made pursuant to Section 1468 of the California CIVIL CODE.

         NOW, THEREFORE, Declarant hereby covenants and declares that the Land
shall be held and conveyed subject to the following covenants, conditions and
restrictions. These covenants, conditions and restrictions shall run with the
Land or any portion into which it may be divided until released as provided
herein and shall be binding upon all parties having or acquiring any right or
title in the Land or any part thereof, and subject to any restrictions set forth
below, shall inure to the benefit of the fee owners of the Benefitted Land

                                      F-1
<Page>

and are imposed upon the Land and every part thereof as a servitude in favor of
the Benefitted Land and every portion thereof as the dominant tenement.

         1.       FORMATION OF ASSESSMENT DISTRICT. Paragraph 7.5 of the
Purchase Agreement relates to the formation of an assessment district by Seller
to finance the costs of certain infrastructure improvements, and includes in
Paragraph 7.5.3 the following covenants, which shall be covenants running with
the Land:

                             "7.5.3 POST-CLOSING FORMATION OF ASSESSMENT
         DISTRICT. If the Assessment District has not been formed as of the
         Close of Escrow, for a period of three (3) years after the Close of
         Escrow (or until such earlier time as Seller notifies Buyer in writing
         that Seller will not be seeking the Land's inclusion within an
         Assessment District), Buyer shall cooperate as reasonably requested by
         Seller in forming the Assessment District following the Close of
         Escrow, including, without limitation, voting in favor of the formation
         thereof in the manner and at the times as are determined by Seller in
         its sole discretion. Upon the determination of the exact amount of the
         Land's share of the assessment, Seller shall reimburse Buyer, in Cash,
         for the amount that would have been the Assessment District Credit;
         provided, however, that Buyer shall have no obligation to subject the
         Land to the Assessment District unless and until Seller provides Buyer
         a letter of credit issued by a bank reasonably approved by Buyer (or
         other security reasonably satisfactory to Buyer) in the amount
         reasonably estimated by Seller and approved by Buyer as the likely
         amount of the Assessment District Credit, as security for Seller's
         reimbursement obligation. Upon the expiration of the three-year period
         after the Close of Escrow, or following Seller's written notification
         to Buyer that Seller will not be seeking the Land's inclusion within an
         Assessment District, Buyer shall have no further obligation to
         cooperate with Seller's efforts to form the Assessment District. Until
         such time, and subject to Buyer's receipt of the letter of credit or
         other security:

                                    "(a) Buyer shall not file any written or
                  oral protest or opposition of any kind to the formation of the
                  Assessment District or the levying of liens, assessments,
                  taxes, special taxes, exactions, fees, and/or charges
                  (collectively "Impositions") through the Assessment District.

                                    "(b) Buyer shall consent to, or, if an
                  election is called, cast its vote in favor of the Assessment
                  District and the levying of Impositions by the Assessment
                  District.

                                    "(c) Buyer shall not take any action that
                  would in any way interfere with the formation of the
                  Assessment District or decisions made or actions taken by
                  Seller with respect to the Assessment District or the bond
                  financing relating thereto, including, without limitation, the
                  timing of commencement of Impositions, the amount of
                  Impositions, the spreading of Impositions and the use of the
                  Impositions collected by the Assessment District.

                                    "(d) To the extent any owner of record of
                  the Land has the right to protest the formation of the
                  Assessment District, those rights shall be held solely by
                  Seller. Upon the request of Seller, Buyer shall grant Seller
                  its proxy to vote its interest as a landowner in any election
                  involving the Assessment District."

         2.       COVENANTS RUNNING WITH THE LAND. The matters described in
Paragraph 1 above shall be a burden upon the Land that will survive the
conveyance of the Land or any portion thereof by Buyer to any transferee, and
will be enforceable for a period ending upon the earlier of three (3) years
following recordation of this Declaration or Declarant's conveyance of the
Benefitted Land to an unaffiliated third party, at which time this Declaration
shall terminate as to all of the Land, without further action by either party.

         3.       OTHER PROVISIONS.

                  a.       The term Buyer, as used in this Declaration, shall
refer to Biosite and to its successors in interest as owners of the Land. Each
successive owner, during its ownership of any portion of

                                      F-2
<Page>

the Land, and each person having any interest in the Land derived through any
such successive owner, shall be bound hereby for the benefit of the Benefitted
Land.

                  b.       Any violation of the provisions herein contained will
be deemed to be a continuing violation and no delay in the delivery of any
notice of any violation hereof or in the enforcement of any rights or the
seeking of any remedies provided hereunder will constitute, or be deemed to
constitute, a waiver of the right to give such notice, enforce such right or
seek such remedy at any time after the occurrence of such violation.

                  c.       No breach or violation of the terms of the
Declaration shall defeat or render invalid the lien of any mortgage, deed of
trust or similar instruments securing a loan made in good faith and for value
concerning the development or permanent financing of the Land or any portion
thereof.

                  d.       This Declaration may be modified or extinguished by
an instrument in writing signed, acknowledged and recorded by Declarant, and
will be automatically extinguished, without action by Declarant, upon the
earlier of three (3) years following recordation of this Declaration or Seller's
conveyance of the Benefitted Land to an unaffiliated third party. If termination
occurs because of the conveyance of the Benefitted Land to an unaffiliated third
party, Declarant Seller shall upon request by Buyer record an instrument
evidencing termination of this Declaration.

                  e.       The provisions herein contained are covenants and are
for the benefit of each party's land and have been made with the intent of
satisfying the requirements of California CIVIL CODE Section 1468.

         IN WITNESS WHEREOF, Declarant has signed and made this Declaration as
of the date first above written.

DECLARANT:                 H. G. FENTON  COMPANY, a California corporation which
                           acquired title as H. G. Fenton Material Company

                           By
                              --------------------------------------------------
                           Its
                              --------------------------------------------------

                           By
                              --------------------------------------------------
                           Its
                              --------------------------------------------------

[Add acknowledgments and legal descriptions of the Land and the Benefitted Land]

                                      F-3

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