MATRIX PHARMACEUTICAL INC/DE
10-Q, 1998-05-11
PHARMACEUTICAL PREPARATIONS
Previous: DURA PHARMACEUTICALS INC, 10-Q, 1998-05-11
Next: ECOSCIENCE CORP/DE, PREM14A, 1998-05-11





                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 10-Q


(X)    QUARTERLY  REPORT  PURSUANT  TO  SECTION  13 OR 15(d)  OF THE  SECURITIES
       EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 1998

                                       OR

( )    TRANSITION  REPORT  PURSUANT  TO  SECTION  13 OR 15(d) OF THE  SECURITIES
       EXCHANGE ACT OF 1934



Commission File number:    0-19750
                           -------


                           MATRIX PHARMACEUTICAL, INC.
             (Exact name of registrant as specified in its charter)



              Delaware                                         94-2957068
   (State or other jurisdiction of                          (I.R.S. Employer
    incorporation or organization)                          Identification No.)


  34700 Campus Drive, Fremont, California                        94555
  (Address of principal executive offices)                     (Zip  Code)



       Registrant's telephone number, including area code: (510) 742-9900




Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceeding 12 months (or for such shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.


                                 Yes X     No
                                    ---      ---

Number of shares of Common Stock,  $.01 par value,  outstanding  as of March 31,
1998: 21,933,765.



<PAGE>


                           MATRIX PHARMACEUTICAL, INC.

                                      INDEX





PART I.  FINANCIAL INFORMATION                                          Page No.


Item 1.  Financial Statements


         Condensed Consolidated Balance Sheets -
         March 31, 1998 and December 31, 1997                              3

         Condensed Consolidated Statements of Operations -
         Three Months Ended March 31, 1998 and 1997                        4

         Condensed Consolidated Statements of Cash Flows -
         Three Months Ended March 31, 1998 and 1997                        5

         Notes to Condensed Consolidated Financial Statements              6


Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                               9


Item 3.  Quantitative and Qualitative Disclosures About Market Risk       11


PART II. OTHER INFORMATION

         Risk Factors                                                     12

Item 6.  Exhibits and Reports on Form 8-K                                 20

         Signature                                                        21

                                                                               2

<PAGE>


<TABLE>
                                                     MATRIX PHARMACEUTICAL, INC.
                                                    (a development stage company)

                                                Condensed Consolidated Balance Sheets
<CAPTION>
                                                                                                          (In thousands)

                                                                                                   March 31,            December 31,
                                                                                                     1998                   1997
                                                                                                   ---------              ---------
<S>                                                                                                <C>                    <C>      
Assets                                                                                            (Unaudited)                 (*)
Current assets:
      Cash and cash equivalents                                                                    $  25,111              $  19,719
      Short-term investments                                                                          40,345                 40,666
      Other current assets                                                                             1,872                  2,128
                                                                                                   ---------              ---------
             Total current assets                                                                     67,328                 62,513

Property and equipment, net                                                                           14,668                 26,742
Non-current investments                                                                               20,008                 19,983
Deposits and other assets, net                                                                         1,538                  1,191
                                                                                                   ---------              ---------
                                                                                                   $ 103,542              $ 110,429
                                                                                                   =========              =========

Liabilities and Stockholders' Equity

Current liabilities:
      Accounts payable                                                                             $   1,800              $   2,800
      Accruals for special charge                                                                      1,103                  2,063
      Accrued clinical trial costs                                                                     1,382                  1,788
      Other accrued liabilities                                                                        2,828                  2,681
      Current portion of debt and capital lease obligations                                            2,276                  2,283
                                                                                                   ---------              ---------
             Total current liabilities                                                                 9,389                 11,615
Non-current portion of debt and capital lease obligations                                             16,007                 20,248
Deferred other income                                                                                  5,365                  1,913
                                                                                                   ---------              ---------
             Total long-term liabilities                                                              21,372                 22,161

Stockholders' equity
      Capital Stock                                                                                  225,214                225,144
      Notes receivable from shareholders                                                              (2,313)                (2,313)
      Other                                                                                             (477)                  (558)
      Deficit accumulated during the development stage                                              (149,643)              (145,620)
                                                                                                   ---------              ---------
             Total stockholders' equity                                                               72,781                 76,653
                                                                                                   ---------              ---------
                                                                                                   $ 103,542              $ 110,429
                                                                                                   =========              =========
<FN>
(*) Derived from audited financial statements.

                                                       See accompanying notes
</FN>

                                                                                                                                   3

</TABLE>

<PAGE>


                           MATRIX PHARMACEUTICAL, INC.
                          (a development stage company)

                 Condensed Consolidated Statements of Operations

                    (In thousands, except per share amounts)


                                                           Three Months Ended
                                                               March 31,
                                                           1998          1997
                                                         --------      --------
                                                       (Unaudited)   (Unaudited)

Revenues                                                 $   --        $   --

Costs and expenses:
   Research and development                                 5,504         6,545
   General and administrative                               1,480         3,622
                                                         --------      --------
     Total costs and expenses                               6,984        10,167
                                                         --------      --------

Loss from operations                                       (6,984)      (10,167)

Gain on sale and leaseback transaction                      1,887          --
Interest and other income, net                              1,074         1,666
                                                         --------      --------

Net loss                                                 $ (4,023)     $ (8,501)
                                                         ========      ========

Basic and diluted net loss per common share              $  (0.18)     $  (0.40)
                                                         ========      ========

Weighted average shares used in computing
basic and diluted net loss per common share                21,921        21,259
                                                         ========      ========

                             See accompanying notes

                                                                               4

<PAGE>


<TABLE>
                                                     MATRIX PHARMACEUTICAL, INC.
                                                    (a development stage company)

                                           Condensed Consolidated Statements of Cash Flows
                                          Increase (Decrease) in Cash and Cash Equivalents

                                                           (In thousands)
<CAPTION>

                                                                                                           For the three months
                                                                                                            ended March 31,
                                                                                                       1998                  1997
                                                                                                     --------              --------
                                                                                                    (Unaudited)          (Unaudited)
<S>                                                                                                  <C>                   <C>      
Cash flows from operating activities:
       Net loss                                                                                      $ (4,023)             $ (8,501)
       Adjustments to reconcile net loss to
        net cash used by operating activities:
         Depreciation, amortization, and other                                                            568                   335
         Gain on sale and leaseback transaction                                                        (1,887)                 --
       Changes in assets and liabilities:
         Inventory                                                                                       --                  (1,114)
         Other changes in assets and liabilities                                                       (2,745)                 (559)
                                                                                                     --------              --------
          Net cash (used for) operating activities                                                     (8,087)               (9,839)
Cash flows from investing activities:
       Capital expenditures                                                                              (419)                 (843)
       Proceeds from sale of fixed assets                                                              17,744                  --
       Investment in securities available-for-sale                                                     (5,175)                 --
       Maturities of investments                                                                        5,500                  --
                                                                                                     --------              --------
         Cash flows provided by (used for) investing activities                                        17,650                  (843)
Cash flows from financing activities:
       Payments on debt and capital lease obligations                                                 (10,248)                  (92)
       Net cash proceeds from issuance of:
         Debt financing                                                                                 6,000                  --
         Capital stock                                                                                     77                    71
                                                                                                     --------              --------
         Cash flows (used for) financing activities                                                    (4,171)                  (21)
Net decrease in cash and cash equivalents                                                               5,392               (10,703)
Cash and cash equivalents at the beginning of period                                                   19,719                20,138
                                                                                                     ========              ========
Cash and cash equivalents at the end of period                                                       $ 25,111              $  9,435
                                                                                                     ========              ========

<FN>
                                                       See accompanying notes
</FN>

                                                                                                                                   5

</TABLE>


<PAGE>


                           MATRIX PHARMACEUTICAL, INC.


              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                                 March 31, 1998


1.       Basis of presentation

                  The condensed consolidated balance sheet as of March 31, 1998,
         the  condensed  consolidated  statements  of  operations  for the three
         months ended March 31, 1998 and 1997,  and the  condensed  consolidated
         statements  of cash flows for the three months ended March 31, 1998 and
         1997, have been prepared by the Company,  without audit. In the opinion
         of management,  all  adjustments  (which include only normal  recurring
         adjustments)  necessary  to  present  fairly  the  financial  position,
         results of  operations,  and cash  flows at March 31,  1998 and for all
         periods  presented have been made. The condensed  consolidated  balance
         sheet at December 31, 1997 has been derived from the audited  financial
         statements at that date.

                  Certain information and footnote disclosures normally included
         in financial  statements prepared in accordance with generally accepted
         accounting  principles  have been condensed or omitted  pursuant to the
         Securities and Exchange Commission's rules and regulations.

                  The  condensed   financial   statements   should  be  read  in
         conjunction with the Company's audited financial statements as included
         in the Company's Annual Report on Form 10-K for the year ended December
         31, 1997 as filed with the  Securities  and  Exchange  Commission.  The
         results of operations for the three months ended March 31, 1998 are not
         necessarily indicative of the results to be expected for any subsequent
         quarter or for the entire fiscal year ending December 31, 1998.

2.       Principles of consolidation

                  The condensed  consolidated  financial  statements include the
         accounts  of  the  Company  and  its  wholly  owned   subsidiary  after
         elimination of all material intercompany balances and transactions.

3.       Basic and diluted net loss per common share

                  Basic and  diluted  net loss per common  share is  computed in
         conformance with Statement of Financial  Accounting  Standards No. 128,
         Earnings Per Share  (Statement  128),  which the Company adopted during
         1997.  Accordingly,  the  weighted  average  number of shares of common
         stock outstanding are used while common stock  equivalents,  consisting
         of stock options,  are excluded from the computation as their impact is
         anti-dilutive.

4.       Cash and cash  equivalents,  short-term  investments,  and  non-current
         investments

                  The  Company   invests  its  excess  cash  in  government  and
         corporate debt securities. Highly liquid investments with maturities of
         three months or less at the date of  acquisition  are considered by the
         Company to be cash  equivalents.  Investments  with  maturities  beyond
         three months at the date of acquisition and that mature within one year
         from  the  balance   sheet  date  are 

                                                                               6

<PAGE>

         considered to be short-term  investments.  Investments  with maturities
         longer  than one year from the  balance  sheet date are  classified  as
         short-term   investments  or  non-current   investments  based  on  the
         Company's intended holding period.

                  The Company determines the appropriate  classification of debt
         securities at the time of purchase and reevaluates  such designation as
         of each balance sheet date. Debt securities which are not classified as
         held-to-maturity  and which are not held for resale in  anticipation of
         short-term  market  movements  are  classified  as  available-for-sale.
         Available-for-sale  securities  are  carried  at fair  value,  with the
         unrealized  gains  and  losses,  net of  tax,  reported  as a  separate
         component  of  stockholders'  equity.  Realized  gains and  losses  and
         declines in value  judged to be  other-than-temporary  are  included in
         interest and other income.  The cost of securities sold is based on the
         specific identification method.

5.       Gain on sale and leaseback transaction

                  In March 1998,  the Company  closed an  agreement  with a real
         estate  investment  trust for the sale and  leaseback  of its San Diego
         office/laboratory and manufacturing  facility and an adjacent parcel of
         land. The transaction  was structured as an $18,400,000  purchase and a
         $6,000,000  convertible loan secured by specific  manufacturing related
         building  improvements.  Under the terms of the agreement,  the Company
         will lease the  facility for 13 years with the option to renew up to an
         additional  25 years.  The Company will pay  $2,600,000 in annual lease
         and interest  expense,  which will be partially offset by rental income
         from  a  portion   of  the   facility   currently   leased  to  another
         pharmaceutical  company.  Net cash  from the sale and loan  agreements,
         after the payment of the existing mortgage and escrow and other related
         fees,  totals  approximately  $14,000,000  and  will  be  used  to fund
         operating  expenses  and  capital  purchases.   The  net  gain  on  the
         transaction is $5,774,000 of which  $1,887,000  has been  recognized in
         the first quarter.  The balance will be deferred and recorded as income
         over the 13-year lease term.

6.        Subsequent Event

                  In  April  1998,  the  Company  received  $4,000,000  from  an
         insurance  company for the  reimbursement  of legal  expenses  incurred
         during prior years. The payment settles  litigation between the Company
         and the insurer over  coverage  under the Company's  general  liability
         policy.  The payment  will be  recorded  as other  income in the second
         quarter of 1998.

7.       New accounting pronouncements

                  As  of  January  1,  1998,  the  Company   adopted   Financial
         Accounting   Standards  Board's   Statement  of  Financial   Accounting
         Standards Statement No. 130, Reporting  Comprehensive Income (Statement
         130). Statement 130 establishes new rules for the reporting and display
         of comprehensive  income and its components;  however,  the adoption of
         this   Statement   had  no  impact  on  the  Company's  net  income  or
         shareholder's equity. Statement 130 requires unrealized gains or losses
         on the Company's  available-for-sale  securities  and foreign  currency
         translation   adjustments,   which  prior  to  adoption  were  reported
         separately   in   shareholders'   equity  to  be   included   in  other
         comprehensive   income.  Prior  year  financial  statements  have  been
         reclassified to conform to requirements of Statement 130.

                  During the first quarter of 1998 and 1997, total comprehensive
         loss amounted to $4,023,000 and $8,764,000 respectively.

                                                                               7

<PAGE>

                  Effective  January 1, 1998, the Company  adopted the Financial
         Accounting   Standards  Board's   Statement  of  Financial   Accounting
         Standards No. 131,  Disclosures  about  Segments of an  Enterprise  and
         Related  Information  (Statement  131).  Statement 131 superseded  FASB
         Statement  No.  14,  Financial  Reporting  for  Segments  of a Business
         Enterprise. Statement 131 establishes standards for the way that public
         business  enterprises  report  information about operating  segments in
         annual financial  statements and requires that those enterprises report
         selected  information  about  operating  segments in interim  financial
         reports.   Statement  131  also   establishes   standards  for  related
         disclosures  about products and services,  geographic  areas, and major
         customers.  The adoption of Statement 131 did not affect the results of
         operations,   financial   position,   or  the   disclosure  of  segment
         information.

                                                                               8

<PAGE>


Item 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF CONSOLIDATED FINANCIAL CONDITION
AND RESULTS OF OPERATIONS.

         This Form 10-Q may  contain,  in  addition to  historical  information,
forward-looking statements,  including without limitation,  statements regarding
the timing and outcome of  regulatory  reviews  and  clinical  trials.  Any such
forward-looking  statements are based on management's  current  expectations and
are  subject  to a number of risks and  uncertainties  that could  cause  actual
results to differ materially from expected results. For additional  information,
including  risk  factors,   such  as  no  assurance  of  regulatory   approvals;
uncertainties  associated  with  clinical  trials;  history  of  losses;  future
profitability uncertain;  additional financing requirements and uncertain access
to capital markets;  limited  manufacturing and sales and marketing  experience;
dependence on sources of supply;  uncertainty  regarding patents and proprietary
rights; rapid technological change and substantial  competition;  uncertainty of
pharmaceutical pricing; no assurance of adequate reimbursement;  dependence upon
qualified and key  personnel;  product  liability  exposure;  limited  insurance
coverage;  hazardous materials and product risks;  volatility of stock price; no
dividends;  anti-takeover provisions; year 2000 compliance, please see the "Risk
Factors"  section included in the Company's 1997 Form 10-K and in this Form 10-Q
as well as other factors discussed below and elsewhere in this report.


Results of Operations

Three Months Ended March 31, 1998 and 1997

         Since  the  Company's  inception  in  1985,  the  primary  focus of its
operations has been research and  development,  and to date, it has not received
any revenues from the commercial sale of products.  The Company has a history of
operating  losses and expects to incur  substantial  additional  losses over the
next several years as it continues to develop its products.  For the period from
its inception to March 31, 1998,  the Company has incurred a cumulative net loss
of $149,643,000.

         The Company had no revenue in either of the first  quarters of 1998 and
1997.

         Research  and  development  expenses  for  the  first  quarter  of 1998
decreased by 16% to $5,504,000  as compared to $6,545,000  for the first quarter
of  1997.  The  decrease  was  primarily  due  to  lower  personnel  costs,  the
termination  of clinical  trials for  AccuSite(TM)  Injectable Gel which were in
progress during the first quarter of 1997, lower purchases of operation supplies
and materials,  and lower consulting expenses. The decrease was partially offset
by the transfer of certain  production  expenses to  inventory  during the first
quarter of 1997 when the Company marketed AccuSite in the United Kingdom.

         General  and  administrative  expenses  for the first  quarter  of 1998
decreased by 59% to $1,480,000  as compared to $3,622,000  for the first quarter
of 1997.  This decrease was principally  due to lower  litigation-related  legal
expenses and the absence of  AccuSite-related  product marketing expenses during
the first quarter of 1998.

         In March  1998,  the  Company  closed an  agreement  with a real estate
investment  trust for the sale and leaseback of its San Diego  office/laboratory
and  manufacturing  facility and an adjacent parcel of land. The transaction was
structured as an $18,400,000 purchase and a $6,000,000  convertible loan secured
by specific manufacturing related building improvements.  Under the terms of the
agreement,  the Company  will lease the facility for 13 years with the option to
renew up to an  additional 25 years.  The Company will pay  $2,600,000 in annual
lease and interest expense, which will be partially offset by 

                                                                               9

<PAGE>

rental  income  from a portion  of the  facility  currently  leased  to  another
pharmaceutical  company.  Net cash from the sale and loan agreements,  after the
payment of the  existing  mortgage  and escrow and other  related  fees,  totals
approximately  $14,000,000  and  will be used to  fund  operating  expenses  and
capital  purchases.  The net  gain on the  transaction  is  $5,774,000  of which
$1,887,000  has been  recognized  in the  first  quarter.  The  balance  will be
deferred and recorded as income over the 13-year lease term.

         Net  interest and other income  decreased to  $1,074,000  for the first
quarter of 1998 as compared to $1,666,000  for the first  quarter of 1997.  This
decrease was primarily the result of a decline in interest  income for the first
quarter  1998 due to  lower  average  balances  in cash,  cash  equivalents  and
marketable  securities.  In addition,  interest expense  increased for the first
quarter  1998 as compared to the similar  period in 1997 as the result of higher
debt balances.


         Liquidity and Capital Resources

         At  March  31,  1998,  the  Company  had   $85,500,000  in  cash,  cash
equivalents and marketable  securities,  compared to $80,400,000 at December 31,
1997.  The net increase of  $5,100,000 is primarily due to the proceeds from the
sale and leaseback  transaction as well as interest income and rental  receipts,
net of cash  disbursements  used  primarily  to fund  operating  activities  and
capital purchases.

         In April  1998,  the  Company  received  $4,000,000  from an  insurance
company for the reimbursement of legal expenses incurred during prior years. The
payment  settles  litigation  between the Company and the insurer over  coverage
under the Company's general  liability  policy.  The payment will be recorded as
other income in the second quarter of 1998.

         As discussed  in "Results of  Operations,"  in March 1998,  the Company
closed  an  agreement  with a real  estate  investment  trust  for the  sale and
leaseback of its San Diego  facility and an adjacent  parcel of land and entered
into a loan  agreement.  Net cash  from the sale and loan  agreement,  after the
payment of the  existing  mortgage  and escrow and other  related  fees,  totals
approximately  $14,000,000  and  will be used to  fund  operating  expenses  and
capital purchases.

         In  September  1995,  the  Company  repurchased  from  Medeva  PLC  all
marketing rights related to its AccuSite product for $2,000,000, to be paid over
a period of five years.  As of March 31,  1998,  the  remaining  balance of this
obligation was $1,500,000.

         The Company has financed its operations and capital asset  acquisitions
from its inception through the sale of equity  securities,  interest income, and
capital lease and debt  financing.  The Company expects to finance its continued
operating  requirements  principally  with  cash on  hand as well as  additional
capital  that  may  be  generated   through  equity  and  debt   financings  and
collaborative agreements.

         The Company's  working capital and capital  requirements will depend on
numerous  factors,   including  the  progress  of  the  Company's  research  and
development  programs,  preclinical  testing and clinical trial activities,  the
timing and cost of obtaining regulatory approvals,  the levels of resources that
the  Company  devotes  to  the  development  of   manufacturing   and  marketing
capabilities, technological advances and the status of competitors.

         The Company expects to incur  substantial  additional costs relating to
the continued clinical development of its oncology products,  continued research
and development  programs,  the development of manufacturing  capabilities,  and
general working capital requirements.  The Company anticipates that

                                                                              10

<PAGE>

its existing and  committed  capital  resources,  including  the proceeds of its
April 1996 public offering,  October 1997 equipment financing,  and recent sales
and  leaseback  agreement,  will enable it to  maintain  its current and planned
operations  at least through 1999.  The Company may require  additional  outside
financing to complete the process of bringing  current  products to market,  and
there can be no  assurance  that such  financing  will be available on favorable
terms, if at all.

Year 2000 Compliance

         The Company is aware of the issues associated with the programming code
in existing computer systems as the millennium (year 2000) approaches. The "year
2000" problem is pervasive  and complex as virtually  every  computer  operation
will be affected in some way by the  rollover of the two digit year value to 00.
The issue is whether  computer  systems will properly  recognize  date sensitive
information  when  the  year  changes  to  2000.  Systems  that do not  properly
recognize such  information  could generate  erroneous data or cause a system to
fail.

         During 1997,  the Company  installed a new  accounting  system that was
confirmed by the vendor to address the year 2000 related  issues.  However,  the
Company  has not  analyzed  the  external  factors,  such as the impact on those
vendors  adversely  affected by the year 2000 issue,  and has not  assessed  the
related  potential  effect on the  Company's  business,  financial  condition or
results of  operations.  There can be no  assurance  that  computer  systems and
applications of other  companies on which the Company's  operations rely will be
converted  in a timely  fashion,  or that such  failure  to  correct  by another
company would not have a material adverse effect on the Company.

Item 3.  Quantitative and Qualitative Disclosures About Market Risk

         Not applicable.

                                                                              11

<PAGE>


                           PART II. OTHER INFORMATION

                                  RISK FACTORS


No Assurance of Regulatory Approvals

         The preclinical and clinical testing,  manufacturing,  and marketing of
the  Company's  products  are  subject  to  extensive   regulation  by  numerous
governmental  authorities in the United States and other  countries,  including,
but not  limited  to,  the Food and Drug  Administration  ("FDA").  Among  other
requirements,  FDA  approval of the  Company's  product  candidate,  including a
review of its  manufacturing  processes and production  facilities,  is required
before such product  candidate may be marketed in the United States.  Similarly,
marketing  approval by a foreign  governmental  authority is typically  required
before such products may be marketed in a particular foreign country. Matrix has
no products approved by the FDA and one product approved by foreign  authorities
and does not  expect to  achieve  profitable  operations  unless  other  product
candidates now under development receive FDA and foreign regulatory approval and
are thereafter commercialized successfully.

         In order to obtain FDA approval,  the Company must  demonstrate  to the
satisfaction  of the FDA  that  the  Company's  product  candidate  is safe  and
effective for its intended uses and is manufactured in conformity with the FDA's
Current Good Manufacturing  Practices ("cGMP") regulations.  The Company has had
only limited experience in submitting and pursuing regulatory applications.  The
process of obtaining FDA approvals can be costly, time consuming, and subject to
unanticipated  delays.  There can be no assurance  that such  approvals  will be
granted to the Company on a timely basis, or at all.

         The process of obtaining FDA regulatory  approval  involves a number of
steps that, taken together,  may involve seven years or more from the initiation
of clinical trials and require the expenditure of substantial  resources.  Among
other  requirements,  this process  requires that the product undergo  extensive
preclinical  and  clinical  testing  and  that  the  Company  file  an New  Drug
Application  ("NDA") requesting FDA approval.  When a product contains more than
one  component  that  contributes  to the  product's  effect,  as do some of the
Company's current product  candidates,  the FDA may request that additional data
be submitted in order to demonstrate the  contribution of each such component to
clinical efficacy. In addition,  when there has been a manufacturing change in a
product  component (either in the process by which the component is manufactured
or the site at which it is manufactured) during product  development,  as is the
case with the collagen gel used in the Company's  products,  the FDA may request
that additional data be submitted to demonstrate that the  manufacturing  change
has not affected  the clinical  performance  of the  product.  In addition,  the
manufacturing facilities for a product must be inspected and accepted by the FDA
as being in compliance with cGMP  regulations  prior to approval of the product.
During  the  first  quarter  of  1998,  the  Company  closed  its  manufacturing
facilities in San Jose and Milpitas,  California and consolidated  manufacturing
personnel  at the  Company's  San  Diego  production  facility.  There can be no
assurance that the Company's San Diego  manufacturing  facility will be accepted
by the FDA in the future,  and failure to receive or  maintain  such  acceptance
would have a material adverse effect on the Company's business.

         The Company's analysis of the results of its clinical studies submitted
as part of an NDA is subject to review and  interpretation by the FDA, which may
differ from the Company's analysis. There can be no assurance that the Company's
data or its  interpretation  of data will be accepted  by the FDA. In  addition,
changes in applicable law or FDA policy during the period of product development
and FDA  regulatory  review may result in the delay or rejection of an NDA filed
by the Company.  Any failure to obtain,  or delay in  obtaining,  FDA  approvals
would  adversely  affect  the  ability of the  Company  to

                                                                              12

<PAGE>

market its proposed products.  Moreover,  even if FDA approval is granted,  such
approval  may include  significant  limitations  on  indicated  uses for which a
product could be marketed.

         Before and after approval is obtained, a product, its manufacturer, and
the holder of the NDA for the product are  subject to  comprehensive  regulatory
oversight.  Violations of regulatory  requirements  at any stage,  including the
preclinical  and  clinical  testing  process,  the  approval  process  or  after
approval,  may  result in adverse  consequences,  including  the FDA's  delay in
approving  or refusal to approve a product,  withdrawal  of an approved  product
from the  market,  and/or the  imposition  of  criminal  penalties  against  the
manufacturer  and/or the NDA holder.  In addition,  the subsequent  discovery of
previously  unknown  problems  relating  to a  marketed  product  may  result in
restrictions  on  such  product,  manufacturer,  or the  NDA  holder,  including
withdrawal of the product from the market. Also, new government requirements may
be established that could delay or prevent regulatory  approval of the Company's
products under development.

         Matrix  filed  an NDA for  AccuSite  Injectable  Gel for  treatment  of
condyloma  (genital  warts) with the FDA in 1995.  The FDA has issued two action
(non-approvable)  letters with respect to the Company's  application.  An action
letter  received in September 1997 reiterated  concerns  expressed by the FDA in
December 1996 about the safety profile of AccuSite and, in particular, about the
persistence in certain  AccuSite-treated  patients of a bump-like  thickening or
swelling (induration) at the site of injection,  which the agency believes could
indicate an  inflammatory  process.  The Company  believes the clinical data for
AccuSite,  including supplementary data submitted to the agency in March 1997 as
an  amendment  to the NDA,  are  supportive  of the safety and  efficacy  of the
product in this indication.  The Company has requested a re-review by the FDA of
its NDA.  However,  the Company  does not intend to invest  substantial  Company
resources in pursuit of marketing clearance of AccuSite in the United States and
believes it is unlikely  that  AccuSite  will be cleared  for  marketing  in the
United  States.  Accordingly,  the Company has  indefinitely  suspended  further
development and commercialization programs related to AccuSite.

         The processes  required by European  regulatory  authorities before the
Company's products can be marketed in Western Europe are similar to those in the
United States.  First,  appropriate  preclinical  laboratory and animal tests as
well as analytical product quality tests must be done, followed by submission of
a clinical trial exemption or similar documentation before human clinical trials
can be  initiated.  Upon  completion  of adequate and  well-controlled  clinical
trials  in  humans  that  establish  that  the  drug  is safe  and  efficacious,
regulatory approval must be obtained from the relevant regulatory authorities.

         AccuSite has been approved in Denmark,  Germany,  Ireland,  Luxembourg,
The Netherlands, and the United Kingdom and recommended for approval in Belgium,
Finland,  and Italy.  A regulatory  decision is expected in 1998 in France.  The
Company is evaluating whether, in the absence of commercialization in the United
States,  it may be cost  effective to market  AccuSite in Europe  through  local
partners.  Commercialization  of AccuSite in Europe would,  in certain  markets,
also require the  negotiation of  satisfactory  pricing with local  governments.
There  can be no  assurance  that the  Company  will  develop  the  distribution
agreements and regulatory approvals,  including pricing approvals, that would be
necessary to commercialize AccuSite in Europe.

Uncertainties Associated with Clinical Trials

         Matrix has conducted  and plans to continue to undertake  extensive and
costly  clinical  testing to assess the safety  and  efficacy  of its  potential
products.  Failure to comply with FDA regulations applicable to clinical testing
can result in delay, suspension, or cancellation of such testing, and/or 

                                                                              13

<PAGE>

refusal by the FDA to accept the results of such testing.  In addition,  the FDA
or the Company may modify or suspend clinical trials at any time if it concludes
that the subjects or patients  participating in such trials are being exposed to
unacceptable  health  risks.  Further,  there  can be no  assurance  that  human
clinical  testing will show any current or future  product  candidate to be safe
and effective or provide data suitable for submission to the FDA.

         The Company is currently  conducting  multiple  clinical  trials in the
United States and certain  foreign  countries,  including four ongoing Phase III
trials.  The rate of completion of the  Company's  clinical  trials is dependent
upon, among other factors, the rate of patient enrollment. Patient enrollment is
a function of many factors,  including the size of the patient  population,  the
nature of the  protocol,  the  proximity  of patients to clinical  sites and the
eligibility  criteria  for the study.  The Company has  experienced  slower than
planned  accrual of patients in its ongoing Phase III trials.  Further delays in
completing  enrollment in these trials or delays in other  clinical  studies may
result in increased costs and delays, which could have a material adverse effect
on the Company. Generally, similar considerations apply to clinical testing that
is  subject  to  regulatory  oversight  by foreign  authorities  and/or  that is
intended to be used in connection with foreign marketing applications.

History of Losses; Future Profitability Uncertain

         Matrix was incorporated in 1985 and has experienced  significant losses
since that date.  As of March 31, 1998,  the Company's  accumulated  deficit was
approximately  $149,643,000.  The Company has not  generated  revenues  from its
products  or product  candidates  and  expects to incur  significant  additional
losses  over  the next  several  years.  The  Company's  ability  to  achieve  a
profitable level of operations is dependent on successfully developing products,
obtaining  regulatory  approvals for its products,  entering into agreements for
product commercialization outside the United States, and developing an effective
sales and marketing organization in the United States. No assurance can be given
that the Company's product development efforts will be completed,  that required
regulatory  approvals will be obtained,  that any products will be  manufactured
and marketed successfully, or that profitability will be achieved.

Additional Financing Requirements and Uncertain Access to Capital Markets

         The Company has expended and will continue to expend  substantial funds
to complete the research and development of its product candidates.  The Company
may require  additional  funds for these purposes through  additional  equity or
debt  financings,  collaborative  arrangements  with corporate  partners or from
other  sources.  No assurance  can be given that such  additional  funds will be
available on acceptable  terms,  if at all. If adequate  funds are not available
from operations or additional sources of financing, the Company's business could
be materially and adversely  affected.  Based on its current operating plan, the
Company  anticipates  that its existing  capital  resources  will be adequate to
satisfy its  capital  needs  through  1999.  See  "Management's  Discussion  and
Analysis of Financial Condition and Results of Operations."

Limited Manufacturing and Sales and Marketing Experience

         The  Company  intends  to  market  and  sell  certain  of  its  product
candidates,  if successfully  developed and approved,  through its own dedicated
sales force in the United States and through pharmaceutical licensees in Europe.
However,  for  AccuSite,  the  Company has  entered  into a sales and  marketing
agreement with Savage Laboratories, the U.S. marketing division of Altana, Inc.,
to sell,  market and  distribute  AccuSite to  dermatology  and  obstetrics  and
gynecology audiences in the United States. The Company has similar agreements in
place for AccuSite with pharmaceutical  companies in

                                                                              14

<PAGE>

Italy, Spain, and Portugal. The Company has announced the withdrawal of AccuSite
from the United  Kingdom,  where it has been  marketed  since  January 1997 by a
contract sales organization. In order to establish a successful direct sales and
marketing  capability in any of its targeted  markets,  the Company will need to
develop a sales force with technical  expertise.  There can be no assurance that
the Company will be able to establish a successful direct sales  organization or
co-promotion  or  distribution  arrangements.  In  addition,  there  can  be  no
assurance  that resources will be available to the Company to fund marketing and
sales expenses, many of which must be incurred before sales commence. Failure to
establish a marketing and sales  capability in the United States and/or  outside
the United States may have a material adverse effect on the Company.

         The Company's  ability to conduct clinical trials on a timely basis, to
obtain  regulatory  approvals and to  commercialize  its products will depend in
part upon its ability to manufacture  its products,  either  directly or through
third parties,  at a competitive  cost and in accordance with applicable FDA and
other regulatory  requirements,  including cGMP regulations.  The Company closed
manufacturing facilities in San Jose and Milpitas,  California in March 1998 and
transferred  manufacturing personnel to a research and manufacturing facility in
San  Diego,  California  that  was  acquired  in  1995  to  meet  the  Company's
anticipated  long-term  commercial  scale production  requirements.  The Company
expects that the San Diego  facility and contract  manufacturers  should provide
sufficient  production capacity to meet clinical  requirements.  There can be no
assurance  that the Company will be able to validate  this  facility in a timely
manner  or that this  facility  will be  adequate  for  Matrix's  cost-effective
manner.  Matrix expects to continue to use selected contract  manufacturers,  in
addition  to its own  manufacturing  capability,  for some or all of its product
components.  Failure to establish additional  manufacturing capacity on a timely
basis may have a material adverse effect on the Company.

Dependence on Sources of Supply

         Several of the materials  used in the Company's  products are available
from a limited  number of  suppliers.  These items,  including  collagen gel and
various bulk drug substances used in the Company's products, have generally been
available to Matrix and others in the  pharmaceutical  industry on  commercially
reasonable  terms.  If the Company's  manufacturing  facilities  are not able to
produce  sufficient  quantities  of collagen gel in accordance  with  applicable
regulations,  the Company would have to obtain  collagen gel from another source
and gain regulatory approval for that source. There can be no assurance that the
Company would be able to locate an alternative,  cost-effective source of supply
of collagen  gel.  Matrix has  negotiated  and intends to continue to  negotiate
supply agreements, as appropriate, for the raw materials and components utilized
in its products. Any interruption of supply could have a material adverse effect
on the Company's ability to manufacture its products,  complete clinical trials,
or commercialize  products. In addition,  the Company's ability to commercialize
its  IntraDose  Injectable  Gel product in the United States could be limited by
the issuance in 1996 of a U.S.  patent for cisplatin,  a  chemotherapeutic  drug
that is the active compound in IntraDose, if the newly-issued patent were upheld
and if IntraDose  were found to infringe  that  patent,  and if the Company were
unable to obtain a license  under  that  patent.  See  "--Uncertainty  Regarding
Patents and Proprietary Rights."

Uncertainty Regarding Patents and Proprietary Rights

         The Company's  success  depends in part on its ability to obtain patent
protection  for its  products  and to  preserve  its trade  secrets  and operate
without infringing on the proprietary rights of third parties.  No assurance can
be given that the Company's pending patent applications will be approved or that
any patents will provide  competitive  advantages for the Company's  products or
will not be  successfully

                                                                              15

<PAGE>

challenged or circumvented by its competitors.  The Company has not conducted an
exhaustive patent search and no assurance can be given that patents do not exist
or could  not be  filed  which  would  have a  material  adverse  effect  on the
Company's  ability to market its products or maintain its  competitive  position
with respect to its products.  The Company's patents may not prevent others from
developing  competitive products using related technology.  Other companies that
obtain patents  claiming  products or processes  useful to the Company may bring
infringement  actions  against  the  Company.  As a result,  the  Company may be
required to obtain  licenses from others to develop,  manufacture  or market its
products.  There can be no assurance that the Company will be able to obtain any
such  licenses on  commercially  reasonable  terms,  if at all. The Company also
relies on trade secrets and proprietary  know-how which it seeks to protect,  in
part, by confidentiality agreements with its employees,  consultants,  suppliers
and  licensees.  There can be no  assurance  that these  agreements  will not be
breached,  that the Company would have adequate remedies for any breach, or that
the Company's trade secrets will not otherwise  become known or be independently
developed by competitors.

         No  assurance  can be given that any patent  issued to, or licensed by,
the Company will provide  protection that has commercial  significance.  In this
regard,  the patent  position of  pharmaceutical  compounds and  compositions is
particularly uncertain.  Even issued patents may later be modified or revoked by
the United States Patent and Trademark Office ("PTO") in proceedings  instituted
by Matrix or others. During the prosecution of the Japanese version of the first
patent  on  the  Company's  base  technology,  the  Company  became  aware  of a
previously unknown prior art reference. This was brought to the attention of the
U.S. PTO in a reexamination  of the U.S.  patent.  The Japanese  application has
been  allowed,  and the United  States  patent  has been  reissued  with  claims
slightly modified in light of the prior art. The Company  believes,  although no
assurance can be given,  that the modified claims will not materially  adversely
affect the Company's  proprietary  protection for its products.  In addition, no
assurance can be given that the Company's patents will afford protection against
competitors with similar compounds or technologies,  that others will not obtain
patents  with  claims  similar  to those  covered  by the  Company's  patents or
applications,  or that the patents of others will not have an adverse  effect on
the ability of the Company to do business.

         In 1996, for instance, a composition-of-matter patent for the cytotoxic
drug  cisplatin  was granted in the United  States to a  pharmaceutical  company
whose use patent on cisplatin as an anti-tumor  agent expired in December  1996.
The Company, on advice of patent counsel, believes the new patent for cisplatin,
the active agent in the Company's  IntraDose  product,  may have been improperly
awarded and should be found invalid and/or  unenforceable.  However,  if the new
patent on  cisplatin  is upheld and if  IntraDose  were found to  infringe  that
patent,  there can be no  assurance  that the Company  would be able to obtain a
license to the patent on commercially  reasonable  terms, if at all, in order to
commercialize IntraDose in the United States.

         The  Company  believes  that  obtaining  foreign  patents  may be  more
difficult than obtaining domestic patents because of differences in patent laws,
and recognizes that its patent position  therefore may be stronger in the United
States than abroad.  In addition,  the protection  provided by foreign  patents,
once they are obtained, may be weaker than that provided by domestic patents.

Rapid Technological Change and Substantial Competition

         The  pharmaceutical  industry  is  subject  to  rapid  and  substantial
technological   change.   Technological   competition   in  the  industry   from
pharmaceutical and biotechnology companies, universities,  governmental entities
and others  diversifying  into the field is intense and is expected to increase.
Most of these  entities  have  significantly  greater  research and  development
capabilities, as well as substantially more marketing,  financial and managerial
resources  than the  Company,  and  represent

                                                                              16

<PAGE>

significant  competition  for the Company.  Acquisitions  of, or investments in,
competing  biotechnology  companies  by  large  pharmaceutical  companies  could
increase such competitors' financial,  marketing and other resources.  There can
be no  assurance  that  developments  by others  will not render  the  Company's
products or technologies noncompetitive or that the Company will be able to keep
pace with technological  developments.  Competitors have developed or are in the
process of developing  technologies that are, or in the future may be, the basis
for competitive products.  Some of these products may have an entirely different
approach or means of  accomplishing  similar  therapeutic  effects than products
being developed by the Company.  These competing  products may be more effective
and less  costly  than the  products  developed  by the  Company.  In  addition,
conventional  drug  therapy,  surgery  and other more  familiar  treatments  and
modalities will compete with the Company's products.

         Any product which the Company  succeeds in developing  and for which it
gains  regulatory  approval must then compete for market  acceptance  and market
share. Accordingly,  important competitive factors, in addition to completion of
clinical  testing and the receipt of regulatory  approval,  will include product
efficacy,  safety,  timing and scope of regulatory  approvals,  availability  of
supply,  marketing and sales  capability,  reimbursement  coverage,  pricing and
patent protection.

Uncertainty of Pharmaceutical Pricing; No Assurance of Adequate Reimbursement

         The future  revenues,  profitability,  and  availability of capital for
biopharmaceutical  companies  may be  affected  by  the  continuing  efforts  of
governmental  and third  party  payers to  contain or reduce the costs of health
care through various means.  For example,  in certain foreign markets pricing or
profitability of prescription  pharmaceuticals is subject to government control.
In the United States,  there have been, and the Company  expects that there will
continue to be, a number of federal and state  proposals  to  implement  similar
government   control.   While  the  Company  cannot  predict  whether  any  such
legislative  or  regulatory  proposals  will be  adopted,  the  announcement  or
adoption of such proposals could have a material adverse effect on the Company's
prospects.

         The Company's ability to commercialize  its products  successfully will
depend in part on the extent to which appropriate  reimbursement  levels for the
cost of such  products  and  related  treatment  are  obtained  from  government
authorities,  private health  insurers and other  organizations,  such as health
maintenance   organizations   ("HMOs").   Third-party  payers  are  increasingly
challenging  the prices  charged for medical  products and services.  Also,  the
trend towards managed health care in the United States and the concurrent growth
of organizations  such as HMOs,  which could control or significantly  influence
the  purchase of health  care  services  and  products,  as well as  legislative
proposals to reform health care or reduce  government  insurance  programs,  may
limit  prices the  Company  can charge for its  products.  The cost  containment
measures that health care payers and providers are instituting and the effect of
any health care reform could adversely affect the Company's  ability to sell its
products and may have a material adverse effect on the Company.

Dependence Upon Qualified and Key Personnel

         Because  of the  specialized  nature  of the  Company's  business,  the
Company's ability to maintain its competitive position depends on its ability to
attract and retain qualified  management and scientific  personnel.  Competition
for such  personnel is intense.  There can be no assurance that the Company will
be able to continue to attract or retain such persons.

                                                                              17

<PAGE>

Product Liability Exposure; Limited Insurance Coverage

         The  Company  faces an  inherent  business  risk of exposure to product
liability  claims in the  event  that the use of  products  during  research  or
commercialization results in adverse effects. While the Company will continue to
take  appropriate  precautions,  there can be no  assurance  that it will  avoid
significant product liability exposure.  The Company maintains product liability
insurance for clinical  studies.  However,  there can be no assurance  that such
coverage  will be  adequate  or that  adequate  insurance  coverage  for  future
clinical or commercial  activities will be available at all, or at an acceptable
cost, or that a product  liability claim would not materially  adversely  affect
the business or financial condition of the Company.

Hazardous Materials and Product Risks

         The Company's  research and development  involves the controlled use of
hazardous  materials,  such as  cytotoxic  drugs,  other toxic and  carcinogenic
chemicals and various radioactive compounds.  Although the Company believes that
its safety  procedures for handling and disposing of such materials  comply with
the standards  prescribed by federal,  state and local regulations,  the risk of
accidental  contamination  or injury from these  materials  cannot be completely
eliminated.  In the event of such an accident,  the Company could be held liable
for any damages that result,  and any such  liability  could be  extensive.  The
Company is also  subject to  substantial  regulation  relating  to  occupational
health and safety,  environmental  protection,  hazardous substance control, and
waste management and disposal. The failure to comply with such regulations could
subject the Company to, among other things, fines and criminal liability.

         Certain   chemotherapeutic  agents  employed  by  the  Company  in  its
aqueous-based protein systems, Anhydrous Delivery Vehicles ("ADV"), and regional
delivery technology are known to have toxic side effects, particularly when used
in traditional  methods of  administration.  Each product  incorporating  such a
chemotherapeutic  agent will  require  separate FDA approval as a new drug under
the procedures  specified above.  Bovine collagen is a significant  component of
the Company's protein matrix. Two rare autoimmune  connective tissue conditions,
polymyositis  and  dermatomyositis  ("PM/DM"),  have been  alleged to occur with
increased frequency in patients who have received cosmetic collagen  treatments.
Based  upon  the  occurrence  of these  conditions,  the FDA  requested  a major
manufacturer   of  bovine  collagen   products  for  cosmetic   applications  to
investigate the safety of such uses of its collagen.  In October 1991, an expert
panel  convened  by  the  FDA to  examine  this  issue  found  no  statistically
significant  relationships  between  injectable  collagen and the  occurrence of
autoimmune  disease,  but noted that certain  limitations  in the available data
made it difficult to establish a statistically significant association.

         In addition,  bovine sourced  materials are of some concern  because of
transmission of Bovine Spongiform Encelphalopathy ("BSE"). The Company has taken
all precautions to minimize the risk of  contamination of its collagen with BSE,
including  the  use of  United  States-sourced  cow  hides.  The  Committee  For
Proprietary  Medicinal Products  ("CPMP"),  a steering committee of the European
Medicines Evaluation Agency ("EMEA"),  has classified materials made from bovine
skin products as showing no detectable  infectivity,  indicating minimal risk of
transmission of BSE.

Volatility of Stock Price; No Dividends

         The market prices for securities of biopharmaceutical and biotechnology
companies  (including the Company) have historically been highly volatile,  and,
in addition, the market has from time to time 

                                                                              18

<PAGE>

experienced  significant price and volume fluctuations that are unrelated to the
operating performance of particular companies.  Future announcements  concerning
the Company, its competitors or other biopharmaceutical  products,  governmental
regulation,  developments in patent or other proprietary  rights,  litigation or
public  concern as to the safety of products  developed by the Company or others
and general market conditions may have a significant  effect on the market price
of the Common Stock.  The Company has not paid any cash  dividends on its Common
Stock and does not anticipate paying any dividends in the foreseeable future.

Anti-Takeover Provisions

         Certain  provisions of the Company's  Certificate of Incorporation  and
Bylaws  may have the  effect of making it more  difficult  for a third  party to
acquire,  or discouraging a third party from  attempting to acquire,  control of
the Company.  Such provisions could limit the price that certain investors might
be willing to pay in the future for shares of the Company's  Common  Stock.  The
Company's  Board of  Directors  has the  authority  to issue shares of Preferred
Stock  and  to  determine  the  price,  rights,   preferences,   privileges  and
restrictions  of  those  shares  without  any  further  vote  or  action  by the
stockholders.

         The rights of the  holders of Common  Stock will be subject to, and may
be adversely  affected by, the rights of the holders of any Preferred Stock that
may be issued in the future.  The issuance of Preferred  Stock,  while providing
desirable  flexibility  in  connection  with  possible  acquisitions  and  other
corporate  purposes,  could  have the effect of making it more  difficult  for a
third  party to  acquire  a  majority  of the  outstanding  voting  stock of the
Company.  The Company has no present  plans to issue shares of Preferred  Stock.
Certain provisions of Delaware law applicable to the Company could also delay or
make more  difficult  a merger,  tender  offer or proxy  contest  involving  the
Company,  including  Section 203 of the Delaware General  Corporation Law, which
prohibits a Delaware  corporation from engaging in any business combination with
any interested stockholder for a period of three years unless certain conditions
are met.

Year 2000 Compliance

         The Company is aware of the issues associated with the programming code
in existing computer systems as the millennium (year 2000) approaches. The "year
2000" problem is pervasive  and complex as virtually  every  computer  operation
will be affected in some way by the  rollover of the two digit year value to 00.
The issue is whether  computer  systems will properly  recognize  date sensitive
information  when  the  year  changes  to  2000.  Systems  that do not  properly
recognize such  information  could generate  erroneous data or cause a system to
fail.

         During 1997,  the Company  installed a new  accounting  system that was
confirmed by the vendor to address the year 2000 related  issues.  However,  the
Company  has not  analyzed  the  external  factors,  such as the impact on those
vendors  adversely  affected by the year 2000 issue,  and has not  assessed  the
related  potential  effect on the  Company's  business,  financial  condition or
results of  operations.  There can be no  assurance  that  computer  systems and
applications of other  companies on which the Company's  operations rely will be
converted  in a timely  fashion,  or that such  failure  to  correct  by another
company would not have a material adverse effect on the Company.

                                                                              19

<PAGE>



Item 6. Exhibits and Reports on Form 8-K

         (a)      Exhibits

                  10.55    Purchase   and  Sale   Agreement   and  Joint  Escrow
                           Instructions  by and Between  Alexandria  Real Estate
                           Equities, Inc. and Matrix Pharmaceutical,  Inc. dated
                           February 3, 1998
                  10.56    Lease by and Between  ARE-4757 Nexus Centre,  LLC and
                           Matrix Pharmaceutical, Inc. dated March 25, 1998
                  10.57    Loan and Security  Agreement by and Between  ARE-4757
                           Nexus Centre,  LLC, and Matrix  Pharmaceutical,  Inc.
                           dated March 25, 1998
                  10.58    Matrix  Pharmaceutical,  Inc. v. Chubb  Customs  Ins.
                           Co., et al. Settlement Agreement
                  27.1     Financial Data Schedule

         (b)      Reports on Form 8-K

                  There  were no Current  Reports  on Form 8-K filed  during the
                  quarter ended March 31, 1998.

                                                                              20

<PAGE>


                           MATRIX PHARMACEUTICAL, INC.


                                    SIGNATURE




Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                           MATRIX PHARMACEUTICAL, INC.





Date:    May 7, 1997               By:     /s/ James R. Glynn
     -------------------              ---------------------------------
                                           James R. Glynn
                                           Director,  Chief  Operating  Officer,
                                           Chief  Financial  Officer,  Assistant
                                           Secretary


                                           Signing  on behalf of the  registrant
                                           and  as   principal   financial   and
                                           accounting officer

                                                                              21




                           PURCHASE AND SALE AGREEMENT

                          AND JOINT ESCROW INSTRUCTIONS

                                February 3, 1998

                                 BY AND BETWEEN

                      ALEXANDRIA REAL ESTATE EQUITIES, INC.

                                      Buyer

                                       AND

                          MATRIX PHARMACEUTICALS, INC.

                                     Seller



<PAGE>


                           PURCHASE AND SALE AGREEMENT
                          AND JOINT ESCROW INSTRUCTIONS

         THIS PURCHASE AND SALE  AGREEMENT AND JOINT ESCROW  INSTRUCTIONS  (this
"Agreement")  is made and entered  into as of  February 3, 1998,  by and between
ALEXANDRIA REAL ESTATE EQUITIES,  INC., a Maryland  corporation  ("Buyer"),  and
MATRIX  PHARMACEUTICALS,  INC.,  a  Delaware  corporation  ("Seller"),  for  the
purposes  of setting  forth the  agreement  of the  parties  and of  instructing
CHICAGO  TITLE  INSURANCE  COMPANY  ("Escrow   Agent"),   with  respect  to  the
transactions contemplated by this Agreement.


                                    RECITALS

         Upon  and  subject  to the  terms  and  conditions  set  forth  in this
Agreement,  Seller  desires to sell and Buyer  desires to purchase the following
(collectively, the "Property"): (i) the fee interest in those certain parcels of
real property  located in the City of San Diego,  County of San Diego,  State of
California,  as legally  described on Exhibit "A-1" and Exhibit  "A-2"  attached
hereto,  together with all rights,  privileges and easements appurtenant thereto
or used in connection therewith,  including,  without limitation,  all minerals,
oil, gas and other hydrocarbon  substances thereon,  all development rights, air
rights,  water,  water rights and water stock relating  thereto,  all strips and
gores,  and all of Seller's  right,  title and  interest in and to any  streets,
alleys,  easements,  rights-of-way,  public ways,  or other rights  appurtenant,
adjacent or connected thereto or used in connection therewith (collectively, the
"Land");  (ii) all  buildings,  improvements,  structures  and  fixtures  now or
hereafter included or located on or in the Land (collectively, but excluding the
improvements  and fixtures  designated in Exhibit  "A-3"  attached  hereto,  the
"Improvements"),  including,  without limitation, that certain building commonly
known as 4757 Nexus Center Drive (the "Building"), and all apparatus, equipment,
appliances and other fixtures used in connection with the operation or occupancy
of the  Land  and  the  Improvements,  such  as  heating,  air  conditioning  or
mechanical  systems  and  facilities  used  to  provide  any  utility  services,
refrigeration,  ventilation,  waste  disposal or other services now or hereafter
located on or in the Land or the  Improvements,  but specifically  excluding the
improvements and fixtures designated in Exhibit "A-3" attached hereto; (iii) all
tangible  personal  property,  equipment and supplies now or hereafter  owned by
Seller and located on or about the Land or the  Improvements or attached thereto
or used in connection  with the use,  operation,  maintenance or repair thereof,
including, without limitation, the personal property designated in Exhibit "B-1"
attached hereto, but excluding the personal property designated in Exhibit "B-2"
attached hereto (collectively, but excluding the personal property designated in
said Exhibit "B-2", the "Personal  Property");  and (iv) all intangible property
(collectively,  the "Intangible  Property") now or hereafter owned by Seller and
used in connection  with the Land, the  Improvements  or the Personal  Property,

                                       1

<PAGE>


including, without limitation, the Tenant Leases and the Service Contracts (each
as  hereinafter  defined),  building  trademarks  and trade names,  transferable
business   licenses,   architectural,   site,   landscaping  or  other  permits,
applications,  approvals,  authorizations and other  entitlements,  transferable
guarantees and warranties  covering the Land and/or  Improvements,  all contract
rights,  books,  records,  reports,  test  results,  environmental  assessments,
as-built  plans,  specifications  and  other  similar  documents  and  materials
relating to the use or operation,  maintenance  or repair of the Property or the
construction or fabrication thereof, and all transferable utility contracts, but
specifically  excluding  any  intangible  property  exclusively  related  to the
operation of Seller's business.


                                    AGREEMENT

         In consideration  of the mutual  covenants  contained in this Agreement
and for other good and valuable  consideration,  the receipt and  sufficiency of
which are hereby  acknowledged,  Buyer and Seller  hereby  agree,  and  instruct
Escrow Agent, as follows:

1.    AGREEMENT TO PURCHASE AND SELL.

         Subject to all of the terms and  conditions of this  Agreement,  Seller
agrees to sell,  transfer  and convey to Buyer,  and Buyer agrees to acquire and
purchase from Seller,  the  Property,  upon the terms and  conditions  set forth
herein.

2.    PURCHASE PRICE.

         The purchase price for the Property (the "Purchase Price") shall be the
sum of Eighteen Million Six Hundred Thousand Dollars  ($18,600,000),  payable as
follows:

         2.1 Deposit.  Within five (5) Business  Days (as  hereinafter  defined)
following  the date (the  "Execution  Date") which is the later of the dates set
forth next to Buyer's and Seller's  signatures  to this  Agreement,  Buyer shall
deposit  into Escrow (as  hereinafter  defined)  the sum of Five  Hundred  Fifty
Thousand Dollars  ($550,000)  (which amount,  together with any and all interest
and dividends earned thereon, shall hereinafter be referred to as the "Deposit")
by wire transfer,  or by certified or bank check, payable to the order of Escrow
Agent.

         Escrow Agent shall invest the Deposit in insured money market accounts,
certificates of deposit,  United States Treasury Bills or such other instruments
as Buyer may instruct from time to time. In the event of the consummation of the
purchase and sale of the Property as contemplated  hereunder,  the Deposit shall
be paid to Seller at the Closing  (as  defined in Section 6 below) and  credited
against  the  Purchase

                                       2

<PAGE>


Price. In the event the sale of the Property is not  consummated  because of the
termination  of this  Agreement  by Buyer  in  accordance  with any  right to so
terminate  provided herein, or the failure of any condition except for a default
of Buyer under this  Agreement  caused  solely by Buyer,  the  Deposit  shall be
returned to Buyer.

         2.2 Balance. On the Closing Date (as defined in Section 6 below), Buyer
shall pay to Seller the balance of the Purchase Price over and above the Deposit
paid by Buyer under  Section  2.1 above,  by wire  transfer of federal  funds to
Escrow Agent, net of all prorations and adjustments as provided herein.

         2.3  Allocation  of  Purchase  Price.  Subject  to the  prorations  and
adjustments  hereinafter  provided,  the Purchase Price shall be allocated among
the Land parcels, the Improvements, the Personal Property and the other Property
as Buyer and Seller shall mutually  determine in good faith using, to the extent
required,  the method set forth in section 1060 of the Internal  Revenue Code of
1986 (as  amended)  and the  Treasury  Regulations  promulgated  thereunder  for
purposes  of filing  Form  8594 with the  Internal  Revenue  Service;  provided,
however,  that the parties agree  that$16,000,000 shall be allocated to the Land
parcel  described on Exhibit A-1 attached  hereto and the other  portions of the
Property  located  thereon or  associated  therewith,  and  $2,600,000  shall be
allocated to the Land parcel  described  on Exhibit A-2 attached  hereto and the
other  portions  of  the  Property  located  thereon  or  associated  therewith.
Notwithstanding  such allocation of the Purchase Price, the sale of the Property
shall be on an all or nothing  basis,  the sale of each item of  Property  to be
conditioned  upon the  simultaneous  sale of all other  items of  Property  on a
concurrent  basis,  and Buyer shall have no right to purchase,  and Seller shall
have no right to cause Buyer to  purchase,  less than all of the  Property as an
entirety in accordance  with the  provisions of this  Agreement.  Both Buyer and
Seller  agree  that  in all  public  filings  and  reports,  including,  without
limitation,  any documentary or other transfer tax declarations and any federal,
state, or local income,  sales, or use tax returns or declarations,  the various
items of Property shall be valued as determined by Buyer.

3.    OPENING OF ESCROW.

         Promptly  following the Execution Date,  Buyer and Seller shall cause a
purchase and sale escrow  ("Escrow")  to be opened with Escrow Agent by delivery
to Escrow Agent of a fully  executed  copy of this  Agreement  (the  "Opening of
Escrow").  This Agreement  shall  constitute  escrow  instructions to the Escrow
Agent as well as the agreement of the parties.  Escrow Agent is hereby appointed
and designated to act as the Escrow Agent and instructed to deliver, pursuant to
the terms of this Agreement, the documents and funds to be deposited into Escrow
as herein  provided.  The parties  hereto shall execute such  additional  escrow
instructions,  not inconsistent with this Agreement as determined by counsel for
Buyer and  Seller,  as Escrow  Agent  shall deem  reasonably  necessary  for its
protection,  including  Escrow  Agent's  general  provisions,  if

                                       3

<PAGE>


any (as may be modified by Buyer,  Seller and Escrow Agent). In the event of any
inconsistency  between this Agreement and such additional  escrow  instructions,
the provisions of this Agreement shall govern.

4.    ACTIONS PENDING CLOSING.

         4.1 Due Diligence Period.

                  4.1.1 Due Diligence.

                           4.1.1.1 Property Documents.  Within five (5) Business
Days after the Execution  Date,  Seller shall deliver or make available to Buyer
copies of all contracts,  documents,  leases,  reports, books, records and other
materials  relating to the Property,  including,  without  limitation,  as-built
plans and specifications, operating statements, income and expense records, rent
rolls, engineering tests, soil tests, a Phase One  environmental/asbestos  audit
of the  Property,  a Phase  Two  environmental  audit of the  Property,  service
contracts,   structural  and  mechanical  reports,   maps,  plans,   agreements,
governmental  permits  and  approvals,   appraisals,  title  policies,  surveys,
construction   warranties,   and  land  studies  (collectively,   the  "Property
Documents") to the extent in Seller's possession or control or in the possession
of its agents,  auditors or independent  contractors,  all at Seller's sole cost
and expense.

                           4.1.1.2 Diligence Tests. At all reasonable times from
the Execution Date until the Closing or earlier  termination of this  Agreement,
Buyer, its agents and representatives shall be entitled at Buyer's sole cost and
expense to (i) enter onto the Property  during  normal  business  hours and upon
reasonable advance notice to Seller, to perform any inspections, investigations,
studies and tests of the  Property,  including,  without  limitation,  physical,
structural,  mechanical,  architectural,  engineering,  soils,  geotechnical and
environmental/asbestos  tests that Buyer deems reasonable;  (ii) upon reasonable
notice to  Seller,  cause an  environmental  assessment  of the  Property  to be
performed;  and (iii) review all Property  Documents  and Seller  Documents  and
examine  and copy any and all  books  and  records  maintained  by Seller or its
agents relating to the Property  (including,  without limitation,  all documents
relating to utilities,  zoning, and the access, subdivision and appraisal of the
Property).

                           4.1.1.3  Tenants.  Within  ten (10)  days  after  the
Execution Date,  Seller shall arrange for an introduction of Buyer to any tenant
of the Property and shall otherwise assist and cooperate with Buyer in providing
Buyer access to such tenants,  subject to Seller's  rights under any leases with
such  tenants.  Buyer and its agents,  assigns and  employees  shall observe and
comply  with all  reasonable  requests  on the part of tenants  at the  Property
regarding  entry into tenant  facilities  for purpose of  inspection.  Buyer may
conduct such inquiries and investigations of any and all tenants (or prospective
tenants) as Buyer, in its sole discretion, deems advisable or necessary.

                                       4

<PAGE>


                           4.1.1.4  Insurance.  Buyer agrees that during the Due
Diligence Period (as hereinafter  defined) it shall carry, or cause its agent to
carry,  workers'  compensation and general liability  insurance in the amount of
$1,000,000 per  occurrence,  which  insurance shall name Seller as an additional
insured,  and shall  otherwise be issued by carriers  and be in form  reasonably
satisfactory to Seller.  Buyer shall provide Seller with proof of such insurance
prior to commencing Buyer's physical inspections of the Property.

                           4.1.1.5   Indemnity  and  Repair.   Buyer  agrees  to
indemnify,  defend  (with  counsel  reasonably  acceptable  to Seller)  and hold
harmless Seller from any losses  resulting from any final judgment by a court of
competent  jurisdiction  arising  from any actual  damage to the Property or any
injury to  persons  caused  by any act of Buyer as a result of the  inspections,
investigations or tests performed by Buyer, its agents or representatives or any
entry by Buyer or its agents or  representatives  onto the Property  pursuant to
this Section  4.1.1,  which  indemnity  shall  survive the  termination  of this
Agreement or the Closing and delivery of the Deed (as hereinafter defined) for a
period of ninety (90) days; provided,  however, that Buyer's indemnity hereunder
shall not include any losses,  cost,  damage or expenses  resulting from (x) the
acts of  Seller,  its agents or  representatives,  or (y) the  discovery  of any
pre-existing  condition  of the  Property.  In  addition,  if this  Agreement is
terminated, Buyer shall repair any material damage to the Property caused by its
entry thereon and shall restore the Property  substantially  to the condition in
which it existed prior to such entry;  provided,  however, that Buyer shall have
no  obligation  to repair any damage  caused by Seller's  negligence  or willful
misconduct  or  to  remediate,   contain,  abate  or  control  any  Material  of
Environmental  Concern (as  hereinafter  defined) or any  hazardous  defect that
existed at the Property prior to Buyer's entry thereon.

                  4.1.2  Termination  Right.  Buyer  shall have the right at any
time during the period (the "Due Diligence Period") beginning upon the Execution
Date and ending on the date which is thirty (30)  calendar  days  following  the
Execution  Date  (the  "Due  Diligence  Termination  Date")  to  terminate  this
Agreement if, during the course of Buyer's due diligence  investigations  of the
Property, Buyer determines in its sole and absolute discretion that the Property
is not  acceptable  to  Buyer.  Buyer may  exercise  such  termination  right by
delivering written notice of termination to Seller and Escrow Agent on or before
the Due Diligence  Termination  Date.  Upon such  termination,  (i) Escrow Agent
shall  return the Deposit to Buyer,  (ii) the parties  shall  equally  share the
cancellation charges of Escrow Agent and Title Company (as hereinafter defined),
and (iii) this  Agreement  shall  automatically  terminate  and be of no further
force or effect and neither party shall have any further  rights or  obligations
hereunder,  other than pursuant to any provision hereof which expressly survives
the termination of this Agreement.  Upon the written request of Seller following
such  termination,  Buyer shall return to Seller all of the  Property  Documents
provided to Buyer and,  provided  that no dispute  between Buyer and Seller then
exists, deliver to Seller copies of all non-

                                       5

<PAGE>


confidential,  non-privileged  reports  prepared  by third  parties for Buyer in
connection with its  investigations of the Property.  If Buyer does not exercise
such  termination in writing prior to the Due Diligence  Termination  Date, then
Buyer's right to terminate this  Agreement  pursuant to this Section 4.1.2 shall
automatically lapse.

         4.2 Title.

                  4.2.1 Deliveries. Buyer has obtained an ALTA extended coverage
preliminary  title report (the "PTR") issued by Chicago Title Insurance  Company
(in such  capacity,  "Title  Company"),  together  with  legible  copies  of all
documents  referenced  as  exceptions  therein.  Not later than twenty (20) days
after the Execution Date, Seller shall deliver or cause to be delivered to Buyer
(a) a current or currently  updated  As-Built  American  Land Title  Association
survey of the Property (the "Survey"),  in form reasonably satisfactory to Buyer
and Title  Company,  prepared by a surveyor  reasonably  acceptable to Buyer and
licensed  in  the  State  of  California  and  certified   (using  a  surveyor's
certificate in substantially the same form as the certificate attached hereto as
Exhibit  "C") to Buyer,  Title  Company,  and such other  persons or entities as
Buyer may,  in its  discretion,  request,  which  Survey  shall show any and all
matters which Buyer may reasonably require,  including,  without limitation, all
Improvements,  all easements,  all roads,  all utilities,  the number of parking
spaces,  access to and from the Land,  and  drainage  ditches,  set-back  lines,
protrusions,  encroachments,  and encumbrances affecting the same; and (b) a UCC
Search with regard to the Personal Property (the "UCC Search").

                  4.2.2 Buyer's Review of Title.  Buyer shall have until the Due
Diligence  Termination  Date to notify Seller in writing of any objection  which
Buyer  may have to any  exception  reported  in the PTR or  matter  shown on the
Survey or the UCC Search (or any updates thereof; provided, however, that if any
such  updates are  received by Buyer,  Buyer shall have an  additional  five (5)
Business  Days,  regardless of the Due  Diligence  Termination  Date,  following
Buyer's  receipt of such update and legible  copies of all documents  referenced
therein  to notify  Seller of  objections  to items  shown on any such  update).
Exceptions reported in the PTR and matters shown on the Survey or the UCC Search
(or any updates  thereof)  not  objected to by Buyer as provided  above shall be
deemed to be  "Permitted  Exceptions."  As a condition to Closing,  Seller shall
take all action  necessary to remove from title to the  Property any  exceptions
and matters so objected to by Buyer, or in the alternative,  Seller shall obtain
for Buyer  title  insurance  insuring  over such  exceptions  or  matters,  such
insurance to be in form and substance  satisfactory  to Buyer.  If, prior to the
Closing, Seller is unable to remove or satisfactorily insure over any exceptions
or matters  objected to by Buyer and Buyer is  unwilling  to take title  subject
thereto,  then, in addition to any and all other rights and remedies which Buyer
may have  hereunder,  Buyer may terminate  this  Agreement (in which case Escrow
Agent shall return the Deposit to Buyer,  the parties  shall  equally  share the
cancellation  charges of Escrow Agent and Title Company, and

                                       6

<PAGE>


neither  party  shall  thereafter  have any rights or  obligations  to the other
hereunder);  provided,  however,  that if such objected to exceptions or matters
are not removed by the Closing Date, Buyer may elect,  upon written notice on or
prior to such date,  to (a) extend the Closing Date to allow Seller a reasonable
period of time to remove such  objected to  exceptions or matters or (b) proceed
to a timely  Closing  whereupon  such objected to exceptions or matters shall be
deemed Permitted Exceptions.  Seller shall in any event be required to discharge
and remove  any and all liens and  encumbrances  affecting  the  Property  which
secure an obligation to pay money (other than  installments of real estate taxes
and  assessments  not  delinquent as of the Closing) and, even though Buyer does
not expressly  disapprove such liens,  such liens and encumbrances  shall not be
Permitted Exceptions.

                  4.2.3 Condition of Title at Closing. Upon the Closing,  Seller
shall sell,  transfer and convey to Buyer  indefeasible  fee simple title to the
Land and the Improvements thereon by a duly executed and acknowledged grant deed
in the form of Exhibit "D"  attached  hereto (the  "Deed"),  subject only to the
Permitted  Exceptions.  Prior to  Closing,  Seller  shall not take any action or
commit or suffer any acts which  would give rise to a variance  from the current
legal  description  of the  Land,  or cause the  creation  of any  exception  or
encumbrance  against or respecting the Land without the prior written consent of
Buyer, which consent Buyer may withhold in its sole discretion.  Nothing in this
Section 4.2.3 shall preclude Buyer from disapproving title matters in accordance
with the provisions of Section 4.2.2 above.

                  4.2.4 Within ten (10) days of the Execution Date, Seller shall
deliver to Buyer property  questionnaires in the form attached hereto as Exhibit
"E" (the "Property  Questionnaires")completed  to the reasonable satisfaction of
Buyer.

5.    CONDITIONS PRECEDENT TO CLOSING.

         5.1 Buyer's  Conditions.  The obligation of Buyer to render performance
under this  Agreement  is subject to the  following  conditions  precedent  (and
conditions  concurrent,  with respect to deliveries to be made by the parties at
Closing) ("Buyer's Conditions"), which conditions may be waived, or the time for
satisfaction  thereof  extended,  by Buyer only in a writing  executed  by Buyer
(provided,  however,  that any such waiver shall not affect  Buyer's  ability to
pursue any remedy it may have with respect to any breach hereunder by Seller):

                  5.1.1 Title.  Title Company shall be prepared and  irrevocably
committed to issue to Buyer an American Land Title Association extended coverage
owner's  policy of title  insurance in favor of Buyer in an amount not less than
the Purchase Price showing  indefeasible fee simple title to the Property vested
in Buyer, with those endorsements reasonably requested by Buyer, subject only to
the Permitted Exceptions (collectively, the "Owner's Title Policy").

                                       7

<PAGE>


                  5.1.2 Seller's Due Performance. All of the representations and
warranties  of  Seller  set forth  herein  shall be true and  correct  as of the
Closing Date, and Seller,  on or prior to the Closing Date,  shall have complied
with and/or performed all of the obligations,  covenants and agreements required
on the part of Seller to be complied with or performed  pursuant to the terms of
this Agreement. On the Closing Date, Seller shall deliver a certificate,  in the
form of Exhibit "F"  attached  hereto  (the  "Seller's  Certificate"),  to Buyer
certifying  that (i) all of the  representations,  covenants  and  warranties of
Seller made in or pursuant to this  Agreement  are true,  accurate,  correct and
complete as of the Closing,  (ii) all  conditions to the Closing that Seller was
to  satisfy  or  perform  have  been  satisfied  and  performed,  and  (iii) all
conditions  to the Closing  that Buyer was to perform  have been  satisfied  and
performed.

                  5.1.3   Physical   Condition  of  Property.   Subject  to  the
provisions of Section 10 below, the physical  condition of the Property shall be
substantially  the same on the Closing Date as on the Execution Date, except for
reasonable  wear  and tear and any  damages  due to any act of Buyer or  Buyer's
representatives.

                  5.1.4  Bankruptcy.  No action or  proceeding  shall  have been
commenced by or against  Seller under the federal  bankruptcy  code or any state
law for the relief of debtors or for the  enforcement of the rights of creditors
and no attachment, execution, lien or levy shall have attached to or been issued
with respect to the Property or any portion thereof.

                  5.1.5 Tenant Leases.  At the Closing,  Seller shall assign all
of Seller's  rights and remedies under the Tenant Leases which Buyer has elected
in writing prior to the Closing to assume (collectively,  the "Assumed Leases"),
including,  without  limitation,  the right to any security deposits and prepaid
rent under the Assumed Leases, to Buyer pursuant to an assignment and assumption
of leases and  security  deposits  (the  "Assignment  of Leases") in the form of
Exhibit "G" attached hereto, and Seller shall retain,  pursuant to the Lease (as
hereinafter defined),  all of the rights and obligations of the lessor under all
Tenant Leases other than the Assumed  Leases (such Tenant Leases being  referred
to herein as the "Retained Leases");  provided,  however, that the parties agree
that that certain  Industrial  Multi-Tenant Lease between Seller, as "Landlord,"
and Advanced Tissue  Sciences,  Inc., as "Tenant," dated July 15, 1996, and that
certain  Building Lease  Agreement,  dated August 9, 1996,  between  Seller,  as
"Lessor," and Cox California  PCS, Inc., as "Lessee," for rooftop  communication
facilities,  shall remain and constitute Retained Leases and Buyer shall have no
right to elect to assume the same.

                  5.1.6 Bill of Sale.  At the Closing,  Seller shall  deliver to
Buyer a bill of sale and  assignment  (the  "Bill of Sale and  Assignment"),  by
which  Seller  shall  transfer  to  Buyer  all  the  Personal  Property  and the
Intangible Property,  including, without limitation, the Property Documents, but
excluding the Tenant Leases and any

                                       8

<PAGE>


Service Contracts which Buyer has elected in writing prior to the Closing not to
assume, in each case free of all liens and encumbrances,  in the form of Exhibit
"H" attached hereto.

                  5.1.7  Estoppel  Certificates.  Seller shall use  commercially
reasonable efforts to deliver to Buyer,  within fifteen (15) Business Days after
the Execution Date,  estoppel  certificates,  each  substantially in the form of
Exhibit "I" attached  hereto,  executed by each tenant  under the Tenant  Leases
(collectively,  the  "Estoppel  Certificates"),  and as a condition  to Closing,
Seller shall deliver Estoppel Certificates from each tenant on or before the Due
Diligence  Termination Date. Within the Due Diligence Period (or within five (5)
days after delivery with respect to each Estoppel Certificate which is delivered
after the  expiration  of the Due  Diligence  Period),  Buyer  shall  review and
approve or disapprove the Estoppel  Certificates,  in their sole discretion.  In
addition,  not more than five (5) days prior to the Closing  Date,  Seller shall
deliver to Buyer an update for each of the  Estoppel  Certificates  executed  by
each tenant under the Tenant  Leases  (collectively,  the  "Estoppel  Updates"),
which  Estoppel  Updates shall reflect that there have been no material  adverse
changes  since  the date of the  Estoppel  Certificate  and that any of  Buyer's
objections to the Estoppel  Certificates have been corrected or cured to Buyer's
satisfaction. Buyer shall review and approve or disapprove the Estoppel Updates,
in its sole discretion, prior to the Closing Date.

                  5.1.8  Nonforeign  Affidavits.  At the  Closing,  Seller shall
deliver to Buyer (i) the Nonforeign  Affidavit (the  "Nonforeign  Affidavit") in
the form of Exhibit "J-1" attached hereto, and (ii) the California Form 590 (the
"Form 590") attached hereto as Exhibit "J-2", each executed by Seller.

                  5.1.9  Property  Questionnaires.  Buyer  shall  have  received
Property   Questionnaires   for  the  Property,   completed  to  the  reasonable
satisfaction  of Buyer,  and no such Property  Questionnaire  shall indicate any
fact or circumstance that Buyer reasonably believes (based on advice of counsel)
would be likely to result in Buyer losing its status as a real estate investment
trust, as defined in Section 856 of the Internal  Revenue Code (as amended),  if
the transactions contemplated hereby are consummated.

                  5.1.10 New Lease.  At the Closing,  Seller  shall  execute and
deliver  to  Buyer a Lease  (the  "Lease"),  in the  form of  Exhibit  "K" to be
attached  hereto,  covering the entire  Property,  which Lease shall include the
terms set forth in Exhibit "K-1" attached  hereto.  Notwithstanding  anything to
the  contrary  set forth  herein,  in the event  that  Seller and Buyer have not
agreed upon the form of Exhibit "K" before the Due Diligence  Termination  Date,
unless  Buyer and  Seller  otherwise  agree in  writing,  this  Agreement  shall
thereupon  terminate  and be of no further  force or effect,  Escrow Agent shall
return the Deposit to Buyer,  Buyer  shall pay the charges of Title  Company and
Escrow  Agent,  and neither  party shall have any further  obligation  hereunder
except

                                       9

<PAGE>


for those obligations which by their terms survive the termination hereof.

                  5.1.11 Loan  Agreement.  At the Closing,  Seller shall execute
and deliver to Buyer a Promissory  Note, a Loan and Security  Agreement and such
other instruments and agreements  (including,  without  limitation,  UCC-1's) as
Buyer may reasonably require (collectively,  the "Loan Documents"),  all in form
and substance  satisfactory to Buyer in its  discretion,  in connection with the
contemplated  loan from Buyer to Seller (the  "Loan"),  the  principal  terms of
which are set forth on Exhibit "L" attached hereto.  Notwithstanding anything to
the  contrary  set forth  herein,  in the event  that  Seller and Buyer have not
agreed upon the form of the Loan Documents before the Due Diligence  Termination
Date,  unless Buyer and Seller otherwise agree in writing,  this Agreement shall
thereupon  terminate  and be of no further  force or effect,  Escrow Agent shall
return the Deposit to Buyer,  Buyer  shall pay the charges of Title  Company and
Escrow  Agent,  and neither  party shall have any further  obligation  hereunder
except  for those  obligations  which by their  terms  survive  the  termination
hereof.

                  5.1.12  Cooperation.  Seller shall  promptly  deliver to Buyer
copies  of  such  10-K's,  10-Q's,  8-K's,  proxy  statements,  annual  reports,
contracts, documents and other materials as may be reasonably requested by Buyer
pertaining to the financial  condition of Seller,  including the latest  monthly
and year-to-date financial statement, and a copy of Seller's Business Plan.

                  5.1.13  No  Moratoria.  No  moratorium,  statute,  regulation,
ordinance, or federal,  state, county or local legislation,  or order, judgment,
ruling or  decree of any  governmental  agency or of any court  shall  have been
enacted,  adopted,  issued,  entered or pending  which  would  adversely  affect
Buyer's intended use of the Property.

                  5.1.14 Parking License. At the Closing, Seller and Buyer shall
execute and deliver a Parking License Agreement (the "Parking  License") in form
and  substance  mutually  acceptable  to Buyer and Seller,  granting  the lessee
pursuant to the Lease a right to use such parking  spaces located on the portion
of the Land described in Exhibit "A-2" attached hereto which, when combined with
the number of spaces available pursuant to the Lease entitles such lessee to use
not less than 201 parking spaces.

         5.2 Failure of Buyer's  Conditions.  Subject and without  limitation to
Buyer's rights hereunder, including, without limitation, Section 11.2 hereof, if
any of the Buyer's Conditions have not been fulfilled within the applicable time
periods, Buyer may:

                  5.2.1 Waive and Close.  Waive the Buyer's  Condition and close
Escrow  in  accordance  with  this  Agreement,  with or  without  adjustment  or
abatement of

                                       10

<PAGE>


the Purchase Price; or

                  5.2.2  Close.  Close  escrow  without  waiving  or curing  the
failure of the Buyer's  Condition  but without  waiving any other  rights  which
Buyer may have against Seller, which rights are expressly reserved hereby; or

                  5.2.3 Terminate. Terminate this Agreement by written notice to
Seller and to Escrow Agent, in which event Escrow Agent shall return the Deposit
to Buyer, Seller shall pay the cancellation  charges of Title Company and Escrow
Agent, and Buyer shall be entitled to pursue any other rights and remedies which
it may have against Seller in connection herewith.

         5.3 Seller's Conditions. The obligation of Seller to render performance
under this  Agreement  is subject to the  following  conditions  precedent  (and
conditions  concurrent  with respect to  deliveries to be made by the parties at
Closing)  ("Seller's  Conditions"),  which conditions may be waived, or the time
for  satisfaction  thereof  extended,  by Seller  only in a writing  executed by
Seller  (provided,  however,  that any such  waiver  shall not  affect  Seller's
ability to pursue any remedy it may have with respect to any breach hereunder by
Buyer):

                  5.3.1 Buyer's Due Performance.  All of the representations and
warranties  of Buyer set forth in Section 8 hereof  shall be true and correct as
of the Closing  Date,  and Buyer,  on or prior to the Closing  Date,  shall have
complied with and/or performed all of the obligations,  covenants and agreements
required on the part of Buyer to be complied  with or performed  pursuant to the
terms of this Agreement; and

                  5.3.2 Loan.  At the Closing,  Buyer shall  deposit with Escrow
Agent the proceeds of the Loan, and shall instruct Escrow Agent to disburse such
proceeds to Seller as Seller may direct immediately following the Closing.

                  5.3.3  Bankruptcy.  No action or  proceeding  shall  have been
commenced by or against Buyer under the federal bankruptcy code or any state law
for the relief of debtors or for the enforcement of the rights of creditors.

         5.4 Failure of Seller's  Conditions.  Subject to Seller's  rights under
Section  11.1  hereof in the event of a default  by Buyer  which  results in the
failure  of a  Seller's  Condition,  in the event of the  failure  of a Seller's
Condition,  Seller may terminate this Agreement by delivery of written notice to
Buyer and Escrow Agent,  in which event Escrow Agent shall return the Deposit to
Buyer, the parties shall equally share the cancellation charges of Title Company
and  Escrow  Agent,  and  neither  party  shall  thereafter  have any  rights or
obligations to the other hereunder.

6.    CLOSING.

                                       11

<PAGE>


         6.1 Closing  Date.  Subject to the  provisions of this  Agreement,  the
Closing  shall  take  place on the  fifth  (5th)  day  after  the Due  Diligence
Termination Date, or on such other date as the parties hereto may agree. As used
herein,  the "Closing"  shall mean the  recordation  of the Deed in the Official
Records  of  the  County  of San  Diego,  State  of  California  (the  "Official
Records"),  and the  "Closing  Date"  shall mean the date upon which the Closing
actually occurs.

         6.2 Deliveries by Seller.  Not less than two (2) Business Days prior to
the Closing Date,  Seller, at its sole cost and expense,  shall deliver or cause
to be delivered into Escrow the following documents and instruments,  each dated
as of the Closing  Date and  executed by Seller,  in addition to the other items
and payments required by this Agreement to be delivered by Seller:

                  6.2.1  Deed.  The  original  executed  and  acknowledged  Deed
conveying the Property to Buyer or its nominee;

                  6.2.2   Nonforeign   Affidavit.   Two  (2)  originals  of  the
Nonforeign Affidavit, each executed by Seller;

                  6.2.3 Form 590. Two (2)  duplicate  originals of the Form 590,
each executed by Seller;

                  6.2.4 Lease and Parking License. Four (4) originals of (i) the
Lease,  (ii) a Memorandum  of Lease in  recordable  form,  and (iii) the Parking
License, each executed by Seller;

                  6.2.5 Assignment of Leases. Four (4) original  counterparts of
the Assignment of Leases, each executed by Seller;

                  6.2.6 Loan Documents.  Four (4) original  counterparts of each
of the Loan Documents, each executed by Seller;

                  6.2.7  Bill  of  Sale  and   Assignment.   Four  (4)  original
counterparts of the Bill of Sale and Assignment, each executed by Seller;

                  6.2.8  Seller's   Certificate.   Four  (4)  original  Seller's
Certificates, each executed by Seller;

                  6.2.9  Tenant  Leases.  An original (or  certified  copy if an
original is not  available),  fully executed  counterpart of each of the Assumed
Leases and any amendments, modifications,  supplements and restatements thereto,
and a  certified  copy of  each  of the  Retained  Leases  and  any  amendments,
modifications, supplements and restatements thereto;

                                       12

<PAGE>


                  6.2.10 Proof of  Authority.  Such proof of Seller's  authority
and authorization to enter into this Agreement and the transaction  contemplated
hereby, and such proof of the power and authority of the individual(s) executing
or delivering any instruments,  documents or certificates on behalf of Seller to
act for and bind Seller as may be reasonably required by Title Company or Buyer;
and

                  6.2.11 Other. Such other documents and instruments, signed and
properly  acknowledged by Seller, if appropriate,  as may be reasonably required
by Buyer,  Escrow Agent or otherwise in order to  effectuate  the  provisions of
this  Agreement  and  the  Closing  of  the  transactions  contemplated  herein,
including,  without  limitation,  reasonable or customary  title  affidavits and
indemnities.

         6.3 Deliveries by Buyer.  On or before the Closing,  Buyer, at its sole
cost and  expense,  shall  deliver  or cause to be  delivered  into  Escrow  the
following:  (i) the balance of the Purchase  Price  pursuant to Section 2 hereof
and Buyer's share of prorations and "Closing Costs" (as hereinafter defined), as
provided in Sections 6.5 and 6.6, respectively;  (ii) four (4) original executed
counterparts  of the  Assignment  of Leases;  (iii) four (4)  original  executed
counterparts of the Lease,  the Memorandum of Lease, the Parking License and the
Loan Documents to which Buyer is a party;  (iv) such proof of Buyer's  authority
and authorization to enter into this Agreement and the transaction  contemplated
hereby, and such proof of the power and authority of the individual(s) executing
or delivering any  instruments,  documents or certificates on behalf of Buyer to
act for and bind Buyer as may be reasonably required by Title Company or Seller;
and (v) such other documents and instruments,  signed and properly  acknowledged
by Buyer,  if  appropriate,  as may  reasonably  be required by Escrow  Agent or
otherwise  in order to  effectuate  the  provisions  of this  Agreement  and the
closing of the transactions contemplated herein.

         6.4 Actions by Escrow Agent.  Provided that Escrow Agent shall not have
received  written notice from Buyer or Seller of the failure of any condition to
the Closing or of the termination of the Escrow and this  Agreement,  when Buyer
and Seller have  deposited  into Escrow the documents and funds required by this
Agreement,  and Title Company is irrevocably  and  unconditionally  committed to
issue the Owner's  Title  Policy  concurrently  with the  Closing,  Escrow Agent
shall,  in the order and  manner  herein  below  indicated,  take the  following
actions:

                  6.4.1   Recording  and  Filing.   Following   Title  Company's
acknowledgment  that it is  prepared  and  irrevocably  committed  to issue  the
Owner's  Title  Policy  to Buyer,  first  cause the  Deed,  and  thereafter  the
Memorandum  of Lease  and any  other  documents  which the  parties  hereto  may
mutually  direct,  to be recorded in the Official  Records,  and file such other
documents or instruments with the appropriate  filing offices as the parties may
mutually  direct,  and obtain conformed copies

                                       13

<PAGE>


thereof for distribution to Buyer and Seller.

                  6.4.2 Lease and Promissory  Note.  Date as of the Closing Date
(i) each  counterpart of the Lease,  and (ii) the original  Promissory Note with
respect to the Loan, and deliver one fully-executed and dated counterpart of the
Lease and the original executed and dated Promissory Note to Buyer.

                  6.4.3 Funds.  Upon receipt of  confirmation of the recordation
of the Deed and such other  documents  as were  recorded  or filed  pursuant  to
Section 6.4.1 above, disburse all funds deposited with it by Buyer as follows:

                  (a)  Pursuant  to  the  "Closing  Statement"  (as  hereinafter
defined),  retain for Escrow  Agent's  own  account  all escrow  fees and costs,
disburse to Title Company the fees and expenses  incurred in connection with the
issuance of the  Owner's  Title  Policy,  and  disburse to any other  persons or
entities entitled thereto the amount of any other Closing Costs;

                  (b) Disburse to Seller an amount equal to the Purchase  Price,
less or plus the net debit or credit to Seller by reason of the  prorations  and
allocation of Closing Costs provided for in this Section 6. Seller's portion (as
provided in Section 6.6 below) of the escrow fees,  title fees and other Closing
Costs shall be paid pursuant to clause (a) above;

                  (c)  Disburse to Seller an amount equal to the proceeds of the
Loan, less any costs to file or record any of the Loan Documents, which shall be
paid by Seller;

                  (d) Disburse to Buyer any remaining funds in the possession of
Escrow  Agent  after  payments  pursuant  to (a),  (b) and (c)  above  have been
completed.

                  6.4.4 Owner's  Title Policy.  Cause Title Company to issue the
Owner's Title Policy to Buyer.

                  6.4.5 Delivery of Documents.  Deliver to Buyer and Seller each
one original of all documents,  other than the Deed and the Promissory Note with
respect to the Loan, deposited into Escrow.

         6.5 Prorations.  Rentals,  revenues, and other income, if any, from the
Property  (other than income in  connection  with the Retained  Leases),  taxes,
assessments,  improvement bonds,  service or other contract fees, utility costs,
and other expenses  affecting the Property  shall be prorated  between Buyer and
Seller as of the Closing Date.  For purposes of  calculating  prorations,  Buyer
shall be deemed to be in title to the Property,  and  therefore  entitled to the
income  (other  than  income  in  connec-

                                       14

<PAGE>


tion with the Retained  Leases) and  responsible  for the expenses,  after 12:01
a.m. on the Closing  Date.  Delinquent  rentals in  connection  with the Assumed
Leases as of the Closing Date shall not be prorated,  but when paid shall be the
sole property of Buyer and Seller hereby irrevocably  assigns, as of the Closing
Date,  its entire right,  title and interest in and to such  delinquent  rentals
(including  the right to collect to same) to Buyer.  On the Closing Date,  Buyer
shall be fully credited for (i) security  deposits which were paid by tenants to
Seller  under or in  connection  with the  Assumed  Leases,  (ii)  reimbursement
expenses  and other sums owed by Seller to tenants  for work or  disputes  which
occurred  prior to the Closing Date or for work to be performed or allowances to
be granted to any tenants upon or after the Closing Date pursuant to any Assumed
Leases in existence as of the Closing Date,  (iii) any  commissions or brokerage
fees  payable  upon or after the  Closing  Date in  connection  with any Assumed
Leases in existence as of the Closing Date, and (iv) rentals already received by
Seller in connection  with the Assumed Leases  attributable to periods after the
Closing  Date.  All  non-delinquent  real  estate  taxes or  assessments  on the
Property shall be prorated based on the actual current tax bill, but if such tax
bill has not yet been received by Seller by the Closing Date or if  supplemental
taxes are assessed  after the Closing for the period  prior to the Closing,  the
parties shall make any necessary adjustment after the Closing by cash payment to
the party entitled thereto so that Seller shall have borne all taxes,  including
all supplemental  taxes,  allocable to the period prior to the Closing and Buyer
shall bear all taxes,  including all supplemental taxes, allocable to the period
after the Closing. If any expenses attributable to the Property and allocable to
the period prior to the Closing are discovered or billed after the Closing,  the
parties shall make any necessary adjustment after the Closing by cash payment to
the party  entitled  thereto  so that  Seller  shall  have  borne  all  expenses
allocable  to the period  prior to the Closing and Buyer shall bear all expenses
allocable  to the period  from and after the  Closing.  The  provisions  of this
Section 6.5 shall survive the Closing for a period of one (1) year.

         Ten (10) days prior to the Closing,  Escrow Agent shall deliver to each
of the parties for their review and  approval a  preliminary  closing  statement
(the "Preliminary  Closing  Statement") based on an income and expense statement
prepared by Seller,  approved by Buyer,  and  delivered to Escrow Agent prior to
said date,  setting  forth (i) the  proration  amounts  allocable to each of the
parties  pursuant to this  Section 6.5 and (ii) the Closing  Costs  allocable to
each of the parties pursuant to Section 6.6 hereof. Based on each of the party's
comments,  if any,  regarding the Preliminary  Closing  Statement,  Escrow Agent
shall  revise the  Preliminary  Closing  Statement  and deliver a final,  signed
version  of a closing  statement  to each of the  parties  at the  Closing  (the
"Closing Statement").

         6.6  Closing  Costs.  Each party  shall pay its own costs and  expenses
arising in connection with the Closing (including,  without limitation,  its own
attorney and advisor fees),  except the following  costs (the "Closing  Costs"),
which shall be allocated between the parties as follows:

                                       15

<PAGE>


                  (i) Seller shall pay all documentary  transfer,  stamp,  sales
and other taxes  related to the  transfer  of the  Property,  one-half  (1/2) of
Escrow Agent's escrow fees and costs,  and all premiums,  costs and fees related
to the  delivery  of the  Owner's  Title  Policy  (other  than  the  cost of any
endorsements  requested by Buyer), the cost of the Survey (if not already paid),
all  brokerage  commissions  payable  to John  Burnham & Company  in  connection
herewith  and with the Lease,  all  recording  fees  related to the  transfer of
ownership of the Property,  and all recording or filling fees in connection with
the Loan.

                  (ii) Buyer shall pay one-half  (1/2) of Escrow  Agent's escrow
fees and  costs,  the  cost of any  endorsements  to the  Owner's  Title  Policy
requested by Buyer,  and all recording  fees related to the financing of Buyer's
acquisition of the Property.

         6.7 Deliveries  Outside of Escrow.  Seller shall deliver  possession of
the Property,  subject to the Tenant Leases, to Buyer upon the Closing. Further,
Seller  hereby  covenants  and agrees to  deliver  to Buyer,  on or prior to the
Closing, the following items:

                  6.7.1 Approvals.  Originals of the "Approvals" (as hereinafter
defined);

                  6.7.2 Intangible Property. The Intangible Property, including,
without  limitation,  the original  Property  Documents and the original Assumed
Leases; and

                  6.7.3 Personal  Property.  The Personal  Property,  including,
without  limitation,  all keys,  pass cards,  remote  controls,  security codes,
computer software and other devices relating to access to the Improvements.

7.    SELLER'S REPRESENTATIONS AND WARRANTIES.

         Seller represents and warrants to and agrees with Buyer that, as of the
date hereof and as of the Closing Date:

         7.1 Title.

                  7.1.1  Ownership.  Seller is the legal and equitable  owner of
the  Property,  with full right to convey the same.  Seller has not  granted any
options or rights of first  refusal or rights of first offer to third parties to
purchase or otherwise acquire an interest in the Property.

                  7.1.2  Encumbrances.  To Seller's  Knowledge  (as  hereinafter
defined),  the  Property is free and clear of all liens,  encumbrances,  claims,
rights,  de-

                                       16

<PAGE>


mands,  rights  of way,  easements,  leases  (other  than  the  Tenant  Leases),
agreements,  covenants, conditions, and restrictions of any kind, except for (A)
the Permitted Exceptions, and (B) the Tenant Leases.

                  7.1.3 Encroachments.  Except as shown on the Survey, there are
no encroachments on the Property from adjoining property,  and the Property does
not encroach on adjoining property, easements, or streets.

                  7.1.4 Streets. To Seller's  Knowledge,  there are no existing,
proposed,  or  contemplated  plans to widen,  modify,  or realign  any street or
highway which affects the size of, use of, or set-backs on the Property.

         7.2 Property Documents. The Property Documents required to be delivered
by Seller pursuant to the terms hereof constitute all of the material  documents
relating to the Property and each such Property  Document as delivered by Seller
constitutes  a true,  correct and  complete  copy of such  Property  Document in
Seller's possession or control. There are no commitments or agreements affecting
the Property which have not been disclosed by Seller to Buyer in writing.

         7.3 Leases.

                  7.3.1  The  schedule  attached  hereto  as  Exhibit  "M"  (the
"Schedule of Leases") is a true,  correct and complete  statement of all (i) the
leases,  tenancies and  occupancies,  including any  extensions,  modifications,
amendments  or  guarantees  thereof  in  effect  at the  Property  (the  "Tenant
Leases"), (ii) the tenants at the Property, (iii) the dates of the Tenant Leases
(including the commencement and expiration dates thereof),  (iv) the annual base
rents payable, the base year for escalations,  the currently escalated rents and
contributions to common area maintenance, operating expenses and insurance under
the Tenant  Leases,  (v) the security  deposits held by or deposited with Seller
under the Tenant Leases, (vi) any and all options to extend, renew or cancel any
Tenant  Leases or to expand or decrease  the space  covered by any Tenant  Lease
(including  any  rights of first  refusal),  and (vii) any and all  concessions,
allowances,  credits,  rebates, offsets or other cases for relief or adjustment,
including, without limitation, any unpaid reimbursements for tenant improvements
and any "free" or "reduced" rent.

                  7.3.2 There are no security  deposits or arrearages in rent or
additional  rent  under  any of the  Tenant  Leases  except  as set forth on the
Schedule of Leases.  No rent has been  prepaid  under any Tenant Lease except as
set forth on the Schedule of Leases.

                  7.3.3 All of the  services  required  to be  supplied  to each
tenant and  maintained  in  connection  with the  Property are  presently  being
supplied and

                                       17

<PAGE>


maintained  and will continue to be supplied and  maintained up to and as of the
Closing Date.

                  7.3.4  Seller has received no notices of any failure of Seller
to supply any  services  which  Seller is  required  to furnish  pursuant to any
Tenant Lease.

                  7.3.5  Seller  has  received  no notices of any items of work,
repair,  maintenance or  construction  to be completed by Seller pursuant to any
Tenant  Lease for the benefit of any tenant and Seller has no  knowledge  of any
such work to be done.

                  7.3.6 As of the Closing  Date,  no tenant shall be entitled to
any additional work during the term of its Tenant Lease,  except as set forth on
the Schedule of Leases.

                  7.3.7  Except as set forth on the  Schedule of Leases,  Seller
has received no notice from any tenant (i) to cancel any Tenant Lease, (ii) that
such tenant is or may become  unable or  unwilling  to perform any or all of its
obligations under its Tenant Lease,  whether for financial or other reasons,  or
that an action or proceeding, voluntary or involuntary, is pending or threatened
against  such  tenant  under  any  section  or  sections  of any  bankruptcy  or
insolvency  law, or (iii) that such tenant  disputes the base rent or escalation
rents or the computation of escalation rents pursuant to its Tenant Lease.

                  7.3.8 The  Tenant  Leases  are in full  force and  effect  and
Seller has received no notice of any default by the landlord  thereunder and has
no  knowledge  of any fact or facts which would now or with the giving of notice
or the passage of time or both be a default under the terms  thereof,  except as
otherwise set forth on the Schedule of Leases.

                  7.3.9 As of the Closing  Date,  there will be no  brokerage or
other leasing  commissions  payable in connection with any of the tenants or the
Tenant Leases or any new leases or amendments of existing Tenant Leases.

                  7.3.10 All of the Tenant  Leases  are  assignable  to Buyer in
connection  with its  purchase of the  Property  without the  necessity  for any
approval, consent or additional payment.

         7.4 Condition of Property.  To Seller's  Knowledge,  the Property is in
good  condition  and  repair  and free  from  any  defects,  including,  without
limitation,   environmental,  erosion,  drainage  or  soil  problems,  physical,
structural,  mechanical,  construction  or  electrical  defects,  defects in the
parking lot pavement,  or defects in utility systems.  There is no material fact
which has not been  disclosed to Buyer in writing which has or could  reasonably
be expected to have a material  adverse effect

                                       18

<PAGE>


upon the Property, or the use or value thereof.

         7.5 Special Assessments or Condemnation.  To Seller's Knowledge,  there
are not  presently  pending (i) any special  assessments,  except those shown as
exceptions on the PTR, or (ii) condemnation  actions against the Property or any
part. Seller has not received notice of any contemplated  special assessments or
eminent domain proceedings that would affect the Property.

         7.6 Utilities. To Seller's Knowledge,  all water, sewer, electric, gas,
telephone,  and drainage facilities,  and all other utilities required by law or
for the  normal  operation  of the  Property  are (or will be prior to  Closing)
installed to the property lines of the Property,  have been (or will be prior to
Closing) connected to the Improvements  pursuant to valid permits,  are (or will
be  prior  to  Closing)  in good  working  order,  and are (or  will be prior to
Closing) adequate to service the Property.

         7.7 Permits.  Seller has obtained all  appropriate  licenses,  permits,
easements, and rights of way, including proofs of dedication, which are required
to use and operate the Property.

         7.8  Service  Contracts.  There are no  service,  maintenance,  repair,
management,  leasing, or supply contracts or other contracts (including, without
limitation,  janitorial,  elevator and  landscaping  agreements)  affecting  the
Property,  oral or written,  except as set forth on the schedule attached hereto
as Exhibit "N" (the "Service Contracts").

         7.9  Employees.  Attached  hereto  as  Exhibit  "O"  is a  schedule  of
employees  who are  employed  by Seller or the  manager of the  Property  in the
operation,  management or maintenance of the Property and the wages and benefits
that are paid to such  employees,  all of which are true and  correct  as of the
date hereof;  there are no contracts  covering such employees  other than as set
forth on such schedule and the employment of each may be terminated without cost
at the  option of Seller or the then  owner of the  Property  upon not more than
thirty (30) days prior written notice.

         7.10  Defaults.  Seller is not in default of  Seller's  obligations  or
liabilities  pertaining  to the  Property  or the  Property  Documents;  nor, to
Seller's Knowledge, are there facts, circumstances, conditions, or events which,
after  notice or lapse of time,  would  constitute  a  default.  Seller  has not
received notice or information  that any party to any of the Property  Documents
considers  a breach or  default to have  occurred;  nor has Seller any reason to
believe that there is likely to be a default under any of the documents.

                                       19

<PAGE>


         7.11 Consents and Releases.  Seller has obtained all required consents,
releases,  and permissions to convey good,  marketable and indefeasible title to
Buyer.

         7.12 Authority.  This Agreement and all other documents delivered prior
to or at the Closing (i) have been duly authorized,  executed,  and delivered by
Seller;  (ii)  are  binding  obligations  of  Seller;   (iii)  are  collectively
sufficient to transfer all of Seller's  rights to the Property;  and (iv) do not
violate the formation documents of Seller.  Seller further represents that it is
a  corporation,  duly  organized and existing in good standing under the laws of
the State of Delaware, with its principal place of business in California.

         7.13  Bankruptcy.  No  filing  or  petition  under  the  United  States
Bankruptcy  Law  or  any  insolvency  laws,  or  any  laws  for  composition  of
indebtedness or for the  reorganization of debtors has been filed with regard to
Seller.

         7.14  Certificates  of  Occupancy.  Seller  has (or will have  prior to
Closing)  all  necessary,   valid,  final  and  unconditional   certificates  of
occupancy,  or the equivalent  permitting  required by the applicable  licensing
agency, for the current use and occupancy of the Property.

         7.15  Foreign  Investment  In Real  Property  Tax Act.  Seller is not a
foreign person within the meaning of 42 USCS ss. 1445(f)(3).

         7.16  Existing  Approvals.  The  documents  set  forth on  Exhibit  "P"
attached hereto  (collectively,  the  "Approvals")  are in full force and effect
and,  to  Seller's   Knowledge,   constitute   all   necessary  or   appropriate
certifications,  approvals,  consents,  authorizations,  licenses,  and  permits
required  by any  governmental  authority  in  connection  with  the  ownership,
development,  use and  maintenance of the Property  (other than those related to
the  manufacturing  operations  of  Seller's  business  conducted  therein).  To
Seller's  Knowledge,  all of the Approvals are transferable to Buyer without the
necessity of any approval or consent or additional  payment and no such transfer
will affect the validity thereof.

         7.17 Insurance. There are currently in effect such casualty and general
liability  insurance  policies as are  customarily  maintained  with  respect to
similar  properties.  All premiums due on such insurance policies have been paid
by Seller and Seller will maintain such insurance  policies from the date hereof
through the Closing Date or earlier  termination of this  Agreement.  Seller has
not received  and has no  knowledge of any notice or request from any  insurance
company requesting the performance of any work or alteration with respect to the
Property.  Seller has received no notice from any insurance company  concerning,
nor is Seller aware of, any defects or  inadequacies  in the Property  which, if
not corrected, would result in the termination of insurance coverage or increase
its cost.

                                       20

<PAGE>


         7.18 Litigation.  There are no actions, suits or proceedings before any
judicial or  quasi-judicial  body, by any governmental  authority or other third
party, pending, or to Seller's Knowledge,  threatened,  against or affecting all
or any portion of the Property and to Seller's Knowledge,  there is no basis for
any  such  action.   There  are  no  actions,   suits  or  proceedings  pending,
contemplated  or threatened  by Seller in connection  with all or any portion of
the Property or Seller's  ownership,  rights,  use,  development  or maintenance
thereof, including,  without limitation, tax reduction proceedings; and from and
after the date hereof, Seller shall not commence or allow to be commenced on its
behalf any action,  suit or proceeding with respect to all or any portion of the
Property  without the prior written consent of Buyer. No attachments,  execution
proceedings,  assignments for the benefit of creditors, insolvency,  bankruptcy,
reorganization or other proceedings are pending, or, to Seller's best knowledge,
threatened,  against  Seller.  In the  event  any  proceeding  of the  character
described in this Section 7.18 is initiated  prior to the Closing,  Seller shall
promptly advise Buyer in writing.

         7.19  Compliance with Laws. To Seller's  Knowledge,  the Property is in
full  compliance  with all existing  laws,  rules,  regulations,  ordinances and
orders of all applicable federal, state, city and other governmental authorities
in effect as of the date of this Agreement  (collectively,  "Laws"),  including,
without limitation,  all Laws with respect to zoning,  building, fire and health
codes, environmental protection and sanitation and pollution control. Seller has
received  no notice of, and has no  knowledge  of, any  condition  currently  or
previously  existing on the Property or any portion  thereof which may give rise
to any  violation  of any  existing  Law  applicable  to the Property if it were
disclosed to the authorities having jurisdiction over the Property.

         7.20 Toxic or Hazardous Materials.

                  7.20.1 Definitions.

                  (a) "Environmental  Claim" means any claim,  action,  cause of
action,  investigation  or  notice  (written  or oral) by any  person  or entity
alleging potential liability (including, without limitation, potential liability
for investigatory  costs,  cleanup costs,  governmental  response costs, natural
resources damages,  property damages,  personal injuries,  or penalties) arising
out of, based on or resulting from (i) the manufacture,  treatment,  processing,
distribution,  use, transport,  handling, deposit, storage, disposal, leaking or
other   presence,   or  release  into  the   environment  of  any  "Material  of
Environmental  Concern" (as hereinafter  defined) in, at, on, under or about any
location,  whether  or not owned or  operated  by  Seller or (ii)  circumstances
forming the basis of any violation,  or alleged violation, of any "Environmental
Law" (as defined below).

                  (b)  "Environmental  Laws" means all federal,  state and local
laws and regulations  relating to pollution or protection of human health or the
environment

                                       21

<PAGE>


(including,  without  limitation,  laws and  regulations  relating to emissions,
discharges,  releases or  threatened  releases  of  Materials  of  Environmental
Concern,  or otherwise  relating to the manufacture,  processing,  distribution,
use,  treatment,  storage,  disposal,  transport  or  handling of  Materials  of
Environmental Concern.

                  (c)  "Material  of  Environmental  Concern"  means  chemicals,
pollutants,  contaminants,  wastes,  toxic  substances,  petroleum and petroleum
products.

                  7.20.2  Representations and Warranties.  Seller represents and
warrants  to and agrees with Buyer that,  as of the date  hereof,  and as of the
Closing Date: (i) each of the Property and Seller is in full compliance with all
applicable  Environmental  Laws  relating  to  the  Property,  which  compliance
includes,  but is not  limited to, the  possession  by Seller of all permits and
other governmental authorities required under applicable Environmental Laws, and
compliance with the terms and conditions  thereof;  (ii) Seller has not received
any  communication  (written or oral),  whether from a  governmental  authority,
citizens group,  employee or other third party,  that alleges that Seller is not
in such full  compliance  and there are no  circumstances  that may  prevent  or
interfere with such full compliance in the future;  (iii) Seller has received no
written or oral notice or other  communication  that any Environmental  Claim is
pending or threatened with regard to the Property; (iv) there are no present or,
to Seller's  Knowledge,  past actions,  activities,  circumstances,  conditions,
events or incidents relating to the Property, including, without limitation, the
manufacture,  treatment,  processing,  distribution,  use, transport,  handling,
deposit,  storage,  disposal,  leaking,  or other  presence  or  release  of any
Material  of   Environmental   Concern,   that  could  form  the  basis  of  any
Environmental  Claim against Seller or against any person or entity,  including,
without   limitation,   persons  or  entities  whose   liability  for  any  such
Environmental   Claim  Seller  has  or  may  have  retained  or  assumed  either
contractually  or by  operation  of law; and (v) without in any way limiting the
generality of the foregoing, (a) Seller has not stored, disposed or arranged for
the disposal of Materials of  Environmental  Concern on the Property,  (b) there
are no  underground  storage  tanks  located  on the  Property,  (c) there is no
asbestos  contained in or forming part of any  Improvement,  including,  without
limitation, any building,  building component,  structure or office space on the
Property, and (d) no polychlorinated  biphenyls (PCBs) are used or stored at the
Property.

                  7.20.3 Indemnification. Seller agrees to indemnify, reimburse,
defend,  and hold Buyer  harmless  from,  for and against all  demands,  claims,
actions or causes of action, assessments,  losses, damages,  liabilities,  costs
and expenses,  including, without limitation,  interest,  penalties,  reasonable
attorneys'   fees,   charges,   disbursements   and  expenses,   and  reasonable
consultants'  fees,  charges,  disbursements  and  expenses,  asserted  against,
resulting  to,  imposed  on, or incurred by Buyer,  directly or  indirectly,  in
connection  with (i) the breach of any  representation  or warranty set forth in
Section 7.20.2 of this  Agreement or (ii) any event or condition,  whether known
or

                                       22

<PAGE>


unknown to Seller or disclosed in any report  provided to Buyer,  which results,
directly or indirectly,  in an Environmental  Claim, to the extent such event or
condition  occurred,  existed,  or arose  out of  conditions  that  occurred  or
existed, or were caused, in whole or in part, on or before the Closing.

         7.21 No Restriction  on Access.  Seller has no knowledge of any pending
or threatened  restriction  or denial,  governmental  or otherwise,  which would
prohibit or adversely affect the right of access to or from the Property from or
to the  existing  highways  and roads (all of such  existing  highways and roads
being  duly  opened  and  dedicated  to  the  municipality  having  jurisdiction
thereof).

         7.22 Storm  Drainage.  To Seller's  Knowledge,  all storm water flowing
from the  Property  drains  either  into a  public  system  or onto a  permitted
location and through easements for the benefit of the Property.

         7.23 Soils.  Seller has no knowledge of any soil  conditions  adversely
affecting  the  Property  or any  part  thereof  or  Buyer's  intended  use  and
development thereof.

         7.24 No Conflicts.  The execution and delivery of this  Agreement,  the
consummation of the transactions  herein  contemplated,  and compliance with the
terms of this  Agreement  will not conflict  with, or, with or without notice or
the  passage  of time  or  both,  result  in a  breach  of any of the  terms  or
provisions  of, or constitute a default  under,  any  indenture,  deed of trust,
mortgage, loan agreement, or other document, or instrument or agreement, oral or
written, to which Seller is a party or by which Seller or the Property is bound,
or any applicable regulation of any governmental agency, or any judgment,  order
or decree of any court having  jurisdiction over Seller or all or any portion of
the Property.

         7.25 Survival. All of the representations, warranties and agreements of
Seller  set forth in this  Agreement  shall be true upon the  execution  of this
Agreement,  shall be deemed to be repeated at and as of the Closing Date without
the necessity of a separate  certificate  with respect thereto and shall survive
the  delivery of the Deed and other  Closing  instruments  and  documents  for a
period  of 12  months.  As used in  this  Agreement,  the  phrase  "to  Seller's
Knowledge" and words of similar import shall mean the best knowledge of Seller's
Chief  Executive  Officer,  Seller's  President and Seller's  Vice  President of
Operations,  after  reasonable  inquiry  and  investigation  of  the  files  and
materials readily available to such persons. Seller represents and warrants that
the foregoing  persons are those persons  affiliated with Seller  possessing the
greatest experience and familiarity with the Property,  and that no other person
presently or previously  affiliated  with Seller  possesses any equal or greater
familiarity and experience with the Property.

                                       23

<PAGE>


         7.26 As-Is.  Except as expressly set forth herein,  including,  without
limitation  elsewhere in this Article 7, and except for those warranties implied
by law in the Deed,  Seller  shall  convey the  Property to Buyer in its present
"AS-IS" condition, without any warranties, expressed or implied.

8.       BUYER'S REPRESENTATIONS AND WARRANTIES.

         Buyer represents and warrants to and agrees with Seller that, as of the
date hereof, and as of the Closing Date:

         8.1 No Conflicts.  The execution  and delivery of this  Agreement,  the
consummation of the transactions  herein  contemplated,  and compliance with the
terms of this  Agreement  will not conflict  with, or, with or without notice or
the  passage  of time  or  both,  result  in a  breach  of any of the  terms  or
provisions  of, or constitute a default  under,  any  indenture,  deed of trust,
mortgage,  loan  agreement,  or other document or instrument to which Buyer is a
party  or by  which  Buyer  is  bound,  or  any  applicable  regulation  of  any
governmental  agency,  or any  judgment,  order or decree  of any  court  having
jurisdiction over Buyer or all or any portion of the Property.

         8.2 Due Organization;  Consents.  Buyer is a corporation duly organized
and existing in good  standing  under the laws of the State of Maryland with its
principal place of business in the State of California.  All requisite corporate
action has been taken by Buyer in connection  with entering into this Agreement,
and will be taken  prior to the Closing in  connection  with the  execution  and
delivery  of the  instruments  referenced  herein  and the  consummation  of the
transactions  contemplated  hereby.  No  consent  of any  partner,  shareholder,
beneficiary,  creditor,  investor, judicial or administrative body, governmental
authority or other party is required in connection  herewith  which has not been
obtained.

         8.3 Buyer's  Authority;  Validity of Agreements.  Buyer has full right,
power and  authority to purchase  the  Property  from Seller as provided in this
Agreement  and  to  carry  out  its  obligations  hereunder.  The  individual(s)
executing  this  Agreement and the  instruments  referenced  herein on behalf of
Buyer  have the legal  power,  right and actual  authority  to bind Buyer to the
terms  hereof  and  thereof.  This  Agreement  is and all  other  documents  and
instruments  to be  executed  and  delivered  by Buyer in  connection  with this
Agreement shall be duly authorized, executed and delivered by Buyer and shall be
valid, binding and enforceable obligations of Buyer.

         8.4  Bankruptcy.   No  filing  or  petition  under  the  United  States
Bankruptcy  Law  or  any  insolvency  laws,  or  any  laws  for  composition  of
indebtedness or for the  reorganization of debtors has been filed with regard to
Buyer.

9.       ADDITIONAL COVENANTS OF SELLER.

                                       24

<PAGE>


         In  addition  to the  covenants  and  agreements  of  Seller  set forth
elsewhere in this Agreement,  Seller  covenants and agrees that between the date
hereof and the Closing Date:

         9.1 Title.  Seller shall not  directly or  indirectly  sell,  assign or
create any right, title or interest whatsoever in or to the Property,  or create
or permit to exist  thereon  any lien,  charge  or  encumbrance  other  than the
Permitted  Exceptions,  or enter into any agreement to do any of the  foregoing,
including, without limitation, any new Tenant Leases (or renewals, modifications
or  extensions  of any Tenant  Leases) or Service  Contracts,  without the prior
written consent of Buyer.

         9.2 Notice of Change in  Circumstances.  Seller shall  promptly  notify
Buyer of any change in any condition with respect to the Property or any portion
thereof or of any event or circumstance of which Seller becomes aware subsequent
to the date of this  Agreement  which  (a)  materially,  adversely  affects  the
Property or any portion  thereof or the use or  operation of the Property or any
portion  thereof,  (b) makes any  representation  or warranty of Seller to Buyer
under  this  Agreement  untrue  or  misleading,  or (c) makes  any  covenant  or
agreement  of Seller  under this  Agreement  incapable  or less  likely of being
performed,  it being expressly  understood  that Seller's  obligation to provide
information  to Buyer under this  Section 9.2 shall in no way relieve  Seller of
any liability for a breach by Seller of any of its representations,  warranties,
covenants or agreements under this Agreement.

         9.3 No Defaults; Maintenance of Property. Seller shall not default with
respect  to  the  performance  of  any  obligation  relating  to  the  Property,
including,   without  limitation,  the  payment  of  all  amounts  due  and  the
performance of all  obligations  with respect to the Tenant Leases,  the Service
Contracts and any existing indebtedness  relating to the Property.  Seller shall
operate and maintain the Property in accordance  with Seller's past practice and
all applicable Laws affecting the Property or any portion thereof.

         9.4 Exclusive  Negotiations.  Seller shall (i) remove the Property from
the market,  (ii) cease and refrain from any and all negotiations with any other
prospective  optionees or purchasers of the Property,  and (iii) advise Buyer of
any material negotiations with current or potential tenants at the Property.

         9.5  Development  Activities.  Seller  shall not take any actions  with
respect to the  development  of the  Property,  including,  without  limitation,
applying for, pursuing,  accepting or obtaining any permits,  approvals or other
development  entitlements from any governmental or other regulatory  entities or
finalizing or entering into any agreements  relating  thereto  without the prior
written  consent of Buyer  (which  consent may be granted or withheld in Buyer's
sole and absolute discretion, except with

                                       25

<PAGE>


respect to the construction of improvements to the processing and  manufacturing
facility  located on the first floor of the  Building,  in which  event  Buyer's
consent may not be  unreasonably  withheld).  Seller hereby agrees to reasonably
cooperate with Buyer in Buyer's efforts to obtain such governmental approvals as
Buyer deems necessary to permit Buyer to operate the Property as Buyer wishes.

         9.6 No Pre-Paid Rent.  Seller shall not accept any rent from any Tenant
(or any new tenant  under any new lease to which Buyer has  consented)  for more
than one (1) month in advance of the payment date.

         9.7 Service,  Management  and  Employment  Contracts.  Seller shall not
enter into, extend,  renew or replace any existing service,  property management
or  employment  contracts in respect of the Property  without the prior  written
consent of Buyer  (which  consent may be withheld in Buyer's  sole and  absolute
discretion),  unless the same shall be cancellable  without  penalty or premium,
upon not more than thirty (30) days'  notice from the owner of the  Property and
Seller shall immediately notify Buyer of any such entrance,  extension,  renewal
or replacement

         9.8 New Leases.  At Buyer's  request,  Seller shall advise Buyer of any
and all material negotiations with current or potential tenants of the Property.
Seller  shall not enter into any new lease or extend any Lease  without  Buyer's
prior  written  consent,  which  consent  may be  withheld  in Buyer's  sole and
absolute discretion.

10.      RISK OF LOSS.

         10.1  Condemnation.  If, prior to the Closing Date, all or any material
portion of the Property is taken by  condemnation  or eminent  domain (or is the
subject of a pending or  contemplated  taking  which has not been  consummated),
Seller shall immediately  notify Buyer of such fact. In such event,  Buyer shall
have the option to terminate  this Agreement upon written notice to Seller given
not later than thirty (30) days after  receipt of such notice from Seller.  Upon
such  termination,  Escrow Agent shall return the Deposit to Buyer,  the parties
shall equally share the cancellation  charges of Escrow Agent and Title Company,
and neither party shall have any further rights or obligations hereunder,  other
than pursuant to any provision  hereof which expressly  survives the termination
of this Agreement. If any condemnation or eminent domain action is not material,
or if Buyer does not elect to terminate this Agreement,  Seller shall assign and
turn over to Buyer,  and,  subject  to the terms of the  Lease,  Buyer  shall be
entitled to receive and keep, all awards for the taking by condemnation or Buyer
shall be deemed to have  accepted  the  Property  subject to the taking  without
reduction in the  Purchase  Price.  For purposes of this Section  10.1, a taking
action  shall be deemed to be  material  if the value of the  property  which is
subject to such action equals or exceeds  $100,000,  or if such action otherwise
has an adverse affect upon Buyer's intended use, operation or development of the
Property.

                                       26

<PAGE>


         10.2 Casualty. Prior to the Closing and notwithstanding the pendency of
this  Agreement,  the  entire  risk of  loss or  damage  by  earthquake,  flood,
landslide, fire, hurricane, tornado or other casualty shall be borne and assumed
by Seller. If, prior to Closing any part of the Property is damaged or destroyed
by earthquake,  flood,  landslide,  fire, hurricane,  tornado or other casualty,
Seller shall  immediately  notify Buyer of such fact. In the event of a material
casualty,  Buyer  and,  so long  as such  casualty  was  not the  result  of the
negligence  or wilful  misconduct  of Seller,  Seller,  shall have the option to
terminate this Agreement in accordance  with the preceding  section upon written
notice to the other party given not later than thirty (30) days after receipt of
any such notice from Seller.  If the casualty is not  material,  or if Buyer and
Seller do not elect to terminate  this  Agreement,  Seller shall assign and turn
over,  and Buyer shall be entitled to receive and keep,  all insurance  proceeds
payable with respect to such destruction (which shall then be repaired or not at
Buyer's option and cost), plus Seller shall pay over to Buyer an amount equal to
the deductible  amount with respect to the insurance and any uninsured loss, and
the  parties  shall  proceed to Closing  pursuant  to the terms  hereof  without
modification  of the terms of this  Agreement  and without any  reduction in the
Purchase  Price.  If this Agreement is not terminated by reason of any casualty,
Buyer shall have the right to  participate  in any  adjustment  of the insurance
claim.  For purposes of this Section,  a casualty shall be deemed to be material
if the estimated cost to repair the same equals or exceeds $250,000.

11.      LIQUIDATED DAMAGES; SPECIFIC PERFORMANCE.

         11.1  Liquidated  Damages.  IN THE  EVENT  THAT  THE  ESCROW  AND  THIS
TRANSACTION  FAIL TO CLOSE  SOLELY  AS A RESULT OF THE  DEFAULT  OF BUYER IN THE
PERFORMANCE OF ITS OBLIGATIONS UNDER THIS AGREEMENT, BUYER AND SELLER AGREE THAT
SELLER'S ACTUAL DAMAGES WOULD BE  IMPRACTICABLE  OR EXTREMELY  DIFFICULT TO FIX.
THE PARTIES  THEREFORE AGREE THAT IN THE EVENT THAT ESCROW AND THIS  TRANSACTION
FAIL TO CLOSE SOLELY AS A RESULT OF THE DEFAULT OF BUYER IN THE  PERFORMANCE  OF
ITS OBLIGATIONS  HEREUNDER AND SELLER IS READY,  WILLING AND ABLE TO PERFORM ITS
OBLIGATIONS  HEREUNDER,  SELLER,  AS  SELLER'S  SOLE AND  EXCLUSIVE  REMEDY,  IS
ENTITLED  TO  LIQUIDATED  DAMAGES IN THE  AMOUNT OF THE  DEPOSIT  (INCLUSIVE  OF
INTEREST AND DIVIDENDS  EARNED  THEREON) THEN HELD BY ESCROW AGENT. IN THE EVENT
ESCROW FAILS TO CLOSE SOLELY AS A RESULT OF BUYER'S DEFAULT AND SELLER IS READY,
WILLING AND ABLE TO PERFORM ITS OBLIGATIONS  HEREUNDER,  THEN (1) THIS AGREEMENT
AND THE RIGHTS AND  OBLIGATIONS  OF BUYER AND  SELLER  HEREUNDER  AND THE ESCROW
CREATED HEREBY SHALL TERMINATE, (2) ESCROW AGENT SHALL, AND IS HEREBY AUTHORIZED
AND INSTRUCTED TO, RETURN PROMPTLY TO BUYER AND

                                       27

<PAGE>


SELLER ALL DOCUMENTS AND  INSTRUMENTS TO THE PARTIES WHO DEPOSITED THE SAME, AND
(3) ESCROW AGENT SHALL DELIVER THE DEPOSIT  (INCLUSIVE OF INTEREST AND DIVIDENDS
EARNED  THEREON)  THEN  HELD BY  ESCROW  AGENT TO SELLER  PURSUANT  TO  SELLER'S
INSTRUCTIONS,  AND THE SAME SHALL BE THE FULL,  AGREED AND  LIQUIDATED  DAMAGES.
SELLER AND BUYER  ACKNOWLEDGE  THAT THEY HAVE READ AND UNDERSTAND THE PROVISIONS
OF THIS SECTION 11.1, AND BY THEIR INITIALS  IMMEDIATELY BELOW AGREE TO BE BOUND
BY ITS TERMS.


    /s/ JRG                                                          /s/ AG
- -----------------                                               ----------------
Seller's Initials                                               Buyer's Initials


         11.2  Default  by  Seller.  In  the  event  that  the  Closing  of  the
transaction  contemplated  in this  Agreement  does not  occur by  reason of any
default by Seller,  then (i) Escrow  Agent shall return the Deposit to Buyer and
(ii) Buyer shall be entitled to pursue any remedy available to it hereunder,  at
law or in  equity,  other  than  the  specific  performance  of this  Agreement;
provided,  however,  that in the event that Seller's default hereunder is wilful
and Buyer and Seller have agreed upon the form of Lease and the Loan  Documents,
Buyer  shall  also be  entitled  to  pursue  the  specific  performance  of this
Agreement.

12.      BROKERS.

Seller   and Buyer each hereby  represent,  warrant to and agree with each other
         that  there  are no broker or finder  fees or  commissions  payable  in
         connection with the transaction contemplated hereby (including, without
         limitation,  the  Lease),  other than those  payable to John  Burnham &
         Company  which  shall be paid by Seller in  accordance  with a separate
         agreement.  Seller  shall  indemnify,  protect,  defend  and hold Buyer
         harmless from and against any and all claims,  losses,  damages,  costs
         and expenses  (including  attorneys' fees,  charges and  disbursements)
         incurred  by  Buyer  by  reason  of any  breach  or  inaccuracy  of the
         representation,  warranty  and  agreement  of Seller  contained in this
         Section 12.  Buyer  shall  indemnify,  protect,  defend and hold Seller
         harmless from and against any and all claims,  losses,  damages,  costs
         and expenses  (including  attorneys' fees,  charges and  disbursements)
         incurred  by  Seller  by reason  of any  breach  or  inaccuracy  of the
         representation,  warranty  and  agreement  of Buyer  contained  in this
         Section 12. The provisions of this Section 12 shall survive the Closing
         or earlier termination of this Agreement.

13.      CONFIDENTIALITY.

         13.1 Buyer.  Buyer agrees that until the  Closing,  except as otherwise

                                       28

<PAGE>


provided  herein or required by law and except for the  exercise by Buyer of any
remedy  hereunder,  Buyer  shall  (a) keep  confidential  the  pendency  of this
transaction and the documents and information  supplied by Seller to Buyer,  (b)
disclose  such  information  only to  Buyer's  agents,  employees,  contractors,
consultants  or  attorneys,  as well as lenders  (if any),  investment  bankers,
venture capital groups,  investors,  title company personnel and Tenants, with a
need to  know  in  connection  with  Buyer's  review  and  consideration  of the
Property,   provided  that  Buyer  shall  inform  all  persons   receiving  such
information  from Buyer of the  confidentiality  requirement  and (to the extent
within Buyer's control) cause such confidence to be maintained, and (c) upon the
termination of this Agreement  prior to the Closing,  return to Seller  promptly
upon  request  all  copies  of  documents  and  materials  supplied  by  Seller.
Disclosure of information by Buyer shall not be prohibited if that disclosure is
of information  that is or becomes a matter of public record or public knowledge
as a result of the Closing of this  transaction or from sources other than Buyer
or its agents, employees, contractors, consultants or attorneys.

         13.2  Seller.  Seller  agrees that both prior to and after the Closing,
except as otherwise  provided herein  (including the Estoppel  Certificates)  or
required by law, and except for the exercise by Seller of any remedy  hereunder,
Seller shall (a) keep  confidential  the pendency of this transaction with Buyer
and the identity of Buyer and the  relationship  between Buyer and the entity to
which Buyer may assign this Agreement or which Buyer  designates as the party to
whom Seller  shall convey the  Property at the  Closing,  and (b) disclose  such
information  only to Seller's  agents,  employees,  contractors,  consultants or
attorneys,  as well as Tenants and title company personnel,  with a need to know
such  information in connection with effecting this  transaction,  provided that
Seller shall inform all such persons  receiving  such  confidential  information
from  Seller  of the  confidentiality  requirement  and  (to the  extent  within
Seller's  control)  cause such  confidence to be  maintained.  Disclosure of the
pendency  of  this  transaction  by  Seller  shall  not be  prohibited  if  that
disclosure  is of  information  that is or becomes a matter of public  record or
public  knowledge as a result of the Closing of this transaction or from sources
other  than  Seller  or  its  agents,  employees,  contractors,  consultants  or
attorneys.

14.      INDEMNIFICATION.

         Buyer hereby agrees to indemnify,  defend and hold Seller harmless from
and  against  any  claims,   demands,   obligations,   losses,  costs,  damages,
liabilities,  judgments  or  expenses  (including  reasonable  attorneys'  fees,
charges and  disbursements)  arising out of or in connection with the ownership,
operation or maintenance of the Property after the Closing. Seller hereby agrees
to  indemnify,  defend and hold Buyer  harmless  from and  against  any  claims,
demands, obligations, losses, costs, damages, liabilities, judgments or expenses
(including reasonable attorneys' fees, charges and disbursements) arising out of
or in connection  with the  ownership,  opera-

                                       29

<PAGE>


tion or maintenance  of the Property prior to the Closing.  Each party shall do,
execute and deliver, or shall cause to be done, executed and delivered, all such
further acts and  instruments  which the other party may  reasonably  request in
order  to  more  fully  effectuate  the  indemnifications  provided  for in this
Agreement. The provisions of this Section 14 shall survive the Closing.

15.      MISCELLANEOUS PROVISIONS.

         15.1 Governing Law. This Agreement and the legal relations  between the
parties  hereto shall be governed by and  construed  and enforced in  accordance
with the laws of the State of  California,  without  regard to its principles of
conflicts of law.

         15.2 Entire Agreement; Modifications; Waiver.

                  15.2.1  Entire  Agreement.   This  Agreement,   including  the
exhibits and schedules attached hereto, constitutes the entire agreement between
Buyer and Seller  pertaining  to the subject  matter hereof and  supersedes  all
prior   agreements,   understandings,   letters  of  intent,   negotiations  and
discussions,  whether  oral  or  written,  of  the  parties,  and  there  are no
warranties,  representations  or other agreements,  express or implied,  made to
either party by the other party in  connection  with the subject  matter  hereof
except as specifically set forth herein or in the documents  delivered  pursuant
hereto or in  connection  herewith.  Without  limiting the  foregoing,  upon the
execution of this  Agreement,  that certain Letter of Intent,  dated November 6,
1997,  between Buyer and Seller,  shall  terminate and be of no further force or
effect.

                  15.2.2 Modification.  No supplement,  modification,  waiver or
termination of this Agreement shall be binding unless executed in writing by the
party to be bound thereby. No waiver of any provision of this Agreement shall be
deemed or shall  constitute a waiver of any other  provision  hereof (whether or
not  similar),  nor shall such waiver  constitute  a  continuing  waiver  unless
otherwise expressly provided.

         15.3 Notices.  All notices,  consents,  requests,  reports,  demands or
other communications hereunder (collectively, "Notices") shall be in writing and
may be given personally, by registered or certified mail, by Federal Express (or
other reputable overnight delivery service) by telex or telegram or by facsimile
transmission.

         To Buyer:                      Alexandria Real Estate Equities, Inc.
                                        135 N. Los Robles Avenue, Suite 250
                                        Pasadena, California 91101
                                        Attention:  Corporate Secretary
                                        Telephone:  (818) 578-0777
                                        Facsimile:  (818) 578-0770

                                       30

<PAGE>


         With A Copy to:                Alexandria Real Estate Equities, Inc.
                                        11440 West Bernardo Court, Suite 170
                                        San Diego, California  92127
                                        Attention:  Gary A. Kreitzer, Esq.
                                        Telephone:  (619) 592-6801
                                        Facsimile:    (619) 592-6814

         With A Copy To:                Skadden, Arps, Slate, Meagher & Flom LLP
                                        300 South Grand Avenue, Suite 3400
                                        Los Angeles, California  90071
                                        Attention:  George M. Eshaghian, Esq.
                                        Telephone:  (213) 687-5215
                                        Facsimile:  (213) 687-5600

         To Seller:                     Matrix Pharmaceuticals, Inc.
                                        4757 Nexus Centre Drive
                                        San Diego, California 92121
                                        Attention:  Mr. Ron Lucas
                                        Telephone:  (619) 824-5121
                                        Facsimile:  (619) 643-5699

         With A Copy To:                Brobeck, Phlegar & Harrison LLP
                                        550 W. "C" Street, Suite 1300
                                        San Diego, California 92101
                                        Attention: Scott Biel, Esq.
                                        Telephone:  (619) 234-1966
                                        Facsimile:  (619) 234-3848

         To Escrow Agent:               Chicago Title Company
                                        925 "B" Street
                                        San Diego, California  92101
                                        Attention:  Ms. Lori Brandt
                                        Telephone:  (619) 544-6254
                                        Facsimile:  (619) 544-6229

or to such other address or such other person as the addressee  party shall have
last  designated  by notice to the other party.  Notices given by telex shall be
deemed  to  be  received  when  answered   back;   notices  given  by  facsimile
transmission  shall be  deemed  to be  received  when  confirmed;  and all other
Notices shall have been deemed to have been given when received.

         15.4  Expenses.  Subject to the allocation of Closing Costs provided in
Section  6.6  hereof,  whether  or not  the  transactions  contemplated  by this
Agreement

                                       31

<PAGE>


shall be  consummated,  all fees and  expenses  incurred by any party  hereto in
connection with this Agreement shall be borne by such party.

         15.5 Assignment.

                  15.5.1  Seller's  Right to Assign.  Seller  shall not have the
right,  power, or authority to assign,  pledge or mortgage this Agreement or any
portion of this  Agreement,  or to delegate  any duties or  obligations  arising
under  this  Agreement,  voluntarily,  involuntarily,  or by  operation  of law,
without Buyer's prior written consent.

                  15.5.2 Buyer's Right to Assign.  Except as otherwise  provided
in this Agreement,  Buyer shall have the right,  power,  and authority to assign
this  Agreement  (including,  without  limitation,  an  assignment  for security
purposes)  or any  portion  of this  Agreement  or to  delegate  any  duties  or
obligations  arising  under this  Agreement,  voluntarily,  involuntarily  or by
operation of law, without Seller's consent, to any entity or person controlling,
controlled  by or under common  control with Buyer.  Upon an  assignment,  Buyer
shall be relieved of all obligations under this Agreement and the Escrow, except
for its obligations under Section 4.1.1.5 hereof.

         15.6  Severability.  Any provision or part of this  Agreement  which is
invalid or unenforceable in any situation in any jurisdiction  shall, as to such
situation  and such  jurisdiction,  be  ineffective  only to the  extent of such
invalidity and shall not affect the  enforceability of the remaining  provisions
hereof or the  validity or  enforceability  of any such  provision  in any other
situation or in any other jurisdiction.

         15.7  Successors  and Assigns;  Third  Parties.  Subject to and without
waiver of the  provisions  of Section  15.5 hereof,  all of the rights,  duties,
benefits,  liabilities and obligations of the parties shall inure to the benefit
of, and be binding upon,  their  respective  successors  and assigns.  Except as
specifically  set forth or  referred  to herein,  nothing  herein  expressed  or
implied is intended or shall be  construed  to confer upon or give to any person
or entity,  other than the parties hereto and their  successors or assigns,  any
rights or remedies under or by reason of this Agreement.

         15.8   Counterparts.   This  Agreement  may  be  executed  in  as  many
counterparts  as may be deemed  necessary and  convenient,  and by the different
parties hereto on separate counterparts,  each of which, when so executed, shall
be deemed an original,  but all such  counterparts  shall constitute one and the
same instrument.

         15.9  Headings.   The  section  headings  of  this  Agreement  are  for
convenience  of  reference  only and shall not be  deemed  to  modify,  explain,
restrict, alter or affect the meaning or interpretation of any provision hereof.

         15.10 Time of the Essence. Time shall be of the essence with respect to

                                       32

<PAGE>


all matters contemplated by this Agreement.

         15.11 Further Assistance. In addition to the actions recited herein and
contemplated to be performed,  executed,  and/or  delivered by Seller and Buyer,
Seller  and  Buyer  agree to  perform,  execute  and/or  deliver  or cause to be
performed, executed and/or delivered at the Closing or after the Closing any and
all such further acts,  instruments,  deeds and  assurances as may be reasonably
required to consummate the transactions contemplated hereby.

         15.12 Number and Gender. Whenever the singular number is used, and when
required by the context,  the same includes the plural, and the masculine gender
includes the feminine and neuter genders.

         15.13 Construction. This Agreement shall not be construed more strictly
against one party hereto than against any other party hereto merely by virtue of
the fact that it may have been prepared by counsel for one of the parties.

         15.14 Post-Closing Access to Records. Upon receipt by Seller of Buyer's
reasonable  written  request at anytime and from time to time within a period of
one (1) year  after the  Closing,  Seller  shall  make  available  (or cause its
property  manager or asset manager,  as applicable,  to make available) to Buyer
and its  accountants  and  designees,  for  inspection and copying during normal
business hours and at Buyer's sole cost and expense,  (i) all accounting records
relating to the Property for the calendar  year period ended  December 31, 1997,
and for the period(s) from January 1, 1998, through the Closing Date, including,
without  limitation,  all general ledgers,  cash receipts,  cancelled checks and
other  accounting  documents or  information  reasonably  requested by Buyer and
related to the Property,  and (ii) all other records related to the Property, in
either case whether in the possession or control of Seller or Seller's  property
manager,  asset manager or other agent. In addition, in connection with any such
accounting information,  Seller shall provide Buyer and Buyer's accountants with
a representation  letter in form and substance customarily provided to certified
public  accountants  when  performing  an audit  in  accordance  with  generally
accepted auditing standards.

         15.15 Exhibits. All exhibits attached hereto are hereby incorporated by
reference as though set out in full herein.

         15.16  Attorneys' Fees. In the event that either party hereto brings an
action or proceeding  against the other party to enforce or interpret any of the
covenants,   conditions,   agreements  or  provisions  of  this  Agreement,  the
prevailing  party in such action or proceeding  shall be entitled to recover all
costs and expenses of such action or proceeding,  including, without limitation,
attorneys'  fees,  charges and  disbursements,  and the fees and costs of expert
witnesses.

                                       33

<PAGE>


         15.17 Business Days. As used herein, the term "Business Day" shall mean
a day that is not a  Saturday,  Sunday or legal  holiday.  In the event that the
date for the  performance  of any covenant or  obligation  under this  Agreement
shall fall on a  Saturday,  Sunday or legal  holiday,  the date for  performance
thereof shall be extended to the next Business Day.

         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the day and year first above written.

                                         BUYER:

                                         ALEXANDRIA REAL ESTATE EQUITIES,
                                         INC., a Maryland corporation


Execution Date: February 5, 1998         By: /s/ Alan D. Gold
                                             -----------------------------------
                                              Name: Alan Gold
                                                    ----------------------------
                                              Its: President
                                                   -----------------------------


                                         SELLER:

                                         MATRIX PHARMACEUTICALS, INC.,
                                         a Delaware corporation


Execution Date: February 3, 1998         By: /s/ James R. Glynn
                                             -----------------------------------
                                              Name:    James R. Glynn
                                                    ----------------------------
                                              Its: Senior Vice President and CFO
                                                   -----------------------------


ESCROW AGENT:
The  undersigned  Escrow Agent accepts the  foregoing  Agreement of Purchase and
Sale and Joint Escrow  Instructions and agrees to act as Escrow Agent under this
Agreement in strict accordance with its terms.

CHICAGO TITLE INSURANCE COMPANY     Date: February 6, 1998


By: /s/ Lori Brandt
   -----------------------------
         Name:  Lori Brandt
              ------------------
         Its: Escrow Officer
              ------------------

                                       34

<PAGE>


                                LIST OF EXHIBITS


EXHIBIT "A-1"     LEGAL DESCRIPTION OF IMPROVED PARCEL
EXHIBIT "A-2"     LEGAL DESCRIPTION OF UNIMPROVED PARCEL
EXHIBIT "A-3"     EXCLUDED IMPROVEMENTS AND FIXTURES

EXHIBIT "B-1"     PERSONAL PROPERTY INVENTORY
EXHIBIT "B-2"     EXCLUDED PERSONAL PROPERTY

EXHIBIT "C"       SURVEYOR'S CERTIFICATE

EXHIBIT "D"       DEED

EXHIBIT "E"       PROPERTY QUESTIONNAIRE

EXHIBIT "F"       SELLER'S CERTIFICATE

EXHIBIT "G"       ASSIGNMENT OF LEASES

EXHIBIT "H"       BILL OF SALE AND ASSIGNMENT

EXHIBIT "I"       ESTOPPEL CERTIFICATE

EXHIBIT "J-1"     NONFOREIGN AFFIDAVIT
EXHIBIT "J-2"     FORM 590

EXHIBIT "K"       LEASE
EXHIBIT "K-1"     LEASE TERM SHEET

EXHIBIT "L"       LOAN TERM SHEET

EXHIBIT "M"       TENANT LEASES

EXHIBIT "N"       SERVICE CONTRACTS

EXHIBIT "O"       EMPLOYEES

EXHIBIT "P"       APPROVALS

                                       35

<PAGE>


                                  Exhibit "A-1"

                      LEGAL DESCRIPTION OF IMPROVED PARCEL


         Parcel 1 of Parcel Map 17892,  in the City of San Diego,  County of San
Diego,  State of California,  according to Map filed in the Office of the County
Recorder of San Diego County on August 6, 1997.

                                       36

<PAGE>


                                  Exhibit "A-2"

                     LEGAL DESCRIPTION OF UNIMPROVED PARCEL


         Parcel 2 of Parcel Map 17892,  in the City of San Diego,  County of San
Diego,  State of California,  according to Map filed in the Office of the County
Recorder of San Diego County on August 6, 1997.

                                       37

<PAGE>


                                  Exhibit "A-3"

                DESCRIPTION OF EXCLUDED IMPROVEMENTS AND FIXTURES

To be agreed  upon by Buyer and  Seller on or before the  expiration  of the Due
Diligence Period.

                                       38

<PAGE>


                                  Exhibit "B-1"

                           PERSONAL PROPERTY INVENTORY


To be agreed  upon by Buyer and  Seller on or before the  expiration  of the Due
Diligence Period.

                                       39

<PAGE>


                                  Exhibit "B-2"

                           EXCLUDED PERSONAL PROPERTY


To be agreed  upon by Buyer and  Seller on or before the  expiration  of the Due
Diligence Period.

                                       40

<PAGE>


                                   Exhibit "C"

                             SURVEYOR'S CERTIFICATE


         The undersigned  hereby certifies to:  Alexandria Real Estate Equities,
Inc.; and [TITLE COMPANY]; as of _______________as follows: that this survey was
actually  made upon the  ground  and was  completed  on_____________;  that this
survey and the other  information,  courses  and  distances  shown  thereon  are
accurate; that the title lines and lines of actual possession are the same; that
the property  description  "closes" by mathematical  calculation;  that the land
depicted on the survey forms one contiguous parcel, uninterrupted by any strips,
gaps or gores;  that this survey correctly shows the size,  location and type of
all  buildings,  structures and other  improvements  on the property and all are
within the boundary lines and applicable  setback lines (whether  established by
subdivision plat, recorded  restrictions or applicable zoning or building codes)
affecting  the  property;  that there are no  easements,  rights-of-way  or uses
affecting  the  property  known to the  undersigned  or appeared  from a careful
physical inspection of the same, other than those shown on the survey,  together
with the applicable recording references;  that municipal water, sanitary sewer,
telephone,  electric  and gas  services  for the  operation  of the property are
present on the  property or within  adjacent  public  rights-of-way  or recorded
easements in the  locations  shown on the survey;  that there are no party walls
with or encroachments upon adjoining  premises,  streets or alleys by any of the
buildings,  structures or other  improvements on the property,  or encroachments
upon or party  walls  with the  property  by any  building,  structure  or other
improvements situated upon any adjoining premises;  that the buildings and other
improvements  on the property do not overhang or encroach  upon any easements or
rights-of-way  of others;  that all public  streets  necessary for access to the
property have been  completed  and dedicated and there is direct access  between
such streets and the property;  that the property contains  _____________ square
feet  (__________acres)  and is located in a zoning district  classification  of
_____;  that the  property  contains  _____  ordinary  parking  spaces  and ____
handicapped  parking  spaces,  totaling _____ ordinary and  handicapped  parking
spaces;  that the property  lies within a flood hazard area  designated as Flood
Zone ____, shown on special flood hazard map published by the Federal  Emergency
Management Agency;  that the street address of the property is  _______________;
that the  property  shown on this survey is the same  property  described in the
following  revised title  insurance  commitment:____________,  Commitment  Date:
______________;  that the location of each easement,  right-of-way over the land
of others are  required for (i) access to and egress from the parcel over a duly
dedicated and accepted  all-weather  public street or highway,  (ii) drainage of
surface or other water off the parcel, (iii) any utilities which currently serve
the parcel and the current improvements,  or (iv) storm water and sanitary sewer
facilities which serve the parcel and the current improvements; unless otherwise
shown or  detailed  on the  survey,  the  subject  property  does not  serve any
adjoining  property for drainage  utilities,  parking,  ingress or egress.  This
survey was made on the ground in accordance  with the "Minimum  Stan-

                                       41

<PAGE>


dard Detail  Requirements  and  Classification  for Land Title Surveys"  jointly
established  by ALTA and ACSM in 1992,  and includes Items 1-4, 6-11 and 13, and
meets the accuracy  requirements of an Urban Survey,  as defined  therein.  This
survey  also  was  made in  accordance  with the  State  of  California  Minimum
Standards of Practice for Land Surveyors.

                                       42

<PAGE>


                                    Exhibit D

                                      DEED

RECORDING REQUESTED BY
AND WHEN RECORDED RETURN TO:

Skadden, Arps, Slate, Meagher & Flom LLP
300 South Grand Avenue, Suite 3400
Los Angeles, California  90071
Attention:  George M. Eshaghian, Esq.

MAIL TAX STATEMENTS TO:
Alexandria Real Estate Equities, Inc.
11440 West Bernardo Court, Suite 170
San Diego, California 92127
Attention:  Property Manager

      ---------------------------------------------------------------------
                  Space above this line for Recorder's use only

                                   GRANT DEED

                                                         A.P.N. _______________
The undersigned Grantor declares:
Documentary transfer tax is not shown pursuant to R&T ss. 11932
         ( )    computed on full value of property conveyed, or
         ( )    computed  on full  value  less  value of liens and  encumbrances
                remaining at time of sale.
         ( )    Unincorporated area                   (x) City of San Diego, and

         FOR VALUABLE  CONSIDERATION,  the receipt and  sufficiency  of which is
hereby  acknowledged,  MATRIX  PHARMACEUTICALS,  INC.,  a  Delaware  corporation
("Grantor"),  has granted, sold and conveyed,  and by these presents does hereby
grant, sell and convey, unto [ALEXANDRIA REAL ESTATE EQUITIES,  INC., a Maryland
corporation]  ("Grantee"),  that certain property located in the City and County
of San Diego, State of California and more particularly described on Exhibit "A"
attached hereto and incorporated herein by reference (the "Property").

         TO HAVE AND TO HOLD the  Property,  together  with all and singular the
rights and  appurtenances  thereto in anywise  belonging unto the said Property,
subject only to  non-delinquent  taxes and assessments and the matters described
on Exhibit "B" attached hereto and incorporated herein by this reference.

                                       43

<PAGE>


         IN WITNESS  WHEREOF,  Grantor has caused this Grant Deed to be executed
this ___ day of _________________, 1998.

                                            MATRIX PHARMACEUTICALS, INC.
                                            a Delaware corporation


                                            By:  _______________________________
                                                 Name:
                                                 Its:

                                       44

<PAGE>


STATE OF ___________________          )
                                      : ss.
COUNTY OF _________________           )


         On the  __ day of  _____________,  199__,  before  me,  _______________
___________________________________________________________, personally appeared
__________________________________________________________________________,  [ ]
personally  known to me or o proved to me on the basis of satisfactory  evidence
to be the person(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
authorized  capacity(ies),   and  that  by  his/her/their  signature(s)  on  the
instrument  the  person(s),  or the entity  upon  behalf of which the  person(s)
acted, executed the instrument.

WITNESS my hand and official seal.

__________________________________
(SEAL)

                                       45

<PAGE>


                            Exhibit "A" to Grant Deed

                                LEGAL DESCRIPTION

                                       46

<PAGE>


                            Exhibit "B" to Grant Deed

                              PERMITTED EXCEPTIONS

                                       47

<PAGE>


                                   Exhibit "E"

                             PROPERTY QUESTIONNAIRE

                                    Attached.

                                       48

<PAGE>


                                   Exhibit "F"


                              SELLER'S CERTIFICATE

         The undersigned hereby certifies to ___________________("Buyer")  that,
as of the date hereof,

         (i)  all  of  the   representations,   covenants   and   warranties  of
____________________________.  ("Seller")  made in or pursuant  to that  certain
Purchase  and  Sale  Agreement  and  Joint  Escrow  Instructions,  dated  as  of
___________,  1997 (the "Agreement"),  between Seller and Alexandria Real Estate
Equities, Inc. ("ARE") are true, accurate, correct and complete;

         (ii) all  conditions  to the  Closing  (as such term is  defined in the
Agreement)  that  Seller  was to  satisfy or  perform  have been  satisfied  and
performed; and

         (iii) all  conditions  to the Closing  that ARE or Buyer was to perform
have been satisfied and performed.



Dated: _________, 199__                     ___________________________________,
                                            a ____________________________


                                            By:  _______________________________
                                            Name:
                                            Title:

                                       49

<PAGE>


                                   Exhibit "G"


                ASSIGNMENT OF LEASES AND TENANT SECURITY DEPOSITS

         THIS ASSIGNMENT OF LEASES AND TENANT SECURITY  DEPOSITS  ("Assignment")
is made and entered into as of the ___ day of ___________,  19__, by and between
_______________ ("Assignor"), and ______________ ("Assignee").


                                    RECITALS

         WHEREAS,  Assignor, as landlord,  has entered into those certain leases
identified on Exhibit "A" attached hereto and  incorporated  herein by reference
(collectively,  together  with  all  amendments,   modifications,   supplements,
restatements  and  guarantees  thereof which are identified on said Exhibit "A,"
the "Assumed  Leases"),  for certain  property located in the City of _________,
County of _________, State of _________;

         WHEREAS, Assignor and Alexandria Real Estate Equities, Inc., a Maryland
corporation ("ARE"), have entered into that certain Purchase and Sale Agreement,
dated as of _________ (as amended, the "Purchase Agreement");

         WHEREAS,  pursuant to Section ____ of the Purchase  Agreement,  ARE has
assigned its interest in the Purchase Agreement to Assignee; and

         WHEREAS,  the  Purchase  Agreement  requires  Assignor  and Assignee to
execute this Assignment.

         NOW, THEREFORE,  for good and valuable  consideration,  the receipt and
sufficiency of which are hereby acknowledged, Assignor and Assignee hereby agree
as follows:

         1.  Definitions.  All capitalized  terms used but not otherwise defined
herein  shall have the  respective  meanings  provided  therefor in the Purchase
Agreement.

         2.  Assignment and  Assumption.  From and after the date hereof for the
remainder of the term of each of the Assumed Leases, Assignor hereby irrevocably
assigns, sets over, transfers,  grants,  bargains and conveys to Assignee all of
Assignor's  right,  title and interest in and to (i) the Assumed Leases and (ii)
all security  deposits made under the Assumed Leases (the "Security  Deposits").
Subject to the terms and conditions of the Purchase  Agreement,  Assignee hereby
accepts this  Assignment of the Assumed  Leases,  the Security  Deposits and the
rights granted herein.  Assignee hereby  expressly  assumes,  for itself and its
successors, assigns and legal representatives, the Assumed Leases and all of the
obligations and liabilities, fixed and contingent, of

                                       50

<PAGE>


Assignor  thereunder  first  accruing and arising from and after the date hereof
with  respect to the  Assumed  Leases and agrees to (a) be fully bound by all of
the  terms,  covenants,  agreements,  provisions,  conditions,  obligations  and
liability  of Assignor  thereunder,  which first accrue and arise from and after
the date  hereof,  and (b) keep,  perform and observe all of the  covenants  and
conditions  contained therein on the part of Assignor to be kept,  performed and
observed, from and after the date hereof.

         3.  Indemnifications.  Assignor  hereby agrees to  indemnify,  protect,
defend and hold Assignee  harmless from and against any and all claims,  losses,
damages,   costs  and  expenses  (including,   without  limitation,   reasonable
attorneys' fees, charges and disbursements)  incurred or suffered by Assignee in
connection  with the Assumed  Leases and  arising or accruing  prior to the date
hereof.  Assignee hereby agrees to indemnify,  protect, defend and hold Assignor
harmless  from and  against any and all  actions,  suits,  proceedings,  claims,
losses, damages, costs and expenses (including,  without limitation,  reasonable
attorneys' fees, charges and disbursements)  incurred or suffered by Assignor in
connection  with the Assumed  Leases and first  arising and accruing on or after
the date hereof.

         4. General Provisions.

                  4.1.  Successors.  This  Assignment  shall be binding upon and
inure to the benefit of the parties  hereto and their  respective  heirs,  legal
representatives, successors and assigns.

                  4.2  Counterparts.  This Assignment may be executed in as many
counterparts  as may be deemed  necessary and  convenient,  and by the different
parties hereto on separate counterparts,  each of which, when so executed, shall
be deemed an original,  but all such  counterparts  shall constitute one and the
same instrument.

                  4.3. Governing Law. This Assignment and the legal relations of
the parties hereto shall be governed by and construed and enforced in accordance
with the laws of the State of  California,  without  regard to its principles of
conflicts of law.

                  4.4  Construction  with Respect to Principal  Agreement.  This
Assignment  is made  pursuant to and  governed by all of the terms,  conditions,
warranties,  representations,  disclaimers,  indemnities  and limitations of the
Purchase Agreement, which are incorporated herein by this reference.

                  4.5 No Other Leases  Assigned.  Except for the Assumed Leases,
Assignee  has not assumed  any  obligations  under or with  respect to any other
leases heretofore entered into with respect to the Property,  including, without
limitation, the Retained Leases, which obligations are retained by Assignor.

                                       51

<PAGE>


         IN WITNESS  WHEREOF,  this  Assignment  was made and executed as of the
date first above written.

                                            ASSIGNOR:

                                            ____________________________________


                                            By:  _______________________________
                                            Name:
                                            Its:




                                            ASSIGNEE:

                                            ____________________________________


                                            By:  _______________________________
                                            Name:
                                            Its:

                                       52

<PAGE>


                                   Exhibit "H"

                           BILL OF SALE AND ASSIGNMENT

         THIS  BILL  OF SALE  AND  ASSIGNMENT  ("Bill  of  Sale")  is made as of
____________,  1997,  by  _______________,   a  _______________  ("Seller"),  to
_____________________, a ________________________ ("Buyer").


                                    RECITALS

         WHEREAS,  Seller is the owner of that certain real property  located in
the County of ________________,  State of ____________(the "Real Property"),  as
more  particularly  described  on Exhibit "A" attached  hereto and  incorporated
herein by reference;

         WHEREAS,  Buyer and Seller have entered into that certain  Purchase and
Sale Agreement and Joint Escrow Instructions (the "Purchase  Agreement"),  dated
as of ___________, 1998, with respect to, among other things, the acquisition of
the "Personal  Property" and the "Intangible  Property" (each as defined below),
and certain other property; and

         WHEREAS,  the  Purchase  Agreement  requires  Seller to  convey  all of
Seller's  right,  title and interest in, to and under the Personal  Property and
the Intangible Property to Buyer.

         NOW, THEREFORE,  for good and valuable  consideration,  the receipt and
sufficiency of which are hereby acknowledged, Seller hereby agrees as follows:

         1. Unless the context  otherwise  requires,  all capitalized terms used
but not otherwise  defined  herein shall have the respective  meanings  provided
therefor in the Purchase Agreement.

         2. Seller  does hereby  unconditionally,  absolutely,  and  irrevocably
grant, bargain,  sell, transfer,  assign convey, set over and deliver unto Buyer
all of Seller's right, title and interest in and to:

                  a. all tangible  personal  property now or hereafter  owned by
Seller and located on or about the Land or Improvements  or attached  thereto or
used in  connection  with the use,  operation,  maintenance  or  repair  thereof
(collectively,  the "Personal  Property"),  including,  without limitation,  the
personal  property  described  on Exhibit B-1  attached  hereto,  but  expressly
excluding the personal property described on Exhibit B-2 attached hereto; and

                                       53

<PAGE>


                  b. all  intangible  property now or hereafter  owned by Seller
and used in connection with the Land, the Improvements or the Personal Property,
including,  without limitation,  the Service Contracts  identified on Schedule 1
attached hereto (the "Assumed Service Contracts"), building trademarks and trade
names, transferable business licenses, permits, applications, authorizations and
other  entitlements,  transferable  guarantees and warranties  covering the Land
and/or Improvements, all contract rights, books, records, reports, test results,
environmental assessments, and other similar documents and materials relating to
the use or operation,  maintenance or repair of the Property or the construction
or fabrication thereof, and all transferable utility contracts, but specifically
excluding  any  intangible  property  exclusively  related to the  operation  of
Seller's business  (collectively,  the "Intangible  Property" and, together with
the Personal Property, the "Property").

         3. Buyer  hereby  expressly  assumes,  for  itself and its  successors,
assigns and legal representatives,  the Assumed Service Contracts and all of the
obligations and liabilities, fixed and contingent, of Seller thereunder accruing
from and after the date hereof with  respect  thereto and agrees to (a) be fully
bound  by all of  the  terms,  covenants,  agreements,  provisions,  conditions,
obligations  and  liability  of Seller  thereunder,  which  accrue from the date
hereof,  and (b) keep,  perform and observe all of the covenants and  conditions
contained therein on the part of Seller to be kept, performed and observed, from
and after the date hereof.

         4. Seller  represents  and  warrants  that its title to the Property is
free and clear of all  liens,  mortgages,  pledges,  security  interests,  prior
assignments,  encumbrances  and  claims of any nature  other than the  Permitted
Exceptions.

         5. Seller hereby agrees to  indemnify,  protect,  defend and hold Buyer
harmless  from and  against  any and all  claims,  losses,  damages,  costs  and
expenses  (including,   without  limitation,   reasonable  attorney's  fees  and
disbursements) incurred or suffered by Buyer in connection with the Property and
arising prior to the Closing. Buyer hereby agrees to indemnify,  protect, defend
and hold Seller harmless from and against any and all claims,  losses,  damages,
costs and expenses (including,  without limitation,  reasonable  attorney's fees
and  disbursements)  incurred  or  suffered  by  Seller in  connection  with the
Property and arising on or after the Closing.

         6. This Bill of Sale shall be binding  upon and inure to the benefit of
the parties hereto and their respective heirs, legal representatives, successors
and assigns.

         7. This  Bill of Sale and the legal  relations  of the  parties  hereto
shall be governed by and construed  and enforced in accordance  with the laws of
the State of California, without regard to its principles of conflicts of law.

         IN WITNESS  WHEREOF,  this Bill of Sale was made and executed as of the

                                       54

<PAGE>


date first above written.

                                            SELLER:

                                            _________________________________, a
                                            _________________________________

                                            By:______________________________

                                            Its:_____________________________

                                       55

<PAGE>


                                   Exhibit "I"

                              ESTOPPEL CERTIFICATE

         THIS TENANT ESTOPPEL CERTIFICATE ("Certificate"), dated as of ________,
19__, is executed by ("Tenant")  in favor of  Alexandria  Real Estate  Equities,
Inc., a Maryland corporation,  together with its nominees, designees and assigns
(collectively, "Buyer").


                                    RECITALS

         A. Buyer and ____________ ("Landlord"),  have entered into that certain
Purchase  and  Sale  Agreement  and  Joint  Escrow  Instructions,  dated  as  of
_________,  19__  (the  "Purchase  Agreement"),  whereby  Buyer  has  agreed  to
purchase,  among other things, the improved real property located in the City of
_________,  County of _________, State of _________, more particularly described
on Exhibit "A" attached to the Purchase Agreement (the "Property").

         B. Tenant and Landlord have entered into that certain Lease  Agreement,
dated  as  of  ___________   (together  with  all   amendments,   modifications,
supplements, guarantees and restatements thereof, the "Lease"), for a portion of
the Property.

         C.  Pursuant  to the Lease,  Tenant has agreed that upon the request of
Landlord,  Tenant would execute and deliver an estoppel  certificate  certifying
the status of the Lease.

         D. In connection  with the Purchase  Agreement,  Landlord has requested
that Tenant execute this Certificate with an understanding  that Buyer will rely
on the representations and agreements below.

         NOW, THEREFORE, Tenant certifies,  warrants, and represents to Buyer as
follows:

         Section 1.  Lease.

         Attached hereto as Exhibit "1" is a true,  correct and complete copy of
the Lease,  including  the  following  amendments,  modifications,  supplements,
guarantees  and  restatements  thereof,  which  together  represent  all  of the
amendments,  modifications,  supplements,  guarantees and restatements  thereof:
________________________________________________________________________________
________________________________________________________________________________
(If  none, please state "None.")

                                       56

<PAGE>


         Section 2.  Leased Premises.

         Pursuant  to the Lease,  Tenant  leases  those  certain  premises  (the
"Leased  Premises")  consisting  of  approximately   _______________  (________)
rentable square feet within the Property, as more particularly  described in the
Lease.  In  addition,  pursuant  to the  terms  of the  Lease,  Tenant  has  the
[non-exclusive]  right to use [_____ parking spaces/the parking area] located on
the Property during the term of the Lease.  [Cross-out the preceding sentence or
portions thereof if inapplicable.]

         Section 3.  Full Force of Lease.

         The Lease has been duly  authorized,  executed and delivered by Tenant,
is in full force and effect has not been  terminated  and  constitutes a legally
valid instrument,  binding and enforceable against Tenant in accordance with its
terms,  subject  only to  applicable  limitations  imposed by laws  relating  to
bankruptcy and creditor's rights.

                  Section 4.  Complete Agreement.

         The Lease  constitutes  the  complete  agreement  between  Landlord and
Tenant for the Leased Premises and the Property, except as modified by the Lease
amendments noted above (if any), has not been modified, altered or amended.

         Section 5.  Acceptance of Leased Premises.

         Tenant has accepted  possession  and is currently  occupying the Leased
Premises.

         Section 6.  Lease Term.

         The  term  of  the  Lease  commenced  on  ______________  and  ends  on
_______________, subject to the following options to extend: ___________________
_______________________________________________.
(If none, please state "None.")

         Section 7.  Purchase Rights.

         Tenant has no option, right of first refusal,  right of first offer, or
other right to acquire or purchase all or any portion of the Leased  Premises or
all or any portion of, or interest in, the Property, except as follows: ________
________________________________________________________________________________
_____________________.
(If none, please state "None.")

         Section 8.  Rights of Tenant.

                                       57

<PAGE>


         Except as expressly stated in this Certificate, Tenant:

         (a)  has no right to renew or extend the term of the Lease;

         (b) has no option  or other  right to  purchase  all or any part of the
Leased Premises or all or any part of the Property;

         (c) has no right, title, or interest in the Leased Premises, other than
as Tenant under the Lease.

         Section 9.  Rent.

         (a)  The   obligation  to  pay  rent  under  the  Lease   commenced  on
___________.  The rent under the Lease is current,  and Tenant is not in default
in the performance of any of its obligations under the Lease.

         (b) Tenant is currently  paying base rent under the Lease in the amount
of ___________________  Dollars ($__________) per month. Tenant has not received
and is not, presently,  entitled to any abatement, refunds, rebates, concessions
or forgiveness of rent or other  charges,  free rent,  partial rent, or credits,
offsets or reductions in rent, except as follows: ______________________________
_______________________________________________.
(If none, please state "None.")

         (c)  Tenant's  estimated  share  of  operating  expenses,  common  area
charges,  insurance,  real estate taxes and administrative and overhead expenses
is  __________  percent  ( %)  and is  currently  being  paid  at  the  rate  of
_____________________ Dollars ($__________) per month, payable to: _____________
_______________________________________________.

         (d) There are no existing  defenses or offsets  against  rent due or to
become due under the terms of the Lease,  and there  presently  is no default or
other  wrongful  act or  omission by Landlord  under the Lease or  otherwise  in
connection with Tenant's occupancy of the Leased Premises,  nor is there a state
of facts  which  with the  passage of time or the giving of notice or both could
ripen into a default on the part of Tenant,  or to the best knowledge of Tenant,
could  ripen into a default on the part of Landlord  under the Lease,  except as
follows: _______________________________________________________________________
_______________________________________________.
(If none, please state "None.")

         Section 10.  Security Deposit.

                                       58

<PAGE>


         The amount of Tenant's  security  deposit  held by  Landlord  under the
Lease is _________________ Dollars ($ __________).

         Section 11.  Prepaid Rent.

         The amount of prepaid  rent,  separate  from the security  deposit,  is
__________________________ Dollars ($___________), covering the period from to .

         Section 12.  Insurance.

         All  insurance,  if any,  required to be maintained by Tenant under the
Lease is presently in effect.

         Section 13.  Pending Actions.

         There is not pending or, to the knowledge of Tenant, threatened against
or contemplated by the Tenant, any petition in bankruptcy,  whether voluntary or
otherwise,  any assignment for the benefit of creditors, or any petition seeking
reorganization or arrangement under the federal  bankruptcy laws or those of any
state.

         Section 14.  Tenant Improvements.

         As of the date of this Certificate,  to the best of Tenant's knowledge,
Landlord has  performed  all  obligations  required of Landlord  pursuant to the
Lease;  no offsets,  counterclaims,  or defenses of Tenant under the Lease exist
against Landlord;  and no events have occurred that, with the passage of time or
the giving of notice,  would constitute a basis for offsets,  counterclaims,  or
defenses against Landlord, except as follows:__________________________________
_______________________________________________________________________________.
(If none, please state "None.")

         Section 15.  Assignments by Landlord.

         Tenant  has  received  no notice of any  assignment,  hypothecation  or
pledge of the Lease or rentals under the Lease by Landlord.

         Section 16.  Assignments by Tenant.

         Tenant has not sublet or assigned  the Leased  Premises or the Lease or
any portion  thereof to any sublessee or assignee.  No one except Tenant and its
employees will occupy the Leased Premises. The address for notices to be sent to
Tenant is as set forth in the Lease.

                                       59

<PAGE>


         Section 17.  Environmental Matters.

         The  operation  and use of the Leased  Premises  does not  involve  the
generation,  treatment, storage, disposal or release into the environment of any
hazardous  materials,  regulated materials and/or solid waste, except those used
in the  ordinary  course  of  operating  a  retail  store or  otherwise  used in
accordance with all applicable laws.

         Section 18.  Succession of Interest.

         Tenant agrees that, in the event Buyer succeeds to interest of Landlord
under the Lease:

         (a)  Buyer  shall not be liable  for any act or  omission  of any prior
landlord (including Landlord);

         (b) Buyer shall not be liable for the return of any security deposit;

         (c)  Buyer  shall  not be bound by any rent or  additional  rent  which
Tenant might have prepaid under the Lease for more than the current month;

         (d) Buyer shall not be bound by any amendments or  modifications of the
Lease made without prior consent of Buyer;

         (e) Buyer shall not be subject to any offsets or defenses  which Tenant
might have against any prior landlord (including Landlord); or

         (f)  Buyer  shall not be  liable  under  the  Lease to  Tenant  for the
performance of Landlord's obligations under the Lease beyond Buyer's interest in
the Property.

         Section 19.  Notice of Default.

         Tenant  agrees to give Buyer a copy of any notice of default  under the
Lease  served  upon  Landlord  at the same  time as such  notice is given to the
Landlord. Tenant further agrees that if Landlord shall fail to cure such default
within the applicable grace period,  if any,  provided in the Lease,  then Buyer
shall have an additional  sixty (60) days within which to cure such default,  or
if such default  cannot be cured  within such sixty (60) day period,  such sixty
(60)  day  period  shall  be  extended  so long as Buyer  has  commenced  and is
diligently pursuing the remedies necessary to cure such default (including,  but
not limited to, commencement of foreclosure proceedings,  if necessary to effect
(such  cure),  in which  event the  Lease  shall not be  terminated  while  such
remedies are being pursued.

         Section 20.  Notification by Tenant.

                                       60

<PAGE>


         From the date of this  Certificate and continuing  until  ____________,
Tenant agrees to immediately notify Buyer, in writing by registered or certified
mail, return receipt requested, at the following addresses, on the occurrence of
any  event or the  discovery  of any fact  that  would  make any  representation
contained in this Certificate inaccurate:

         If To Buyer:               Alexandria Real Estate Equities, Inc.
                                    135 N. Los Robles Avenue, Suite 250
                                    Pasadena, California 91101
                                    Attention:  Corporate Secretary

         With A Copy To:            Skadden, Arps, Slate, Meagher & Flom
                                    300 South Grand Avenue, Suite 3400
                                    Los Angeles, California 90071
                                    Attention: George M. Eshaghian

         Tenant makes this Certificate with the knowledge that it will be relied
upon by Buyer in agreeing to purchase the Property.

         Tenant has executed this Certificate as of the date first written above
by the person named below, who is duly authorized to do so.

                                    TENANT

                                     ___________________________________________


                                    By:     _______________________________
                                            Name:
                                            Its:

                                       61

<PAGE>


                                  Exhibit "J-1"

                              NONFOREIGN AFFIDAVIT

                  1.  Section  1445 of the  Internal  Revenue  Code of 1986,  as
amended (the "IRC"), provides that a transferee of a United States real property
interest must withhold tax if the transferor is a foreign person.

                  2. In order to inform Alexandria Real Estate Equities, Inc., a
Maryland corporation, and its nominees, designees and assigns (collectively, the
"Transferee"),  that  withholding of tax is not required upon the disposition by
___________________ (the "Transferor"),  of the United States real property more
particularly described on Exhibit "A" attached hereto and incorporated herein by
reference (the "Property"), the undersigned Transferor certifies and declares by
means of this certification, the following:

                  a.       The  Transferor  is  not a  foreign  person,  foreign
                           corporation,  foreign  partnership,  foreign trust or
                           foreign  estate (as such terms are defined in the IRC
                           and the Income Tax Regulations).

                  b.       Transferor's federal taxpayer  identification  number
                           is:

                           ______________________________.

                  c.       Transferor's address is:

                           _____________________________________________________
                           _____________________________________________________
                           _____________________________________________________

                  3.  Transferor  understands  that  this  certification  may be
disclosed  to the  Internal  Revenue  Service by  Transferee  and that any false
statement contained in this certification may be punished by fine,  imprisonment
or both.

                                       62

<PAGE>


                  Under  penalties of perjury,  Transferor  declares that it has
carefully examined this certification and it is true, correct and complete.

         Executed this __ day of ________, 19__ at .


                                     TRANSFEROR

                                     ___________________________________________


                                    By:     _______________________________
                                            Name:
                                            Its:

                                       63

<PAGE>


                                  Exhibit "J-2"

                                    FORM 590

                                    Attached.

                                       64

<PAGE>


                                   Exhibit "K"

                                      LEASE

                                    Attached

                                       65

<PAGE>


                                  Exhibit "K-1"

                                LEASE TERM SHEET


Lessor:                   Alexandria Real Estate Equities, Inc. or its assignee

Lessee:                   Matrix Pharmaceuticals, Inc.

Rentable Square Footage:  67,050 square feet (approximately)

Initial Base Rent:        $1,920,000  per  year,  payable  in  advance  in equal
                          monthly installments

Escalation of Base Rent:  The  Base  Rent  shall  increase  on the  fifth  (5th)
                          anniversary  of  the  Lease  Commencement  Date  by an
                          amount  equal  to  the  cumulative   increase  in  the
                          Consumer  Price  Index  for  San  Diego   metropolitan
                          statistical  area ("Index") for the previous fifth (5)
                          years  but not less  than 2% and not more  than 4% for
                          any  given  year  during  the  initial  five  (5) year
                          period.  Thereafter,  the Base Rent, including renewal
                          periods,  shall  increase  every three (3) years by an
                          amount equal to the cumulative  increases in the Index
                          for the previous three (3) years, but not less than 2%
                          and not more than 4% for any  given  year  during  the
                          three year period.

Security Deposit:         $2,580,000  to be deposited  with Lessor in cash or an
                          acceptable  letter  of  credit  in a form  and  with a
                          financial  institution  normally  acceptable to Lessee
                          and Lessor ("Letter of Credit").

                          Percentage Reduction Amount       Mileage Event
                          ---------------------------       -------------
                          25%                               Lessee    to    have
                                                            completed  strategic
                                                            alliances  or  joint
                                                            ventures    with   a
                                                            cumulative  value in
                                                            excess     of    $10
                                                            million (value equal
                                                            to up front payments
                                                            plus       milestone
                                                            payments).

                          25%                               Lessee     corporate
                                                            sales from  products
                                                            exceed $10 million.


Initial Lease Term:       13 years

                                       66

<PAGE>


Options to Extend:        Upon at  least  one  year's  prior  notice,  five  (5)
                          consecutive  five (5) year  options to extend the term
                          at a mutually acceptable rent on the commencement date
                          of each such renewal term.

Late Charges:             3% of the amount delinquent, if any amount is not paid
                          within 10 days from the date notice of  delinquency is
                          given to Lessee.

Expenses:                 Absolute  net:  Lessee  shall be  responsible  for the
                          entire cost of maintaining and improving the Property,
                          which   shall   include,   without   limitation,   all
                          maintenance,    upkeep,    cleaning,    repairs,   and
                          replacements  of all  improvements  at  the  Property,
                          structural, and non-structural,  all real and personal
                          property taxes,  assessments  and bonds  pertaining to
                          the   Property,   public   Liability,   environmental,
                          earthquake and property damage insurance premiums, all
                          utilities and related  services  rendered or furnished
                          to the Property  such as  electricity,  water,  sewer,
                          heat, air, telephone,  refuse and gas, and all related
                          charges and deposits, and costs of any tenant or other
                          capital  improvements to the Property,  as well as the
                          cost of property  management  which shall equal $2,000
                          per month.

Subleases:                Lessee shall  execute a present  assignment  of leases
                          and rents to Lessor  whereby  Lessee shall continue as
                          the Lessor ("Master Lessor") under the existing leases
                          to  Advanced  Tissue  Sciences,  Inc.  and  lessees of
                          rooftop space for antenna purposes (collectively,  the
                          "Subleases").  The Subleases  shall be subordinated to
                          Lessor's  interest in the Property and the  sublessees
                          shall  attorn to  Lessor.  Upon any  default by Lessee
                          under the Lease  such  Subleases  shall  make all rent
                          payments directly to Lessor.

Repurchase Rights:        Option (A). Right of First Offer. Provided that Lessee
                          is not then in default  under the Lease,  in the event
                          Lessor   determines   that  it  intends  to  sell  the
                          Property, it shall give Lessee at least 10 days' prior
                          written  notice  of such  intent  ("Lessor's  Notice")
                          prior to  actively  marketing  the  Property  to third
                          parties,  and Lessee may elect, by delivery of written
                          notice to Lessor  ("Lessee's  Notice")  within 10 days
                          after receipt of Lessor's Notice, to negotiate for the
                          acquisition of the Property.  If Lessee so elects, the
                          parties shall meet and negotiate in good faith for the
                          purchase  and sale of the  Property for a period of 30
                          days  following  delivery of Lessor's  Notice.  In the
                          event that  Lessor and Lessee are unable to agree upon
                          the terms of the sale  within said 30 day period or in
                          the  event  that  Lessee  does  not  deliver  Lessee's
                          Notice,  then Lessor  shall be entitled to  thereafter
                          sell  the  Property  to

                                       67

<PAGE>


                          any  third  party  purchaser,  provided  that any such
                          purchaser  shall  acquire  the  Property   subject  to
                          Lessee's right of first offer.

                          (B).  Certain  Terms of Sale.  Any  purchase  and sale
                          pursuant  to  Lessee's  right of first  offer shall be
                          handled  by Holder.  The  transaction  shall  close no
                          sooner  than nine (9) and no later  than  twelve  (12)
                          months after Lessee's written notification of election
                          to  exercise  right of first  offer  unless  otherwise
                          mutually  agreed in writing.  The right of first offer
                          shall  terminate  at the end of the Lease term and any
                          extensions.

Indemnification:          Lessee to provide  Lessor with full  indemnifications,
                          including  without  limitations   indemnification  for
                          damages  suffered  by  reason of  hazardous  materials
                          utilized by Lessee.

                                       68

<PAGE>


                                   Exhibit "L"

                                 LOAN TERM SHEET


Lender:                   Alexandria Real Estate Equities, Inc. or its assigns.

Borrower:                 Matrix Pharmaceuticals, Inc.

Loan Amount:              $6,000,000

Interest Rate:            11%

Payment Terms:            Interest  only  payable in  advance  in equal  monthly
                          installments ($660,000 per annum).

Term:                     4 years

Conversion Event:         The loan shall be reduced in $3,000,000 increments and
                          shall convert into lease payments upon  achievement of
                          the following milestone events.

                          1.   Borrower to have completed strategic alliances or
                               joint ventures with a cumulative  value in excess
                               of $10 million  (value equal to up front payments
                               plus milestone payments);

                          2a.  Borrower corporate sales from products exceed $10
                               million; or

                          2b.  Borrower to have completed strategic alliances or
                               joint ventures with cumulative value in excess of
                               $15 million.
                          ______________________________________________________

Conversion Lease Terms for each $3,000,000 reduction increment:

     Initial Base Rent:   $330,000 per year, payable in advance in equal monthly
                          installments,  subject to escalation on the same terms
                          and time periods as provided in the Lease.

     Other Lease Terms:   All other terms and conditions of Lease apply.

Default:                  A default  under the loan shall be a default under the
                          Lease.

Security:                 Borrower's manufacturing related building improvements
                          and fixtures.

                                       69

<PAGE>


                                   Exhibit "M"

                                  TENANT LEASES

                                    Attached

                                       70

<PAGE>


                                   Exhibit "N"

                                SERVICE CONTRACTS

                                    Attached

                                       71

<PAGE>


                                   Exhibit "O"

                                    EMPLOYEES

                                      None.

                                       72

<PAGE>


                                   Exhibit "P"

                                    APPROVALS

                                    Attached.

                                       73



                                      LEASE


                                 BY AND BETWEEN


                           ARE-4757 NEXUS CENTRE, LLC

                                   as Landlord

                                       and

                           MATRIX PHARMACEUTICAL, INC.

                                    as Tenant


<PAGE>




                                      LEASE


         THIS  LEASE is made as of March 25,  1998  ("Effective  Date"),  by and
between  ARE-4757  NEXUS  CENTRE,  LLC, a  Delaware  limited  liability  company
("Landlord") and MATRIX PHARMACEUTICAL, INC., a Delaware corporation ("Tenant").

1.       Lease of Premises

         Landlord hereby leases to Tenant and Tenant hereby leases from Landlord
upon the terms and  conditions  hereof,  those  certain  premises  (the "Demised
Premises")  located on the land legally described on Exhibit "A" attached hereto
(the "Land") and commonly known as the building located at the address set forth
below in  Section  2.1.1  (the  "Building").  The real  property  upon which the
Building  is  located  and  all  landscaping,   parking   facilities  and  other
improvements and  appurtenances  related thereto,  are hereinafter  collectively
referred to as the "Project",  the site plan and legal  description for which is
attached  hereto  as  Exhibit  "B".  All  portions  of the  Project  which  in a
multi-tenant  complex  would  be for the  non-exclusive  use of  tenants  of the
Building,  including, without limitation,  driveways,  sidewalks, parking areas,
landscaped areas, service corridors,  stairways, elevators, public restrooms and
Building lobbies, are hereinafter referred to as "Common Area".

2.       Basic Lease Provisions

         2.1. For convenience of the parties,  certain basic  provisions of this
Lease are set forth herein.  The  provisions set forth herein are subject to the
remaining  terms and conditions of this Lease and are to be interpreted in light
of such remaining terms and conditions.

                  2.1.1      Address of the Building:

                             4757 Nexus Centre Drive
                             San Diego, California

                  2.1.2      [Intentionally omitted.]

                  2.1.3      (a) Rentable Area of Demised  Premises:  67,050 sq.
                                 ft.

                             (b)  Rentable Area of Building:  67,050 sq. ft.

                  2.1.4      Initial Basic Annual Rent: $1,920,000

                  2.1.5      Initial Monthly Rental Installments of Basic Annual
                             Rent: $160,000

                  2.1.6      Tenant's Pro Rata Share: 100 % of the Building, and
                             100% of the Project

                                       1
<PAGE>

                  2.1.7      (a) Term  Commencement  Date: As defined in Section
                                 4.2 hereof.

                             (b) Term  Expiration  Date:  The  last  day  of the
                                 calendar   month   in  which   the   thirteenth
                                 anniversary  of  the  Term   Commencement  Date
                                 occurs,   subject  to   extension   or  earlier
                                 termination as provided herein.

                  2.1.8      Security  Deposit:  $2,580,000,  to be deposited in
                             accordance   with  and  subject  to  increase   and
                             decrease in accordance with Section 9 hereof.

                  2.1.9      Permitted Use: Scientific research laboratories and
                             related manufacturing, distribution and office uses
                             and incidental storage uses consistent with Section
                             10 hereof.

                  2.1.10     Address for Rent Payment:

                             135 North Los Robles Avenue, Suite 250
                             Pasadena, CA 91101
                             Attention:  Corporate Secretary

                             Address for Notices to Landlord:

                             135 North Los Robles Avenue, Suite 250
                             Pasadena, CA 91101
                             Attention: Corporate Secretary

                             With a copy to:

                             11440 West Bernardo Court, Suite 170
                             San Diego, CA 92127
                             Attention: Gary A. Kreitzer, Esq.

                  2.1.11     Address for Notices to Tenant:

                             34700 Campus Drive
                             Fremont, California 94555
                             Attention:  Mr. James R. Glynn

                                       2
<PAGE>




3.       Term

         3.1. This Lease shall take effect upon the Effective  Date and,  except
as  specifically  otherwise  provide  within this Lease,  each of the provisions
hereof  shall be binding  upon and inure to the benefit of Landlord  and Tenant,
and  each of  their  respective  successors  and  permitted  assigns,  from  the
Effective Date.

         3.2.  The term of this Lease (the  "Term") will be that period from the
Term  Commencement  Date as  defined  in  Section  4.2  below  through  the Term
Expiration Date, as such may be terminated or extended as provided herein.

4.       Possession and Commencement Date

         4.1. Landlord shall tender possession of the Demised Premises to Tenant
on the Effective Date.

         4.2.     The "Term Commencement Date" shall be the Effective Date.

         4.3.     [Intentionally omitted.]

         4.4.  Access to and  non-exclusive  possession  of areas  necessary for
utilities,  services,  safety and  operation  of the Building and the Project is
reserved to Landlord.

5.       Rent

         5.1. Tenant agrees,  commencing on the Term  Commencement  Date, to pay
Landlord  as Basic  Annual Rent for the  Demised  Premises  the sum set forth in
Section  2.1.4  subject to the rental  increases  provided  in Section 6 hereof.
Basic Annual Rent shall be paid in the equal monthly  installments  set forth in
Section  2.1.5,  subject to the rental  increases  provided in Section 6 hereof,
each in advance  on the first day of each and every  calendar  month  during the
Term.

         5.2. In addition to Basic Annual Rent, Tenant agrees to pay to Landlord
as additional rent ("Additional  Rent") at times  hereinafter  specified in this
Lease (i) Tenant's pro rata share, as set forth in Section 2.1.6  ("Tenant's Pro
Rata Share") of  Operating  Expenses as provided in Section 7 and (ii) any other
amounts that Tenant  assumes or agrees to pay under the provisions of this Lease
that are owed to Landlord, including, without limitation, any and all other sums
that may  become due by reason of any  default of Tenant or failure on  Tenant's
part to comply with the  agreements,  terms,  covenants  and  conditions of this
Lease to be  performed  by Tenant,  after  notice and lapse of  applicable  cure
period.

         5.3.  Basic  Annual  Rent  and   Additional   Rent  shall  together  be
denominated  "Rent".  Rent  shall  be  paid  to  Landlord,   without  abatement,
deduction,  or offset,  in lawful money of the United States of America,  at the
office of Landlord as set forth in Section  2.1.10 or to such other

                                       3
<PAGE>

person or at such other place as Landlord may from time designate in writing. In
the event  the Term  commences  or ends on a day  other  than the first day of a
calendar month, then the Rent for such fraction of a month shall be prorated for
such  period  on the  basis of a thirty  (30) day month and shall be paid at the
then current rate for such fractional month.

6.       Rent Adjustments

         6.1. Basic Annual Rent shall be adjusted on the fifth (5th) anniversary
of the Term Commencement Date, and on such date every three (3) years thereafter
during the Term (each, a "Rent  Adjustment  Date") in proportion to increases in
the  Consumer  Price Index (as  hereinafter  defined)  as  provided  within this
Section 6. The each such  adjustment  shall become  effective  commencing on the
Rent Adjustment Date. Basic Annual Rent shall be adjusted upward as follows:

         6.2. The Basic Annual Rent shall be adjusted upward as follows:

                  6.2.1 For  purposes of each Rent  Adjustment  Date,  the "Base
Month" shall be that month which is three (3) months prior to the month in which
the previous Rent  Adjustment  Date occurred,  or, in the case of the first Rent
Adjustment  Date, the Term  Commencement  Date. The "Comparison  Month" shall be
that  month  which is three  (3)  months  prior to the  month in which  the Rent
Adjustment Date occurs.

                  6.2.2 As used in this  Section  6, the  term  "Consumer  Price
Index"  means the  Consumer  Price  Index (all  items) for all wage  earners and
clerical workers in the Los Angeles/Riverside  metropolitan area (1982-84 = 100)
as  published  by the  United  States  Department  of  Labor,  Bureau  of  Labor
Statistics.  If the  1982-84  base of the  Consumer  Price  Index  is  hereafter
changed, then the new base will be converted to the 1982-84 base and the base as
so converted  shall be used.  In the event that the Bureau ceases to publish the
Consumer Price Index at lease once every other month, then the successor or most
nearly comparable index thereto reasonably selected by Landlord shall be used.

                  6.2.3 In the  event  that the  Consumer  Price  Index  for the
Comparison  Month exceeds the Consumer Price Index for the Base Month, the Basic
Annual  Rent then  payable (as  increased  by  previous  adjustments  under this
Section 6) shall be  multiplied  by a fraction,  the  numerator  of which is the
Consumer Price Index figure for the  Comparison  Month,  and the  denominator of
which is the  Consumer  Price Index  figure for the Base  Month.  Such amount as
calculated  shall be the  Basic  Annual  Rent to be paid  until  the  next  Rent
Adjustment Date.

                  6.2.4 Notwithstanding the foregoing,  on every Rent Adjustment
Date Basic  Annual  Rent shall  increase  on  account of any such  adjustment  a
minimum of the  aggregate  of two percent (2%) of the Basic Annual Rent per year
for each year during the period since the previous  Rent  Adjustment  Date,  and
shall not  increase  more than the  aggregate  of four percent (4%) of the Basic
Annual Rent per year for each year  during the period  since the  previous  Rent

                                       4
<PAGE>

Adjustment Date.

7.       Operating Expenses

         7.1. As used herein, the term "Operating Expenses" shall include:

                  7.1.1 Government  impositions  including,  without limitation,
property  tax  costs  consisting  of  real  and  personal   property  taxes  and
assessments  (including amounts due under any improvement bond upon the Building
or the Project,  including the parcel or parcels of real property upon which the
Building  or the  Project are  located or  assessments  levied in lieu  thereof)
imposed by any governmental authority or agency; any tax on or measured by gross
rentals  received from the rental of space in the Building,  or tax based on the
square footage of the Demised  Premises,  the Building or the Project as well as
any parking charges,  utilities surcharges,  or any other costs levied, assessed
or  imposed  by,  or  at  the  direction  of,  or  resulting  from  statutes  or
regulations,  or  interpretations  thereof,  promulgated by any federal,  state,
regional,  municipal or local government authority in connection with the use or
occupancy  of the  Building  or the  parking  facilities  serving  the  Building
including  those  located  on any  adjacent  parcel  to the  extent  used  by or
benefitting the Demised Premises; any tax on this transaction or any document to
which  Tenant is a party  creating  or  transferring  an interest in the Demised
Premises;  any fee for a business license to operate an office building; and any
expenses,  including  the  reasonable  cost of attorneys or experts,  reasonably
incurred  by  Landlord  in  seeking  reduction  by the taxing  authority  of the
applicable  taxes,  less tax refunds  obtained as a result of an application for
review  thereof.  Operating  Expenses  shall  not  include  (i) any  net  income
franchise,  capital stock, estate or inheritance taxes, (ii) taxes which are the
personal  obligation  of Tenant or of another  tenant of the Project,  (iii) any
government  impositions arising from any legal parcel of the Project adjacent to
the Land whether or not owned by Landlord,  and any improvements thereto, to the
extent not used by or benefitting the Demised  Premises,  (iv) any environmental
assessment, charges or liens arising in connection with remediation of Hazardous
Materials from the Project which are caused by Landlord to be brought upon, kept
or used in or about the  Demised  Premises,  the  Building or the  Project,  (v)
reserves for future taxes and  assessments in excess of the installment of taxes
and assessments next coming due, or any documentary  transfer taxes arising from
a voluntary  transfer of the Project or any portion  thereof by  Landlord.  If a
reduction in real property  taxes or assessments is obtained for any year of the
Term during  which Tenant paid  Tenant's  Pro Rata Share of Operating  Expenses,
then  Operating  Expenses  for such year shall be  retroactively  adjusted,  and
Landlord  shall  provide  Tenant  with  a  credit  against   Tenant's  next  due
obligations  for Rent in the amount of such reduction (or, if none,  refund such
amount to Tenant within  ninety (90) days of such  reduction).  Landlord  hereby
agrees  to  contest  increases  in the tax rate and  assessed  valuation  of the
Project,  which  affect the  general  real  estate tax  component  of  Operating
Expenses or any other increase in taxes customarily  protested by prudent owners
of commercial office buildings in the City of San Diego in a manner  appropriate
for such an owner if requested by Tenant and provided that Tenant shall bear all
cost and expense in  connection  with such contest.  If, by applicable  law, any
taxes or assessments  may be paid in installments at the option of the taxpayer,
then  whether  or  not  

                                       5
<PAGE>

Landlord elects to pay taxes and assessments in installments, Tenant's liability
for such taxes and  assessments  shall be computed as if such  election had been
made, and only the installments  thereof and any interest or fee payable thereon
which would have  become due during the Term shall be  included in Tenant's  Pro
Rata Share of Operating Expenses.

                  7.1.2 All other costs of any kind paid or incurred by Landlord
and  not  otherwise  paid  by  Tenant  in  connection  with  the  operation  and
maintenance  of the Building and the Project  including,  by way of examples and
not as a limitation  upon the generality of the foregoing,  costs of repairs and
replacements  to the  Building or the other  improvements  within the Project as
appropriate to maintain Building or the Project as required hereunder;  costs of
utilities  furnished  to  the  Common  Areas;  sewer  fees;  cable  T.V.;  trash
collection; cleaning, including windows; heating; ventilation; air-conditioning;
maintenance  of landscape and grounds;  maintenance of drives and parking areas;
security  services  and  devices;   building   supplies;   maintenance  for  and
replacement of equipment  utilized for operation and maintenance of the Project:
license,  permit and inspection  fees;  sales, use and excise taxes on goods and
services purchased by Landlord in connection with the operation,  maintenance or
repair of the Project and Building  systems and equipment;  telephone,  postage,
stationary   supplies  and  other  expenses  incurred  in  connection  with  the
operation,  maintenance, or repair of the Project;  accounting,  legal and other
professional fees and expenses incurred in connection with the Project; the cost
of furniture, draperies, carpeting, landscaping and other customary and ordinary
items of personal property provided by Landlord for use in Common Areas; capital
expenditures;  costs of complying  with any applicable  laws or hazardous  waste
remediation rules or regulations;  insurance  premiums,  including  premiums for
public liability,  property  casualty,  earthquake and environmental  coverages;
portions of insured losses paid by Landlord as part of the deductible portion of
such losses by reason of insurance  policy terms;  service  contracts;  costs of
services of independent contractors retained to do work of nature or type herein
referenced;  and costs of compensation  (including  employment  taxes and fringe
benefits) of all persons who perform regular and recurring duties connected with
the  day-to-day  operation and  maintenance of the Project,  its equipment,  the
adjacent walks,  landscaped areas,  drives, and parking areas below the level of
Project  manager,   including  without  limitation,   janitors,   floor  waxers,
window-washers,  watchmen,  gardeners,  sweepers,  and  handymen  and  costs  of
management  services in the amount of $2,000 per month during the Term. The cost
of any  capital  expenditures  by  Landlord  reimbursed  as  Operating  Expenses
pursuant to this Lease shall be amortized on a straight-line basis over a period
equal to the useful life of the item as  determined by reference to the vendor's
or manufacturer's  suggested useful life for such capital improvements or, where
such reference  does not exist,  by reference to generally  accepted  accounting
principals, consistently applied, but not more than seven years.

                  7.1.3 Notwithstanding the foregoing,  Operating Expenses shall
not include any leasing  commissions;  expenses  which relate to  preparation of
rental space for a tenant;  expenses of initial  development  and  construction,
including but not limited to, grading, paving,  landscaping,  and decorating (as
distinguished from maintenance  repair and replacement of the foregoing);  legal
expenses relating to other tenants;  costs of repair to the extent reimbursed by

                                       6
<PAGE>

payment  received by  Landlord of  insurance  proceeds;  interest  upon loans to
Landlord or secured by  mortgages  or deeds of trust  covering  the Project or a
portion thereof (provided  interest upon a government  assessment or improvement
bond payable in installments is an Operating Expense under Section 7.1.1 above);
salaries of executive officers of Landlord; depreciation claimed by Landlord for
tax  purposes  (provided  this  exclusion of  "depreciation"  is not intended to
delete from Operating  Expenses actual costs of repairs and  replacements  which
are  provided  for in  Section  7.1.2  above);  and taxes of the types set forth
within the last sentence of Section 7.1.1 above.  Notwithstanding  any provision
of this Lease to the contrary,  the following shall not be included as Operating
Expenses: (i) any costs incurred solely due to Landlord's violation of any terms
or  conditions  of this  Lease and not  otherwise  caused or  contributed  to by
Tenant;  (ii) damage and repairs  necessitated solely by the gross negligence or
willful misconduct of Landlord or its agents, employees, contractors or invitees
and not  otherwise  caused  or  contributed  to by  Tenant;  (iii)  advertising,
promotional,  and marketing costs,  including leasing commissions and attorneys'
fees in connection with the negotiation and preparation of letters,  deal memos,
letters of intent,  leases or space planning costs with respect to tenants other
than  Tenant;  (iv)  costs,  including  permit,  license and  inspection  costs,
incurred with respect to the  development or construction of any other buildings
of the  Project  not for the  benefit of Tenant,  or the  installation  of other
tenants or other  occupants  in the  Project,  improvements  made to the demised
premises  of other  tenants or other  occupants  in the  Project or  incurred in
designing, constructing, renovating or otherwise improving, decorating, painting
or redecorating vacant space for tenants or other occupants of the Project other
than Tenant;  (v) any costs,  fines, or penalties  incurred due to violations by
Landlord of any governmental rule or authority, this Lease or any other lease in
the Project and not  otherwise  caused or  contributed  to by Tenant,  or due to
Landlord's  gross  negligence or willful  misconduct;  (vi)  Landlord's  general
corporate  overhead and  administrative  expenses (which shall be covered by the
costs of management services);  and (vii) reserves for Operating Expenses (other
than reasonable reserves for taxes,  assessments,  insurance and other recurring
charges which are payable less  frequently  than monthly for payments  which are
next  coming due,  which may be  collected  and held by  Landlord  only upon and
during the  continuance  of a Default).  Landlord  agrees to exercise  care that
there be no  duplication  of  submittals of items of expense for which Tenant is
obligated to pay Landlord under this Lease.

         7.2.  Tenant  shall pay to Landlord  on the first day of each  calendar
month of the Term, as Additional Rent,  Landlord's estimate of Tenant's Pro Rata
Share of Operating Expenses with respect to the Project for such month.

                  7.2.1  Within  ninety (90) days after the  conclusion  of each
calendar  year, (or such longer period as may be reasonably  required)  Landlord
shall  furnish to Tenant a  statement  showing in  reasonable  detail the actual
Operating  Expenses and  Tenant's  Pro Rata Share of Operating  Expenses for the
previous  calendar year. Any additional sum due from Tenant to Landlord shall be
immediately  due and payable.  If the amounts paid by Tenant pursuant to Section
7.2  exceeds  Tenant's  Pro Rata Share of  Operating  Expense  for the  previous
calendar  year,  Landlord  shall,  at Landlord's  option,  either (i) credit the
excess amount to the next succeeding  installments of estimated Additional Rent,
or (ii) pay the excess to Tenant within 

                                       7
<PAGE>

thirty  (30) days after  delivery of such  statements;  provided,  however,  any
excess owing to Tenant after the  expiration of the term shall be paid to Tenant
within thirty (30) days after delivery of such statements.

                  7.2.2 Any amount due under Section 7.2 for any period which is
less than a full month shall be prorated  (based on a thirty (30) day month) for
such fractional month.

         7.3. Landlord's annual statement shall be final and binding upon Tenant
unless  Tenant,  within one hundred  twenty  (120) days after  Tenant's  receipt
thereof,  shall contest any item therein by giving  written  notice to Landlord,
specifying  each item  contested  and the reason  therefor.  If, during such one
hundred twenty (120) day period,  Tenant  reasonably and in good faith questions
or contests the  correctness of Landlord's  statement of Tenant's Pro Rata Share
of Operating  Expenses,  Landlord will provide  Tenant with access to Landlord's
books and records and such information as Landlord  reasonably  determines to be
responsive to Tenant' questions. In the event that after Tenant's review of such
information,  Landlord  and Tenant  cannot agree upon the amount of Tenant's Pro
Rata Share of  Operating  Expenses,  then Tenant shall have the right to have an
independent  public  accounting firm selected from among the ten (10) largest in
the United States hired by Tenant (at Tenant's  sole cost and expense  except as
hereinafter  provided)  and approved by Landlord  (which  approval  shall not be
unreasonably  withheld or delayed) audit and/or review such Landlord's books and
records for the year in question (the "Independent  Review"). The results of any
such  Independent  Review  shall be  binding  on  Landlord  and  Tenant.  If the
Independent  Review shows that  Tenant's  Pro Rata Share of  Operating  Expenses
actually paid for the calendar year in question  exceeded  Tenant's  obligations
for such calendar year,  Landlord  shall at Landlord's  option either (1) credit
the excess amount to the next succeeding  installments  of estimated  Additional
Rent or (2) pay the excess to Tenant within  thirty (30) days after  delivery of
such statement and if such Independent  Review determines that Tenant's Pro Rata
Share of  Operating  Expenses  actually  paid for such  year  exceeded  Tenant's
obligations  for such  calendar  year by the greater of 5% and $5,000,  Landlord
shall pay the reasonable  cost of such  Independent  Review.  If the Independent
Review  shows that  Tenant's  payments of Tenant's  Pro Rata Share of  Operating
Expenses  for such  calendar  year were less than  Tenant's  obligation  for the
calendar  year,  Tenant shall pay the  deficiency to the Landlord  within thirty
(30) days after delivery of such statement.

         7.4.   Tenant  shall  not  be   responsible   for  Operating   Expenses
attributable  to the  time  period  prior  to the Term  Commencement  Date.  The
responsibility of Tenant for Tenant's Pro Rata Share of Operating Expenses shall
continue to the latest of (i) the Term  Expiration  Date or (ii) the date Tenant
has fully  vacated the Demised  Premises  (including,  without  limitation,  the
removal of all items  required  hereby to be removed and the  completion  of all
procedures  necessary  to fully  release and  terminate  any permits or licenses
restricting  the  use of the  Demised  Premises  in any  manner),  or  (iii)  if
termination  of the Lease is due to the  default of  Tenant,  the date of rental
commencement of a replacement tenant.

         7.5.  Operating  Expenses  for  the  calendar  year in  which  Tenant's
obligation  to share  

                                       8

<PAGE>

therein  commences  and in the calendar  year in which such  obligation  ceases,
shall be prorated on a basis reasonably determined by Landlord. Expenses such as
taxes,  assessments  and insurance  premiums  which are incurred for an extended
time period  shall be prorated  based upon time periods to which  applicable  so
that the amounts  attributed  to the  Demised  Premises  relate in a  reasonable
manner to the time period wherein Tenant has an obligation to share in Operating
Expenses.  In the event that any Operating Expenses are allocable to portions of
the  Project  other  than the  Demised  Premises  and the Land,  Landlord  shall
allocate such Operating  Expenses based upon the ratio of the maximum  buildable
area of the Land compared to the maximum  buildable area of all land  comprising
the Project.

         7.6.     [Intentionally omitted.]

         7.7.     [Intentionally omitted.].

8.       [Intentionally omitted.]

9.       Security Deposit

         9.1.  Tenant has  deposited  with Landlord the sum set forth in Section
2.1.8 (the  "Security  Deposit")  in cash or a Letter of Credit (as  hereinafter
defined) or any  combination  thereof,  which Security  Deposit shall be held by
Landlord  as  security  for  the  performance  by  Tenant  of all of the  terms,
covenants,  and  conditions  of this  Lease to be kept and  performed  by Tenant
during the Term (including, without limitation,  Tenant's obligations to repair,
maintain and improve the Demised  Premises).  If Tenant defaults with respect to
any  provision  of this Lease,  including,  but not  limited  to, any  provision
relating to the payment of Rent or the repair, maintenance or improvement of the
Demised  Premises,  Landlord  may (but shall not be required  to) use,  apply or
retain all or any part of the  Security  Deposit  for the payment of any Rent or
any other sum in default,  to repair,  maintain and improve the Demised Premises
or to compensate Landlord for any other loss or damage which Landlord may suffer
by reason of Tenant's default. If any portion of the Security Deposit is so used
or applied, Tenant shall, upon demand therefor,  restore the Security Deposit to
its original amount, and Tenant's failure to do so shall be a material breach of
this Lease.  Landlord shall keep the Security  Deposit separate from its general
fund, and Tenant shall be entitled to annual payments of interest on any portion
of the Security  Deposit held by Landlord as cash,  at such rate as Landlord may
receive thereon.

         9.2. In lieu of depositing cash as the Security  Deposit,  Tenant shall
have the right, but not the obligation, to deliver to Landlord an unconditional,
irrevocable standby letter of credit in the amount of $2,580,000 (the "Letter of
Credit"), which Letter of Credit shall (i) be in a form reasonably acceptable to
Landlord,  (ii) be issued by Imperial Bank, or such other financial  institution
selected  by Tenant and  reasonably  acceptable  to  Landlord,  (iii) be for the
benefit of  Landlord,  but shall be  assignable  by Landlord  to any  subsequent
purchaser or encumbrancer of the Building or the Project,  (iv) be automatically
renewable  from year to year  throughout the Term, (v) be payable by draft sight
in San Diego,  California,  upon  presentation of a  certification  


                                       9
<PAGE>

signed by an officer of Landlord which states that a default under the Lease has
occurred and has not been cured within any applicable  cure period,  and (vi) be
payable in the event such  Letter of Credit is not renewed on or before the date
which is thirty (30) days prior to its expiration.

         9.3. In the event of  bankruptcy or other  debtor-creditor  proceedings
against Tenant,  the Security Deposit shall be deemed to be applied first to the
payment of Rent and other  charges due  Landlord  for all  periods  prior to the
filing of such proceedings.

         9.4. Landlord shall deliver the unapplied and unrefunded portion of the
Security Deposit to any purchaser of Landlord's interest in the Demised Premises
and thereupon  Landlord  shall be  discharged  from any further  liability  with
respect  to the  Security  Deposit.  This  provision  shall  also  apply  to any
subsequent transfers.

         9.5.  If Tenant  shall not then be in  default  under this  Lease,  the
Security  Deposit,  or any balance thereof,  shall be returned to Tenant (or, at
Landlord's  option, to the last assignee of Tenant's interest  hereunder) within
sixty (60) days after the expiration or earlier termination of this Lease.

         9.6.     [Intentionally omitted.]

         9.7.  Upon  delivery of written  evidence  reasonably  satisfactory  to
Landlord that Tenant has completed  strategic alliances or joint ventures with a
cumulative value in excess of $10,000,000,  as measured by initial and milestone
payments  received  by  Tenant  from  unaffiliated  joint  venture  or  alliance
partners,  and  provided  that no Default,  or event  which,  with the giving of
notice or the passage of time, or both, would constitute a Default, has occurred
and is  continuing,  the Security  Deposit  shall be  decreased  by  twenty-five
percent (25%) of the amount then held by Landlord (the "Reduction Amount"),  and
(i)  Landlord  shall  return to Tenant the  Reduction  Amount,  if the  Security
Deposit is held in cash,  within ten (10) days of  receipt by  Landlord  of such
written evidence,  or (ii) Landlord shall permit Tenant to deliver a replacement
letter of credit in the amount of the  Security  Deposit  then held by  Landlord
less the Reduction Amount,  which  replacement  letter of credit shall otherwise
comply with the terms of Section 9.2,  and  Landlord  shall return to Tenant the
Letter of Credit  upon  receipt  of the  replacement  letter,  at which time the
replacement letter of credit shall become the Letter of Credit.

         9.8. If,  subsequent to any reduction in the Security  Deposit pursuant
to Section 9.7,  Landlord receives written evidence  reasonably  satisfactory to
Landlord  that Tenant's net sales from  products for the  immediately  preceding
fiscal year (as  reported  in  Tenant's  most  recent  public  filings  with the
Securities and Exchange Commission) were no less than $10,000,000,  and provided
that no  Default,  or event  which,  with the giving of notice or the passage of
time, or both, would constitute a Default,  has occurred and is continuing,  the
Security  Deposit shall be decreased by twenty-five  percent (25%) of the amount
then held by Landlord  (the  "Additional  Reduction  Amount"),  and (i) Landlord
shall return to Tenant the Additional  Reduction Amount, if the Security Deposit
is held in cash,  within ten (10) days of receipt by  Landlord  of such  written

                                       10
<PAGE>

evidence,  or (ii) Landlord shall permit Tenant to deliver a replacement  letter
of credit in the amount of the Security  Deposit then held by Landlord  less the
Additional  Reduction Amount, which replacement letter of credit shall otherwise
comply with the terms of Section 9.2,  and  Landlord  shall return to Tenant the
letter of credit then held by Landlord upon receipt of the  replacement  letter,
at which  time the  replacement  letter of credit  shall  become  the  Letter of
Credit.

10.      Use

         10.1.  Tenant shall use the Demised  Premises for the purpose set forth
in Section 2.1.9 and shall not use the Demised Premises, or permit or suffer the
Demised  Premises to be used,  for any other  purpose  without the prior written
consent  of  Landlord  which may be  withheld  in  Landlord's  sole  discretion;
provided,  however,  that Landlord consents to the Antenna Lease (as hereinafter
defined) to the same extent as in effect as of the Effective Date.

         10.2.  Tenant shall not use or occupy the Demised Premises in violation
of any federal, state and local laws and regulations,  zoning ordinances,  or of
the  certificate of occupancy  issued for the Building,  and shall,  upon thirty
(30) days' written notice from Landlord,  or, if required by law or if resulting
in a threat to human health or safety,  then within five (5) days written notice
or as required by law,  discontinue  any use of the  Demised  Premises  which is
declared or claimed by any governmental  authority  having  jurisdiction to be a
violation  of law,  regulation  or zoning  ordinance or of said  certificate  of
occupancy,  subject to  Tenant's  right to  reasonably  contest  or appeal  such
governmental  action;  provided,  however,  that such  contest  rights shall not
suspend  Tenant's  obligation  to so comply during the pendency of any appeal or
contest.  Tenant shall comply with any direction of any  governmental  authority
having  jurisdiction  which  shall,  by reason of the nature of Tenant's  use or
occupancy of the Demised Premises,  impose any duty upon Tenant or Landlord with
respect  to the  Demised  Premises  or with  respect  to the  use or  occupation
thereof; provided, however (but without limiting Landlord's ability to determine
that the cost  thereof  constitutes  an  Operating  Expense for which  Tenant is
responsible  in  accordance  with the terms  hereof),  that Tenant shall have no
obligation to make any alterations,  replacements or improvements to the Demised
Premises,  Building or  Project,  including  without  limitation  structural  or
capital  improvements,  required to comply with such governmental action if such
alterations,  replacements  or  improvements  are not  required  as a result  of
Tenant's use or  occupancy of the Demised  Premises or as a result of the Tenant
Improvements  or any  other  Tenant  alterations  to  the  Demised  Premises  or
installation of Tenant's personal property in the Demised Premises. For example,
Tenant shall not be responsible for complying with seismic upgrade  requirements
imposed by governmental authority beyond Tenant's obligation to pay Tenant's Pro
Rata Share of Operating Expenses associated with such capital improvements.

         10.3.  Tenant  shall not do or permit to be done  anything  which  will
invalidate or permanently increase the cost of any fire, environmental, extended
coverage or any other  insurance  policy  covering  the Building and Project and
shall  comply  with all rules,  orders,  regulations,  and  requirements  of the
insurers  of the  Building  and Project and Tenant  shall  promptly  upon demand
reimburse  Landlord for any additional premium charged for such policy 

                                       11
<PAGE>

by reason of Tenant's  failure to comply  with the  provisions  of this  Section
10.3.

         10.4.     [Intentionally omitted.]

         10.5.  Tenant  shall  deliver  to  Landlord  copies of all new keys and
access  control  devices  promptly  following  installation.  Tenant must,  upon
termination  of this Lease return to Landlord all keys to offices and restrooms,
either  furnished to, or otherwise  procured by Tenant.  In the event any key so
furnished is lost,  Tenant shall pay to Landlord the cost of replacing  the same
or of changing the lock or locks opened by such lost key if Landlord  shall deem
it necessary to make such change.

         10.6. No awnings or other  projection  shall be attached to any outside
wall of the building.  Neither the interior nor exterior of any windows shall be
coated or otherwise  sunscreened without the express written consent of Landlord
(which shall not be unreasonably  withheld,  conditioned or delayed),  nor shall
any  bottles,  parcels,  or other  articles  be  placed on the  windowsills.  No
equipment,  furniture or other items of personal property shall be placed on any
exterior balcony without the express written consent of Landlord.

         10.7. No sign, advertisement,  or notice shall be exhibited, painted or
affixed by Tenant on any part of the Demised  Premises or the Building  which is
visible from the exterior of the Building  without the prior written  consent of
Landlord, which shall not be unreasonably withheld, conditioned or delayed.

         10.8.  Tenant  shall  cause any office  equipment  or  machinery  to be
installed  in  the  Demised  Premises  so as to  reasonably  prevent  sounds  or
vibrations  therefrom  from  extending into any other building of the Project or
any portion of the  Building  not leased to or occupied by Tenant.  Further,  no
equipment exceeding the recommended floor load capacity shall be placed upon the
second  floor  Demised  Premises  without  advance  notice  to and  approval  by
Landlord. Placement of such equipment, if approved by Landlord, shall be only at
a location designed to carry the weight of such equipment.

         10.9. Tenant shall not do or permit anything to be done in or about the
Demised Premises which shall in any way obstruct or interfere with the rights of
other tenants of the Project,  or injure or  unreasonably  annoy them, or use or
allow the Demised Premises to be used for immoral or unlawful purpose (provided,
however,  that any medical research activity permitted by the United States Food
and Drug Administration shall not be deemed to be an immoral purpose), nor shall
Tenant knowingly cause,  maintain or permit any nuisance or commit or permit any
act of waste in, on, or about the Demised Premises, Building or Project.

         10.10.  Notwithstanding  any other  provision  herein to the  contrary,
Tenant shall be responsible for all  liabilities,  costs and expense arising out
of or in  connection  with  the  compliance  of the  Demised  Premises  with the
Americans With  Disabilities  Act, 42 U.S.C.  ss. 12101, et seq.  (together with
regulations  promulgated  pursuant  thereto,  "ADA") and Tenant shall indemnify,
defend and hold harmless from and against any loss,  cost,  liability or expense

                                       12

<PAGE>

(including  reasonable  attorneys  fees and  disbursements)  arising  out of any
failure of the Demised Premises to comply with the ADA.

11.      Brokers

         11.1.  Tenant  represents and warrants that it has had no dealings with
any real estate broker or agent in connection with the negotiation of this Lease
other than John Burnham & Company  ("Broker"),  as has been disclosed in writing
to Landlord and that Tenant knows of no other real estate broker or agent who is
or might be entitled to a commission in connection with this Lease.

         11.2.  Tenant  hereby  indemnifies  and  shall  defend,  hold  and save
Landlord  harmless  from and against any and all claims for any  commissions  or
fees in connection  with this Lease made by any broker or finder having  worked,
or claiming to have worked, on behalf Tenant, other than Broker. Landlord hereby
indemnifies and shall defend, hold and save Tenant harmless from and against any
and all claims for any commissions or fees in connection with this Lease made by
any broker or finder  having  worked,  or claiming to have worked,  on behalf of
Landlord, other than Broker.

         11.3.  Tenant  represents and warrants that no broker or agent has made
any  representation  or warranty  relied upon by Tenant in Tenant's  decision to
enter into this Lease other than as contained in this Lease.

         11.4. Tenant  acknowledges and agrees that the employment of brokers by
Landlord is for the purpose of solicitation of offers of lease from  prospective
tenants and no authority is granted to any broker to furnish any  representation
(written or oral) or warranty from Landlord unless  expressly  contained  within
this Lease.  Landlord in executing  this Lease does so in reliance upon Tenant's
representations and warranties contained within Sections 11.1 and 11.3 hereof.

12.      Holding Over

         12.1.  If,  with  Landlord's  express  written  consent,  Tenant  holds
possession of all or any part of the Demised  Premises  after the  expiration or
earlier  termination  Term,  Tenant  shall  become a tenant from  month-to-month
(provided,  however, that if such holdover is with Landlord's consent and is for
less than 30 days,  Tenant's  obligation to pay Basic Annual Rent (or such other
amount as  Landlord  has  indicated)  shall be on a per diem basis  during  such
initial  30-day period) upon the Term  Expiration  Date, and in such case Tenant
shall  continue to pay monthly  installments  of Basic Annual Rent in the amount
payable  upon the Term  Expiration  Date,  or such other  amount as Landlord may
indicate,  in Landlord's sole and absolute discretion,  in such written consent,
and all other  provisions,  representations,  covenant and agreements  contained
herein,  other than with  respect to the Term and any  extensions  thereof,  but
specifically including,  without limitation, the adjustment of Basic Annual Rent
pursuant to Section 6 hereof, 

                                       13
<PAGE>

shall remain in full force and effect.

         12.2. Notwithstanding the foregoing, if Tenant remains in possession of
the Demised  Premises  after the  expiration or earlier  termination of the Term
without the express written consent of Landlord, Tenant shall become a tenant at
sufferance  upon the terms of this Lease except that the monthly rental shall be
equal to one hundred  twenty-five  percent  (125%) of the Basic  Annual Rent and
Additional  Rent in effect during the last thirty (30) days of the Term.  Tenant
shall be  responsible  for all damages  suffered by Landlord  resulting  from or
occasioned by Tenant's holding over.

         12.3.  Acceptance by Landlord of Rent after such  expiration or earlier
termination shall not result in a renewal or reinstatement of this Lease.

         12.4.  The  foregoing  provisions of this Section 12 are in addition to
and do not affect  Landlord's  right to re-entry or any other rights of Landlord
hereunder or as otherwise provided by law.

13.      Taxes on Tenant's Property

         13.1. Tenant shall pay, prior to delinquency,  any and all taxes levied
against any personal property or trade fixtures placed by Tenant in or about the
Demised Premises.

         13.2.  Subject to Tenant's  contest  rights as provided in Section 13.4
below,  if any such taxes on Tenant's  personal  property or trade  fixtures are
levied against Landlord or Landlord's  property or, if the assessed valuation of
the Building is increased by the inclusion  therein of a value  attributable  to
Tenant's  personal  property or trade fixtures,  and if Landlord,  after written
notice to  Tenant,  pays the taxes  based  upon such  increase  in the  assessed
valued,  then  Tenant  shall upon demand  repay to Landlord  the taxes so levied
against Landlord.

         13.3. If any  improvements  in or alterations to the Demised  Premises,
whether  owned by  Landlord  or Tenant and  whether  or not  affixed to the real
property so as to become a part  thereof,  are  assessed  for real  property tax
purposes  at a  valuation  higher  than  the  valuation  at  which  improvements
conforming to Landlord's  "Building Standard" in other spaces in the Project are
assessed,  then the real property taxes and assessments  levied against Landlord
or the Project by reason of such excess assessed valuation shall be deemed to be
taxes levied  against  personal  property of Tenant and shall be governed by the
provisions  of Section 13.2 above.  Any such excess  assessed  valuation  due to
improvements  in or  alterations to space in the Project leased by other tenants
of Landlord shall not be included in the Operating  Expenses  defined in Section
7.1, but shall be treated, as to such other tenants, as provided in this Section
13.3.

         13.4.  Tenant  shall have the right,  by  appropriate  proceedings,  to
protest or contest  with the  appropriate  governmental  agency any  assessment,
reassessment  or allocation  of Property  Taxes or other taxes payable by Tenant
hereunder,  in whole or in part;  provided that Tenant  

                                       14
<PAGE>


provides such financial  assurances as Landlord may reasonably  require in order
to bond over or provide  for such taxes and no jeopardy or threat to the Project
or any portion  thereof  exists as a result.  Tenant may act in its own name and
Landlord  shall,  at Tenant's  request and expense,  reasonably  cooperate  with
Tenant in connection  with such contest.  Tenant may utilize any legal procedure
for payment under protest,  if available,  and may sue to recover  overpayments.
Tenant  shall  indemnify,  hold  harmless  and defend  Landlord  and the Demised
Premises from any liens,  liabilities,  claims, losses, costs,  expenses,  fees,
judgments, actions, causes of action or damages (including,  without limitation,
reasonable  attorneys'  fees and  expenses)  arising  out of or  related  to any
contest of Property Taxes by Tenant and shall pay any Property Taxes  ultimately
determined  to be due,  together  with any interest or penalties  charged by the
taxing entity.

14.      Condition of Demised Premises

         14.1.  Tenant  acknowledges  that  neither  Landlord  nor any  agent of
Landlord has made any  representation  or warranty with respect to the condition
of the Demised  Premises or the  Building  or  Project,  or with  respect to the
suitability  for the conduct of Tenant's  business.  The taking of possession of
the Demised  Premises by Tenant shall,  except as otherwise agreed in writing by
Landlord  and  Tenant  conclusively  establish  that the  Demised  Premises  and
Building  were at such time in good,  sanitary and  satisfactory  condition  and
repair.  Tenant further  acknowledges  that, prior to the Effective Date, Tenant
has been in  possession of the Demised  Premises as owner,  that as owner Tenant
has developed an intimate familiarity with the Building and the Project and that
Tenant is accepting the Demised Premises "AS-IS."

15.      Common Areas and Parking Facilities

         15.1. Tenant shall have the  non-exclusive  right, in common with other
tenants of the  Building  or the  Project,  to use the Common  Areas  other than
parking  facilities  (provided,  however,  that with respect to the Common Areas
within the  Building  and so long as Tenant is the sole tenant of the  Building,
Tenant  shall  have the  exclusive  rights  thereto,  subject  to the  rights of
Landlord  under this  Lease),  subject to the rules and  regulations  adopted by
Landlord and attached hereto as Exhibit "C" together with such other  reasonable
and  nondiscriminatory  rules and  regulations  as are hereafter  promulgated by
Landlord in its discretion (the "Rules and Regulations").

         15.2.    [Intentionally omitted.]

         15.3.  Tenant  shall  have  the  exclusive  right  to use  the  parking
facilities  located  upon  the  Land,  subject  to the  Rules  and  Regulations;
provided,  however,  that  nothing in this Section 15.3 is intended to create an
affirmative duty on Landlord's part to monitor parking.

         15.4.  Landlord reserves the right to modify Common Areas including the
right to add or remove  exterior and interior  landscaping  (provided,  however,
that  Landlord  shall  have no right to modify the  portion  of the Common  Area
located within the Building unless a default by Tenant 

                                       15
<PAGE>

has occurred).

16.      Utilities and Services

         16.1.  Tenant shall pay for all water,  (including the cost to service,
repair and replace  reverse  osmosis,  deionized and other  treated  water) gas,
heat,  light,  power,  telephone  and other  utilities  supplied  to the Demised
Premises,  the Building and the Common Area, together with any fees,  surcharges
and taxes  thereon,  including,  without  limitation,  water in Common Areas for
drinking and lavatory purposes. If any such utility is not separately metered to
Tenant, Tenant shall pay a reasonable proportion to be determined by Landlord of
all charges  jointly  metered  with other  premises as part of Tenant's Pro Rata
Share of Operating Expenses, or in the alternative, Landlord may, at its option,
monitor the usage of such utilities by Tenant and charge Tenant with the cost of
purchasing,  installing and monitoring such metering  equipment,  which shall be
paid by Tenant as Additional  Rent.  Tenant agrees to pay for its Pro Rata Share
of water consumed in Common Areas, as shown on said meter, as and when bills are
rendered,  and on default in making such payment,  Landlord may pay such charges
and  collect  the same from  Tenant.  Any such costs or  expenses  incurred,  or
payments made by Landlord for any of the reasons or purposes herein above stated
shall be deemed to be  Additional  Rent  payment  by Tenant and  collectible  by
Landlord as such.

         16.2.  Landlord  shall not be liable  for,  nor shall any  eviction  of
Tenant result from,  the failure to furnish any such utility or service  whether
or not such failure is caused by accident,  breakage, repairs, strikes, lockouts
or other labor  disturbances  or labor disputes of any  character,  governmental
regulation,  moratorium  or other  governmental  action,  inability  despite the
exercise of  reasonable  diligence  or by any other cause,  including  the gross
negligence  of  Landlord.  In the  event of such  failure,  Tenant  shall not be
entitled to any  abatement  or  reduction  of Rent  (except to the extent of any
rental  abatement  or  interruption  insurance  proceeds  actually  received  by
Landlord with respect to such period), nor be relieved from the operation of any
covenant or agreement of this Lease.

         16.3.  Tenant shall pay directly to the  applicable  utility or service
provider,  prior  to  delinquency,  for any  separately  metered  utilities  and
services  which may be  furnished to Tenant or the Demised  Premises  during the
Term.

         16.4.  Tenant shall not, without the prior written consent of Landlord,
use any device in the Demised Premises,  including, but without limitation, data
processing  machines,  which will in any way increase the amount of ventilation,
air exchange,  gas, steam,  electricity or water beyond the existing capacity of
the Building as  proportionately  allocated to the Demised  Premises  based upon
Tenant's Pro Rata Share.

         16.5.  If Tenant  shall  require  services  in  excess of that  usually
furnished or supplied for similar space in the Building,  by reason of equipment
operated  and/or  extended hours of business  operation,  Tenant may procure the
same all at Tenant's sole cost and expense.

                                       16
<PAGE>

         16.6.  Landlord  shall  provide  water to the  outdoor  portions of the
Common  Areas for  landscape  irrigation  purposes  only,  and Tenant  shall pay
Tenant's Pro Rata Share thereof as an Operating Expense.

         16.7.  Landlord  reserves  the right to stop  service of the  elevator,
plumbing, ventilation, air conditioning and electric systems, when necessary, by
reason of accident or emergency or for repairs, alterations or improvements,  in
the judgment of Landlord  desirable or necessary to be made, until said repairs,
alterations  or  improvements  shall have been  completed,  and  Landlord  shall
further  have no  responsibility  or  liability  for failure to supply  elevator
facilities,  plumbing, ventilation, air conditioning,  electric or other utility
service,  when prevented from doing so by strike or accident, or by laws, rules,
order,  ordinances,  directions,  regulations  or  requirements  of any federal,
state,  country or  municipal  authority or failure to deliver gas, oil or other
suitable fuel supply or inability by exercise of reasonable  diligence to obtain
gas, oil or other suitable fuel. It is expressly  understood and agreed that any
covenants  on  Landlord's  part to furnish  any  service  pursuant to any of the
terms,  covenants,  conditions,  provisions or  agreements of this Lease,  or to
perform any act or thing for the benefit of Tenant, shall not be deemed breached
if  Landlord  is unable to furnish or perform  the same by virtue of a strike or
labor trouble or any other cause whatsoever.

17.      Alterations

         17.1. Tenant shall make no alterations, additions or improvements in or
to the Demised Premises without Landlord's prior written consent, which approval
shall not be unreasonably withheld,  conditioned or delayed (provided,  however,
that in the event any proposed  alteration,  addition or improvement affects (i)
any  structural  portions  of  the  Building  including  exterior  walls,  roof,
foundation and core of the Building,  (ii) the exterior of the Building or (iii)
any Building systems,  including elevator,  plumbing, air conditioning,  heating
electrical,  security,  life safety and power,  then  Landlord  may withhold its
consent with respect  thereto if Tenant does not provide  adequate  assurance to
Landlord of Tenant's ability to restore the Demised Premises to the condition in
which they existed prior to the  construction of such  alterations upon the Term
Expiration  Date),  and  then  only by  architects,  contractors,  suppliers  or
mechanics approved by Landlord in Landlord's sole discretion (provided, however,
that Tenant may make minor  alterations to the interior portions of the Building
which do not affect the  Building  systems,  which do not affect the  structural
portions of the  Building and which do not exceed  $100,000 in the  aggregate in
value  without  Landlord's  prior  consent but upon not less than 14 days' prior
notice to  Landlord).  In seeking  Landlord's  approval,  Tenant  shall  provide
Landlord,  at least fourteen (14) days in advance of any proposed  construction,
with  plans,  specifications,  bid  proposals,  work  contracts  and such  other
information  concerning  the  nature  and  cost  of  the  alterations  as may be
reasonably requested by Landlord.

         17.2.    [Intentionally omitted.]

                                       17
<PAGE>


         17.3.  Tenant agrees that there shall be no  construction of partitions
or other  obstructions  which might  interfere  with free  access to  mechanical
installation or service  facilities of the Building or interfere with the moving
of Landlord's equipment to or from the enclosures  containing said installations
or facilities.

         17.4.  Tenant agrees that any work by Tenant shall be  accomplished  in
such a manner as to permit any fire sprinkler system and fire water supply lines
to remain fully operable at all times.

         17.5. Tenant covenants and agrees that all work done by Tenant (whether
or not requiring  Landlord's  consent) shall be performed in compliance with all
laws, rules, orders, ordinances,  directions,  regulations,  and requirements of
all  governmental  agencies,  offices,  departments,  bureaus and boards  having
jurisdiction,  and in  full  compliance  with  the  rules,  orders,  directions,
regulations,  and requirements of any applicable fire rating bureau. Upon demand
by Landlord,  Tenant shall provide  Landlord with (i)  construction  agreements,
building plans,  lien releases and other similar  documentation  with respect to
any improvements or alterations  reasonably  requested by Landlord or Landlord's
lenders,  insurers or investors, and (ii) "as-built" plans showing any change in
the Demised Premises.

         17.6.  Before  commencing any work, Tenant shall give Landlord at least
fourteen (14) days prior  written  notice of the proposed  commencement  of such
work and  shall,  if  required  by  Landlord,  secure at  Tenant's  own cost and
expenses a completion  and lien indemnity  bond,  letter of credit or such other
security reasonably satisfactory to Landlord for said work.

         17.7. All alterations, attached equipment, decorations, fixtures, trade
fixtures,  additions and improvements,  subject to Section 17.9,  attached to or
built into the Demised Premises, made by either of Landlord or Tenant, including
(without  limiting the generality of the foregoing) all floor and wall covering,
built-in  cabinet  work and  paneling,  sinks  and  related  plumbing  fixtures,
exterior venting fume hoods and walk-in freezers and refrigerators, clean rooms,
climatized rooms,  ductwork,  conduits,  electrical  panels and circuits,  shall
become  the  property  of  Landlord  upon the Term  Expiration  Date or  earlier
termination of the term of this Lease,  and shall remain upon and be surrendered
with the Demised Premises as a part thereof;  provided,  however,  that Landlord
may at the time of Landlord's  consent to such alterations (or at any time if no
consent is  obtained  from  Landlord)  elect to cause  Tenant to remove any such
items  from  the  Demised  Premises  upon the Term  Expiration  Date or  earlier
termination of this Lease, and, if Landlord so elects,  Tenant shall remove such
alterations,   attached  equipment,   decorations,   fixtures,  trade  fixtures,
additions and improvements upon the Term Expiration Date or earlier  termination
of this Lease and restore any damage caused by or occasioned as a result of such
removal and further  provided that Tenant may remove the items listed on Exhibit
"D"  attached  hereto  so  long as  Tenant  restores  any  damage  caused  by or
occasioned as a result of such removal.

         17.8.  Tenant shall repair any damage to the Demised Premises caused by
Tenant's  removal of any  property  from the Demised  Premises.  During any such
restoration  period,  Tenant

                                       18
<PAGE>


shall pay Rent to Landlord as  provided  herein as if said space were  otherwise
occupied by Tenant.

         17.9.  Except as to those items listed on Exhibit "D"  attached  hereto
and  incorporated  herein,  all  business  and  trade  fixtures,  machinery  and
equipment,  built-in  furniture  and  cabinets,  together with all additions and
accessories  thereto,  installed in and upon the Demised  Premises  shall be and
remain the  property  of  Landlord  and shall not be moved by Tenant at any time
during the Term.  If Tenant  shall fail to remove  all of its  effects  from the
Demised Premises prior to expiration or earlier  termination of this Lease, then
Landlord may, at its option,  remove the same in any manner that Landlord  shall
choose,  and store said effects without  liability to Tenant for loss thereof or
damage  thereto,  and Tenant  agrees to pay  Landlord  upon demand any  expenses
incurred to such  removal and  storage or Landlord  may, at its option,  without
notice, sell said property or any of the same, at private sale and without legal
process,  for such price as Landlord  may obtain and apply the  proceeds of such
sale  against  any  amounts  due under this Lease from  Tenant to  Landlord  and
against any expenses incident to the removal,  storage and sale of said personal
property.

         17.10.  Notwithstanding  any other  provision of this Section 17 to the
contrary,  except with respect to the items list on Exhibit "D" attached hereto,
in no event may Tenant remove any  improvement  from the Demised  Premises as to
which Landlord  contributed  payment,  without Landlord's prior written consent,
which may be withheld in Landlord's sole discretion.

         17.11.  Tenant  shall pay to  Landlord  an amount  equal to ten percent
(10%) (not to exceed  $5,000) of the cost to Tenant of all  charges  incurred by
Tenant  of its  contractors  or  agents  in  connection  with  any  alterations,
additions  or  improvements  to the  Demised  Premises  for  projects  less than
$250,000,  and $10,000  plus all  reasonable  out-of-pocket  costs and  expenses
incurred by Landlord in  connection  therewith  for all  projects of $250,000 or
more, to cover Landlord's  overhead and expenses for plan review,  coordination,
scheduling and supervision thereof. Landlord shall use its good faith efforts to
review,  coordinate,  schedule and  supervise  any such project with  Landlord's
internal  personnel prior to incurring any material  out-of-pocket  cost related
thereto.  For  purposes of payment of such sum,  Tenant shall submit to Landlord
copies  of all  bills,  invoices,  and  statements  covering  the  costs of such
charges,  which will be accompanied by payment to Landlord of the percentage fee
set  forth  above.  Tenant  shall  reimburse  Landlord  for  any  extra  expense
reasonably  incurred  by Landlord by reason of faulty work done by Tenant or its
contractors, or by reason of inadequate cleanup.

18.      Repairs and Maintenance

         18.1. Landlord shall repair and maintain the structural portions of the
Demised  Premises  and the  exterior  portions of the Common  Areas,  including,
without  limitation,  structural  portions of the roof system (but not including
the roof membrane),  foundations,  exterior walls,  interior load bearing walls,
landscaping  and parking areas (and the full cost thereof shall be included as a
part of Operating Expenses),  unless such maintenance or repairs are 

                                       19
<PAGE>

required in whole or in part because of any act, neglect,  fault of or omissions
of any duty by Tenant,  its agents,  servants,  employees or invitees,  in which
case Tenant shall pay to Landlord the cost of such  maintenance and repairs.  If
Landlord fails to perform any of its repair and  maintenance  obligations  under
this Section 18.1, and such failure  materially  affects Tenant's ability to use
and occupy the Demised Premises for the purposes permitted herein,  Tenant shall
have the right,  but not the  obligation,  at Tenant's  sole cost and expense to
perform such repairs and/or  maintenance if such failure continues for more than
fifteen  (15) days after  written  notice  from  Tenant to  Landlord  and any of
Landlord's lenders; provided,  however, that if the nature of the repairs and/or
maintenance to be completed by Landlord is such that more than fifteen (15) days
are required to complete such repairs  and/or  maintenance,  Landlord shall have
such additional time as is reasonably  necessary to complete such repairs and/or
maintenance  so long as  Landlord  takes  appropriate  action to  commence  such
repairs  and/or  maintenance  within such fifteen (15) day period and thereafter
diligently pursues such repairs and/or maintenance to completion.

         18.2.  Except for  services of  Landlord,  if any,  required by Section
18.1,  Tenant shall at Tenant's sole cost and expense keep the Demised  Premises
and the Common Areas and every part thereof (including,  without limitation, the
roof membrane, the plumbing and the fire sprinkler,  heating,  ventilating,  air
conditioning,  elevator and  electrical  systems) in good  condition and repair,
damage  thereto from  ordinary wear and tear and casualty and  condemnation  not
caused  by Tenant  excepted.  Tenant  shall,  upon the Term  Expiration  Date or
earlier termination of this Lease, surrender the Demised Premises to Landlord in
as good as condition as when  received,  ordinary wear and tear and casualty and
condemnation not caused by Tenant excepted. Landlord shall have no obligation to
alter, remodel,  improve,  repair, decorate or paint the Demised Premises or any
part  thereof,  except as  specifically  set forth in Sections 22 and 23 of this
Lease.

         18.3.  Landlord shall not be liable for any failure to make any repairs
or to perform any  maintenance  which is an obligation  of Landlord  unless such
failure shall persist for an unreasonable  time after written notice of the need
of such repairs or maintenance is given to Landlord by Tenant. Tenant waives the
rights  under  Section 1941 and 1942 of the  California  Civil Code or under any
similar law,  statute or ordinance now or hereafter in effect to make repairs at
Landlord's expense.

         18.4.  Repairs under this Section 18 which are  obligations of Landlord
are subject to allocation among Tenant and other tenants as Operating Expenses.

         18.5.  This  Section 18 relates to repairs and  maintenance  arising in
ordinary  course of  operation  of the  Building,  the  Project  and any related
facilities. In the event of fire, earthquake,  flood, vandalism, war, or similar
cause of damage or destruction,  this Section 18 shall not be applicable and the
provisions of Section 22 shall apply and control.

19.      Liens

                                       20
<PAGE>

         19.1. Subject to the immediately succeeding sentence, Tenant shall keep
the Demised Premises, the Building, the Project and the real property upon which
the  Building and the Project are  situated  free from any liens  arising out of
work performed,  materials furnished or obligations  incurred by Tenant.  Tenant
further  covenants and agrees that any mechanic's lien filed against the Demised
Premises  or against the  Building or the Project for work  claimed to have been
done for,  or  materials  claimed  to have been  furnished  to  Tenant,  will be
discharged by Tenant, by bond or otherwise,  within ten (10) business days after
the filing thereof, at the sole cost and expense of Tenant, subject, however, to
Tenant's latest rights set forth in Section 19.4 below.

         19.2.  Should Tenant fail to discharge any lien of the nature described
in Section 19.1,  Landlord may at  Landlord's  election pay such claim or post a
bond or  otherwise  provide  security to eliminate  the lien as a claim  against
title and the cost thereof  shall be  immediately  due from Tenant as Additional
Rent.

         19.3.  In the event  Tenant shall lease or finance the  acquisition  of
equipment,  furnishings,  or  other  personal  property  of a  removable  nature
utilized by Tenant in the operation of Tenant's  business,  Tenant warrants that
any Uniform Commercial Code Financing Statement executed by Tenant will upon its
face or by exhibit thereto indicate that such Financing  Statement is applicable
only to  removable  personal  property  of Tenant  located  within  the  Demised
Premises.  In no event shall the address of the  Building  be  furnished  on the
statement  without  qualifying  language as to applicability of the lien only to
removable personal property. Should any holder of a Financing Statement executed
by Tenant  record or place of record a  Financing  Statement  which  appears  to
constitute a lien against any  interest of Landlord or against  equipment  which
may be located other than within the Demised  Premises,  Tenant shall within ten
(10) days after filing such Financing Statement (i) cause a copy of the Security
Agreement  or  other  documents  to which  Financing  Statement  pertains  to be
furnished to Landlord to facilitate  Landlord's being in a position to show such
lien is not applicable to Landlord's interest, and (ii) cause Tenant's lender to
amend any documents of record so as to clarify that such lien is not  applicable
to any interest of Landlord in the Building or the Project. If Tenant desires to
purchase  subject  to a  security  interest,  lease or obtain a loan  secured by
tenant's  personal  property and requests that Landlord execute a lien waiver or
consent to encumbrance in connection therewith,  Landlord agrees to execute such
lien waiver or consent to  encumbrance  in a form  reasonably  acceptable to the
Landlord,  the  delivery  of which  shall  not be  unreasonably  delayed  by the
Landlord.


         19.4.  Notwithstanding  anything to the contrary herein, Tenant may, in
good faith,  contest the validity of any lien of the nature described in Section
19.1, or any claim or demand  arising  therefrom,  and, as a condition  thereto,
Tenant shall, at its sole expense, indemnity,  defend, hold harmless and protect
itself,  Landlord  and the Demised  Premises  against the same and shall pay and
satisfy  any such  adverse  judgment  that may be  rendered  thereon  before the
enforcement thereof against the Landlord or the Demised Premises or the Project.
If Landlord shall in its discretion require,  Tenant shall furnish to Landlord a
letter of credit or surety bond in 

                                       21
<PAGE>

a form  reasonably  satisfactory  to Landlord  and in an amount equal to one and
one-half times the amount of such  contested lien claim or demand,  indemnifying
Landlord  against  liability for the same, as required by law for the holding of
the Demised Premises free from the effect of such lien or claim.

20.      Indemnification and Exculpation

         20.1. Tenant hereby  indemnifies and agrees to defend and save Landlord
harmless  from and against any and all  demands,  claims,  liabilities,  losses,
costs,  expenses,  actions,  causes of  action,  damages or  judgments,  and all
reasonable  expenses incurred in investigating or resisting the same (including,
without limitation, reasonable attorneys' fees, charges and disbursements),  for
injury or death to person or injury to  property  occurring  within or about the
Demised  Premises,   arising  directly  or  indirectly  out  of  Tenant's,  it's
employees, agents or guests use or occupancy of the Demised Premises or a breach
or default by Tenant in the  performance  of any of its  obligations  hereunder,
unless caused solely by the willful act or gross negligence of the Landlord.

         20.2.  Landlord  shall not be liable to Tenant and Tenant  assumes  all
risk of damage to personal  property or scientific  research,  including loss of
records  kept  within the  Demised  Premises if the cause of such damage is of a
nature which,  if Tenant had elected to maintain fire and theft  insurance  with
extended coverage and business records  endorsement  available on a commercially
reasonable  basis,  would  be a loss  subject  to  settlement  by the  insurance
carrier,  including,  but not  limited  to,  damage  or  losses  caused by fire,
electrical malfunctions, gas explosion, and water damage of any type, including,
but not limited to, broken water lines,  malfunction of fire  sprinkler  system,
roof  leakage  or  stoppages  of lines  unless and except if such loss is due to
willful  disregard  of  Landlord  after  written  notice by Tenant of need for a
repair which Landlord is responsible to make for an unreasonable period of time.
Tenant  further  waives any claim for  injury to  Tenant's  business  or loss of
income relating to any such damage or destruction of personal property including
any loss of records.

         20.3.  Landlord  shall not be liable to Tenant for any damages  arising
from any act,  omission  or neglect of any other  tenant in the  Building or the
Project or of any other third party provided that the foregoing shall not create
any liability of Tenant for any act,  omission or neglect of any other tenant in
the Building or Project (other than Tenant's  subtenants,  licensees,  invitees,
agents or contractors).

         20.4.  Security  devices and services,  if any, while intended to deter
crime may not in given instances  prevent theft or other criminal acts and it is
agreed  that  Landlord  shall not be liable  for  injuries  or losses  caused by
criminal acts of third parties and the risk that any security  device or service
may malfunction or otherwise be circumvented by a criminal is assumed by Tenant.
Tenant shall at Tenant's  cost obtain  insurance  coverage to the extent  Tenant
desires protection against such criminal acts.

                                       22
<PAGE>

21.      Insurance - Waiver of Subrogation

         21.1.  Landlord,  as part of Operating Expenses,  shall carry insurance
upon the Building, in an amount equal to full replacement cost (exclusive of the
costs of  excavation,  foundations,  and  footings,  and  without  reference  to
depreciation  taken by  Landlord  upon its books or tax  returns) or such lesser
coverage as Landlord may elect  provided  such  coverage is not less than ninety
percent  (90%) of such full  replacement  cost or the  amount of such  insurance
Landlord's mortgage lender requires Landlord to maintain,  providing  protection
against  any  peril  generally  included  within  the  classification  "Fire and
Extended   Coverage"  together  with  insurance  against  sprinkler  damage  (if
applicable), vandalism and malicious mischief. Landlord, subject to availability
thereof and, as part of Operating  Expenses,  shall  further  insure as Landlord
deems appropriate  coverage against flood,  environmental hazard and earthquake,
loss or failure of building  equipment,  rental loss during the period of repair
or rebuild  (for a period  not  exceeding  18  months),  workmen's  compensation
insurance  and  fidelity  bonds for  employees  employed  to  perform  services.
Notwithstanding  the foregoing,  Landlord may, but shall not be deemed  required
to,  provide  insurance  as to any  improvements  installed  by Tenant after the
Effective Date or which are in addition to the standard improvements customarily
furnished by Landlord  without  regard to whether or not such are made a part of
the Building.  The insurance maintained by Landlord on the Project shall include
reasonable  deductibles as are maintained by prudent owners of similar  projects
in the San Diego  metropolitan  area (which,  except with respect to  earthquake
coverages, shall not exceed 10% of the replacement value of the Building).

         21.2.  Landlord,  as part of Operating  Expenses,  shall  further carry
public and excess liability  insurance with a single loss limit of not less than
Five Million Dollars ($5,000,000) for death or bodily injury, or property damage
with respect to the Project.

         21.3.  Tenant at its own cost shall procure and continue in effect from
the Term Commencement Date and continuing  throughout the Term (and occupancy by
Tenant, if any, after the Term Expiration Date) comprehensive  public and excess
liability   insurance  with  limits  of  not  less  than  Five  Million  Dollars
($5,000,000)  per  occurrence  for death or bodily injury and not less than Five
Million  Dollars  ($5,000,000)  for property  damage with respect to the Demised
Property.

         21.4.  The aforesaid  insurance  required of Tenant shall name Landlord
and any mortgage  lender of Landlord who so requests as an  additional  insured.
Said  insurance  shall  be with  companies  having a  rating  of not  less  than
policyholder  rating of A and financial category rating of at least Class XII in
"Best's  Insurance  Guide."  Tenant shall obtain for Landlord from the insurance
companies or cause the insurance  companies to furnish  certificates of coverage
to  Landlord.  No such policy  shall be  cancellable  or subject to reduction of
coverage or other  modification  or  cancellation  except after thirty (30) days
prior written  notice to Landlord from the insurer.  All such policies  shall be
written  as  primary  policies  with  respect  to  the  Demised  Premises,   not
contributing  with and not in excess of the coverage  which  Landlord may carry.
Tenant's policy may be a "blanket policy" which  specifically  provides that the
amount of  

                                       23
<PAGE>

insurance shall not be prejudiced by other losses covered by the policy.  Tenant
shall,  at least  twenty  (20) days prior to the  expiration  of such  policies,
furnish Landlord with renewals or binders. Tenant agrees that if Tenant does not
take out and maintain  such  insurance,  Landlord may (but shall not be required
to), upon not less than five (5) days notice to Tenant,  procure said  insurance
on Tenant's behalf and at its cost to be paid as Additional Rent.

         21.5.  Tenant  assumes  the  risk of  damage  to any  fixtures,  goods,
inventory,  merchandise,  equipment,  and leasehold  improvements,  and Landlord
shall  not be  liable  for  injury to  Tenant's  business  or any loss of income
therefrom relative to such damage all as more particularly  heretofore set forth
within this Lease.  Tenant at Tenant's cost shall carry such insurance as Tenant
desires for Tenant's  protection with respect to personal  property of Tenant or
business interruption.

         21.6.  In  each  instance  where  insurance  is  to  name  Landlord  as
additional insured, Tenant shall upon written request of Landlord also designate
and furnish certificates so evidencing Landlord as additional insured to (i) any
lender of Landlord holding a security  interest in the Building or real property
upon which the  Building is situated,  and/or (ii) the landlord  under any lease
wherein  Landlord  is tenant of the real  property  whereupon  the  Building  is
located if the  interest of Landlord is or shall become that of a tenant under a
ground  lease  rather  than that of a fee  owner,  and/or  (iii) any  management
company retained by Landlord to manage the Building or the Project.

         21.7.  Landlord  and  Tenant  each  hereby  waive any and all rights of
recovery  against  the other or  against  the  officers,  directors,  employees,
agents,  and  representatives  of the  other,  on  account  of  loss  or  damage
occasioned to such waiving party or its property or the property of others under
its control to the extent that such loss or damage is insured  against under any
fire and extended  coverage  insurance  policy which either may have in force at
the time of such loss or damage.  Such waivers  shall  continue as long as their
respective  insurers  so permit  or such  waivers  are  generally  permitted  by
insurance  carriers in the California  market (provided that neither party shall
be required to pay any material amount to their respective  insurers in order to
maintain such  waivers).  Any  termination  of such a waiver shall be by written
notice of  circumstances  as  hereinafter  set forth.  Landlord  and Tenant upon
obtaining the policies of insurance required or permitted under this Lease shall
give notice to the  insurance  carrier or  carriers  that the  foregoing  mutual
waiver of subrogation is contained in this Lease.  If such policies shall not be
obtainable  with such waiver or shall be so  obtainable  only at a premium  over
that chargeable  without such waiver, the party seeking such policy shall notify
the other thereof,  and the latter shall have ten (10) days thereafter to either
(i) procure such insurance with companies  reasonably  satisfactory to the other
party or (ii) agree to pay such additional  premium. If neither (i) nor (ii) are
done,  this Section 21.7 shall have no effect  during such time as such policies
shall not be obtainable or the party in whose favor a waiver of  subrogation  is
desired  refuses to pay the  additional  premium.  If such policies shall at any
time be unobtainable,  but shall be subsequently obtainable, neither party shall
be subsequently liable for a failure to obtain such insurance until a reasonable
time after  notification  thereof by the other  party.  If the release 

                                       24
<PAGE>

of either Landlord or Tenant, as set forth in the first sentence of this Section
21.7 shall  contravene  any law with  respect  to  exculpatory  agreements,  the
liability  of the party in question  shall be deemed not  released  but shall be
secondary to the other's insurer.

         21.8.  Landlord  may require  insurance  policy  limits to be raised to
conform with any reasonable  requirements  of Landlord's  lender and/or to bring
coverage  limits  to levels  then  generally  being  required  by  institutional
landlords for comparable projects.

22.      Damage or Destruction

         22.1. In the event of a partial  destruction of the Building by fire or
other perils covered by extended coverage insurance,  not exceeding  twenty-five
percent (25%) of the full replacement cost thereof, and if the damage thereto is
such that the  Building  may be  repaired,  reconstructed  or restored  within a
period of six (6) months from the date of the  happening  of such  casualty  and
Landlord will receive  insurance  proceeds  sufficient to cover the cost of such
repairs (except for any deductible amount provided by Landlord's  policy,  which
deductible amount if paid by Landlord shall be an Operating  Expense),  Landlord
shall commence and proceed  diligently  with the work of repair,  reconstruction
and restoration and this Lease shall continue in full force and effect.

         22.2.  In the event of any damage to or  destruction  of the  Building,
other  than  as  provided  in  Section  22.1,  Landlord  may  elect  to  repair,
reconstruct and restore the Building, in which case this Lease shall continue in
full force and effect. If Landlord elects not to repair then the Term Expiration
Date shall be (and this Lease shall terminate as of) the date of destruction.

         22.3.  Landlord  shall give written notice to Tenant of its election to
repair or not to repair,  reconstruct  or restore the Building or Project within
the sixty (60) day period following the date of damage or destruction.

         22.4. Upon any termination of this Lease under any of the provisions of
this Section,  the parties shall be released thereby without further  obligation
to the other from the date possession of the Demised  Premises is surrendered to
the Landlord except for items which have theretofore occurred.

         22.5. In the event of repair,  reconstruction and restoration as herein
provided,  the rental  provided  to be paid  under  this  Lease  shall be abated
proportionately  based  on the  extent  to  which  Tenant's  use of the  Demised
Premises  is  impaired  during  the  period of such  repair,  reconstruction  or
restoration,  unless Landlord provides Tenant with other comparable space during
the period of repair,  which in Tenant's  reasonable opinion is suitable for the
temporary  conduct of Tenant's  business  and which shall be leased by Tenant on
terms substantially  similar to this Lease, but at monthly installments of Basic
Annual Rent  equitably  reduced to reflect the area and  permitted  uses of such
temporary premises.

                                       25
<PAGE>

         22.6.  Notwithstanding  anything  to the  contrary  contained  in  this
Section,  should  Landlord be delayed or prevented from completing the repair or
restoration  of the damage to the Demised  Premises after the occurrence of such
damage  or  destruction   by  reason  of  acts  of  God  or  war,   governmental
restrictions, inability to procure the necessary labor or materials, strikes, or
other  circumstances  beyond the control of  Landlord,  the time for Landlord to
commence or complete  repairs  shall be extended,  provided,  at the election of
Landlord,  Landlord  shall be relieved of its obligation to make such repairs or
restoration and Tenant shall be released from its obligation under this Lease as
of the end of eight (8) months from date of destruction,  if repairs required to
provide Tenant use of the Demised Premises are not then substantially complete.

         22.7.  If  Landlord is  obligated  to or elects to repair or restore as
herein provided, Landlord shall be obligated to make repairs or restoration only
of those  portions of the Building and the Demised  Premises which were provided
at  Landlord's  expense;  the repair  and  restoration  of items not  provide at
Landlord's  expense  shall be the  obligation  of  Tenant.  In the event  Tenant
elected to upgrade certain  improvements  from the standard normally provided by
Landlord,  Landlord shall upon the need for  replacement due to an insured loss,
provide only the standard  Landlord  improvements  unless  Tenant shall elect to
again  upgrade  and pay any  additional  cost of such  upgrades,  except to such
extent as  insurance  proceeds  which,  if  received,  the excess  proceeds  are
adequate  to  provide  such  upgrades,   in  addition  to  providing  for  basic
reconstruction and standard improvements.

         22.8.  Notwithstanding  anything  to the  contrary  contained  in  this
Section,   Landlord  shall  not  have  any  obligation   whatsoever  to  repair,
reconstruct  or  restore  the  Demised  Premises  to the extent  that  insurance
proceeds are not  available  therefor  (except for the amount of the  deductible
carried by  Landlord  as  permitted  hereunder).  In  addition,  notwithstanding
anything to the contrary contained in this Section 22, if at any time during the
last twenty four (24) months of the term of this Lease there is damage for which
the cost to repair exceeds two months' installments of Basic Annual Rent, or the
repair,  reconstruction  or  restoration  of which is  reasonably  determined by
Landlord to exceed two (2) months from the date of damage or  destruction,  then
Landlord shall have no obligation whatsoever, to repair,  reconstruct or restore
the Demised  Premises and Landlord may terminate this Lease effective sixty (60)
days following the date of occurrence of such damage by giving written notice to
the Tenant of its  election  to do so within  thirty (30) days after the date of
occurrence of such damage; provided, however, that if Tenant at the time of such
election has an exercisable  option to extend this Lease so that the Lease after
exercise of such option  would have an  unexpired  term of not less seven years,
then Tenant may  preserve  this Lease,  notwithstanding  Landlord's  election to
terminate this Lease, by (a) exercising such option,  and (b) providing Landlord
with any shortage in insurance  proceeds (or adequate  assurance thereof) needed
to make the  repairs on or before the  earlier of (i) the date which is ten (10)
days after Tenant's receipt of Landlord's written notice purporting to terminate
this Lease, or (ii) the day prior to the date upon which such option expires. If
Tenant duly exercises such option during such period and provides  Landlord with
funds (or  adequate  assurance  thereof)  to cover  any  shortage  in  insurance
proceeds,  Landlord shall,  at Landlord's  expense repair such damage as soon as
reasonably  possible and this Lease shall continue in full force and effect.  If

                                       26
<PAGE>

Tenant fails to exercise such option and provide such funds or assurance  during
such  period,  then this Lease shall  terminate  as of the date set forth in the
first sentence of this Paragraph 22.8.

23.      Eminent Domain

         23.1.  In the  event the whole of the  Demised  Premises,  or such part
thereof or of the Project as shall substantially interfere with the Tenant's use
and occupancy thereof,  shall be taken for any public or quasi-public purpose by
any  lawful  power or  authority  by  exercise  of the  right of  appropriation,
condemnation  or eminent  domain,  or sold to  prevent  such  taking,  Tenant or
Landlord  may  terminate  this  Lease  effective  as of the date  possession  is
required to be surrendered to said authority.

         23.2. In the event of a partial taking of the Building,  the Project or
of drives,  walkways,  and parking areas serving the Building or the Project for
any public or quasi-public  purpose by any lawful power or authority by exercise
of right of appropriation,  condemnation,  or eminent domain, or sold to prevent
such  taking,  then  without  regard as to whether  any  portion of the  Demised
Premises  occupied by Tenant was so taken,  Landlord may elect to terminate this
Lease  as of such  taking  if such  taking  is,  in the  reasonable  opinion  of
Landlord,  of a material  nature such as to make it uneconomical to continue use
of the unappropriated  portion for purposes of office rentals,  laboratory space
or manufacturing facilities.

         23.3.  Tenant  shall be  entitled  to any award  which is  specifically
awarded as compensation for the taking of Tenant's  personal  property which was
installed  at Tenant's  expense,  for the value of Tenant's  good will,  for any
damage to Tenant's  business and for costs of Tenant  moving to a new  location.
Except as before set forth, any award for such taking shall belong to Landlord.

         23.4.  If upon any taking of the nature  described  in this  Section 23
this Lease continues in effect,  the Landlord shall promptly  proceed to restore
the  Demised  Premises,  Building  and the Project to  substantially  their same
condition  prior to such  partial  taking.  To the extent  such  restoration  is
feasible,  as determined by Landlord in its sole  discretion,  the Rent shall be
abated  proportionately  based  upon the  extent  to which  Tenant's  use of the
Demised  Premises  has  decreased on the basis of the  percentage  of the rental
value of the  Demised  Premises  after such  taking and the rental  value of the
Demised Premises prior to such taking.

24.      Defaults and Remedies

         24.1.  Late  payment by Tenant to  Landlord  of Rent and other sums due
will cause  Landlord to incur costs not  contemplated  by this Lease,  the exact
amount of which will be extremely difficult and impracticable to ascertain. Such
costs include,  but are not limited to,  processing  and accounting  charges and
late  charges  which may be imposed on Landlord by the terms of any  mortgage or
trust deed covering the Demised Premises.  Therefore, if any installment of Rent
due from Tenant is not received by Landlord  within ten (10) days after delivery
by Landlord of a notice of delinquency  to Tenant,  Tenant shall pay to Landlord
an  

                                       27
<PAGE>

additional  sum of three percent (3%) of the overdue Rent as a late charge.  The
parties agree that this late charge represents a fair and reasonable estimate of
the costs  that  Landlord  will incur by reason of late  payment  by Tenant.  In
addition to the late charge, Rent not paid when due shall bear interest from the
5th day after date due until paid at the lesser of (i) twelve  percent (12%) per
annum or (ii) the maximum  rate  permitted  by law (such rate being  referred to
herein as the "Default Rate").

         24.2.  No payment by Tenant or receipt by Landlord  of a lesser  amount
than the Rent  payment  herein  stipulated  shall be deemed to be other  than on
account of the Rent, nor shall any  endorsement or statement on any check or any
letter  accompanying  any check or  payment  as Rent be  deemed  an  accord  and
satisfaction, and Landlord may accept such check or payment without prejudice to
Landlord's  right to recover the balance of such Rent or pursue any other remedy
provided.  If at any time a dispute shall arise as to any amount or sum of money
to be paid by Tenant to  Landlord,  Tenant  shall have the right to make payment
"under  protest" and such payment shall not be regarded as a voluntary  payment,
and there shall  survive the right on the part of Tenant to  institute  suit for
recovery of the payment paid under protest.

         24.3. If Tenant fails to pay any sum of money required to be paid by it
hereunder,  or shall fail to perform  any other act on its part to be  performed
hereunder,   Landlord  may,   without  waiving  or  releasing  Tenant  from  any
obligations  of Tenant,  but shall not be  obligated  to,  make such  payment or
perform  such act.  All sums so paid or  incurred  by  Landlord,  together  with
interest thereon,  from the date such sums were paid or incurred, at the Default
Rate shall be payable to Landlord on demand as Additional Rent.

         24.4. The  occurrence of any one or more of the following  events shall
constitute a "Default" hereunder by Tenant:

                  24.4.1   The abandonment of the Demised Premises by Tenant;

                  24.4.2  The  failure  by  Tenant to make any  payment  of Rent
within three days after written notice that the same is due (provided,  however,
the Landlord  shall have no obligation to give Tenant  written  notice more than
two times in any twelve month period);

                  24.4.3  The  failure  by  Tenant to  observe  or  perform  any
obligation or covenant  contained herein (other than described in Section 24.4.1
and 24.4.2) to be performed by Tenant which results in a threat to the health or
safety of any  tenants or  occupants  of the  Building  or  Project,  where such
failure  shall  continue for a period of three (3) business  days after  written
notice thereof from Landlord to Tenant.

                  24.4.4  The  failure  by  Tenant to  observe  or  perform  any
obligation or covenant contained herein (other than described in Section 24.4.1,
24.4.2 and 24.4.3) to be performed by Tenant,  where such failure shall continue
for a period of thirty (30) days after written  notice  thereof from Landlord to
Tenant.  Such  notice  shall be in lieu of, and not in  addition  to, any 

                                       28
<PAGE>

notice required under California Code or Civil Procedure Section 1161;  provided
that if the nature of Tenant's default is such that it reasonably  requires more
than thirty (30) days to cure,  then Tenant shall not be deemed to be in default
if Tenant  shall  commence  such cure  within  said  thirty  (30) day period and
thereafter  diligently prosecute the same to completion provided,  however, that
such cure is  completed  no later  than sixty (60) days from the date of written
notice;

                  24.4.5  Tenant makes a general  assignment  for the benefit of
creditors;

                  24.4.6 A receiver,  trustee or custodian  is appointed  to, or
does,  take  title,  possession  or control of all,  or  substantially  all,  of
Tenant's assets;

                  24.4.7 Tenant files a voluntary  petition under the Bankruptcy
Code (or any  similar  law) or an order for  relief is  entered  against  Tenant
pursuant to a voluntary or involuntary proceeding commenced under any chapter of
the Bankruptcy Code;

                  24.4.8 Any  involuntary  petition if filed  against the Tenant
under any chapter of the Bankruptcy Code and is not dismissed within ninety (90)
days; or

                  24.4.9 Tenant's  interest in this Lease is attached,  executed
upon,  or otherwise  judicially  seized and such action is not  released  within
ninety (90) days of the action.

                  24.4.10 Tenant  defaults  beyond any  applicable  grace period
under that  certain Loan and Security  Agreement of even date  herewith,  by and
between  Tenant,  as borrower,  and  Landlord,  as lender,  or any  documents or
instruments delivered in connection therewith.

Notices  given under this  Section  24.4 shall  specify the alleged  default and
shall demand that Tenant  perform the  provisions  of this Lease or pay the Rent
that is in arrears, as the case may be, within the applicable period of time, or
quit the Demised  Premises.  No such notice  shall be deemed a  forfeiture  or a
termination of this Lease unless Landlord elects otherwise in such notice.

         24.5.  During the  continuance of a Default by Tenant,  with or without
notice or demand and without  limiting  Landlord in the exercise of any right or
remedy which Landlord may have, Landlord shall be entitled to terminate Tenant's
right to possession of the Demised  Premises by any lawful means,  in which case
this Lease shall terminate and Tenant shall immediately  surrender possession of
the  Demised  Premises  to  Landlord.  In such  event,  Landlord  shall have the
immediate  right to  re-enter  and remove all  persons  and  property,  and such
property  may be removed and stored in a public  warehouse  or  elsewhere at the
cost of, and for the account of Tenant,  all without service of notice or resort
to legal process and without being deemed guilty of trespass, or becoming liable
for any loss or  damage  which may be  occasioned  thereby.  In the  event  that
Landlord shall elect to so terminate this Lease, then Landlord shall be entitled
to recover  from Tenant all  damages  incurred by Landlord by reason of Tenant's
default, including:

                                       29
<PAGE>

                  24.5.1 The worth at the time of award of any unpaid Rent which
had been earned at the time of such termination; plus

                  24.5.2  The worth at the time of award of the  amount by which
the unpaid Rent which would have been earned after termination until the time of
award  exceeds that  portion of such rental loss which Tenant  proves could have
been reasonably avoided; plus

                  24.5.3  The worth at the time of award of the  amount by which
the unpaid Rent for the balance of the term after the time of award  exceeds the
amount of such  rental  loss which  Tenant  proves  could  have been  reasonably
avoided; plus

                  24.5.4 Any other amount  necessary to compensate  Landlord for
all the  detriment  proximately  caused  by  Tenant's  failure  to  perform  its
obligation  under this Lease or which in the ordinary  course of things would be
likely to result therefrom, including, but not limited to, the cost of restoring
the Demised  Premises to the condition  required  under the terms of this Lease;
plus

                  24.5.5 At the  Landlord's  election,  such  other  amounts  in
addition to or in lieu of the foregoing as may be permitted from time to time by
applicable law.

As used in Sections 24.5.1 and 24.5.2 above,  "worth at the time of award" shall
be computed by allowing  interest at the rate specified in Section 24.1. As used
in Section 24.5.3 above,  the "worth at the time of the award" shall be computed
by taking the present  value of such amount,  by using the discount  rate of the
Federal  Reserve  Bank of San  Francisco  at the time of the award  plus six (6)
percentage points.

         24.6. If Landlord does not elect to terminate this Lease as provided in
this  Section,  then  Landlord  may,  from time to time,  recover all Rent as it
becomes  due under this Lease.  At any time  thereafter,  Landlord  may elect to
terminate this Lease and to recover damage to which Landlord is entitled.

         24.7. In the event  Landlord  elects to terminate  this Lease and relet
the  Demised  Premises,  it may  execute  any new lease in its own name.  Tenant
hereunder  shall have no right or authority  whatsoever to collect any Rent from
such tenant. The proceeds of any such reletting shall be applied as follows:
 
                  First, to the payment of any indebtedness  other than Rent due
         hereunder  from  Tenant to  Landlord,  including,  but not  limited to,
         storage charges or brokerage  commissions owing from Tenant to Landlord
         as the result of such reletting;

                  Second,  to the payment of the costs and expenses of reletting
         the Demised Premises,  including alterations and repairs which Landlord
         deems  reasonably  necessary and advisable  and  reasonable  attorneys'
         fees, charges and disbursements incurred by

                                       30
<PAGE>

         Landlord in  connection  with the retaking of the Demised  Premises and
         such reletting;

                  Third, to the payment of Rent and other charges due and unpaid
         hereunder; and

                  Fourth,  to the  payment  of  future  Rent and  other  damages
         payable by Tenant under this Lease.

         24.8. All rights,  options,  and remedies of Landlord contained in this
Lease shall be construed and held to be nonexclusive  and  cumulative.  Landlord
shall  have the right to  pursue  any one or all of such  remedies  or any other
remedy or relief  which may be  provided  by law,  whether or not stated in this
Lease.  No waiver of any default of Tenant  hereunder  shall be implied from any
acceptance  by  Landlord  of any Rent or other  payments  due  hereunder  or any
omission  by  Landlord  to take any action on  account  of such  default if such
default  persists or is repeated,  and no express  waiver shall affect  defaults
other than as specified in said waiver.

         24.9.  Termination  of this Lease or Tenant's  right to  possession  by
Landlord  shall not relieve  Tenant  from any  liability  to Landlord  which has
theretofore accrued or shall arise based upon events which occurred prior to the
last to occur of (i) the Term  Expiration  Date or (ii) the date  possession  of
Demised Premises is surrendered.

         24.10.  Landlord  shall  not be in  default  unless  Landlord  fails to
perform  obligations  required of Landlord  within a reasonable  time, but in no
event  shall such  failure to  continue  be for more than thirty (30) days after
written notice by Tenant specifying  wherein Landlord has failed to perform such
obligation;  provided,  however,  that if the nature of Landlord's obligation is
such that more than thirty (30) days are required for performance, then Landlord
shall not be in default if  Landlord  commences  performance  within such thirty
(30) day period and thereafter diligently prosecutes the same to completion.

         24.11. In the event of any default on the part of Landlord, Tenant will
give notice by  registered  or certified  mail to any  beneficiary  of a deed of
trust or  mortgagee  or a mortgage  covering  the  Demised  Premises  and to any
landlord of any lease of any building in which Demised Premises is located whose
address  shall have been  furnished,  and Tenant  shall offer such  beneficiary,
mortgagee  and/or  landlord  a  reasonable  opportunity  to  cure  the  default,
including  the minimum  amount of time  necessary  to obtain  possession  of the
Building by power of sale or a judicial action if such should prove necessary to
effect a cure,  provided the Landlord  shall have furnished to Tenant in writing
the names and addresses of all such persons who are to receive such notices.

25.      Assignment or Subletting

         25.1.  Except  as  hereinafter  provided,   Tenant  shall  not,  either
voluntarily or by operation of law, directly or indirectly,  sell,  hypothecate,
assign, pledge, encumber or otherwise transfer this Lease, or sublet the Demised
Premises or any part  thereof,  or permit or suffer the Demised  

                                       31
<PAGE>

Premises  or any part  thereof to be used or  occupied  as work  space,  storage
space, mailing privileges,  concession or otherwise by anyone other than Tenant,
Tenant's  employees  or  consultants,  or employees  of Tenant's  joint  venture
partners,  without the prior written consent of Landlord in each instance, which
consent may be withheld  in  Landlord's  sole  discretion  (except as  otherwise
provided  herein).  Notwithstanding  anything to the contrary set forth  herein,
Landlord does hereby consent to the existing sublease of portions of the Demised
Premises pursuant to that certain Industrial  Multi-Tenant Lease between Tenant,
as "Landlord," and Advanced Tissue  Sciences,  Inc., as "Tenant," dated July 15,
1996,  and that  certain  Building  Lease  Agreement,  dated August 9, 1996 (the
"Antenna Lease"),  between Tenant, as "Lessor," and Cox California PCS, Inc., as
"Lessee," for rooftop communication facilities, which leases and the obligations
of lessor thereunder are being retained by Tenant.

         25.2. If Tenant is a corporation,  the shares of which are not actively
traded upon a stock exchange or in the  over-the-counter  market,  a transfer or
series of transfers whereby  twenty-five percent (25%) or more of the issued and
outstanding   shares  of  such  corporation  are,  or  the  voting  control  is,
transferred  (but excepting  transfers  upon deaths of individual  shareholders)
from a person or persons or entity or entities which were owners thereof at time
of  execution of this Lease to persons or entities who were not owners of shares
of the  corporation  at time of  execution  of this  Lease  shall be  deemed  an
assignment  of this Lease  requiring  the  consent of  Landlord  as  provided in
Section 25.1 above.

         25.3.  If Tenant  desires to assign this Lease to any entity into which
Tenant is merged,  with which  Tenant is  consolidated,  which  acquires  all or
substantially  all of the assets of Tenant,  or which is  controlled  by,  under
common  control  with or  controls  Tenant,  provided  that the  assignee  first
executes, acknowledge and delivers to Landlord an agreement whereby the assignee
agrees to be bound by all of the covenants and agreements in this Lease and that
the assignee  shall have a net worth  (determined  in accordance  with generally
accepted  accounting  principles  consistently  applied)  immediately after such
assignment which is at least equal to the net worth (as so determined) of Tenant
immediately prior to the assignment (or as of the date hereof, if greater), then
Landlord, upon receipt of proof of foregoing shall consent to such assignment.

         25.4. In the event Tenant desires to assign,  sublease,  hypothecate or
otherwise  transfer  this Lease or sublet the  Demised  Premises,  then at least
fifteen  (15) days,  but not more than ninety (90) days,  prior to the date when
Tenant  desires the  assignment  or sublease to be  effective  (the  "Assignment
Date"), Tenant shall give Landlord a notice (the "Assignment Notice") containing
information  (including  references)  concerning  the  character of the proposed
assignee  or  sublessee,  the  Assignment  Date,  any  ownership  or  commercial
relationship  between  Tenant and the proposed  assignee or  sublessee,  and the
consideration  and all other  material  terms  and  conditions  of the  proposed
assignment  or  sublease  along  with such other  information  as  Landlord  may
reasonably  require,  all in such detail as Landlord shall  reasonably  require.
Tenant shall also tender to Landlord,  reasonable attorneys fees and other costs
or overhead  expenses incurred by Landlord in reviewing Tenants request for such
assignment.

                                       32
<PAGE>

         25.5. Landlord in making its determination as to whether consent should
be given to a proposed  assignment or sublease,  may give  consideration  to the
financial strength of such assignee or subtenant  (notwithstanding  the assignor
or sublessor remaining liable for Tenant's performance), any change in use which
such  assignee  or  subtenant  proposes to make in use of Demised  Premises  and
desire of Landlord to exercise rights under Section 25.10 to obtain cancellation
of this Lease.  In no event  shall  Landlord  be deemed to be  unreasonable  for
declining to consent to transfer to an assignee or subtenant of poor reputation,
lacking financial qualifications, or seeking change in use.

         25.6.  As  conditions  precedent to Landlord  considering  a request by
Tenant to Tenant's  transfer of rights or  subletting  of the Demises  Premises,
Landlord may require any or all of the following:

                  25.6.1  Tenant  shall  remain  fully  liable  under this Lease
during the unexpired Term;

                  25.6.2 Tenant shall provide Landlord with evidence  reasonably
satisfactory to Landlord that the value of Landlord's  interest under this Lease
will not thereby be diminished or reduced. Such evidence shall include, but need
not be limited to,  evidence  respecting  the relevant  business  experience and
financial responsibility and status of the third party concerned;

                  25.6.3 Tenant shall reimburse  Landlord for Landlord's  actual
costs and expenses,  including, without limitation,  reasonable attorneys' fees,
charges and disbursements incurred in connection with the review, processing and
documentation of such request;

                  25.6.4  If  Tenant's  transfer  of rights  or  sharing  of the
Demised Premises  provides for the receipt by, on behalf or on account of Tenant
of any  consideration  of any  kind  whatsoever  (including,  but  not by way of
limitation,  a  premium  rental  for a  sublease  or  lump  sum  payment  for an
assignment)  in excess of the rental and other  charges due Landlord  under this
Lease,  Tenant  shall be entitled to retain such excess for Tenant's own account
and benefit;

                  25.6.5 Written  agreement from any applicable third party that
in the event  Landlord  gives such third party  notice that Tenant is in default
under this Lease, such third party shall thereafter make all payments  otherwise
due Tenant  directly to Landlord,  which  payments  will be received by Landlord
without any liability to Landlord  except to credit such payment against amounts
due under the Lease,  and any such third party shall agree to attorn to Landlord
or its  successors  and assigns  should this Lease be terminated for any reason;
provided,  however that in no event shall  Landlord or its successors or assigns
be obligated to accept such attornment;

                  25.6.6 Any such  transfer  and  consent  shall be  effected on
forms reasonably approved by Landlord as to form and substance;

                                       33
<PAGE>


                  25.6.7  Tenant  shall not then be in Default  hereunder in any
respect;

                  25.6.8 Such third party's proposed use of the Demised Premises
shall be substantially the same as Tenant's Permitted Use;

                  25.6.9  Landlord  shall not be bound by any  provision  of any
agreement pertaining to Tenant's transfer of rights or subletting of the Demised
Premises;

                  25.6.10  Any  agreement  pertaining  to  Tenant's  transfer of
rights or subletting of the Premises  shall be in a form  acceptable to Landlord
in Landlord's reasonable discretion and any such agreement shall not be modified
or  amended  without  Landlord's  prior  written  consent,  which  shall  not be
unreasonably withheld;

                  25.6.11 Tenant shall deliver to Landlord one original executed
copy of any and all  written  instruments  evidencing  or  relating  to Tenant's
transfer of rights or subletting of the Demised Premises; and

                  25.6.12  A  list  of  Hazardous  Materials,  certified  by the
proposed sublessee to be true and correct,  which the proposed sublessee intends
to use or store in the Demised Premises.  Additionally,  Tenant shall deliver to
Landlord,  on or before the date any proposed  sublessee  takes occupancy of the
Demised  Premises,  all of the items  relating to  Hazardous  Materials  of such
proposed sublessee.

         25.7. Any sale, assignment,  hypothecation or transfer of this Lease or
subletting of the Demised Premises that is not in compliance with the provisions
of this Section 25 shall be void and shall, at the option of Landlord, terminate
this Lease.

         25.8. The consent by Landlord to an assignment or subletting  shall not
relieve  Tenant or any  assignees  of this  Lease or  sublessee  of the  Demised
Premises  from  obtaining  the consent of Landlord to any further  assignment or
subletting  nor shall it release  Tenant or any  assignee or sublessee of Tenant
from full and primary liability under the Lease.

         25.9. Notwithstanding any subletting or assignment, Tenant shall remain
fully and primarily liable for the payment of all Rent and other sums due, or to
become  due  hereunder,  and  for  the  full  performance  of all  other  terms,
conditions,  and covenants to be kept and performed by Tenant. The acceptance of
Rent or any other sum due  hereunder,  or the  acceptance of  performance of any
other term,  covenant,  or  condition  thereof,  from any other person or entity
shall not be deemed to be a waiver of any of the  provisions  of this Lease or a
consent to any subletting, assignment or other transfer of the Demised Premises.

         25.10. If Tenant delivers to Landlord an Assignment Notice indicating a
desire to assign this Lease to an assignee other than as provided within Section
25.3,  then  Landlord  shall have the

                                       34
<PAGE>

option,  exercisable by giving notice to Tenant at any time within ten (10) days
after Landlord's receipt of the Assignment Notice, to terminate this Lease as of
the date specified in the Assignment  Notice as the Assignment Date. If Landlord
exercises  such  option,  then  Tenant  shall  have the right to  withdraw  such
Assignment Notice by delivery to Landlord written notice of such election within
five (5) days after  Landlord's  delivery of notice  electing  to exercise  such
option to  terminate.  In the event Tenant  withdraws the  Assignment  Notice as
herein above provided,  this Lease shall continue in full force and effect as if
such Assignment  Notice as herein above provided,  this Lease,  and the term and
estate herein granted,  shall terminate as of the Assignment Date. No failure of
Landlord to exercise any such option to terminate  this Lease shall be deemed to
be Landlord's consent to the proposed assignment.

         25.11. If Tenant shall sublet the Demised Premises or any part,  Tenant
hereby immediately and irrevocably assigns to Landlord, as security for Tenant's
obligations  under this Lease,  all rent from any subletting of all or a part of
the Demised  Premises,  and  Landlord as assignee  and as  attorney-in-fact  for
Tenant,  or a receiver  for Tenant  appointed  on  Landlord's  application,  may
collect  such rent and apply it toward  Tenant's  obligations  under this Lease;
except that, except during the continuation of a Default by Tenant, Tenant shall
have the right to collect such rent.

26.      Attorneys' Fees

         If either party commences an action against the other party arising out
of or in connection with this Lease,  the prevailing  party shall be entitled to
have and recover  from the  non-prevailing  party  reasonable  attorneys'  fees,
charges and  disbursements  and costs of suit and such reasonable fees,  changes
disbursements  and  costs  may be  included  in and as part of the  judgment  or
declaration resulting from such action.

27.      Bankruptcy

         27.1. In the event a debtor, trustee, or debtor in possession under the
Bankruptcy  Code, or other person with similar  rights,  duties and powers under
any other law,  proposes  to cure any  default  under this Lease or to assume or
assign this Lease, and is obliged to provide adequate assurance to Landlord that
(i) a default will be cured,  (ii) Landlord will be compensated  for its damages
arising from any breach of this Lease,  or (iii) future  performance  under this
Lease will  occur,  then  adequate  assurance  shall  include  any or all of the
following, as designated by Landlord:

                  27.1.1 Those acts  specified in the  Bankruptcy  Code or other
law as included  within the meaning of  adequate  assurance,  even if this Lease
does not concern a shopping center or other facility described in such laws;

                  27.1.2 A prompt cash  payment to  compensate  Landlord for any
monetary  defaults  or actual  damages  arising  directly  from a breach of this
Lease;

                                       35
<PAGE>

                  27.1.3 A cash  deposit  in an  amount  at  least  equal to the
Security Deposit as referenced in 2.1.8 originally required at time of execution
of this Lease.

                  27.1.4  The  assumption  or  assignment  of  all  of  Tenant's
interest and obligations under this Lease.

28.      Estoppel Certificate

         Tenant  shall  within ten (10) days of written  notice  from  Landlord,
execute,  acknowledge  and deliver a statement in writing  substantially  in the
form attached to this Lease as Exhibit "E" with the blanks filled in, and on any
other  form  reasonably  requested  by  a  proposed  lender  or  purchaser,  (i)
certifying  that this Lease is  unmodified  and in full force and effect (or, if
modified, stating the nature of such modification and certifying that this Lease
as so  modified  is in full force and  effect) and the dates to which the rental
and other charges are paid in advanced,  if any, (ii)  acknowledging  that there
are not, to  Tenant's  knowledge,  any uncured  defaults on the part of Landlord
hereunder,  or  specifying  such  defaults if any are claimed and (iii)  setting
forth  such  further  information  with  respect  to this  Lease or the  Demised
Premises as may be  reasonably  requested  thereon.  Any such  statement  may be
relied upon by any  prospective  purchaser or encumbrancer of all or any portion
of the real property of which the Demised Premises are a part.  Tenant's failure
or unreasonable refusal to deliver such statement within such time shall, at the
option of Landlord,  constitute a Default  under this Lease,  and, in any event,
shall be  conclusive  upon Tenant that the Lease is in full force and effect and
without modification except as may be represented by Landlord in any certificate
prepared by Landlord and delivered to Tenant for execution.

29.      [Intentionally Omitted.]

30.      Definition of Landlord; Limitation of Landlord's Liability

         30.1. The term "Landlord" as used in this Lease, so far as covenants or
obligations on the part of Landlord are concerned,  shall be limited to mean and
include only Landlord or the  successor-in-interest of Landlord under this Lease
at the  time in  question.  In the  event  of any  transfer,  assignment  or the
conveyance of Landlord's fee title or leasehold  interest,  the landlord  herein
named (and in case of any subsequent transfers or conveyances, the then grantor)
shall be  automatically  freed  and  relieved  from,  and after the date of such
transfer,  assignment or conveyance, of all liability for the performance of any
covenants or obligations  contained in this Lease  thereafter  accruing or to be
performed by Landlord and,  without  further  agreement,  the transferee of such
title or  leasehold  shall be deemed to have  assumed  and agreed to observe and
perform any and all  obligations of Landlord  hereunder  during its ownership or
ground lease of the Demised Premises.  Landlord may transfer its interest in the
Demised  Premises or this Lease  without the consent of Tenant and such transfer
or subsequent  transfer  shall not be deemed a violation on the part of Landlord
or the then grantor of any of the terms or conditions  of this 

                                       36
<PAGE>

Lease;  provided,  however that such  transferee  shall have delivered to Tenant
written confirmation of such transferee's  assumption of Landlord's  obligations
hereunder and receipt of the Security Deposit.

         30.2.  If Landlord is in default of this Lease,  and as a  consequence,
Tenant  recovers  a money  judgment  against  Landlord,  the  judgment  shall be
satisfied only out of the proceeds of sale received on execution of the judgment
and levy  against the right,  title and interest of Landlord in the Building and
Project,  and out of rent or other income from such real property  receivable by
Landlord  or out of the  consideration  received  by  Landlord  from  the  sale,
financing,  refinancing,  or other  disposition of all or any part of Landlord's
right, title, and interest in the Building and Project.

         30.3.  Landlord shall not be personally  liable for any deficiency.  If
Landlord is a partnership,  joint venture,  or limited  liability  company,  the
partners or members of such partnership or limited  liability  company shall not
be personally  liable and no partner or member of Landlord or limited  liability
company  shall be sued or named as a party in any suit or action or  service  of
process be made  against any partner of Landlord  except as may be  necessary to
secure  jurisdiction  of the  partnership  or joint  venture.  If  Landlord is a
corporation, the shareholders,  directors, officers, employees, and/or agents of
such corporation  shall not be personally  liable and no shareholder,  director,
officer,  employee or agent of Landlord shall be sued or named as a party in any
suit or action or service of process  made  against any  shareholder,  director,
officer,  employee  or agent of  Landlord.  No partner,  shareholder,  director,
employee, or agent of Landlord shall be required to answer or otherwise plead to
any service of process and no judgment will be taken or writ of execution levied
against any partner, shareholder, director, employee or agent of Landlord.

         30.4.  Each of the covenants and agreements of this Section 30 shall be
applicable to any covenant or agreement either expressly contained in this Lease
or imposed by statute or by common law and shall survive the termination of this
Lease.


31.      Project Control by Landlord

         31.1. Landlord reserves full control over the Project to the extent not
inconsistent with Tenant's  enjoyment of the Demised Premises.  This reservation
includes  but is not  limited  to right  of  Landlord  to  expand  the  Project,
subdivide the Project,  the right to grant easements and licenses to others, the
right to enter the Building and the right to maintain or establish  ownership of
the  Building  separate  from fee  title to the land on which  the  Building  is
located;  provided,  however,  that any expansion or  subdivision of the Project
shall not permanently and unreasonably  interfere with Tenant's access to or use
of the Demised  Premises and will not directly result in an increase to Tenant's
Pro Rata Share of Operating Costs of more than 5% without Tenant's prior written
consent, which shall not be unreasonably withheld, conditioned or delayed.

                                       37
<PAGE>

         31.2.  Landlord  further reserves the right to combine the Project with
any  other  project  in the area of the  Project  and owned by  Landlord  or its
affiliates;  provided,  however,  that any  combination of the Project shall not
permanently  and  unreasonably  interfere with Tenant's  access to or use of the
Demised  Premises  and will not  directly  result in an increase to Tenant's Pro
Rata Share of Operating  Costs of more than 5% without  Tenant's  prior  written
consent, which shall not be unreasonably withheld, conditioned or delayed.

         31.3.  Tenant shall,  should Landlord so request and of Landlord's sole
cost and expense for the reasonable  fees and costs incurred by Tenant  pursuant
thereto,  promptly join with  Landlord in execution of such  documents as may be
reasonably appropriate to assist Landlord to implement any such action, provided
that Tenant need not execute any document which is of nature  wherein  liability
is created in Tenant or, if by reason of the terms of such document, Tenant will
be deprived of the quiet enjoyment and use of the Demised Premises as granted by
this Lease.

         31.4. Landlord may, at any and all reasonable times during non-business
hours (or during  business  hours if Tenant so  requests),  and upon  reasonable
advance notice which, with respect to entry to Tenant's manufacturing facilities
shall be not less than  twenty-four  hours  (provided that no time  restrictions
shall apply or advance  notice  need be given if an  emergency  necessitates  an
immediate  entry),  enter the  Demised  Premises  to (a) inspect the same and to
determine  whether Tenant is in compliance with its obligations  hereunder,  (b)
supply any  service  Landlord is  required  to provide  hereunder,  (c) show the
Demised Premises to prospective  lenders,  insurers,  investors,  purchasers or,
during   the  last   year  of  the   Term,   tenants,   (d)  post   notices   of
nonresponsibility, (e) access the telephone equipment, electrical substation and
fire risers, and (f) alter,  improve or repair any portion of the Building which
Landlord  is  obligated  or  entitled  to repair  or  maintain.  Tenant  and its
designees  shall have the right to accompany  Landlord  personnel in  connection
with any entry upon the Demised  Premises,  and  Landlord  shall comply with all
other  reasonable  rules which Tenant may have in  connection  with any required
access. In connection with any such alteration,  improvement or repair, Landlord
may erect in the Demised  Premises or  elsewhere  in the Building or the Project
scaffolding  and  other  structures  reasonably  required  for  the  work  to be
performed.  In no event shall  Tenant's Rent abate as a result of any such entry
or work; provided, however, that all such work shall be done in such a manner as
to cause as little interference to Tenant as reasonably possible. Landlord shall
at all times  retain a key with which to unlock all of the doors in the  Demised
Premises. If an emergency necessitates immediate access to the Demised Premises,
Landlord may use whatever  force is necessary to enter the Demised  Premises and
any such entry to the  Demised  Premises  shall not  constitute  a  forcible  or
unlawful  entry to the Demised  Premises,  an  unlawful  detainer of the Demised
Premises,  or an eviction of Tenant  from the Demised  Premises,  or any portion
thereof.

32.      Quiet Enjoyment

                                       38
<PAGE>

         So long as Tenant is not in default,  Landlord  covenants that Landlord
or anyone acting through or under Landlord will not disturb  Tenant's  occupancy
of the Demised Premises except as permitted by the provisions of this Lease.

33.      Quitclaim Deed

         Tenant  shall  execute and deliver to  Landlord  on the  expiration  or
termination  of this Lease,  immediately  on Landlord's  request,  in recordable
form,  a  quitclaim  deed to the Demised  Premises  or such other  documentation
reasonably requested by Landlord evidencing termination of this Lease, which may
be recorded by Landlord at its sole cost and expense.

34.      Rules and Regulations

         Tenant  shall  faithfully  observe  and  comply  (and  shall  cause its
subtenants,  guests, invitees,  licensees,  agents, employees and contractors to
comply) with the Rules and Regulations and all reasonable and  nondiscriminatory
modifications thereof and additions thereto from time to time put into effect by
Landlord.   Neither  Landlord  nor  Tenant  (except  with  respect  to  Tenant's
subtenants,  guests,  invitees,  licensees,  agents,  employees and contractors)
shall be responsible for the violation or non-performance by any other tenant or
any agent, employee or invitee of Landlord of any of said Rules and Regulations.

35.      Subordination and Attornment

         35.1.  This Lease shall be subject and  subordinate  to the lien of any
mortgage,  deed of trust,  or lease in which Landlord is tenant now or hereafter
in force  against  the  Project  or the  Building  and to all  advances  made or
hereafter  to be made upon the  security  thereof  without the  necessity of the
execution  and  delivery  of any  further  instruments  on the part of Tenant to
effectuate such  subordination  provided,  however,  that as a condition to such
subordination, the lender must agree not to disturb Tenant's right of possession
upon and following a foreclosure sale so long as Tenant attorns to the lender or
new purchaser and Tenant is not in Default hereunder.

         35.2.  Notwithstanding the foregoing,  Tenant shall execute and deliver
upon demand such further instrument or instruments evidencing such subordination
of this Lease to the lien of any such mortgage or mortgages or deeds of trust or
lease in which  Landlord  is tenant as may be  reasonably  required  by Landlord
provided,  however,  that as a condition to such subordination,  the lender must
agree  not to  disturb  Tenant's  right  of  possession  upon  and  following  a
foreclosure  sale so long as Tenant  attorns to the lender or new  purchaser and
Tenant is not in default hereunder. However, if any such mortgagee,  beneficiary
or landlord under lease wherein  Landlord is tenant so elects,  this Lease shall
be deemed  prior in lien to any such lease,  mortgage,  or deed of trust upon or
including  the Demised  Premises  regardless  of date and Tenant will  execute a
statement in writing to such effect at  Landlord's  request.  If Tenant fails or
unreasonably  refuses to execute any document  reasonably  required  from Tenant
under this 


                                       39
<PAGE>

Section  within ten (10) days after  written  request  therefor,  Tenant  hereby
constitutes and appoints Landlord or its special attorney-in-fact to execute and
deliver any such  document  or  documents  in the name of Tenant.  Such power is
coupled with an interest and is irrevocable.

         35.3. In the event any proceedings are brought for  foreclosure,  or in
the event of the  exercise  of the power of sale under any  mortgage  or deed of
trust made by the Landlord  covering the Demised  Premises,  the Tenant shall at
the  election  of the  purchaser  at  such  foreclosure  or sale  attorn  to the
purchaser upon any such  foreclosure or sale and recognize such purchaser as the
Landlord under this Lease, so long as, with respect to a new purchaser, such new
purchaser  assumes all of Landlord's  obligations  under this Lease arising from
and after the date of such transfer.

36.      Surrender

         36.1. No surrender of  possession  of any part of the Demised  Premises
shall release Tenant from any of its  obligations  hereunder  unless accepted by
Landlord.

         36.2.  The  voluntary or other  surrender of this Lease by Tenant shall
not work a  merger,  unless  Landlord  consents  and  shall,  at the  option  of
Landlord,   operate  as  an  assignment  to  it  of  any  or  all  subleases  or
subtenancies.

         36.3.  The  voluntary or other  surrender  of any ground or  underlying
lease that now exists or may hereafter be executed affecting the Building or the
Project, or a mutual  cancellation,  thereof, or of Landlord's interest therein,
shall not work a merger and shall,  at the option of the successor of Landlord's
interest in the Building or Project, operate as an assignment of this Lease.

         36.4. Upon the expiration or earlier  termination of this Lease, Tenant
shall surrender the Demised Premises to Landlord broom clean and free of debris;
with all of Tenant's  property and effects removed therefrom except as otherwise
provided under Section 17.7 of this Lease;  with all  alterations,  improvements
and  fixtures  required by Landlord to be removed  from the Demised  Premises as
provided under Section 17.7 of this Lease  actually  removed and all damage as a
result of or caused by such removal repaired; and with all licenses, permits and
similar items which restrict or affect the used of the Demised Premises released
and fully terminated.

37.      Waiver and Modification

         No provision of this Lease may be modified,  amended or added to except
by an  agreement  in writing.  The waiver by Landlord of any breach of any term,
covenant or condition herein contained shall not be deemed to be a waiver of any
subsequent  breach of the same or any other term,  covenant or condition  herein
contained.

38.      Waiver of Jury Trial and Counterclaims

                                       40
<PAGE>

         THE PARTIES  HERETO SHALL AND THEY HEREBY DO WAIVE TRIAL BY JURY IN ANY
ACTION,  PROCEEDING  OR  COUNTERCLAIM  BROUGHT BY EITHER OF THE  PARTIES  HERETO
AGAINST  THE  OTHER  ON ANY  MATTERS  WHATSOEVER  ARISING  OUT OF OR IN ANY  WAY
CONNECTED WITH THIS LEASE, THE RELATIONSHIP OF LANDLORD AND TENANT, TENANT'S USE
OR OCCUPANCY OF THE DEMISED PREMISES, AND OR ANY CLAIM OF INJURY OR DAMAGE.

39.      [Intentionally omitted.]

40.      [Intentionally omitted.]

41.      Hazardous Materials

         41.1.  Prohibition/Compliance.  Tenant  shall not  cause or permit  any
Hazardous Materials (as hereinafter defined) to be brought upon, kept or used in
or about the Demised  Premises,  the  Building or the  Project in  violation  of
applicable law by Tenant,  its agents,  employees,  contractors or invitees.  If
Tenant  breaches the  obligation  stated in the  preceding  sentence,  or if the
presence  of  Hazardous  Materials  results  in  contamination  of  the  Demised
Premises, the Building, the Project or any adjacent property or if contamination
of the Demised Premises,  the Building,  the Project or any adjacent property by
Hazardous  Materials  otherwise  occurs  during  the  term of this  Lease or any
extension or renewal hereof or holding over hereunder, Tenant hereby indemnifies
and shall defend and hold Landlord, its officers,  directors,  employees, agents
and contractors harmless from any and all claims, judgments, damages, penalties,
fines, costs, liabilities, or losses (including, without limitation,  diminution
in value of the Demised  Premises or any portion of the building or the Project,
damages for the loss or restriction on use of rentable or usable space or of any
amenity of the Demised  Premises,  the Building or the Project,  damages arising
from any  adverse  impact on  marketing  of space in the Demised  Premises,  the
Building  or the  Project,  and sums paid in  settlement  of claims,  reasonable
attorneys'  fees,  consultant  fees and expert fees) which arise during or after
the  Lease  term as a result  of such  contamination.  This  indemnification  of
Landlord by Tenant includes,  without  limitation,  costs incurred in connection
with any investigation of site conditions or any cleanup, remedial,  removal, or
restoration work required by any federal,  state or local governmental agency or
political subdivision because of Hazardous Materials present in the air, soil or
ground  water  above on or under the  Demised  Premises.  Without  limiting  the
foregoing,  if the presence of any Hazardous  Materials on the Demised Premises,
the  Building,  the Project or any  adjacent  property,  caused or  permitted by
Tenant results in any contamination of the Demised Premises,  the Building,  the
Project or any adjacent property,  Tenant shall promptly take all actions at its
sole expense as are necessary to return the Demised Premises,  the Building, the
Project or any adjacent property, to the condition existing prior to the time of
such contamination, provided that Landlord's approval of such action shall first
be obtained,  which approval shall not  unreasonably be withheld so long as such
actions would not potentially have any material adverse  long-term or short-term
effect on the Demised Premises, the Building or the Project.

                                       41
<PAGE>

         41.2. Business. Landlord acknowledges that it is not the intent of this
Section 41 to prohibit  Tenant from  operating  its  business  as  described  in
Section 2.1.9 above.  Tenant may operate its business according to the custom of
the industry so long as the use or presence of  Hazardous  Materials is strictly
and properly monitored according to all applicable governmental requirements. As
a material  inducement to Landlord to allow Tenant to use Hazardous Materials in
connection with its business,  Tenant agrees to deliver to Landlord prior to the
Term Commencement Date a list identifying each type of Hazardous Materials to be
present on the  Demised  Premises  and  setting  forth any and all  governmental
approvals or permits  required in connection with the presence of such Hazardous
Materials on the Demised Premises  ("Hazardous  Materials  List").  Tenant shall
deliver to Landlord an updated Hazardous Materials List at least once a year and
shall also deliver an updated list before any new Hazardous Materials is brought
onto the Demised  Premises.  Tenant shall  deliver to Landlord  true and correct
copies of the following  documents (the  "Documents")  relating to the handling,
storage,  disposal  and  emission  of  Hazardous  Materials  prior  to the  Term
Commencement  Date, or if unavailable at that time,  concurrent with the receipt
from or submission to a governmental  agency:  permits;  approvals;  reports and
correspondence;  storage and management plans, notice of violations of any laws;
plans  relating to the  installation  of any storage tanks to be installed in or
under Building or the Project  (provided,  said installation of tanks shall only
be permitted after Landlord has given Tenant its written consent to do so, which
consent may be withheld in  Landlord's  sole and absolute  discretion);  and all
closure plans or any other documents required by any and all federal,  state and
local governmental  agencies and authorities for any storage tanks installed in,
on or under the  Building  or the  Project  for the  closure of any such  tanks.
Tenant is not required,  however, to provide Landlord with any portion(s) of the
Documents  containing  information  of a  proprietary  nature  which,  in and of
themselves,  do not contain a reference to any Hazardous  Materials or hazardous
activities.  It is not the  intent of this  Section  to  provide  Landlord  with
information  which  could  be  detrimental  to  Tenant's  business  should  such
information become possessed by Tenant's competitors.  At the written request of
Landlord,  Tenant agrees that it shall enter into a written agreement with other
tenant's at the Building  concerning  the  equitable  allocation of fire control
areas (as defined in the Uniform  Building  Code, and adopted by the City of San
Diego ("UBC"))  within the Building for the storage of Hazardous  Materials.  In
the event that Tenant's use of Hazardous Materials is such that it utilizes fire
control  areas in the  Building  in excess  of  Tenant's  Pro Rata  Share of the
Building as set forth in Section 2.1.6 above,  Tenant  agrees that it shall,  at
its own  expense,  and upon the  written  request  of  Landlord,  establish  and
maintain a separate area of the Demised  Premises or the Land  classified by the
UBC as an "H" occupancy area, for the use and storage of Hazardous Materials, or
take  such  other  action  so that its  share of the fire  control  areas of the
Building is not greater than Tenant's Pro Rata Share of the Building.

         41.3.  Termination of Lease.  Notwithstanding the provisions of Section
41.1 above,  if Tenant or the  proposed  assignee or  sublessee is subject to an
enforcement  order issued by any  governmental  authority in connection with the
continued use, disposal or storage of Hazardous  Materials in material violation
of any applicable  laws, (i) Landlord shall have the right, if Tenant 

                                       42

<PAGE>

has failed to comply with such  enforcement  order within thirty (30) days after
written  notice from  Landlord of such  non-compliance  (or, if such  failure to
comply  results in an imminent  threat to the health or safety of any tenants or
occupants  of the  Building or Project,  within  three (3)  business  days after
written notice from  Landlord),  to terminate this Lease in Landlord's  sole and
absolute  discretion (with respect to any such matter involving Tenant) and (ii)
it shall not be  unreasonable  for  Landlord  to  withhold  its  consent  to any
proposed  assignment or subletting  (with respect to any such matter involving a
proposed assignee or sublessee).

         41.4.  Testing.  At any  time,  and  from  time to time  (but  not more
frequently  than once in any calendar year unless Landlord  reasonably  believes
that a  hazardous  Materials  release  or  spill  has  occurred),  prior  to the
expiration or earlier  termination of the Term, Landlord shall have the right to
conduct appropriate tests of the Demised Premises,  the Building and the Project
to demonstrate  that  contamination  has occurred as a result of Tenant's use of
the Demised Premises.  Tenant shall be solely  responsible for and shall defend,
indemnify and hold the Landlord,  its agents and  contractors  harmless from and
against any and all claims,  costs and liabilities  including actual  attorneys'
fees,  charges  and  disbursements,  arising  out of or in  connection  with any
removal,  clean up,  restoration and materials  required hereunder to return the
Demised  Premises and any other property of whatever  nature to their  condition
existing prior to the time of any such  contamination.  Tenant shall pay for the
cost of the tests of the Demised Premises.

         41.5.  Underground Tanks. If underground or other storage tanks storing
Hazardous  Materials are located on the Demised Premises or are hereafter placed
on the Demised  Premises by any party,  Tenant shall monitor the storage  tanks,
maintain appropriate records, implement reporting procedures, properly close any
underground  storage  tanks,  and  take or cause to be  taken  all  other  steps
necessary  or  required  under the  California  Administrative  Code,  Title 23,
Chapter 3, Subchapter 16,  "Underground  Storage Tank Regulations," and Division
20, Chapter 6.7 of the California Health & Safety Code,  "Underground Storage of
Hazardous Substances," as they now exist or may hereafter be adopted or amended.

         41.6. Tenant's Obligations.  Tenant's obligations under this Section 41
shall survive the  expiration or earlier  termination  of the Lease.  During any
period of time  employed by Tenant or  Landlord  after the  termination  of this
Lease to complete  the removal from the Demised  Premises of any such  Hazardous
Materials and the release and termination of any licenses or permits restricting
the use of the Demised  Premises,  Tenant shall continue to pay the full Rent in
accordance with this Lease, which Rent shall be prorated daily.

         41.7.  Definition of "Hazardous  Materials."  As used herein,  the term
"Hazardous Materials" means any hazardous or toxic substance,  material or waste
which is or becomes regulated by any local governmental authority,  the State of
California or the United States government and includes, without limitation, any
material or substance  which is (i) defined as a "hazardous  waste, " "extremely
hazardous  waste" or "restricted  hazardous waste" under Section 25515 or 25117,
or listed pursuant to Section 25140,  of the California  Health and Safety Code,
Division  20,  Chapter 6.5  (Hazardous  Waste  Control  Law),  (ii) Defined as a
"hazardous
                                       43
<PAGE>

substance"  under  Section  25316 of the  California  Health  and  Safety  Code,
Division 2, Chapter 6.8  (Carpenter-Presly-Tanner  Hazardous  Substance  Account
Act),  (iii)  defined  as  a  "hazardous  material,"  "hazardous  substance"  or
"hazardous  waste" under Section 25501 of the California Health and Safety Code,
Division 20, Chapter 6.95 (Hazardous Substances),  (v) petroleum, (vi) asbestos,
(vii)  listed under  Article 9 and defined as  hazardous or extremely  hazardous
pursuant  to  Article  11 of Title  22 of the  California  Administrative  Code,
Division 4, Chapter 20, (viii) designated as a "hazardous substance" pursuant to
Section 311 of the Federal Water Pollution Control Act (33 U.S.C. Section 1317),
(ix)  defined as a  "hazardous  waste"  pursuant to Section  1004 of the Federal
Resource  Conversation  and Recovery Act, 42 U.S.C.  Section 6901,  et. seq. (42
U.S.C.  Section  6903),  or (x) defined as a "hazardous  substance"  pursuant to
Section  101  of  the  Comprehensive  Environmental  Response  Compensation  and
Liability Act, 42 U.S.C. Section 9601 et. seq. (42 U.S.C. Section 9601).

42.      Option to Extend Term.

         Tenant  shall  have the option to extend the term of the Lease upon the
following terms and conditions:

         42.1.  Tenant  shall  have  five  (5)  consecutive  options  (each,  an
"Extension  Option")  to extend  the term of this  Lease for five (5) years each
(each,  an  "Extension  Term") on the same  terms and  conditions  as the Lease.
During any Extension Term, Basic Annual Rent shall be payable at the Market Rate
(as defined  below),  but in no event less than the Basic Annual Rent payable on
the date immediately preceding the commencement such Extension Term, as adjusted
pursuant  to  Section 6 hereof.  Basic  Annual  Rent  shall be  adjusted  on the
commencement of each Extension Term and on each one (1) year  anniversary of the
commencement such Extension Term in accordance with Section 6 above.

         42.2.  Extension Options are personal to Matrix  Pharmaceuticals,  Inc.
and its corporate successors and are not assignable separate and apart from this
Lease.

         42.3.  Extension  Options are  conditional  upon Tenant giving Landlord
written  notice of its election to exercise each  Extension  Option at least one
(1) year prior to the end of the  expiration of the initial term of the Lease or
the expiration of any Extension Term.

         42.4.  Notwithstanding  anything  set  forth  above  to  the  contrary,
Extension  Options shall not be in effect and Tenant may not exercise any of the
Extension Options:

                  42.4.1  during  any  period of time that  Tenant is in default
under any provision of this Lease; or

                  42.4.2 if Tenant has been in default  under any  provision  of
this  Lease  three (3) or more  times,  whether or not the  defaults  are cured,
during the twelve (12) month  period  immediately  prior to the date that Tenant
intends to exercise an Extension Option, whether or not 

                                       44
<PAGE>

the defaults are cured.

         42.5.  The  period of time  within  which any  Extension  Option may be
exercised shall not be extended or enlarged by reason of the Tenant's  inability
to exercise  the  Expansion  Option  because of the  provisions  of Section 42.4
above.

         42.6. The Extension  Option shall  terminate and be of no further force
or effect even after  Tenant's due and timely  exercise of an Extension  Option,
if,  after such  exercise,  but prior to the  commencement  date of an Extension
Term, (1) Tenant fails to timely cure any default by Tenant under this Lease; or
(2) Tenant has defaulted three (3) or more times during the period from the date
of the exercise of an Extension  Option to the date of the  commencement  of the
Extension Term, whether or not such defaults are cured.

         42.7.  As used herein,  "Market Rate" shall mean the price that a ready
and willing tenant would pay, at  commencement of the Extension term, as monthly
base rent to a ready and willing  landlord if such space were  offered for lease
on the open  market for a  reasonable  period of time and be the sum of the fair
market monthly rental rate per rentable  square foot  multiplied by the Rentable
Area of the Premises  determined as follows:  (a) as mutually agreed by Landlord
and Tenant within ten (10) days of  Landlord's  delivery to Tenant of Landlord's
opinion of the Market Rate for the first year of the Extension  term  ("Landlord
Rent Notice")(which shall be delivered to Tenant within ten (10) days of receipt
of Tenant's  written  Extension  Notice);  or (b) in the event that Landlord and
Tenant are unable to so agree  within such ten (10) day period,  the Market Rate
shall be determined  by  concurrent  appraisals  pursuant to  subparagraph  42.8
below.  The Market Rate shall be determined by  considering  (i) the highest and
best use of the  Premises,  (ii) the duration of the Extension  Term,  (iii) the
quality  and  prestige of the  Premises  (as then  improved  and  maintained  as
required by the terms and conditions of this Lease),  (iv) recent monthly rental
rates for  buildings of similar size and  location,  (v)  anticipated  CPI Index
changes from the date of the Market Rate determination to the date of the actual
Extension  term  commencement;  (vi) all other  relevant terms and conditions of
this Lease;  provided,  however,  that in no event shall the Market Rate be less
than the  Basic  Annual  Rent  payable  on the date  immediately  preceding  the
commencement such Extension Term, as adjusted pursuant to Section 6 hereof.

         42.8.  In the event that  Landlord  and Tenant are unable to agree upon
the Market rate within the required  ten (10) day period  described  above,  the
Market Rate shall be determined as follows:

                  42.8.1 If Tenant  rejects the Market Rate proposed by Landlord
in  Landlord's  Rent Notice,  Landlord and Tenant shall attempt to agree in good
faith upon a single  appraiser  not later than five (5) days after the  Landlord
receives  notice of  Tenant's  rejection  of  Landlord's  proposed  Market  Rate
("Tenant's  Rejection  Notice"),  which date of receipt shall be within ten (10)
days of Landlord's  delivery of Landlord's  Rent Notice.  If Landlord and Tenant
are  unable to agree  upon a single  appraiser  within  such time  period,  then
Landlord  and Tenant shall each  appoint one  appraiser  not later than ten (10)
days after Landlord's receipt of Tenant's Rejection Notice. 

                                       45
<PAGE>

Within five (5) days  thereafter,  the two appointed  appraisers shall appoint a
third appraiser. Landlord and Tenant shall instruct the appraiser(s) to complete
the  determination of the Market Rate not later than fifteen (15) days after all
appraisers have been appointed.

                  42.8.2  If either  Landlord  or Tenant  fails to  appoint  its
appraiser  within the prescribed  time period,  the single  appraiser  appointed
shall  determine  the  Market  Rate of the  Premises  for the first  year of the
Extension Term. If both parties fail to appoint appraisers within the prescribed
time  periods,  then the first  appraiser  thereafter  selected by a party shall
determine  the Market Rate of the Premises  for the first year of the  Extension
Term.

                  42.8.3 Landlord and Tenant shall each bear the cost of its own
appraiser  and the parties  shall share  equally the cost of the single or third
appraiser,  if  applicable.  All  appraisers so designated  herein shall have at
least five (5) years' experience in the appraisal of similar office buildings in
the San Diego area and shall be members of  professional  organizations  such as
MAI or equivalent.

                  42.8.4 If a single  appraiser is chosen,  then such  appraiser
shall determine the Market Rate of the Premises for the first year of the Option
Term.  Otherwise,  the  Market  Rate of the  Premises  for the first year of the
Option Term shall be the  arithmetic  average of (2) of the three (3) appraisals
which are closest in amount, and the third appraisal shall be disregarded.

43.      Right of First Offer to Purchase.

         Tenant  shall  have a right of first  offer (the  "Purchase  Right") to
purchase the Building upon the following terms and conditions:

         43.1. In the event that Landlord desires to sell the Building,  no less
than ten (10) days prior to actively  marketing  the  Building,  Landlord  shall
deliver to Tenant  written  notice (the "Sale  Notice") of Landlord's  intent to
sell the Building,  together with the terms and conditions  under which Landlord
is  prepared to sell the  Building.  Tenant  shall have ten (10) days  following
delivery  of the Sale  Notice to deliver to  Landlord  written  notification  of
Tenant's  exercise of the Purchase  Right upon the terms and  conditions  of the
Sale Notice.  In the event Tenant fails to timely deliver such notice,  or if on
the date  which is thirty  (30)  days  after the  delivery  of the Sale  Notice,
Landlord  and Tenant have failed to agree upon any of the terms of the  purchase
agreement  for the Building  after  negotiating  in good faith,  Tenant shall be
deemed to have  waived any right to  purchase  the  Building  and  Landlord  may
thereafter  sell the  Building  to any third party free of the  Purchase  Right;
provided,  however,  that in the event  Tenant does not  purchase  the  Building
following timely exercise of the Purchase Right due to a failure of Landlord and
Tenant to agree upon the terms of the  purchase  agreement,  any  purchaser  who
subsequently  acquires title to the Building shall acquire such title subject to
the Purchase Right and Tenant's rights in connection therewith.

         43.2.  In the event  that  Tenant  and  Landlord  enter into a purchase
agreement  following 

                                       46
<PAGE>

the timely exercise of the Purchase Right, the purchase and sale of the Building
shall close no sooner than the date which is nine (9) months,  and no later than
the date which is twelve (12) months,  following receipt by Landlord of Tenant's
election to exercise the Purchase Right.

         43.3.  Notwithstanding  the above,  the Purchase  Right shall not be in
effect and may not be exercised by Tenant  during any period of time that Tenant
is in  Default  under  any  provision  of the  Lease  (provided,  however,  that
notwithstanding  the  foregoing  Tenant may, as a condition  to  exercising  the
Purchase  Right,  cure any  Default  due to failure to any Rent or other sum due
Landlord).

         43.4.  The Purchase Right is personal to Matrix  Pharmaceuticals,  Inc.
and its corporate  successors and may not be transferred separate and apart from
this Lease or to any other person or entity (including,  without limitation, any
successor tenant).

         43.5. The Purchase Right shall  terminate and be of no further force or
effect upon the expiration or earlier termination of the Term.

         43.6. The Purchase Right shall  terminate and be of no further force or
effect even after Tenant's due and timely  exercise of the Purchase  Right,  if,
after such  exercise,  but prior to the closing of the  purchase and sale of the
Building,  (1) Tenant fails to timely cure any Default by Tenant under the Lease
(provided,  however,  that  notwithstanding  the  foregoing  Tenant  may,  as  a
condition  to the closing of the  purchase  and sale of the  Building,  cure any
Default due to failure to any Rent or other sum due Landlord); or (2) Tenant has
defaulted three (3) or more times, whether or not such Defaults are cured.

44.      Miscellaneous

         44.1. Terms and Headings.  Where applicable in this Lease, the singular
includes the plural and the masculine or neuter includes the masculine, feminine
and neuter.  The section headings of this Lease are not a part of this Lease and
shall have no effect upon the construction or interpretation of any part hereof.

         44.2.   Examination  of  Lease.   Submission  of  this  instrument  for
examination  or signature  by Tenant does not  constitute  a  reservation  of or
option  for  lease,  and it is not  effective  as a  lease  or  otherwise  until
execution by and delivery to both Landlord and Tenant.

         44.3.  Time.  Time is of the essence with respect to the performance of
every provision of this Lease in which time of performance is a factor.

         44.4.   Covenants  and   Conditions.   Each  provision  of  this  Lease
performable by Tenant shall be deemed both a covenant and a condition.

         44.5.  Consents.  Whenever  consent  or  approval  of  either  party is
required,  that party 

                                       47
<PAGE>

shall not  unreasonably  withhold  such  consent or  approval,  except as may be
expressly set forth to the contrary.

         44.6.  Entire  Agreement.  The terms of this Lease are  intended by the
parties as a final  expression of their  agreement  with respect to the terms as
are included  herein,  and may not be  contradicted  by evidence of any prior or
contemporaneous agreement. The Exhibits are incorporated into this Lease and the
Lease and the Exhibits constitute a single document.

         44.7. Severability.  Any provision of this Lease which shall provide to
be invalid, void, or illegal in no way affects, impairs or invalidates any other
provision  hereof,  and such  other  provisions  shall  remain in full force and
effect.

         44.8.  Recording.  Either  party may,  but shall not be  obligated  to,
record a short form  memorandum  hereof upon  reasonable  advance  notice to the
other party,  which shall be executed in  recordable  form and otherwise in form
satisfying to Landlord  within ten (10) business days after receipt of the other
party's  written  request  therefor.  Neither  parties  shall record this Lease.
Tenant shall be  responsible  for the cost of recording any Memorandum of Lease,
including  any  transfer  or  other  taxes  incurred  in  connection  with  said
recordation.

         44.9. Impartial  Construction.  The language in all parts of this Lease
shall be in all cases construed as a whole according to its fair meaning and not
strictly for or against either Landlord or Tenant.

         44.10.  Inurement.  Each of the  covenants,  conditions  and agreements
herein contained shall inure to the benefit of and shall apply to and be binding
upon  the  parties  hereto  and  their  respective  heirs,  legatees,  devisees,
executors,  administrators,  successors,  assigns, sublessees, or any person who
may come into  possession  of said  Demised  Premises or any part thereof in any
manner  whatsoever.  Nothing in this Section  43.10  contained  shall in any way
alter the provisions against assignment or subletting in this Lease provided.

         44.11. Notices. Any notice, consent,  demand, bill, statement, or other
communication required or permitted to be given hereunder must be in writing and
may be given by personal delivery,  reputable  overnight courier or by mail, and
if given by mail shall be deemed sufficiently given two (2) days after time when
deposited in United States Mail is sent by registered or certified  mail, and if
given by other means shall be deemed given when received, addressed to Tenant or
Landlord at the addresses shown in Sections 2.1.10 and 2.1.11 of the Basic Lease
Provisions.  Either  party may,  by notice to the other  given  pursuant to this
Section, specify additional or different addresses for notice purposes.

         44.12. Jurisdiction. This Lease has been negotiated and entered into in
the State of  California  and shall be governed  by,  construed  and enforced in
accordance  with the laws of the State of California,  applied to contracts made
in California to be wholly performed in California.

         44.13.  Authority.  That individual or those  individuals  signing this
Lease guarantee,  

                                       48
<PAGE>

warrant  and  represent  that said  individual  or  individuals  have the power,
authority  and legal  capacity  to sign this  Lease on behalf of and to bind all
entities,  corporations,  partnerships,  joint venturers or other  organizations
and/or entities on whose behalf said individual or individuals have signed.

         IN WITNESS  WHEREOF,  the parties hereto have executed this Lease as of
the date first above written.

                                    Landlord:

                                    ARE - 4757 NEXUS CENTRE, LLC,
                                    a Delaware limited liability company

                                    By:  Alexandria Real Estate Equities,  L.P.,
                                         a   Delaware    limited    partnership,
                                         managing member

                                         By: ARE-QRS     Corp.,    a    Maryland
                                             corporation, general partner


                                               By:  /s/ Joel S. Marcus
                                                    ----------------------------
                                                    Name: Joel S. Marcus
                                                          ----------------------
                                                    Its: Chief Executive Officer
                                                         -----------------------





                                     Tenant:

                                     MATRIX PHARMACEUTICAL, INC.,
                                     a Delaware corporation


                                     By: /s/ Ronald P. Lucas
                                         -----------------------------
                                     Name: Ronald P. Lucas
                                           ---------------------------
                                     Its: Vice President of Operations
                                          ----------------------------

                                       49

<PAGE>

                                    EXHIBITS

            EXHIBIT "A"       LAND
            
            EXHIBIT "B"       PROJECT
            
            EXHIBIT "C"       RULES AND REGULATIONS
            
            EXHIBIT "D"       TENANT'S PERSONAL PROPERTY
            
            EXHIBIT "E"       ESTOPPEL CERTIFICATE
            



                                       50
<PAGE>



                                   Exhibit "A"

                                      LAND

                  Parcel 1 of Parcel Map 17892, in the City of San Diego, County
of San Diego,  State of California,  according to Map filed in the Office of the
County Recorder of San Diego County on August 6, 1997.



                                       A-1

<PAGE>


                                   Exhibit "B"

                                     PROJECT


                  Parcels 1 and 2 of Parcel Map 17892, in the City of San Diego,
County of San Diego,  State of California,  according to Map filed in the Office
of the County Recorder of San Diego County on August 6, 1997.



                                      B-1

<PAGE>

                                   EXHIBIT "C"

                              RULES AND REGULATIONS


                                       -1-

         No  awnings  shall be  attached  to the  outside  walls of the  Demised
Premises or Building.

                                       -2-

         Tenant shall not install any  loudspeaker  or other devices on the roof
or  exterior  walls of the  Demised  Premises  or  Building.  Tenant  shall  not
interfere  with  radio or  television  broadcasting  or  reception  outside  the
Building from or in the Premises.

                                       -3-

         The sashes,  sash doors,  skylights,  windows and doors that reflect or
admit light and air into the halls,  passageways  or other public  places in the
Demised  Premises or Building shall not be covered or obstructed,  nor shall any
bottles,  parcels or other  articles be placed on the  windowsills.  Neither the
interior  nor  the  exterior  of  any  windows  shall  be  coated  or  otherwise
sunscreened without Landlord's prior written consent.

                                       -4-

         With the exception of signage existing on the Term  Commencement  Date,
no sign,  advertisement  or notice  shall be  exhibited,  painted  or affixed by
Tenant on any part of, so as to be seen from the outside of the Building without
Landlord's  prior  written  consent.  In the event of Tenant's  violation of the
foregoing, Landlord may remove the same without any liability and may charge the
expense incurred in such removal to Tenant.

                                       -5-

         Tenant  shall  store all of its trash and  garbage  within the  Demised
Premises or in other facilities provided by Landlord.  Tenant shall not place in
any trash box or  receptacle  any  material  which  cannot be disposed of in the
ordinary and customary manner of trash and garbage disposal.

                                       -6-

         Tenant  assumes any and all  responsibility  for protecting the Demised
Premises or Building from theft,  robbery and pilferage,  which includes keeping
doors  locked and other  means of entry into the  Demised  Premises  or Building
closed.

                                       -7-

         Landlord  shall  have card key  access to the  Building  for  emergency
purposes. Tenant must, upon the termination of its tenancy, give to Landlord all
keys  pertaining to the Demised  Premises and the Building,  and in the event of
the  loss of any  keys so  furnished,  Tenant  shall  pay  Landlord  the cost of
replacing  same or of changing  the lock or locks  opened by such lost key(s) if
Landlord shall deem it necessary to make such change.

                                       -8-

         No windows or other air  conditioning or heating units or other similar
apparatus shall be installed or used by Tenant without  Landlord's prior written
consent.

                                       -9-

         The water and wash  closets and other  plumbing  fixtures  shall not be
used for any  purpose  other than those for which they were  constructed  and no
sweepings,  rubbish,  rags or other  substances  shall be  thrown  therein.  All
damages  resulting  from any misuse of the  fixtures by Tenant of its  servants,
employees, agents, visitors or licensees shall be borne by Tenant


                                       1
<PAGE>


                                      -10-

         Landlord  reserves  the right to  inspect  all safes or other  heavy or
bulky  equipment or articles,  the weight of which may exceed the floor load for
which the Building is designed, or such equipment or articles as may violate any
of the provisions of the Lease of which these Rules and  Regulations are a part.
Tenant  shall not use any  machinery  or other  bulky  articles  in the  Demised
Premises or Building,  which by its weight might injure the floor of the Demised
Premises or Building.

                                      -11-

         Neither  Tenant  nor  its  servants,  employees,  agents,  visitors  or
licensees shall at any time bring or keep upon the Demised  Premises or Building
any flammable, combustible or explosive fluid, chemical or substance, except for
a reasonable quantity of such material  reasonably  necessary for the conduct of
Tenant's trade or business.

                                      -12-

         Tenant shall not, without  Landlord's prior written consent,  occupy or
permit any  portion of the  Demised  Premises or Building to be occupied or used
for other than as provided under Section 2.1.9. The Demised Premises or Building
shall not be used for lodging or sleeping.

                                      -13-

         Tenant shall not make, or permit to be made, any unseemly or disturbing
noises, or disturb or interfere with neighboring  buildings or premises or those
having business with it by the use of any musical instrument, radio, phonographs
or  unusual  noise,  or in any  other  way.  Neither  Tenant  nor its  servants,
employees,  agents,  visitors or  licensees  shall throw  anything out of doors,
windows or skylights or down the passageways.

                                      -14-

         No birds or non-laboratory animals of any kind shall be brought into or
kept in or about the Demised Premises or Building except as required pursuant to
the  American  with  Disabilities  Act (ADA),  and no  cooking  shall be done or
permitted  by Tenant in its  Premises,  except  that  provided  for in  Tenant's
cafeteria (or similar facility), if any, for the preparation of coffee, tea, hot
chocolate,  pastries, sandwiches and similar microwaveable items for Tenant, its
employees  and  visitors.  Tenant  shall  nor  cause or permit  any  unusual  or
objectionable odors to emanate from the Building.

                                      -15-

         Except in Tenant's  lunch room,  no vending or coin  operated  machines
shall be placed within the Demised Premises or Building without Landlord's prior
written consent.


                                       2
<PAGE>


                                      -16-

         Landlord  shall have the right to prohibit  any  advertising  by Tenant
which, in Landlord's  opinion,  tends to impair the reputation of the Project or
its desirability as an office/laboratory  building, and upon written notice from
Landlord, Tenant shall refrain from or discontinue such advertising.  Nothing in
this  provision,  however,  shall be construed to prevent Tenant from installing
reasonable  signage at the Building  identifying Tenant provided such signage is
located at a place and is of a size and is constructed of a material  acceptable
to Landlord.

                                      -17-

         Canvassing,  soliciting and peddling in the Building are prohibited and
Tenant shall cooperate to prevent same.

                                      -18-

         Landlord  reserves  the  right to  exclude  or expel  from the  Demised
Premises or Building any person who, in the judgment of Landlord, is intoxicated
or under the influence of liquor or drugs, or who shall in any manner do any act
in violation of the Rules and Regulations of the Building.

                                      -19-

         Landlord  and Tenant agree that there shall be no consent to any waiver
of any of these Rules or  Regulations  unless said waiver is done in writing and
acknowledged by Landlord and Tenant.

                                      -20-

         Landlord reserves the right at any time to change or rescind any one or
more of these Rules or Regulations, or to make such other and further reasonable
Rules and Regulations as in Landlord's reasonable judgment may from time to time
be necessary for the  management,  safety,  care and  cleanliness of the Demised
Premises or Building, and for the preservation of good order therein, as well as
for the  convenience  of other  occupants and tenants of the Building.  Landlord
shall not be  responsible  to  Tenant  herein  or to any  other  person  for the
non-observance of the Rules and Regulations by any other tenant or other person.
Tenant  shall be deemed to have read  these  Rules and  Regulations  and to have
agreed to abide by them as a condition to its occupancy of the Demised  Premises
and Building.

                                      -21-

         These  Rules  and  Regulations  are in  addition  to,  and shall not be
construed  to in any way  modify  or  amend,  in whole or in  part,  the  terms,
covenants, agreements and conditions of Tenant's lease of its Premises.

                                      -22-

         Tenant shall be responsible  for the observance of all of the foregoing
Rules  and  Regulations  by  Tenant's  employees,  agents,  clients,  customers,
invitees and guests.


                                       3
<PAGE>


                                  Exhibit "D"

                           EXCLUDED PERSONAL PROPERTY
                           --------------------------

                 4757 NEXUS CENTRE DRIVE, SAN DIEGO, CALIFORNIA

 ITEM                  DESCRIPTION                             QTY.    LOCATION

  1      All conference room furniture and chairs
  2      All lab stools and chairs
  3      All laboratory equipment and glassware
  4      All lunch room furniture and chairs
  5      All manufacturing process equipment
  6      All office cubicle furniture and chairs
  7      All patio furniture and chairs
  8      All plug-in refrigerators and freezers
  9      All stand-alone corrosive cabinets
 10      All stand-alone flammable cabinets
 11      Amsco single door autoclave                            1      117
 12      Baker Edgegard Hood                                    1      188
 13      Baker Edgegard Hood E6552                              1
 14      Baker Stenigard Hood                                   1      118
 15      Bike Lockers                                           1
 16      BioChem Garb Hood BC-6                                 1      147
 17      BloChem Garb Hood BC-8                                 1      147
 18      BioKlone 2 bio-contamination hood                      1      143
 19      Captair Labx Ductless Filtration Hood                  1      152
 20      Continental 2-door refrigerator                        1      143
 21      Continental 3-door refrigerator (MEIN 11537)           1      115
 22      Continental refrigerator w/wheels                      1      117
 23      Forklift-Komatsu                                       1
 24      Forma incubator, large, model 3919                     2      143
 25      Forma incubator, small, model 3546                     3      143
 28      Gallenkamp oven                                        1
 27      Gelman Filter Housing                                  3
 28      Hamilton SafeAir Hood                                  1      143
 29      Hazardous materials storage                            5      Outside
 30      Mobile laminar flow hood                               3


<PAGE>

                                  Exhibit "D"

                           EXCLUDED PERSONAL PROPERTY
                           --------------------------

                 4757 NEXUS CENTRE DRIVE, SAN DIEGO, CALIFORNIA

ITEM                  DESCRIPTION                              QTY.    LOCATION

 31      Portable particle counter- Met one                     1
 32      Refrigerator recovery unit (maint. tool)               1
 33      Remote particle counter - Met One                     12
 34      Scotsman Icemaker (E-144)                              1      117
 35      Signage for Reception Area
 38      Stainless steel racks
 37      Stainless steel trays                                  1
 38      Sterilizer, Kuhlman                                    1
 39      Storage Trailers                                       2      Outside
 40      Telephone System (Siemens)


<PAGE>
                                  Exhibit "E"

                              ESTOPPEL CERTIFICATE

         THIS TENANT ESTOPPEL CERTIFICATE ("Certificate"), dated as of ________,
19__, is executed by _____________ ("Tenant") in favor of Alexandria Real Estate
Equities,  Inc., a Maryland corporation,  together with its nominees,  designees
and assigns (collectively,  "Buyer"),  and in favor of _______________  together
with its nominees, designees and assigns (collectively, "Lender").

                                    RECITALS

         A. Buyer and _____________ ("Landlord"), have entered into that certain
Purchase  and  Sale  Agreement  and  Joint  Escrow  Instructions,  dated  as  of
_________,  19__  (the  "Purchase  Agreement"),  whereby  Buyer  has  agreed  to
purchase,  among other things, the improved real property located in the City of
_________, County of _________, State of __________, more particularly described
on Exhibit "A" attached to the Purchase Agreement (the "Property").

         B. Tenant and Landlord have entered into that certain Lease  Agreement,
dated  as  of  ___________   (together  with  all   amendments,   modifications,
supplements, guarantees and restatements thereof, the "Lease"), for a portion of
the Property.

         C.  Pursuant  to the Lease,  Tenant has agreed that upon the request of
Landlord,  Tenant would execute and deliver an estoppel  certificate  certifying
the status of the Lease.

         D. In connection  with the Purchase  Agreement,  Landlord has requested
that Tenant execute this Certificate with an understanding that Lender will rely
on the representations and agreements below in granting to Buyer a loan.

         NOW, THEREFORE, Tenant certifies, warrants, and represents to Buyer and
Lender as follows:

         Section 1. Lease.


<PAGE>

         Attached hereto as Exhibit "1" is a true,  correct and complete copy of
the Lease,  including  the  following  amendments,  modifications,  supplements,
guarantees  and  restatements  thereof,  which  together  represent  all  of the
amendments,  modifications,  supplements,  guarantees and restatements  thereof:
________________________________________________________________________________
_______________________________________________________________________________.
(If none, please state "None.")

        Section 2. Leased Premises.

         Pursuant  to the Lease,  Tenant  leases  those  certain  premises  (the
"Leased  Premises")  consisting  of  approximately   ________________   (______)
rentable square feet within the Property, as more particularly  described in the
Lease.  In  addition,  pursuant  to the  terms  of the  Lease,  Tenant  has  the
[non-exclusive]  right to use [_____ parking spaces/the parking area] located on
the Property during the term of the Lease.  [Cross-out the preceding sentence or
portions thereof if inapplicable.]

        Section 3. Full Force of Lease.

         The Lease has been duly  authorized,  executed and delivered by Tenant,
is in full force and effect has not been  terminated  and  constitutes a legally
valid instrument,  binding and enforceable against Tenant in accordance with its
terms,  subject  only to  applicable  limitations  imposed by laws  relating  to
bankruptcy and creditor's rights.

        Section 4. Complete Agreement.

         The Lease  constitutes  the  complete  agreement  between  Landlord and
Tenant for the Leased Premises and the Property, except as modified by the Lease
amendments noted above (if any), has not been modified, altered or amended.

        Section 5. Acceptance of Leased Premises.

         Tenant has accepted  possession  and is currently  occupying the Leased
Premises.

        Section 6. Lease Term.


                                       2
<PAGE>

        The  term  of  the  Lease  commenced  on  _______________  and  ends  on
_______________, subject to the following options to extend:____________________
____________________________________________________________________.
(If none, please state "None.")

        Section 7. Purchase Rights.

        Tenant has no option,  right of first refusal,  right of first offer, or
other right to acquire or purchase all or any portion of the Leased  Premises or
all or any portion of, or interest in, the Property, except as follows:_________
________________________________________________________________________________
______________________.
(If none, please state "None.")

        Section 8. Rights of Tenant.

        Except as expressly stated in this Certificate, Tenant:

        (a) has no right to renew or extend the term of the Lease;

        (b) has no  option  or other  right to  purchase  all or any part of the
Leased Premises or all or any part of the Property;

        (c) has no right, title, or interest in the Leased Premises,  other than
as Tenant under the Lease.

        Section 9. Rent.

        (a) The obligation to pay rent under the Lease commenced on ___________.
The rent  under the  Lease is  current,  and  Tenant  is not in  default  in the
performance of any of its obligations under the Lease.

         (b) Tenant is currently  paying base rent under the Lease in the amount
of _____________________  Dollars ($________) per month. Tenant has not received
and is not, presently,  entitled to any abatement, refunds, rebates, concessions
or forgiveness of rent or other  charges,  free rent,  partial rent, or credits,
offsets or reductions in rent, except as follows: ______________________________
________________________________________________________________________________
___________________________.


                                       3
<PAGE>

(If none, please state "None.")

        (c) Tenant's estimated share of operating expenses, common area charges,
insurance,  real  estate  taxes and  administrative  and  overhead  expenses  is
___________  percent  (_______%)  and is  currently  being  paid at the  rate of
_______________________ Dollars ($________) per month, payable to:______________
____________________________________________________________________.

        (d) There are no  existing  defenses or offsets  against  rent due or to
become due under the terms of the Lease,  and there  presently  is no default or
other  wrongful  act or  omission by Landlord  under the Lease or  otherwise  in
connection with Tenant's occupancy of the Leased Premises,  nor is there a state
of facts  which  with the  passage of time or the giving of notice or both could
ripen into a default on the part of Tenant,  or to the best knowledge of Tenant,
could  ripen into a default on the part of Landlord  under the Lease,  except as
follows: _______________________________________________________________________
________________________________________________________________________________
_______________________________________________________________________________.
(If none, please state "None.")

        Section 10. Security Deposit.

        The amount of Tenant's security deposit held by Landlord under the Lease
is ___________________ Dollars ($ ___________

        Section 11. Prepaid Rent.

         The amount of prepaid  rent,  separate  from the security  deposit,  is
___________________________  Dollars ($_______), covering the period from ______
to ______.

        Section 12. Insurance.

        All  insurance,  if any,  required to be  maintained by Tenant under the
Lease is presently in effect.

        Section 13. Pending Actions.


                                       4
<PAGE>

        There is not pending or, to the knowledge of Tenant,  threatened against
or contemplated by the Tenant, any petition in bankruptcy,  whether voluntary or
otherwise,  any assignment for the benefit of creditors, or any petition seeking
reorganization or arrangement under the federal  bankruptcy laws or those of any
state.

        Section 14. Tenant Improvements.

         As of the date of this Certificate,  to the best of Tenant's knowledge,
Landlord has  performed  all  obligations  required of Landlord  pursuant to the
Lease;  no offsets,  counterclaims,  or defenses of Tenant under the Lease exist
against Land- lord; and no events have occurred  that,  with the passage of time
or the giving of notice, would constitute a basis for offsets, counterclaims, or
defenses against Landlord, except as follows:___________________________________
________________________________________________________________________________
_________________________.
(If none, please state "None.")

        Section 15. Assignments by Landlord.

        Tenant has received no notice of any assignment, hypothecation or pledge
of the Lease or rentals under the Lease by Landlord.  Tenant hereby  consents to
an  assignment  of the lease and rents to be  executed  by  Landlord to Buyer or
Lender in connection  with the Loan and  acknowledges  that said assignment does
not violate the provisions of the Lease.  Tenant  acknowledges that the interest
of the Landlord  under the Lease is to be assigned to Buyer or Lender  solely is
security for the purposes specified in said assignment and Buyer or Lender shall
have no  duty,  liability  or  obligation  whatsoever  under  the  Lease  or any
extension  or renewal  thereof,  either by virtue of said  assignment  or by any
subsequent  receipt or  collection of rents  thereunder,  unless Buyer or Lender
shall specifically undertake such liability in writing.  Tenant agrees that upon
receipt of a written  notice from Buyer or Lender of a default by Landlord under
the Loan,  Tenant will thereafter pay rent to Buyer or Lender in accordance with
the terms of the Lease.

        Section 16. Assignments by Tenant.

        Tenant has not sublet or  assigned  the Leased  Premises or the Lease or
any portion  thereof to any sublessee or assignee.  No one except Tenant and its


                                       5
<PAGE>

employees will occupy the Leased Premises. The address for notices to be sent to
Tenant is as set forth in the Lease.

        Section 17. Environmental Matters.

        The  operation  and use of the  Leased  Premises  does not  involve  the
generation,  treatment, storage, disposal or release into the environment of any
hazardous  materials,  regulated materials and/or solid waste, except those used
in the  ordinary  course  of  operating  a  retail  store or  otherwise  used in
accordance with all applicable laws.

        Section 18. Succession of Interest.

        Tenant agrees that, in the event Buyer or Lender succeeds to interest of
Landlord under the Lease:

        (a) Buyer or Lender  shall not be liable for any act or  omission of any
prior landlord (including Landlord);

        (b) Buyer or Lender  shall not be liable for the return of any  security
deposit;

        (c) Buyer or Lender  shall not be bound by any rent or  additional  rent
which Tenant might have prepaid under the Lease for more than the current month;

        (d)  Buyer  or  Lender  shall  not  be  bound  by  any   amendments   or
modifications of the Lease made without prior consent of Buyer or Lender;

        (e) Buyer or Lender  shall not be  subject to any  offsets  or  defenses
which Tenant might have against any prior landlord (including Landlord); or

        (f) Buyer or Lender  shall not be liable  under the Lease to Tenant  for
the  performance  of  Landlord's  obligations  under the Lease  beyond  Buyer or
Lender's interest in the Property.

        Section 19. Notice of Default.

        Tenant  agrees to give  Buyer and Lender a copy of any notice of default
under the Lease served upon Landlord at the same time as such notice is given to


                                       6
<PAGE>

the Landlord.  Tenant  further  agrees that if Landlord  shall fail to cure such
default within the applicable grace period,  if any, provided in the Lease, then
Buyer or Lender  shall have an  additional  sixty (60) days within which to cure
such  default,  or if such  default  cannot be cured  within such sixty (60) day
period,  such sixty (60) day period shall be extended so long as Buyer or Lender
has  commenced and is  diligently  pursuing the remedies  necessary to cure such
default (including, but not limited to, commencement of foreclosure proceedings,
if  necessary  to effect  (such  cure),  in which  event the Lease  shall not be
terminated while such remedies are being pursued.

        Section 20. Notification by Tenant.

        From   the   date   of   this    Certificate   and   continuing    until
_____________, Tenant  agrees to immediately notify Buyer and Lender, in writing
by registered or certified  mail,  return  receipt  requested,  at the following
addresses,  on the  occurrence  of any event or the  discovery  of any fact that
would make any representation  contained in this Certificate  inaccurate: 


      If To Buyer:            Alexandria Real Estate Equities, Inc.
                              135 N. Los Robles Avenue, Suite 250
                              Pasadena, California 91101 
                              Attention: Corporate Secretary

     With A Copy To:          Skadden, Arps, Slate, Meagher & Flom
                              300 South Grand Avenue, Suite 3400
                              Los Angeles, California 90071
                              Attention: George M. Eshaghian

     If To Lender:



        Tenant makes this  Certificate with the knowledge that it will be relied
upon by Buyer and Lender in agreeing to purchase the Property.

        Tenant has executed this  Certificate as of the date first written above
by the person named below, who is duly authorized to do so.



                                       7
<PAGE>

                                        TENANT
                                        ________________________________________

                                        By:   __________________________

                                              Name:
                                              Its:




                           LOAN AND SECURITY AGREEMENT

         THIS LOAN AND SECURITY AGREEMENT (this "Agreement") is made as of March
25, 1998 by and between ARE-4757 NEXUS CENTRE, LLC, a Delaware limited liability
company  ("Lender"),  and MATRIX  PHARMACEUTICAL,  INC., a Delaware  corporation
("Borrower"), with respect to the following Recitals:


                                 R E C I T A L S

                  A. Borrower is the owner of the  Improvements  (as hereinafter
defined).

                  B.  Borrower  desires  to borrow  from  Lender,  and Lender is
willing  to loan to  Borrower,  the  principal  amount  of Six  Million  Dollars
($6,000,000.00) for the purposes and upon the terms set forth herein.


                                A G R E E M E N T

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


                                65535RT65535CLE 1
                               GENERAL DEFINITIONS

         When used herein, the following initially  capitalized terms shall have
the following meanings:

         "Affiliate"  means, with respect to any Person,  any other Person which
controls,  is  controlled  by, or is under  common  control  with the  Person in
question.  For the purposes of the  foregoing  definition,  "controls"  (and its
correlative  terms  "controlled  by" and  "under  common  control  with")  means
possession  by the  applicable  Person  of the  power to  direct  or  cause  the
direction of the management and policies thereof,  whether through the ownership
of voting securities, by contract, or otherwise.

         "Agreement" means this Loan and Security  Agreement,  together with all
supplements, amendments and modifications hereto and all extensions and renewals
hereof.

         "Attorneys' Fees,"  "Attorneys' Fees and Costs,"  "attorneys' fees" and
"attorneys'  fees and


<PAGE>


costs"  mean the  reasonable  fees and  expenses  of counsel  to the  applicable
parties  to the  Loan  Documents,  which  may  include  printing,  photostating,
duplicating, facsimilating, messengering, filing and other expenses, air freight
charges, and fees billed for law clerks,  paralegals,  librarians and others not
admitted  to the  bar  but  performing  services  under  the  supervision  of an
attorney.  The terms "attorneys' fees" or "attorneys' fees and costs" shall also
include, without limitation, all such fees and expenses incurred with respect to
appeals, arbitrations,  bankruptcy proceedings and any post-judgment proceedings
to collect any judgment,  and whether or not any action or proceeding is brought
with respect to the matter for which, such fees and expenses were incurred,  but
shall not  include any such fees or expenses  incurred  in  connection  with the
preparation and negotiation of the Lease or the Purchase Agreement. The recovery
of  post-judgment  fees,  costs and  expenses is separate  and several and shall
survive the merger of the applicable Loan Documents into any judgment.

         "Bankruptcy  Code"  means  Titles  7,  11 or 13 of the  U.S.  Code,  as
applicable, or any similar federal or state laws for the relief of debtors, each
as hereafter amended.

         "Business Day" means any day other than a Saturday,  a Sunday,  a legal
holiday under the laws of the State of  California or a day on which  commercial
banks in such state are  authorized  or  required  by law or other  governmental
action to be closed.

         "Closing  Date"  means  the  date of the  closing  of the  Loan and the
recordation of the Deed of Trust in the Official  Records of the County in which
the Project is situated.

         "Contractual  Obligation"  as applied to any Person means any provision
of any  instrument,  document  or  security  issued  by  that  Person  or of any
indenture,  mortgage, deed of trust, contract,  undertaking,  agreement or other
instrument to which that Person is a party or by which any of its  properties is
bound or to which it or any of its properties is subject.

         "Deed of Trust" means that certain Deed of Trust and Fixture  Filing of
even date herewith executed by Borrower,  as trustor, to Chicago Title Insurance
Company,  as trustee,  and naming Lender, as beneficiary,  to be recorded on the
Closing  Date in the  Official  Records  of the  County in which the  Project is
situated.

         "Default  Interest  Rate" means an interest  rate that is the lesser of
(i) eighteen percent (18%) per annum or (ii) the maximum rate permitted by law.

         "Environmental Laws" is defined in the Lease.

         "Event of Default" means any of the events specified in Section 6.1.

                                       2

<PAGE>


         "Formation Documents" means (a) as to any corporation,  its articles of
incorporation and bylaws, (b) as to any limited partnership,  its Certificate of
Limited Partnership and partnership agreement, (c) as to any general partnership
or joint venture, its Statement of Partnership and partnership agreement, (d) as
to any limited  liability  company,  its articles or certificate of organization
and  operating  agreement,  and (e) as to any trust,  its trust  agreement and a
certification of the current trustees  thereof,  each of the foregoing  together
with all supplements, amendments and modifications.

         "General  Partner" or "general  partner" means the general  partners of
the partnership in question,  together with any constituent  general partners of
such general partners.

         "Governmental  Agency"  means any  federal,  state,  municipal or other
governmental or quasi-governmental court, agency, authority or district.

         "Hazardous Substances" is defined in the Lease.

         "Improvements"  means all fixtures and  interior  improvements  located
within the  manufacturing  suites  cross-hatched  on Exhibit B-1 attached hereto
(which  manufacturing suites are located within the buildings upon the Project),
including,  without  limitation,  the  fixtures and  improvements  to the extent
constituting  real  property and located  therein and  identified on Exhibit B-2
attached hereto,  together with all present and future attachments,  accessions,
replacements, substitutions and additions thereto or therefor, and together with
all  insurance  proceeds  relating to the loss of or damage to such  fixtures or
improvements  which Borrower receives from any policy of insurance  covering any
of the foregoing property now or hereafter acquired by Borrower.

         "Indemnitees"  means,   collectively  and  individually,   Lender,  its
Affiliates and its and their directors, officers, agents, employees,  successors
and assigns.

         "Laws"  means  all  federal,   state,   county,   municipal  and  other
governmental and quasi-governmental  statutes, laws, rules, orders, regulations,
ordinances,  judgments, decrees and injunctions affecting Borrower's interest in
the  Project or  Borrower's  occupancy,  operation,  ownership  or use  thereof,
whether now or hereafter enacted and in force including, without limitation, the
Americans With Disabilities  Act, 42 U.S.C.  ss.ss.  12101-12213  (1991) and all
Environmental   Laws,  any  zoning  or  other  land  use  entitlements  and  any
requirements  which may require  repairs,  modifications or alterations in or to
the  Project,  all  Permits  and all  covenants,  agreements,  restrictions  and
encumbrances  running  in favor of any  Person,  contained  in any  instruments,
either of record or known to Borrower, at any time in force affecting Borrower's
interest in the Project or  Borrower's  occupancy,  operation,  ownership or use
thereof.

                                       3

<PAGE>


         "Lease"  means that certain  Lease of even date herewith by and between
Lender,  as landlord,  and Borrower,  as tenant,  pursuant to which Borrower has
leased from Lender a portion of the Project.

         "Lien" means any mortgage,  deed of trust,  pledge,  security interest,
encumbrance,  lien, charge or claim of any kind (including any agreement to give
any of the foregoing,  any conditional sale or other title retention  agreement,
any lease in the nature  thereof,  and/or the filing of or agreement to give any
financing  statement under the Uniform Commercial Code of any jurisdiction) with
respect to  Borrower's  interest in the Project or the Personal  Property or any
portion thereof or interest therein.

         "Loan"  means the loan to Borrower as more  particularly  described  in
Section 2.1.

         "Loan Documents" means the documents  described in Section 3.1, and all
other documents  securing,  or executed in connection  with, the Loan,  together
with all renewals,  substitutions,  extensions,  modifications  or  replacements
thereof.

         "Maturity  Date"  means the date set  forth in the Note upon  which the
entire  principal  amount of the Loan,  together with all other amounts owing to
Lender under the Loan Documents, shall be due and payable.

         "Note" means that certain Secured Promissory Note of even date herewith
in the  principal  amount of Six  Million  Dollars  ($6,000,000.00)  executed by
Borrower, as maker, in favor of Lender, as holder,  substantially in the form of
Exhibit D attached hereto, and any and all modifications,  extensions,  renewals
and replacements thereof.

         "Permits" means all permits, licenses, franchises, approvals, variances
and  land  use  entitlements  necessary  for  Borrower's  occupancy,  operation,
ownership and use of the Project.

         "Permitted  Liens"  means  the  liens and  encumbrances  identified  on
Exhibit E attached hereto.

         "Person"  means and includes  natural  persons,  corporations,  limited
liability  companies,  limited  liability  partnerships,  limited  partnerships,
general  partnerships,  joint stock  companies,  joint  ventures,  associations,
companies,  trusts, banks, trust companies,  land trusts,  business trusts, real
estate investment trusts or other organizations,  whether or not legal entities,
and governments and agencies and political subdivisions thereof.

                                       4

<PAGE>


         "Personal  Property" means all personal property described on Exhibit C
attached hereto,  together with all present and future attachments,  accessions,
replacements, substitutions and additions thereto or therefor, and together with
all  insurance  proceeds  relating  to the loss of or  damage  to such  personal
property  which Borrower  receives from any policy of insurance  covering any of
the foregoing property now or hereafter acquired by Borrower; provided, however,
that "Personal  Property" shall not include any of Borrower's  inventory or work
in process.

         "Potential  Default" means a condition or event which,  with the giving
of notice or  passage of time,  or both,  would  constitute  an Event of Default
under any of the Loan Documents or the Lease.

         "Principals" means individually and collectively  Borrower, its general
partners,  managing members and major shareholders,  as applicable,  and each of
such  parties'   constituent  general  partners,   managing  members  and  major
shareholders, as applicable.

         "Project"  means that  certain  parcel of land  described  on Exhibit A
attached hereto.

         "Project  Documents"  means (a) all  agreements to which  Borrower is a
party now or  hereafter  in effect with any  contractor,  architect or engineer,
including, without limitation, any design architect,  landscape architect, civil
engineer,  electrical  engineer,   environmental  engineer,  soils  engineer  or
mechanical engineer,  in connection with Borrower's interest in the Project; (b)
all other  agreements  to which  Borrower is a party now or  hereafter in effect
with any property manager or broker with respect to the management,  subleasing,
or operation of Borrower's  interest in the Project;  (c) all as-built plans and
specifications  and  surveys  for  the  Project;  (d) all  Permits;  and (e) all
renewals, substitutions, extensions, modifications or replacements of any of the
foregoing.

         "Purchase Agreement" means that certain Purchase and Sale Agreement and
Joint  Escrow  Instructions,  dated  as of  February  3,  1998,  by and  between
Borrower,  as seller,  and  Alexandria  Real Estate  Equities,  Inc., a Maryland
corporation, as buyer.

         "Related Parties" means Borrower, Principals, any Affiliate of Borrower
or Principals,  any  partnership of which Borrower or any Principal is a general
partner, and any limited liability company of which Borrower or any Principal is
a manager or managing member.

         "Secured Obligations" is defined in the Deed of Trust.

         "Tax Identification  Number" means Borrower's  employer  identification
number or social security number, which is 94-2957068.

                                       5

<PAGE>


         "Title  Policy"  means an  American  Land  Title  Association  Extended
Coverage Policy of Title Insurance (1970 version, amended 10/17/70 only), issued
by Chicago Title Insurance  Company ("Title  Company"),  insuring Lender that on
the Closing  Date the Deed of Trust is a valid  first lien on the  Improvements,
and is in  the  amount  of  the  Loan.  The  Title  Policy  shall  contain  such
endorsements  as Lender  reasonably  requires  and shall be subject only to such
exceptions  to coverage  as  approved by Lender in writing  prior to the Closing
Date.


                                65535RT65535CLE 2
                                   LOAN TERMS

         2.1      Loan and Disbursements of Loan Proceeds.

                  Subject to the terms and conditions of this Agreement,  and in
reliance upon the  representations  and  warranties of Borrower set forth in the
Loan Documents, Lender agrees to make to Borrower, and Borrower agrees to accept
from Lender,  a loan (the "Loan") in the principal amount of Six Million Dollars
($6,000,000.00).  The Loan proceeds  shall be disbursed by Lender on the Closing
Date.

         2.2      Evidence of Indebtedness and Maturity.

                  Borrower shall execute and deliver to Lender, on or before the
Closing  Date,  the Note  evidencing  the  Loan.  Borrower  agrees  to repay the
indebtedness  evidenced by the Note in accordance with the terms thereof and the
terms  hereof.  The  outstanding  principal  balance of the Loan,  together with
accrued and unpaid  interest  thereon and all other amounts  payable by Borrower
under the Loan Documents shall be due and payable on the Maturity Date.

         2.3      Interest Rate.

                  The Loan shall bear  interest at the rate per annum  specified
in the Note.


                                65535RT65535CLE 3
                               CONDITIONS TO LOAN

         3.1      Condition Precedent to Closing of Loan.

                  As a condition  precedent to Lender's  obligation to close the
Loan and disburse any Loan proceeds, on or before the Closing Date Borrower must
satisfy and fulfill each of the following  conditions  precedent to closing,  to
the satisfaction of Lender:

                                       6

<PAGE>


                  A. Loan  Documents.  Borrower  shall  deliver  to  Lender  the
following  documents,  each duly  executed and  acknowledged  by a notary public
where necessary, and in form and substance satisfactory to Lender:

                           (i)      This Agreement;
                           (ii)     The Lease;
                           (iii)    The Note;
                           (iv)     The Deed of Trust; and
                           (v)      A  California   UCC-1  Financing   Statement
relating to the Personal  Property and the  Improvements (to the extent that the
Improvements or any portion thereof or proceeds  therefrom  constitute  personal
property),  to be filed with the  California  Secretary of State,  together with
UCC-1 Financing Statements for such other States as are required by Lender.

                  B.  Title.   The  Title  Company  shall  be  irrevocably   and
unconditionally  committed  to issue the Title  Policy to Lender in the form and
with such endorsements required by Lender.

                  C. Opinion.  Borrower's  counsel shall be committed to deliver
to Lender an opinion  regarding the  enforceability  and the due  authorization,
execution  and delivery of this  Agreement,  the Note and the Deed of Trust,  in
form and substance,  and containing such assumptions and qualifications,  as may
be reasonably satisfactory to Lender's counsel.

                  D.   Truth   of    Representations    and   Warranties.    The
representations  and  warranties of Borrower  contained  herein and in the other
Loan Documents,  the Lease and the Purchase Agreement shall be true, correct and
complete in all material respects on the Closing Date.

                  E. No  Default.  As of the Closing  Date,  no event shall have
occurred or would result from the funding of the Loan that would  constitute  an
Event of Default or a Potential Default.


                                65535RT65535CLE 4
                               SECURITY AGREEMENT

         4.1      Grant of Security Interest.

                  As security  for the payment  and  performance  of the Secured
Obligations,  subject  to the  terms  and  conditions  hereof,  Borrower  hereby
assigns, transfers and grants to Lender, and there is hereby created in favor of
Lender, a security  interest under the California  Commercial

                                       7

<PAGE>


Code in and to the Personal  Property and the  Improvements  (to the extent that
the  Improvements  or any  portion  thereof  or  proceeds  therefrom  constitute
personal property), whether now owned or hereafter acquired, and in all proceeds
thereof (and proceeds of proceeds).  This Agreement shall  constitute a security
agreement  pursuant  to the  California  Commercial  Code  with  respect  to the
Personal  Property and the  Improvements (to the extent that the Improvements or
any portion thereof or proceeds therefrom  constitute personal property) and the
proceeds  thereof,  with Borrower the "Debtor" and Lender the "Secured Party" as
such terms are used therein.

         4.2      Representations, Agreements and Covenants Regarding Personal
                  Property and Improvements.

                  In order to induce  Lender to enter  into this  Agreement  and
make the Loan, Borrower represents, warrants and covenants as follows:

                  A. Except for the security interest in favor of Lender and the
Permitted  Liens,  Borrower  is, and as to any of the  Personal  Property or the
Improvements  acquired  after the date  hereof  will be,  the sole owner of such
Personal  Property  and  Improvements,  free  from any  adverse  lien,  security
interest,  or adverse claim of any kind whatsoever.  Borrower will notify Lender
of and will defend such Personal  Property and  Improvements  against all claims
and demands of all persons at any time claiming any interest therein.

                  B.   Borrower   will  keep  the  Personal   Property  and  the
Improvements in good condition and repair, and will not misuse,  abuse, allow to
deteriorate, waste or destroy such Personal Property or Improvements or any part
thereof,  except for ordinary wear and tear  resulting  from normal and expected
use in the  ordinary  course of  Borrower's  business,  which  shall be promptly
replaced by  Borrower  with  property of similar  nature and of equal or greater
value unless obsolete.

                  C.  Borrower will not,  without the prior  written  consent of
Lender,  sell, offer to sell or otherwise  transfer,  exchange or dispose of the
Personal  Property or the  Improvements  or any  interest  therein,  unless such
Personal  Property or  Improvements  are being replaced by collateral of similar
nature  and  of  equal  or  greater  value.  If  the  Personal  Property  or the
Improvements or any part thereof are sold, transferred,  exchanged, or otherwise
disposed of (either with or without the written consent of Lender), the security
interest of Lender shall extend to the proceeds of such sale, transfer, exchange
or other  disposition and Borrower will hold such proceeds in a separate account
for Lender's  benefit and will, at Lender's  request,  transfer such proceeds to
Lender.

                  D. The tangible  Personal  Property  will be kept on or at the
Project and  Borrower  will not,  without the prior  written  consent of Lender,
remove  the  Personal  Property  or

                                       8

<PAGE>


the  Improvements  (to the extent that the  Improvements  or any portion thereof
constitute personal property) therefrom or otherwise sever the Improvements from
the  Project  except  such  portions  or  items  of such  Personal  Property  or
Improvements which are consumed or worn out in ordinary usage or due to casualty
not caused by Borrower,  all of which shall be promptly  replaced by Borrower as
provided in Section 4.2(B).

                  E. Borrower will  immediately  notify Lender in writing of any
change in its place of business  or the  adoption or change of any trade name or
fictitious business name, and will, within ten (10) days after Lender's request,
execute any additional  financing  statements or other  certificates  reasonably
requested by Lender to reflect such change.

                  F. The Personal Property and the Improvements are not and will
not be used or bought for personal, family or household purposes.

                  G.  Borrower  shall  immediately  notify  Lender  of any claim
against the  Personal  Property or the  Improvements  adverse to the interest of
Borrower or Lender therein.

                  H. Lender may examine and inspect the  Personal  Property  and
the Improvements at any reasonable time, wherever located, upon reasonable prior
notice to Borrower.

         4.3      Affixed Collateral.

                  The  inclusion  in Section  4.1 of any  Personal  Property  or
Improvements  (to the  extent  that  the  Improvements  or any  portion  thereof
constitute personal property) which may now be or hereafter become affixed or in
any manner  attached to the Project  shall be without  prejudice to any claim at
any time made by Lender that such Personal  Property or Improvements are or have
become a part of or an accession to the Project.

         4.4      Further Security Agreements.

                  Borrower agrees to take such actions and, within ten (10) days
after  Lender's  request,  to  execute,  deliver  and file  and/or  record  such
documents, agreements and financing statements as may be reasonably necessary to
evidence  the  security  interest  set forth in Section  4.1, to  establish  the
priority thereof and to carry out the intent and purpose of this Article 4.

         4.5      Borrower's License.

                  Notwithstanding  anything to the contrary  herein,  as long as
there shall exist no Event of Default  hereunder,  Borrower shall have the right
under a license hereby  granted by

                                       9

<PAGE>


Lender to collect,  but not prior to accrual, all cash proceeds arising from (i)
Borrower's ownership of the Personal Property and Improvements,  (ii) Borrower's
leasehold interest in the Project as a result of Borrower's leasing or licensing
thereof and (iii) the  ordinary  course of  Borrower's  business in the Project;
provided that,  except as otherwise  provided  herein,  Borrower shall not sell,
encumber,  pledge or otherwise  dispose of the Personal Property or Improvements
without the Lender's prior written  approval,  which may be withheld in Lender's
sole discretion.


                                65535RT65535CLE 5
                    BORROWER'S REPRESENTATIONS AND WARRANTIES

         As an inducement to Lender to execute this Agreement and make the Loan,
Borrower represents and warrants to Lender the truth and accuracy of the matters
set forth in this Article 5.

         5.1      Organization, Power, Good Standing, and Business.

                  Borrower is a corporation duly formed, validly existing and in
good  standing  under the Laws of the State of Delaware and, if formed under the
Laws of a jurisdiction other than the State of California,  has registered to do
business  and is in good  standing  under the Laws of the  State of  California.
Borrower has the full power and authority to own and operate its properties,  to
carry on its business as now conducted, to enter into each Loan Document, and to
carry out the transactions contemplated hereby and thereby. Borrower does not do
business  under any trade name or  fictitious  business  name other than "Matrix
Pharmaceutical".  Borrower has  delivered  to Lender true,  correct and complete
copies of its Formation  Documents and such  Formation  Documents  have not been
amended or modified except  pursuant to agreements  delivered to Lender prior to
the date hereof.

         5.2      Authorization of Borrowing, etc.

                  A.  Authorization  of Borrowing.  The execution,  delivery and
performance of the Loan Documents and the issuance,  delivery and payment of the
Note have been duly authorized by all necessary action of Borrower.

                  B. No Conflict.  The  execution,  delivery and  performance by
Borrower of each  applicable  Loan  Document do not and will not (i) violate any
Law applicable to any such Person,  the Formation  Documents of any such Person,
or any  order,  judgment  or decree of any  court or other  Governmental  Agency
binding  on any such  Person;  (ii)  conflict  with,  result  in a breach  of or
constitute  (with the giving of notice or the passage of time or both) a default
under any Contractual  Obligation of any such Person; (iii) result in or require
the creation or imposition

                                       10

<PAGE>


of any Lien of any  nature on  Borrower's  properties  or assets  other than the
Liens in favor of Lender under the Loan Documents;  or (iv) require any approval
or consent of any Person under any Contractual Obligation of Borrower.

                  C.  Governmental   Consents.   The  execution,   delivery  and
performance by Borrower of each  applicable  Loan Document does not and will not
require any  registration  with,  consent or approval of, or notice to, or other
action to, with or by, any Governmental Agency or other Person.

                  D. Binding  Obligation.  The Note and the other Loan Documents
are the legally valid and binding  obligations of Borrower,  enforceable against
Borrower in accordance with their respective terms, except as enforcement may be
limited by bankruptcy,  insolvency,  reorganization,  moratorium or similar laws
relating to or limiting creditors' rights generally.

         5.3      Actions.

                  There is no action, suit, proceeding or arbitration, before or
by any  Governmental  Agency or other  Person,  pending or, to  Borrower's  best
knowledge,  threatened against or affecting  Borrower,  any of the Principals or
any  properties  or rights of  Borrower  or any of the  Principals,  which might
adversely  affect  Lender's  rights or remedies  under the Loan  Documents,  the
business,  assets,  operations  or financial  condition of any such party or its
ability to perform  its  obligations  under the Loan  Documents.  As of the date
hereof, there are no outstanding  judgments against the Related Parties or their
property.

         5.4      Financial Position.

                  A.  Financial   Information.   All  financial  statements  and
financial data delivered to Lender in connection  with the Loan and/or  relating
to Borrower and the  Principals  are true,  correct and complete in all material
respects and accurately present the financial position of such parties as of the
date thereof.  No material adverse change has occurred in the financial position
disclosed by any financial statements or financial data delivered to Lender.

                  B. Bankruptcy and Insolvency.  Neither Borrower nor any of the
Related  Parties  has filed or been the subject of any  bankruptcy,  insolvency,
reorganization,  dissolution  or similar  proceeding or any  proceeding  for the
appointment  of a receiver or trustee for all or any  substantial  part of their
respective  property.  Neither  Borrower  nor  any of the  Related  Parties  has
admitted in writing its  inability to pay its debts when due, made an assignment
for the benefit of creditors or taken other similar action.

                  C. Other  Borrowing.  Except for the Loan, no borrowings  have
been made by

                                       11

<PAGE>


Borrower which are secured by the  Improvements  or which might give rise to any
Lien other than the Liens created by the Loan Documents.

         5.5      Liens.

                  Borrower is the sole owner of the  Improvements  free from any
adverse Liens,  except for Liens and other rights in favor of Lender and for the
Permitted  Liens.  Borrower  has  paid in  full  all  contractors,  materialmen,
laborers, architects or other such Persons hired by Borrower to perform services
or work with respect to the  Improvements  and all  statutory  lien periods have
expired with respect to any such services or work. No previous assignment, sale,
pledge,  encumbrance or other  hypothecation  of the  Improvements has been made
(except  for  Permitted  Liens and  pledges  and  encumbrances  which  have been
released  in  full  prior  to the  date  hereof  or  will  be  released  in full
concurrently with the funding of the Loan).

         5.6      Defects.

                  To the best of  Borrower's  knowledge,  there are no  defects,
facts or conditions  affecting  the  Improvements  or any portion  thereof which
would make the  Improvements  unsuitable  for their intended  operation,  use or
sale.

         5.7      No Defaults.

                  No  Potential  Default or Event of Default  exists  under this
Agreement, the Lease, the Purchase Agreement or any of the other Loan Documents.
To the best of  Borrower's  knowledge,  no default by Borrower  exists under any
Contractual  Obligation which would have a material adverse effect on Borrower's
ability to repay the Loan or to perform  its  obligations  under any of the Loan
Documents or the Lease.

         5.8      Disclosure.

                  No  representation  or warranty of Borrower  contained in this
Agreement,  the Lease, the Purchase  Agreement or any Loan Document contains any
untrue  statement of a material fact or omits to state a material fact necessary
in order to make the statements contained herein or therein not misleading.


                                65535RT65535CLE 6
                              BORROWER'S COVENANTS

                  Borrower  covenants  and agrees  that,  until the Loan and all
other  amounts owing

                                       12

<PAGE>


to Lender  under  the Loan  Documents  have  been  paid in full and all  Secured
Obligations have been satisfied,  Borrower shall perform all of the covenants in
this Article 6.

         6.1      No Liens.

                  Borrower  shall not  permit  any Lien to be made or filed with
respect to the  Improvements  except for Liens which are being contested in good
faith,  for which adequate  reserves have been established and which do not pose
an imminent risk to the Improvements or the Personal Property. Borrower shall be
the sole owner of the  Improvements,  free from any  adverse  Liens,  except for
Permitted Liens and Liens in favor of Lender.  Borrower shall not assign,  sell,
pledge,   encumber  or  otherwise   hypothecate   all  or  any  portion  of  the
Improvements.

         6.2      Compliance with Laws.

                  Borrower  shall comply with all Laws  applicable  to Borrower,
its property,  Borrower's  interest in the Project,  the Personal Property,  the
Improvements and/or Borrower's occupancy, operation, ownership or use thereof.

         6.3      Inspection.

                  During  normal  business  hours  and upon  reasonable  advance
notice,  Borrower  shall permit  Lender and any Person  designated  by Lender to
visit and inspect the Improvements.

         6.4      Environmental Matters.

                  Borrower  shall  comply  and cause all  persons  entering  the
Project to comply with all  Environmental  Laws and all of Borrower's  covenants
relating to Hazardous Substances set forth in the Lease.

         6.5      Insurance Requirements.

                  Borrower  shall procure and maintain,  or cause to be procured
and  maintained,  at  all  times  until  the  repayment  of  the  Loan  and  the
satisfaction  of the  Secured  Obligations,  policies of  insurance  in form and
amounts satisfying the requirements of the Lease.

         6.6      Notice of Proceeding.

                  Borrower  will  promptly  notify  Lender of any action,  suit,
proceeding  or  arbitration  (including,  without  limitation,  any  judicial or
nonjudicial  foreclosure  proceeding,  any

                                       13

<PAGE>


voluntary  or  involuntary  bankruptcy  proceeding  or any  proceeding  for  the
appointment  of a  receiver),  commenced or  threatened  against  Borrower,  the
Improvements,  Borrowers'  interest  in the  Project or any  portion  thereof or
interest  therein.  Borrower  shall  deliver to Lender copies of all notices and
other information in connection with any action, suit, proceeding or arbitration
promptly upon receipt or transmittal thereof.

         6.7      Representations and Warranties.

                  Until  repayment  of the Loan and all other  amounts  owing to
Lender  under the Loan  Documents  and the  satisfaction  of all  other  Secured
Obligations,  the  representations  and  warranties set forth in Article 5 shall
remain true and correct.

         6.8      Financial Reporting.

                  Borrower  shall  deliver  to Lender  (a)  within  thirty  days
following  the end of each  fiscal  quarter of  Borrower,  Borrower's  unaudited
financial  statements and accompanying  notes for such quarter and year to date,
certified  by Borrower to be true,  correct and  complete in all  respects,  (b)
within sixty days following the end of each fiscal year of Borrower,  Borrower's
audited financial  statements and accompanying notes for such year, certified by
Borrower  to be true,  correct  and  complete  in all  respects,  (c) within ten
business days following the occurrence of any event or circumstance  which could
reasonably  be expected  to have a material  adverse  affect upon the  business,
prospects or  financial  condition of Borrower,  notice  thereof  together  with
Borrower's plans to address such event or circumstance,  (d) promptly  following
the  preparation  or  submission  of such items,  copies of all 10-K's,  10-Q's,
8-K's, proxy statements,  annual reports,  Business Plans and other materials as
may be reasonably  requested by Buyer  pertaining to the financial  condition of
Seller.


         6.9      Further Assurances.

                  Borrower  shall execute and deliver from time to time,  within
ten (10)  business  days after any request by Lender,  any and all  instruments,
agreements  and  documents and shall take such other action as may be reasonably
necessary or  desirable in the opinion of Lender to maintain,  perfect or insure
Lender's  security  provided  for  herein  and  in  the  other  Loan  Documents,
including,  without limitation,  the execution of UCC-1 renewal statements,  the
execution of such  amendments to the Deed of Trust and the other Loan  Documents
and the delivery of such  endorsements to the Title Policy,  all as Lender shall
reasonably require, and to the extent that such actions are required as a result
of Borrower's activities or an Event of Default, Borrower shall pay all fees and
expenses  (including  reasonable  attorney's fees) related  thereto,  and in all

                                       14

<PAGE>


other circumstances Lender shall be responsible for its own fees and expenses.


                                65535RT65535CLE 7
                           EVENTS OF DEFAULT; REMEDIES

         7.1      Events of Default.

                  The occurrence of any of the following events shall constitute
an Event of Default under this Agreement and the other Loan Documents:

                  A. Failure to Make  Payments When Due.  Borrower's  failure to
pay any principal,  interest or other monies due under this Agreement, the Lease
or any of the other Loan  Documents  within three (3) days after written  notice
that such amount is due (provided, however, that Lender shall have no obligation
to give Borrower written notice more than two times in any twelve month period).

                  B.  Breach of  Covenants.  Borrower's  failure  to  perform or
comply with any other term,  obligation or condition contained in this Agreement
or any of the other Loan  Documents,  within thirty (30) days after the delivery
of written notice from Lender of such failure;  provided that if such default is
not reasonably  capable of being cured within such thirty (30) day period,  such
failure shall not  constitute an Event of Default so long as Borrower  commences
the cure of such  default  within  such  thirty  (30) day period and  diligently
prosecutes  such cure to  completion  within  sixty (60) days after such written
notice from Lender.

                  C.  Breach  of   Warranty.   Any   representation,   warranty,
certification  or other  statement made by Borrower  herein or in any other Loan
Document or in any statement or certificate at any time given by Borrower or any
of the  Principals  to Lender in  writing in  connection  with the Loan shall be
materially false or misleading.

                  D.       Involuntary Bankruptcy; Appointment of Receiver, etc.

                  (i) A court having proper jurisdiction shall enter a decree or
order for relief  with  respect to  Borrower  in an  involuntary  case under the
Bankruptcy  Code or any applicable  bankruptcy,  insolvency or other similar law
now or hereafter in effect, which decree or order is not stayed within seven (7)
days after entry and  dismissed  within ninety (90) days after the entry of such
order; or any other similar relief shall be granted under any applicable federal
or state law; or

                  (ii) An involuntary case is commenced  against Borrower or any
of the Principals, under any applicable bankruptcy,  insolvency or other similar
law now or  hereafter  in

                                       15

<PAGE>


effect;  or a decree  or order of a court  for the  appointment  of a  receiver,
liquidator,  sequestrator,  trustee,  custodian or other officer  having similar
powers over Borrower or any of the Principals or over all or a substantial  part
of their respective property,  shall be entered; or the involuntary  appointment
of an interim  receiver,  trustee or other  custodian  of Borrower or any of the
Principals,  for all or a substantial part of their respective property;  or the
issuance of a warrant of attachment,  execution or similar  process  against any
substantial  part  of  the  respective  property  of  Borrower  or  any  of  the
Principals, and the continuance of any such event in this clause (ii) for ninety
(90) days unless dismissed or discharged.

                  E.       Voluntary Bankruptcy; Appointment of Receiver, etc.

                  (i) Borrower or any of the Principals  shall have an order for
relief  entered  with  respect to them or  commence a  voluntary  case under the
Bankruptcy  Code or any applicable  bankruptcy,  insolvency or other similar law
now or hereafter in effect, or shall consent to the entry of an order for relief
in an  involuntary  case,  or to the  conversion  of an  involuntary  case  to a
voluntary  case,  under any such law, or shall consent to the  appointment of or
taking  possession  by a  receiver,  trustee  or  other  custodian  for all or a
substantial part of their respective property;  the making by Borrower or any of
the Principals of any assignment for the benefit of creditors; or

                  (ii)  The  inability  or  failure  of  Borrower  or any of the
Principals,  or the admission by Borrower or any of the Principals in writing of
its inability, to pay their respective debts as such debts become due.

                  F. Lien Priority.  Lender fails to have a legal, valid binding
and  enforceable  first  priority  Lien on the  Improvements  and  the  Personal
Property subject only to Permitted Liens.

                  G. Unapproved Transfers. Any transfer of the Improvements, the
Personal Property,  Borrower's interest in the Lease or any interest in Borrower
occurs without Lender's prior written consent or otherwise in accordance with of
the Loan Documents.

                  H. Failure to Maintain  Insurance.  Borrower fails to maintain
or cause to be maintained the insurance coverage required by Section 6.5.

                  I. Other Liens. Without limiting the provisions of Section 6.1
of this  Agreement,  Borrower  defaults  under  any Lien  (other  than the Liens
created by the Loan Documents) or foreclosure or other proceedings are commenced
to enforce any Lien (other than the Liens created by the Loan Documents).

                                       16

<PAGE>


                  J. Other Loan Documents. The occurrence of an Event of Default
under  any of the Loan  Documents  other  than this  Agreement  or the Lease (as
"Event of Default" is defined therein).

                  K.  Lease.  The  occurrence  of an Event of Default  under the
Lease (as "Event of Default" is defined therein).

         7.2      General Remedies.

                  Notwithstanding  anything to the contrary  contained herein or
in any of the other Loan Documents,  upon the occurrence of any Event of Default
(i) at the option of Lender  upon  written  notice to  Borrower  as to  Sections
6.1(A)  through (C) and (F) through (I),  and  automatically  without  notice to
Borrower as to Sections 7.1(D), (E), (J) and (K), the unpaid principal amount of
the Loan,  all accrued and unpaid  interest  and all other  Secured  Obligations
shall become immediately due and payable, without presentment,  demand, protest,
further  notice  or other  requirements  of any kind,  all of which  are  hereby
expressly waived by Borrower,  (ii) Lender shall have the rights and remedies of
a  secured  party  under the  California  Commercial  Code,  and under any other
applicable  law,  (iii)  Lender  may  pursue  all of  its  rights  and  remedies
hereunder,  under the other  Loan  Documents,  at law,  in equity or  otherwise,
including without limitation, obtaining the appointment of a receiver, provided,
however,  that if Lender  seeks to exercise  its right of sale under the Deed of
Trust,  the purchaser of the Improvements  (including  Lender or its affiliates)
shall have the right to cause Borrower to enter into a lease (and Borrower shall
be deemed to have  elected  to enter  into such  lease) of the  Improvements  to
Borrower  in  accordance  with the rent  payment  as set forth in Article 9 (iv)
Lender may pursue any remedies  available to it pursuant to  California  Code of
Civil Procedure  Section 726.5,  (v) all outstanding  indebtedness and all other
amounts  owing to Lender  under the Loan  Documents  shall bear  interest at the
Default  Interest  Rate,  and (vi) Lender  shall have no further  obligation  to
disburse Loan proceeds to Borrower.

         7.3      Specific Performance.

                  Upon  the  occurrence  of an  Event  of  Default,  Lender  may
commence  and  maintain  an action in any court of  competent  jurisdiction  for
specific  performance of any of the covenants and agreements contained herein or
in any of the other Loan  Documents,  may obtain  the aid and  direction  of the
court in the performance of any of the covenants and agreements contained herein
or therein, and may obtain orders or decrees directing the same and, in the case
of any sale under the Deed of Trust, directing, confirming or approving Lender's
or the trustee's actions.

                                65535RT65535CLE 8

                                       17

<PAGE>


                            MISCELLANEOUS PROVISIONS

         8.1      Nonforeign Status.

                  Section 1445 of the Internal  Revenue Code of 1985, as amended
(the  "Internal  Revenue  Code")  and  Sections  18662,  18668  and 18669 of the
California  Revenue and Taxation Code (the "California Tax Code") provide that a
transferee of a U.S. real property interest, or California property interest, as
the case may be, must withhold tax under the circumstances described therein. To
inform Lender that the  withholding  of tax will not be required in the event of
the disposition of the Improvements  pursuant to the terms of the Deed of Trust,
Borrower hereby certifies, under penalty of perjury, that: (a) Borrower is not a
foreign corporation,  foreign  partnership,  foreign trust or foreign estate, as
those terms are defined in the Internal Revenue Code and/or  California Tax Code
and the regulations  promulgated  thereunder;  and (b) Borrower's U.S.  employer
identification number is the Tax Identification Number; (c) Borrower's principal
place of business is at the address set forth in Section 8.10,  and (d) Borrower
is qualified to do business in the State of California.  Lender may disclose the
contents  of this  Section  8.1 to the  Internal  Revenue  Service  or any other
Governmental Agency and Borrower acknowledges that any false statement contained
herein could be punished by fine,  imprisonment or both.  Borrower covenants and
agrees to execute further  certificates,  which shall be signed under penalty of
perjury,   as  Lender  shall   reasonably   require  in   connection   with  the
certifications set forth herein. The covenant set forth herein shall survive the
foreclosure  of the lien of the Deed of Trust or acceptance of a deed in lieu or
in aid thereof.

         8.2      Assignments and Participations in Loan and Note.

                  Lender may assign its  rights  and  delegate  its  obligations
under this  Agreement or any of the other Loan Documents and further may assign,
or sell  participations in, all or any part of the Loan, the Loan Documents,  or
any other interest herein or in the Note to any Person, all without notice to or
the consent of Borrower.  To the extent of any such assignment,  Lender shall be
relieved of its obligations with respect to the Loan and the assignee shall have
the  same  rights,  benefits  and  obligations  as it  would  if it were  Lender
hereunder  and a  holder  of  the  Note.  Lender  may  furnish  any  information
(including,   without   limitation,   financial   information)   concerning  the
Improvements, the Project, Borrower, Principals and any of their assets to third
parties from time to time for legitimate business purposes  (provided,  however,
that Lender shall use reasonable efforts to maintain the  confidentiality of any
information provided by Borrower of a proprietary nature).

         8.3      Expenses.

                                       18

<PAGE>


                  Borrower  agrees to pay,  within ten (10) days after demand by
Lender,  all  reasonable  costs and  expenses  (including,  without  limitation,
reasonable attorneys' fees and costs, fees of any consultants,  and fees for any
environmental audits, appraisal, inspections or other review required by Lender)
incurred  by Lender in  connection  with the  enforcement  of any of the Secured
Obligations,  the  enforcement of any of Lender's  rights and remedies under the
Loan  Documents,  the  collection of any payments  owing to Lender  hereunder or
under any of the other  Loan  Documents,  whether  or not such  enforcement  and
collection includes the filing of a lawsuit, or the retaking, holding, preparing
for sale or selling the  Improvements  or the  Personal  Property or any portion
thereof or any interest therein. Such costs and expenses shall include,  without
limitation,  Lender's  reasonable  attorneys' fees and costs,  including without
limitation  attorneys'  fees and costs incurred by Lender in connection with any
insolvency, bankruptcy, reorganization, arrangement or other similar proceedings
involving Borrower or any of the Principals which in any way affect the exercise
by Lender of its  rights  and  remedies  hereunder,  under any of the other Loan
Documents, at law or in equity.

         8.4      Joint and Several Obligations.

                  The liability of Borrower  under this Agreement and under each
of the other Loan Documents shall be joint and several.

         8.5      Indemnity.

                  In addition to the duties of indemnification  set forth in the
Lease,  Borrower  hereby  indemnifies and agrees to defend and hold harmless the
Indemnitees  from and  against any and all  expenses,  loss,  claims,  damage or
liability, including, without limitation, architects', engineers' and attorneys'
fees and  costs,  to the  extent  arising  from:  (a) any use,  nonuse,  misuse,
possession,  occupation,  alteration,  operation,  maintenance  or management by
Borrower of the Improvements or the Personal  Property or any part thereof;  (b)
any negligence or willful act or omission on the part of Borrower or its agents,
contractors,  servants,  employees,  licensees  or invitees;  (c) any  accident,
injury  (including  death) or damage to any person or  property  relating to the
use, nonuse, misuse, possession,  occupation, alteration, operation, maintenance
or  management  of the  Improvements  or the  Personal  Property;  (d)  any  tax
attributable  to the  execution,  delivery,  filing or  recording of the Deed of
Trust,  the Note or the other Loan Documents;  (e) any default under the Note or
the other Loan Documents,  or (f) any claim by or liability to any contractor or
subcontractor  performing work or any party  supplying  materials to Borrower in
connection with the Improvements or the Personal Property.

         8.6      Waiver of Offset.

                                       19

<PAGE>


                  All  sums  payable  by  Borrower  pursuant  to any of the Loan
Documents shall be paid without notice, demand, counterclaim,  setoff, deduction
or  defense  and  without  abatement,   suspension,   deferment,  diminution  or
reduction,  and the  obligations  and  liabilities  of  Borrower  under the Loan
Documents shall in no way be released,  discharged or otherwise affected (except
as expressly  provided in the Loan Documents) by reason of: (a) any damage to or
destruction of the  Improvements  or any  condemnation  or eminent domain action
affecting  the  Improvements  or  any  part  thereof;  (b)  any  restriction  or
prevention  of  or  interference  by  any  third  party  with  any  use  of  the
Improvements  or any part thereof;  (c) any title defect or  encumbrance  or any
eviction  from the Project or any part thereof by title  paramount or otherwise;
(d)  any  bankruptcy,  insolvency,   reorganization,   composition,  adjustment,
dissolution,  liquidation or other like  proceeding  relating to Lender,  or any
action  taken  with  respect  to any of the Loan  Documents  by any  trustee  or
receiver of Lender, or by any court, in any such proceeding; (e) any claim which
Borrower  has or might have  against  Lender;  (f) any default or failure on the
part of Lender to perform or comply with any of the terms hereof or of any other
agreement with Borrower; or (g) any other occurrence whatsoever, whether similar
or dissimilar  to the  foregoing;  whether or not Borrower  shall have notice or
knowledge of any of the foregoing. Except as expressly provided herein, Borrower
waives all rights now or  hereafter  conferred  by statute or  otherwise  to any
abatement, suspension,  deferment, diminution or reduction of any of the Secured
Obligations.

         8.7      Amendments and Waivers.

                  This  Agreement  and the  other  Loan  Documents  may  only be
modified  in  writing  signed by all of the  parties  hereto or thereto or their
respective  successors and assigns. No waiver of any provision of this Agreement
or of any of the other Loan  Documents,  or consent to any departure by Borrower
therefrom,  shall in any event be  effective  without the written  agreement  of
Lender.  Any waiver or consent shall be effective only in the specific  instance
and for the  specific  purpose  for  which it was  given.  Except  as  expressly
required by the terms of the Loan Documents,  no notice to or demand on Borrower
in any case shall entitle  Borrower to any other or further  notice or demand in
similar or other circumstances.

         8.8      WAIVER OF JURY TRIAL.

                  BORROWER  AND LENDER EACH HEREBY  KNOWINGLY,  VOLUNTARILY  AND
INTENTIONALLY WAIVE ANY RIGHT THEY MAY HAVE TO A TRIAL BY JURY IN RESPECT TO ANY
TORT OR CONTRACT  LITIGATION BASED HEREON OR ON ANY OF THE OTHER LOAN DOCUMENTS,
OR  ARISING  OUT OF,  UNDER OR IN  CONJUNCTION  WITH THE NOTE,  ANY  OTHER  LOAN
DOCUMENT,  OR ANY COURSE OF  CONDUCT,  COURSE OF  DEALING,  STATEMENTS  (WHETHER
VERBAL OR WRITTEN) OR ACTIONS OF EITHER PARTY IN CONNECTION THEREWITH.

                                       20

<PAGE>


         8.9      Submission of Loan Documents.

                  The  submission  of this  Agreement  or any of the other  Loan
Documents  to Borrower or its agents or attorneys  for review or signature  does
not constitute a commitment by Lender to make the Loan to Borrower, and the Loan
Documents  shall  have no  binding  force or effect  unless  and until  they are
executed  and  delivered by Borrower  and Lender and all of the  conditions  set
forth in Section 3.1 have been satisfied.

         8.10     Notices.

                  Any notice,  or other document or demand required or permitted
under  this  Agreement  or any of the other Loan  Documents  shall be in writing
addressed  to the  appropriate  address  set  forth  below  and  shall be deemed
delivered upon the earliest of (a) actual receipt,  (b) confirmation of delivery
by telecopy  (provided that a copy is subsequently  delivered by regular mail or
overnight  delivery),  (c) the next  Business  Day  after  the date when sent by
recognized overnight courier, or (c) the second Business Day after the date when
sent by registered or certified mail, postage prepaid.  Any party may, from time
to time,  change the address at which such written notice or other  documents or
demands are to be sent, by giving the other party written  notice of such change
in the manner hereinabove provided.

         To Borrower:               Matrix Pharmaceutical, Inc.
                                    4757 Nexus Centre Drive
                                    San Diego, California 92121
                                    Attention: Mr. Ron Lucas
                                    Telephone: (619) 824-5121
                                    Facsimile: (619) 643-5699

         With A Copy To:            Brobeck, Phlegar & Harrison
                                    550 W. "C" Street, Suite 1300
                                    San Diego, California 92101
                                    Attention: Scott Biel, Esq.
                                    Telephone: (619) 699-0289
                                    Facsimile: (619) 234-3848

         To Lender:                 ARE-4757 Nexus Centre, LLC
                                    135 N. Los Robles Avenue, Suite 250
                                    Pasadena, California 91101
                                    Attention:  Corporate Secretary

                                       21

<PAGE>


                                    Telephone:  (626) 578-0777
                                    Facsimile:  (626) 578-0770

         With A Copy to:            Alexandria Real Estate Equities, Inc.
                                    11440 West Bernardo Court, Suite 170
                                    San Diego, California  92127
                                    Attention:  Gary A. Kreitzer, Esq.
                                    Telephone:  (619) 592-6801
                                    Facsimile:    (619) 592-6814

         With A Copy To:            Skadden, Arps, Slate, Meagher & Flom LLP
                                    300 South Grand Avenue, Suite 3400
                                    Los Angeles, California  90071
                                    Attention:  George M. Eshaghian, Esq.
                                    Telephone:  (213) 687-5215
                                    Facsimile:  (213) 687-5600

         8.11     Survival of Warranties and Certain Agreements.

                  All agreements,  indemnities,  representations  and warranties
made herein and in the other Loan  Documents  shall  survive the  execution  and
delivery of this  Agreement,  the making of the Loan hereunder and the execution
and  delivery  of the Note.  All  representations  and  warranties  made in this
Agreement or in any of the other Loan  Documents  shall further  survive any and
all investigations and inquiries made by Lender,  shall remain true, correct and
complete in all material  respects and shall remain  continuing  obligations  so
long  as  any  portion  of  the  Secured   Obligations  remains  outstanding  or
unsatisfied.  Notwithstanding  anything  in this  Agreement  or the  other  Loan
Documents or implied by law to the contrary, any indemnities made by Borrower in
the Loan Documents  shall survive the payment of the Loan, the  satisfaction  of
the Secured  Obligations,  and/or the termination of this Agreement or the other
Loan Documents.

         8.12     Failure or Indulgence Not Waiver; Remedies Cumulative.

                  No failure or delay on the part of Lender or any holder of the
Note or  portion  thereof  in the  exercise  of any  power,  right or  privilege
hereunder  or under the Note shall  impair such power,  right or privilege or be
construed to be a waiver of any default or acquiescence  therein,  nor shall any
single or partial exercise of any such power,  right or privilege preclude other
or further  exercise  thereof or of any other  right,  power or  privilege.  All
rights and remedies  existing  under this Agreement and the other Loan Documents
are

                                       22

<PAGE>


separate,  distinct  and  cumulative  to,  and not  exclusive  of, any rights or
remedies otherwise  available at law or in equity. No act of Lender under any of
the Loan  Documents  shall be construed as an election to proceed  under any one
provision to the exclusion of any other provision,  notwithstanding  anything in
the Loan Documents to the contrary.  Borrower  expressly waives all right to the
benefit  of any  statute  of  limitations  and  any  moratorium,  reinstatement,
marshaling, forbearance, extension, redemption, or appraisement now or hereafter
provided by federal or state law, as a defense to any demand against Borrower to
the fullest extent permitted by law.

         8.13     Survival of Obligations Upon Termination of Agreement.

                  No  termination  or  cancellation   (regardless  of  cause  or
procedure) of this Agreement or any of the other Loan Documents shall in any way
affect or impair the powers,  obligations,  duties,  rights,  and liabilities of
Borrower or Lender  relating to (a) any  transaction or event occurring prior to
such termination or cancellation,  or (b) any of the  undertakings,  agreements,
covenants,  indemnities,  warranties and  representations  of Borrower or Lender
contained in this Agreement or any of the other Loan Documents.

         8.14     Disbursements in Excess of Loan Amount.

                  In the event  the total  disbursements  by Lender  exceed  the
amount of the Loan set forth herein,  the total of all  disbursements  shall, to
the extent permitted by the laws of the State of California,  constitute part of
the  Secured  Obligations  and be  secured  by the Deed of Trust and other  Loan
Documents.  All other sums expended by Lender  pursuant to this Agreement or any
of the other Loan  Documents  shall be deemed to have been paid to Borrower  and
shall be secured by the Loan Documents.

         8.15     Severability.

                  If any  term  of  this  Agreement  or any  of the  other  Loan
Documents or the application  thereof to any person or circumstances,  shall, to
any extent,  be invalid or  unenforceable,  the  remainder of this  Agreement or
other Loan Document or the application of such term to persons or  circumstances
other  than  those as to which it is  invalid  or  unenforceable,  shall  not be
affected  thereby,  and each term of this Agreement or other Loan Document shall
be valid and enforceable to the fullest extent.

         8.16     Rules of Construction.

                  Where the identity of the parties to this  Agreement or any of
the other Loan

                                       23

<PAGE>


Documents  or the  circumstances  make  it  appropriate,  the  masculine  gender
includes the  feminine  and/or  neuter,  and the  singular  number  includes the
plural.  Article  and  Section  headings  in this  Agreement  and the other Loan
Documents  are  included  for  convenience  of  reference  only  and  shall  not
constitute a part of this  Agreement or such other Loan  Documents for any other
purpose or be given any substantive  effect.  The recitals to this Agreement and
to each of the other Loan Documents are incorporated herein and therein and made
a part hereof and thereof.

         8.17     Applicable Law.

                  This Agreement and the other Loan Documents  shall be governed
by, and  construed  and enforced in  accordance  with,  the laws of the State of
California.

         8.18     Successors and Assigns.

                  This  Agreement  shall be binding  upon and shall inure to the
benefit of the parties hereto and their respective successors an assigns. Except
as expressly provided in the Loan Documents (including,  without limitation, the
Lease), Borrower's rights and obligations or any interest hereunder or under any
of the other Loan Documents may not be assigned,  including without  limitation,
assigned  for security  purposes,  without the prior  written  consent of Lender
which may be  withheld  in  Lender's  sole  discretion,  and any such  purported
assignment  shall be null and void ab initio.  As used herein,  and in the other
Loan Documents, "Lender" (or similar references to the lender) shall include all
holders  of the  Note,  including,  without  limitation,  pledgees  of the Note,
whether or not named herein or therein.  In exercising  any rights  hereunder or
under any of the other Loan Documents or taking any actions  provided for herein
or  therein,  Lender  may act  through  its  employees,  agents  or  independent
contractors authorized by Lender.

         8.19     Disclosure of Information.

                  Borrower hereby  acknowledges and agrees that upon the request
of any partner,  member or  shareholder of Borrower,  as applicable,  Lender may
disclose to such party any information (including, without limitation, financial
information) relating to the Loan and Borrower's  performance of its obligations
under the Loan Documents.  Borrower hereby  indemnifies and agrees to defend and
hold  harmless  the  Indemnitees  from and against any and all  expenses,  loss,
claims, damage or liability, including, without limitation,  attorneys' fees and
costs,  arising by reason of any  disclosure of information by Lender under this
Section 8.19.

                                       24

<PAGE>


         8.20     Counterparts.

                  This Agreement and the other Loan Documents may be executed in
any number of  counterparts,  each of which when so executed and delivered shall
be deemed to be an original and all of which  counterparts  taken together shall
constitute  but one and the  same  instrument.  Signature  and,  if  applicable,
acknowledgment  pages may be detached  from the  counterparts  and attached to a
single copy of the applicable  document to physically  form one document,  which
may be recorded if applicable.

         8.21     Entire Agreement.

                  The Loan Documents set forth the entire understanding  between
Borrower  and  Lender  relative  to the Loan and the same  supersede  all  prior
agreements and understandings relating to the subject matter hereof or thereof.

         8.22     Inconsistencies.

                  In the event it is  impossible to  simultaneously  comply with
the terms of this Agreement and any of the terms of any other Loan Document, the
terms of this Agreement  shall control over any  inconsistent  term of any other
Loan Document.

         8.23     Time is of the Essence.

                  Time is  strictly  of the  essence of this  Agreement  and the
other Loan Documents.

         8.24     No Third Party Beneficiaries.

                  This  Agreement  and the  other  Loan  Documents  are made and
entered into for the sole  protection  and benefit of the parties  hereto,  and,
except as provided in Section  8.18, no other person or entity shall be a direct
or indirect beneficiary of, or shall have any direct or indirect cause of action
or claim in connection with, this Agreement or any of the other Loan Documents.

                                65535RT65535CLE 9
                               PUT RIGHT & OPTION

         9.1  Borrower  shall have the right at any time  prior to the  Maturity
Date,  upon  delivery of written  evidence  reasonably  satisfactory  to Lender,
together with such supporting

                                       25

<PAGE>


documentation  and  certificates  as  Lender  may in its good  faith  discretion
require,  that Borrower has completed strategic alliances or joint ventures with
a  cumulative  value in  excess of  $10,000,000,  as  measured  by  initial  and
milestone  payments  received by Borrower  from  unaffiliated  joint  venture or
alliance  partners,  and provided that no Event of Default or Potential  Default
exists,  to cause  Lender to  purchase  an  undivided  one-half  interest in the
Improvements  in exchange for one-half of the outstanding  principal  balance of
the Loan (up to  $3,000,000).  In the event that Borrower  exercises such right,
Borrower shall, as a condition precedent to the transfer, execute and deliver to
Lender such instruments,  agreements and title endorsements (including,  without
limitation,  deeds,  assignments and other  conveyance  documents) as Lender may
reasonably  request  in  order  to  convey  good  and  marketable  title  to the
Improvements  to be conveyed to Lender,  together with an amendment to the Lease
in form and substance  acceptable to Lender in its discretion  whereby  Borrower
shall  lease  back  from  Lender  the  Improvements  so  conveyed  and the  rent
thereunder shall be increased by $330,000 per annum,  payable in the same manner
(and subject to the same adjustments) as Basic Annual Rent thereunder.

         9.2 Borrower shall have right at any time  subsequent to the sale of an
undivided  one-half  interest in the  Improvements to Lender pursuant to Section
9.1 above but prior to the Maturity  Date, and provided that no Event of Default
or  Potential  Default  exists,  upon  delivery of written  evidence  reasonably
satisfactory  to  Lender,  together  with  such  supporting   documentation  and
certificates as Lender may in its good faith discretion require, that either (a)
Borrower has completed  strategic  alliances or joint ventures with a cumulative
value in excess of  $15,000,000,  as measured by initial and milestone  payments
received by Borrower from unaffiliated  joint venture or alliance  partners,  or
(b) Borrower's net sales from products for the immediately preceding fiscal year
(as reported in Borrower's  most recent public  filings with the  Securities and
Exchange Commission) were no less than $10,000,000,  to cause Lender to purchase
the  remaining  interest  in the  Improvements  in  exchange  for the  remaining
outstanding principal balance of the Loan (up to $3,000,000).  In the event that
Borrower exercises such right,  Borrower shall, as a condition  precedent to the
transfer,  execute and deliver to Lender such instruments,  agreements and title
endorsements  (including,  without  limitation,  deeds,  assignments  and  other
conveyance  documents) as Lender may reasonably  request in order to convey good
and marketable title to the Improvements to be conveyed to Lender, together with
an  amendment  to the Lease in form and  substance  acceptable  to Lender in its
discretion  whereby  Borrower shall lease back from Lender the  Improvements  so
conveyed and the rent  thereunder  shall be increased by an additional  $330,000
per annum,  payable in the same manner (and subject to the same  adjustments) as
Basic Annual Rent thereunder.

         9.3 Lender shall have the right at any time prior to the Maturity Date,
upon

                                       26

<PAGE>


delivery of written notice to Borrower, to purchase the Improvements in exchange
for the outstanding  principal  balance of the Loan (up to  $6,000,000).  In the
event that Lender  exercises  such right,  Borrower shall execute and deliver to
Lender such instruments,  agreements and title endorsements (including,  without
limitation,  deeds,  assignments and other  conveyance  documents) as Lender may
reasonably  request  in  order  to  convey  good  and  marketable  title  to the
Improvements  to Lender,  together  with an  amendment  to the Lease in form and
substance  acceptable to Lender in its discretion  whereby  Borrower shall lease
back from Lender the  Improvements so conveyed and the rent thereunder  shall be
increased by $660,000 per annum,  payable in the same manner (and subject to the
same adjustments) as Basic Annual Rent thereunder.

                                       27

<PAGE>


                  IN WITNESS WHEREOF,  this Agreement has been duly executed and
delivered Borrower and Lender as of the date first above written.

                                           BORROWER:

                                           MATRIX PHARMACEUTICAL, INC.,
                                           a Delaware corporation



                                           By:  /s/ Ronald P. Lucas
                                                --------------------------------
                                              Its:  Vice President of Operations
                                                    ----------------------------


                                           By:
                                                --------------------------------
                                              Its:
                                                    ----------------------------


                                           LENDER:

                                           ARE-4757 NEXUS CENTRE, LLC,
                                           a Delaware limited liability company

                                           By:  ALEXANDRIA REAL ESTATE EQUITIES,
                                                L.P., a Delaware limited 
                                                partnership, managing member

                                                By: ARE-QRS CORP., a Maryland
                                                    corporation, general partner


                                                  By:  /s/ Peter Nelson
                                                       -------------------------
                                                   Its:  Chief Financial Officer
                                                        ------------------------


<PAGE>


                                    EXHIBIT A

                             Description of Project


That  certain  real  property  located in the City of San  Diego,  County of San
Diego, State of California,  having a street address of 4757 Nexus Centre Drive,
more particularly described as follows:


         Parcel 1 of  Parcel  Map  17892 in the City and  County  of San  Diego,
         according  to Map filed in the  Office of the County  Recorder  of said
         county on August 6, 1997.

                                      A-1

<PAGE>


                                   EXHIBIT B-1

                            Manufacturing Suite Plans

                                     B-1-1

<PAGE>


                                   EXHIBIT B-2

                DESCRIPTION OF EXCLUDED IMPROVEMENTS AND FIXTURES


Production Equipment Design Requirements

MEP Design-TKG
MEP Design-TKG
Architectural Design-WHL
Civil Design-Latitude 33
Structural Design-Hope Eng.


Production Equipment

WFI System including tanks, pumps, valve, controls
RQ/DI Water Equipment
Air Handler No. 12
Cargocaire Unit
Pure Steam Generator Drip Legs


Production Equipment Contractor Work (Labor, Overhead & Profit)

Work Performed by Contractor
Site Management
Site Requirements
Contractor Fee


Production  Equipment   Subcontractor  Work  (Installation,   Material  &  Labor
Requirements)

Site Utilities
Doors/Frames/Hardware
Drywall/Taping & Painting
Flooring/Walls-Mipolam, VCT, Sheet Vinyl
Stainless Steel Casework
Kolpak Cold Box w/Honeywell Trueline Recorder
HVAC
Plumbing Systems
Process Utilities
Process Controls
Electrical


Production Facility Scope of Work Changes

Boroscoping



<PAGE>


                                    EXHIBIT C

                        Description of Personal Property

         All of Borrower's right, title and interest, now or hereafter acquired,
in and to the following;  provided, however, that none of the following shall be
construed to include any of those items of personal  property  listed on Exhibit
B-2 to this Agreement, or the proceeds therefrom:

         (a) All personal property  (including,  without limitation,  all goods,
supplies,  equipment,   furniture,   furnishings,   machinery  and  construction
materials)  which  Borrower  now or hereafter  owns or in which  Borrower now or
hereafter  acquires an interest or right,  which are now or hereafter located on
or affixed to the Project and are used or useful in the maintenance or operation
of any of the  Improvements,  together with and all books,  records,  leases and
other  documents,  of  whatever  kind  or  character,  relating  to  any  of the
foregoing;

         (b) All fees,  income and rents which,  after the date hereof and while
any portion of the Secured  Obligations  remains unpaid,  may accrue from any of
the personal property described in paragraph (a) of this Exhibit C, or which may
be  received  or  receivable  by Borrower  from any  hiring,  letting,  leasing,
subhiring, subletting, or subleasing therefor;

         (d)  All  other   intangible   property  and  rights  relating  to  the
Improvements or Borrower's  operation thereof, or used in connection  therewith,
including but not limited to all governmental permits owned by Borrower relating
to  construction of the  Improvements,  and all permits,  licenses,  franchises,
approvals and variances  relating in any way to, or to the operation,  ownership
and use of, the Improvements;

         (e) All judgments,  claims,  settlements of claims and causes of action
under any legal proceeding  relating to Borrower's  interest in the Improvements
or Borrower's use, occupancy or operation thereof;

         (f) All proceeds from sale or disposition of the Personal Property;

         (g)  Borrower's  rights  under  all  insurance  policies  covering  the
Improvements  or  any of the  Personal  Property  (whether  or not  Borrower  is
required to maintain such insurance under the terms of the Loan Documents),  and
all proceeds, loss payments and premium refunds payable regarding the same;

         (h) All reserves,  deferred payments,  deposits,  refunds, cost savings
and payments

                                      C-1

<PAGE>


of any kind relating to the construction of any Improvements;

         (i) All causes of action,  claims,  compensation and recoveries for any
damage  to or  condemnation  or  taking  of the  Improvements  or  the  Personal
Property,   or  for  any   conveyance  in  lieu  thereof,   whether   direct  or
consequential,  or for any damage or injury to the  Improvements or the Personal
Property,  or for any loss or  diminution  in value of the  Improvements  or the
Personal Property;

         (j) All architectural, structural, mechanical and engineering plans and
specifications  prepared for construction of Improvements and all studies,  data
and drawings  related  thereto,  and all  contracts  and  agreements of Borrower
relating to such plans and  specification or such studies,  data and drawings or
to the construction of Improvements;

         (k) All of Borrower's  present and future rights in and to all refunds,
rebates,  reimbursements,  reserves, deferred payments,  deposits, cost savings,
governmental   subsidy  payments,   governmental-registered   credits  (such  as
emissions reduction credits),  other credits,  waivers and payments,  whether in
cash or kind, due from or payable by any Governmental Agency or any insurance or
utility  company  relating to any or all of the  Improvements  or arising out of
satisfaction of any condition imposed upon or the obtaining of any approvals for
the development of the Improvements;

         (l) All of Borrower's  present and future rights in and to all refunds,
rebates, reimbursements, credits and payments of any kind due from or payable by
any  Governmental  Agency  or  other  entity  for  any  taxes,   special  taxes,
assessments,  or similar  governmental or  quasi-governmental  charges or levies
imposed upon  Borrower  with respect to the  Improvements  or arising out of the
satisfaction of any condition imposed upon or the obtaining of any approvals for
the development of the Improvements;

         (m)      All Borrower's rights in proceeds of the Loan;

         (n) All Borrower's  rights to receive the proceeds of any "take-out" or
permanent financing or commitment to provide such financing; and

         All terms used herein  which are defined in the  California  Commercial
Code shall have the same meanings when used herein,  unless the context requires
otherwise.

                                      C-2

<PAGE>


                                   EXHIBIT D

                            Form of Promissory Note

                            SECURED PROMISSORY NOTE

$6,000,000.00                                              San Diego, California
                                                           as of March __, 1998

         FOR VALUE RECEIVED, MATRIX PHARMACEUTICAL, INC., a Delaware corporation
(the "Maker"),  promises to pay, on or before the "Due Date" (as defined below),
to the order of ARE4-757 NEXUS CENTRE, LLC, a Delaware limited liability company
or its designee (the "Holder"),  having an address at c/o Alexandria Real Estate
Equities, Inc., 135 N. Los Robles Avenue, Suite 250, Pasadena, California 91101,
at said address or in accordance  with such other  instructions  or place as the
Holder may hereafter  designate from time to time in writing,  the principal sum
of SIX MILLION  DOLLARS  ($6,000,000.00)  in lawful money of the United  States,
with  interest on the  "Principal  Balance" (as defined  below) from the date of
this Secured  Promissory  Note (this  "Note") to and including the date on which
this Note is paid in full, calculated in the manner hereinafter set forth.

         1.  As used  herein,  the  term  "Principal  Balance"  shall  mean  the
outstanding principal balance of this Note from time to time.

         2. The entire  Principal  Balance  shall bear  interest  at the rate of
eleven percent (11%) per annum,  calculated on the basis of the actual number of
days elapsed over a 365 day year.  Interest only on the Principal  Balance shall
be payable monthly, in arrears, commencing on the last day of the month in which
this Note is executed  and  thereafter  on the last  business  day of each month
until paid in full.  All  accrued  and  unpaid  interest,  and any other  unpaid
charges accruing or due hereunder,  shall be added to the Principal Balance on a
monthly basis.



<PAGE>


         3. The entire unpaid Principal  Balance,  together with all accrued and
unpaid interest thereon,  shall be due and payable on the date which is four (4)
calendar years from the date of this Note (the "Due Date").

         4. This Note is subject to the express  condition that at no time shall
the Maker be  obligated  or required to pay  interest on any amount  outstanding
hereunder  at a rate which could  subject the Holder to either civil or criminal
liability as a result of such rate being in excess of the maximum rate which the
Maker is  permitted  by law to contract or agree to pay. If by the terms of this
Note the Maker is at any time  required  or  obligated  to pay  interest  on any
amount outstanding  hereunder at a rate in excess of such maximum rate, the rate
of interest  under this Note shall be deemed to be  immediately  reduced to such
maximum rate and interest  payable  hereunder  shall be computed at such maximum
rate and the portion of all prior  interest  payments in excess of such  maximum
rate shall be applied and shall be deemed to have been  payments in reduction of
the principal amount outstanding hereunder.

         5. The Maker hereby waives  presentment and demand for payment,  notice
of dishonor,  protest and notice of protest of this Note,  and agrees to pay all
costs of  collection  when  incurred,  including  attorneys'  fees,  charges and
disbursements  (which  amounts  shall  be added to the  Principal  Balance).  No
extension of time for payment of this Note or any installment hereunder,  and no
alteration,  amendment or waiver of any provision of this Note,  shall  release,
discharge, modify, change or affect the liability of the Maker hereunder.

         6. Maker may make full or partial  prepayment of the Principal  Balance
together  with accrued and unpaid  interest  thereon at any time or from time to
time without  penalty or charge,  upon at least 30 days' prior written notice to
Holder.

         7. All payments  received  hereunder  shall be applied first to accrued
interest,  then to any due and unpaid  charges  incurred by Holder in connection
with this Note and thereafter to a reduction of the Principal Balance.

         8. In the event of any  default by Maker  under the terms of this Note,
time being of the  essence,  Holder may,  in  addition  to any other  rights and
remedies which Holder may have  hereunder,  at law, in equity,  pursuant to: (a)
that certain Loan and  Security  Agreement of even date  herewith by and between
Maker and Holder (the "Loan Agreement"); (b) that certain Lease of even date

                                       2

<PAGE>


herewith by and between Holder, as landlord, and Maker, as tenant (the "Lease");
(c) that certain Deed of Trust and Fixture Filing of even date herewith executed
by Maker, as trustor, to Chicago Title Insurance Company, as trustee, and naming
Holder,  as  beneficiary,  to be recorded  concurrently  herewith  (the "Deed of
Trust");  and (d) that certain California UCC-1 Financing Statement of even date
herewith to be filed with the California Secretary of State, together with UCC-1
Financing   Statements   for  such  other  States  as  are  required  by  Holder
(collectively,  the "Financing  Statement") (the Loan Agreement,  the Lease, the
Deed of Trust and the Financing Statement are herein collectively referred to as
the "Loan Documents"), or otherwise, at any time following such default, without
waiving  any other  rights or  remedies  available  to it,  declare  the  entire
Principal  Balance,  accrued  interest and all other amounts  payable under this
Note,  immediately due and payable,  and the entire sum shall thereby become due
and payable.

         9. If any action is brought in connection with or to enforce this Note,
or if this Note is placed in the hands of an attorney  or agent for  collection,
Maker shall pay all costs,  fees and disbursements of such action or collection,
including,   without  limitation,   reasonable   attorneys'  fees,  charges  and
disbursements,  and all such  sums  shall be  added  to and  become  part of the
Principal Balance as and when incurred.

         10. This Note is the promissory  note referred to in the Loan Agreement
and is secured by the Deed of Trust.

         11. This Note and Maker's  obligations  hereunder and under each of the
other Loan Documents are intended to be, and shall be,  recourse  obligations of
Maker,  and Holder  shall have full  recourse  to Maker and all of its assets in
connection with any default hereunder or under any of the other Loan Documents.

         12. The terms of this Note shall be governed by and construed under the
laws of the State of California.

         13. This Note may not be amended or terminated  orally,  but only by an
agreement in writing executed by the Holder.

                                       3

<PAGE>


         IN WITNESS  WHEREOF,  the Maker has duly  executed  this Note as of the
date first above written.

                                                    MAKER:

                                                    MATRIX PHARMACEUTICAL, INC.,
                                                    a Delaware corporation

                                                    By: ________________________
                                                       Name: ___________________
                                                       Its: ____________________

                                       4

<PAGE>


                                  EXHIBIT "E"
                                Permitted Liens

                            EXCEPTIONS FROM COVERAGE

     This policy does not insure  against  loss or damage (and the Company  will
not pay costs, attorneys' fees or expenses) which arise by reason of:

A    1. PROPERTY TAXES,  INCLUDING ANY  ASSESSMENTS  COLLECTED WITH TAXES, TO BE
        LEVIED FOR THE FISCAL YEAR 1998-99 THAT ARE A LIEN NOT YET DUE.

B    2. THE  LIEN OF  SUPPLEMENTAL  TAXES,  IF  ANY,  ASSESSED  PURSUANT  TO THE
        PROVISIONS  OF CHAPTER 3.5  (COMMENCING  WITH SECTION 75) OF THE REVENUE
        AND TAXATION CODE OF THE STATE OF CALIFORNIA.

C    3. THE FACT THAT THE  OWNERSHIP  OF SAID LAND  DOES NOT  INCLUDE  RIGHTS OF
        ACCESS TO OR FROM THE STREET OR HIGHWAY  ABUTTING SAID LAND, SUCH RIGHTS
        HAVING BEEN SEVERED FROM SAID LAND BY THE DOCUMENT.

        RECORDED: APRIL 8, 1969 AS FILE NO. 59708, OFFICIAL RECORDS

        AFFECTS:  IN AND TO  I-805  FREEWAY,  BEING A  PORTION  OF THE  EASTERLY
                  BOUNDARY OF PARCEL 2 AS SHOWN ON PARCEL MAP 17892.

D    4. THE RIGHTS,  AS A  "RESTRICTIVE  USE EASEMENT" AS RESERVED BY THE UNITED
        STATES OF AMERICA IN DEED DATED JULY 21, 1983 AND RECORDED JULY 28, 1983
        AS FILE NO. 83-261437.

        REFERENCE IS MADE TO SAID DOCUMENT FOR FULL PARTICULARS.

        THE EXACT  LOCATION  AND EXTENT OF SAID  EASEMENT  IS NOT  DISCLOSED  OF
        RECORD.

E    5. A  RESTRICTIVE  USE  EASEMENT  IN  PERPETUITY  FOR  THE   ESTABLISHMENT,
        MAINTENANCE,  OPERATION AND USE OF A SAFETY AREA OF COMPATIBLE  USE ZONE
        IN CONNECTION WITH THE OPERATION OF THE NAVAL AIR  STATION  MIRAMAR  AND
        INCIDENTAL PURPOSES, IN FAVOR OF UNITED STATES OF AMERICA, RECORDED JULY
        JULY 28, 1983 AS FILE NO. 83-261438 OF OFFICIAL RECORDS.

        REFERENCE IS MADE TO SAID DOCUMENT FOR FULL PARTICULARS.

        THE EXACT  LOCATION  AND EXTENT OF SAID  EASEMENT  IS NOT  DISCLOSED  OF
        RECORD.

F    6. COVENANTS,  CONDITIONS  AND  RESTRICTIONS  (BUT OMITTING ANY COVENANT OR
        RESTRICTIONS BASED ON RACE, COLOR,  RELIGION,  SEX,  HANDICAP,  FAMILIAL
        STATUS, OR NATIONAL ORIGIN) AS SET FORTH IN THE DOCUMENT.

        RECORDED: JULY 28, 1983 AS FILE NO. 83-261430, OFFICIAL RECORDS

G    7. PLANNING  DIRECTOR  RESOLUTION NO. 7493 PD GRANTING  PLANNED  INDUSTRIAL
        DEVELOPMENT PERMIT NO. 87-1049 AMENDMENT TO PID PERMIT NO. 86-0967.

<PAGE>

        RECORDED JUNE 14, 1988 AS FILE NO. 88-283002.

H    8. AN OFFER OF  DEDICATION  TO PUBLIC USE OF, A PORTION OF SAID LAND,  SAID
        OFFER WAS  REJECTED  ON SAID MAP,  BUT IS SUBJECT  TO FUTURE  ACCEPTANCE
        UNDER THE PROVISIONS OF SECTION NUMBER 66477.2 OF THE GOVERNMENT CODE OF
        THE STATE OF CALIFORNIA.

        DESIGNATED ON
        MAP NO.:            12473
        AS:                 RESERVED FOR FUTURE STREET
        AFFECTS:            A PORTION OF PARCEL 2 AS SHOWN ON PARCEL MAP 17892

I    9. AN EASEMENT FOR THE PURPOSE SHOWN BELOW AND RIGHTS INCIDENTAL THERETO AS
        SHOWN ON MAP OF SAID TRACT.

        EASEMENT
        PURPOSE:            SEWER, DRAINAGE, SLOPE
        AFFECTS:            AS SHOWN ON SAID MAP NO. 12473
        
        NOTE: A PORTION OF SAID EASEMENT WAS ABANDONED ON PARCEL MAP 17892.

J   10. AN EASEMENT FOR THE PURPOSE SHOWN BELOW AND RIGHTS INCIDENTAL THERETO AS
        SET FORTH IN A DOCUMENT

        GRANTED TO:         SAN DIEGO GAS & ELECTRIC COMPANY
        PURPOSE:            PUBLIC UTILITIES, INGRESS AND EGRESS
        RECORDED:           DECEMBER 27, 1989 AS FILE NO. 89-699805, OFFICIAL 
                            RECORDS
        AFFECTS:            THE EXACT LOCATION AND EXTENT OF SAID EASEMENT IS 
                            NOT DISCLOSED OF RECORD.

K       RESTRICTIONS  ON THE USE,  BY THE OWNERS OF SAID LAND,  OF THE  EASEMENT
        AREA AS PROVIDED IN THE DOCUMENT REFERRED TO ABOVE.

N   11.  AN AGREEMENT  BETWEEN THE CITY OF SAN DIEGO AND NEXUS  CENTRE/I-805,  A
         CALIFORNIA LIMITED  PARTNERSHIP,  OWNER,  RECORDED FEBRUARY 20, 1992 AS
         FILE NO.  92-0091575,  OFFICIAL RECORDS,  RELATING TO THE INSTALLATION,
         MAINTENANCE  AND POSSIBLE  REMOVAL OF 6" PRIVATE  SEWER LATERAL AND 12"
         PRIVATE DRAINAGE PIPE.

N    12. PROVISIONS, HEREIN RECITED, OF THE DEDICATION STATEMENT ON THE

MAP NO:                     PARCEL MAP 16892 AND 17892
PROVISIONS:                 THIS IS A MAP OF A PLANNED INDUSTRIAL DEVELOPMENT
                            PROJECT AS DEFINED IN CHAPTER X, ARTICLE I, DIVISION
                            9 OF THE SAN DIEGO MUNICIPAL CODE.

                             Exhibit "E" (Continued)
<PAGE>

O    13. A PENDING  ASSESSMENT FOR THE DISTRICT SHOWN BELOW.  WHEN NOTICE OF THE
         ASSESSMENT IS  RECORDED WITH THE COUNTY  RECORDER THE ASSESSMENT  SHALL
         BECOME A LIEN ON SAID LAND.

     DISTRICT:  DISTRICT  DIAGRAM  OF NORTH  UNIVERSITY  CITY  AMENDED  DISTRICT
                DIAGRAM  FACILITIES BENEFIT ASSESSMENT IN THE CITY OF SAN DIEGO,
                COUNTY OF SAN DIEGO, STATE OF CALIFORNIA
        
        DISCLOSED BY:       ASSESSMENT DISTRICT DIAGRAM AMENDED
        RECORDED:           AUGUST 9, 1994 AS FILE NO. 1994-0485272, OFFICIAL
                            RECORDS
        
P        NOTICE OF ASSESSMENT  RECORDED OCTOBER 1, 1991 AS FILE NO.  1991-506423
         AS AUGUST 9, 1994 AS FILE NO. 1994-0485273, OFFICIAL RECORDS

Q    14. AN EASEMENT FOR THE PURPOSE SHOWN BELOW AND RIGHTS  INCIDENTAL  THERETO
         AS SET FORTH IN A DOCUMENT

        GRANTED TO:         CITY OF SAN DIEGO
        PURPOSE:            TUNNEL OR TUNNELS FOR UTILITY PURPOSES
        RECORDED:           MARCH  3,  1995 AS FILE NO.  1995-0093861,  OFFICIAL
                            RECORDS
        AFFECTS:            THE ROUTE THEREOF AFFECTS A PORTION OF SAID LAND AND
                            IS MORE FULLY DESCRIBED IN SAID DOCUMENT.

R    15. AN AGREEMENT  BETWEEN THE CITY OF SAN DIEGO AND MATRIX  PHARMACEUTICAL,
         INC., A DELAWARE  CORPORATION,  OWNER,  RECORDED APRIL 24, 1997 AS FILE
         NO.  1997-0189196 OF OFFICIAL  RECORDS.  RELATING TO THE  INSTALLATION,
         MAINTENANCE  AND POSSIBLE  REMOVAL OF TRASH  ENCLOSURE,  WATER SERVICE,
         PAVEMENT AND LANDSCAPING.

S    16. ANY RIGHTS,  INTEREST,  OR CLAIMS WHICH MAY EXIST OR ARISE BY REASON OF
         THE FOLLOWING FACTS.

        A) IMPROVEMENTS  LIE WITHIN THE  RESTRICTIVE USE EASEMENT  RECORDED JULY
        21, 1983 AS FILE NO. 83-261437.

        B) A BUILDING,  CURBS, DECORATIVE CONCRETE, WALLS & STAIRS ENCROACH ONTO
        THE EASEMENT FOR WATER, SEWER, DRAINAGE AND SLOPE SHOWN ON MAP 12473.

T       17. AN  EASEMENT  FOR THE  PURPOSE  SHOWN  BELOW AND  RIGHTS  INCIDENTAL
        THERETO AS SHOWN OR AS OFFERED FOR  DEDICATION ON THE RECORDED MAP SHOWN
        BELOW.

        MAP NO:             PARCEL MAP 17892 EASEMENT
        PURPOSE:            24' WIDE WATER EASEMENT
        AFFECTS:            AS SHOWN ON SAID MAP

                             Exhibit "E" (Continued)

<PAGE>

AB   19. AN UNRECORDED LEASE AFFECTING THE PREMISES HEREIN  DESCRIBED,  EXECUTED
         BY AND BETWEEN THE PARTIES HEREIN NAMED, WITH CERTAIN TERMS, COVENANTS,
         CONDITIONS AND PROVISIONS SET FORTH THEREIN.

        LESSOR:        ARE-4757 NEXUS CENTRE, LLC
        LESSEE:        MATRIX PHARMACEUTICAL, INC.
        DISCLOSED BY:  MEMORANDOM OF LEASE (PARKING LEASE)
        RECORDED:      ----

AC   21. A   DOCUMENT   ENTITLED   "DECLARATION   OF   RECIPROCAL    EASEMENTS,"
         DATED-EXECUTED  BY  MATRIX  PHARMACEUTICAL,  INC.,  SUBJECT  TO ALL THE
         TERMS, PROVISIONS AND CONDITIONS THEREIN CONTAINED, RECORDED-.


                            Exhibit "E" (Continued)






Matrix  Pharmaceutical,  Inc.  v.  Chubb  Custom  Ins.  Co.,  et al.  Settlement
Agreement

                            SETTLEMENT AGREEMENT AND
                          RELEASE IN FULL OF ALL CLAIMS


         This   Settlement   Agreement   and  Release  in  Full  of  All  Claims
("Agreement")  is made and entered into this 3rd day of April,  1998 by, between
and among Matrix  Pharmaceutical  Company, Inc.  (hereinafter  "Matrix"),  Chubb
Custom   Insurance   Company  and  Vigilant   Insurance   Company   (hereinafter
"Defendants")  (collectively  "the  Parties"),  with  reference to the following
facts, representations, warranties and promises:


                                   WITNESSETH


         WHEREAS,  Matrix brought suit against Defendants in the matter filed in
the  Alameda  County  Superior  Court-Hayward  Division,  case no.  H-192476  9,
entitled Matrix  Pharmaceutical,  Inc. v. Chubb Custom Insurance Company, et al.
(hereinafter "the Case"); and

         WHEREAS, Defendants appeared through their counsel of record; and

         WHEREAS,  the Case  arose from  Defendants'  denial of  coverage  under
insurance policies issued by Defendants to Matrix; and

         WHEREAS,  Defendants vigorously deny that they did anything wrong, have
any liability under any theory  whatsoever,  or so caused Matrix's damages,  and
that by entering  into this  agreement,  Defendants do not concede they have any
liability for any claims brought or which could have been brought by Matrix, and
specifically deny any liability whatsoever for Matrix's claims; and

         WHEREAS,  the  Parties  desire  to  avoid  the  expense,   burden,  and
uncertainty of continued litigation; and

         WHEREAS,  the Parties reached a compromise during a two-part  mediation
before  Justice Harry W. Low of JAMS Endispute in San Francisco on March 3, 1998
and April 3, 1998.

         NOW THEREFORE, it is hereby agreed among the Parties as follows:

         1. In consideration of (1) the total payment by Defendants to Matrix in
the amount of Four Million Dollars  ($4,000,000.00)  to occur on or before April
13, 1998 and (2)


<PAGE>


Matrix  Pharmaceutical,  Inc.  v.  Chubb  Custom  Ins.  Co.,  et al.  Settlement
Agreement


the return by  Defendants,  its lawyers and  consultants of all of the documents
(including  electronic  data and those  used as  exhibits)  Defendants  obtained
relating to the  underlying  lawsuit,  entitled  Collagen  Corporation v. Matrix
Pharmaceutical,  Inc., Santa Clara County Superior Court, case no. CV 746197, to
Matrix's counsel,  Brobeck, Phleger & Harrison, LLP, to occur on or before April
20, 1998. The receipt of and adequacy of the  consideration  described herein is
hereby  acknowledged as an accord and  satisfaction,  and Matrix agrees that its
claims,  in their entirety,  as asserted  against  Defendants,  may and shall be
dismissed with prejudice and without any further cost to either party.

         2. Matrix, its successors, assigns, representatives, agents, employees,
attorneys,  and any person or persons acting by, through or for it, hereby fully
releases, acquits and forever discharges Defendants, their successors,  assigns,
officers, directors,  representatives,  agents, employees,  attorneys, insurers,
and any  person or  persons  acting  by,  for or  through  them from any and all
liability,  actual or  potential,  for any and all  claims,  damages  or demands
whatsoever  in law or in equity  which  Matrix has,  might have  asserted,  have
claimed or now or in the future might claim arose from or in connection with the
Collagen Action.;

         3. With respect to the claims  released  herein,  Matrix and Defendants
each  expressly  waive  any  rights  or  benefits  available  to them  under the
provisions of California Civil Code Section 1542, which provides as follows:

            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
            the settlement with the debtor.

         4. It is understood and agreed that this is a full and final release of
any and all  claims  and  that the  parties  agree  that it  shall  apply to all
unknown,   unanticipated,   unsuspected,   and  undisclosed   claims,   demands,
liabilities, actions, or causes of action, as well as those which are now known,
anticipated, suspected or disclosed.

         5. This Agreement is made and entered into as a free and voluntary act,
and has been done only  after  Matrix  consulted  with its  attorneys,  Brobeck,
Phleger & Harrison, LLP,

                                       2

<PAGE>


Matrix  Pharmaceutical,  Inc.  v.  Chubb  Custom  Ins.  Co.,  et al.  Settlement
Agreement


and  Defendants  consulted  with their  attorneys,  Rudloff  Wood & Barrows  LLP
(and formerly Gordon & Rees).

         6. The Parties  agree that any and all actions  necessary  to secure an
immediate  dismissal  with  prejudice of  Plaintiff's  claims in this lawsuit as
against  Defendants shall be taken by the Parties and that each party shall bear
its own cost and  expense  incurred  in  connection  with  such  claims  and the
dismissal thereof.

         7. The  undersigned  representatives  have full authority to enter into
this Agreement.

         8.  In the  event  that  any  of the  terms,  conditions  or  covenants
contained in this Agreement are held to be invalid,  then such invalidity  shall
not effect the remaining terms,  conditions,  or covenants contained herein, all
of which shall remain in full force and effect.

         9. This Agreement may be executed in  counterparts,  all of which shall
be considered one and the same document.

         10. The  Stipulation  for  Settlement  CCP  Section  664.6  executed in
Justice  Low's  presence on April 3, 1998,  is attached  hereto as an exhibit to
this Agreement, however, to the extent that any of its terms conflict with those
stated herein. this Agreement shall control.

                                       3

<PAGE>


Matrix  Pharmaceutical,  Inc.  v.  Chubb  Custom  Ins.  Co.,  et al.  Settlement
Agreement


         11. This Agreement  contains the entire agreement  between the parties,
and the terms of this Release are contractual and not a mere recital.


         Dated this _____________ day of ____________, 1997.


/s/ J R Glynn
- ---------------------------------
MATRIX PHARMACEUTICAL, INC.

by J R Glynn,  its Chief Operating Officer.
   -----------      ------------------------
   print name                title


- ---------------------------------
CHUBB CUSTOM INSURANCE COMPANY

by           , its 
   -----------      ------------------------


- ---------------------------------
VIGILANT INSURANCE COMPANY

by           , its 
   -----------      ------------------------

                                       4


<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>                         0000882194
<NAME>                        Matrix Pharmaceutical, Inc.
<MULTIPLIER>                                   1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   MAR-31-1998
<CASH>                                          25,111
<SECURITIES>                                    40,345
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 1,872
<PP&E>                                          19,060
<DEPRECIATION>                                   4,392
<TOTAL-ASSETS>                                 103,542
<CURRENT-LIABILITIES>                            9,389
<BONDS>                                         16,007
                                0
                                          0
<COMMON>                                       225,214
<OTHER-SE>                                    (152,433)
<TOTAL-LIABILITY-AND-EQUITY>                   103,542
<SALES>                                              0
<TOTAL-REVENUES>                                     0
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                (4,023)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 596
<INCOME-PRETAX>                                 (4,023)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             (4,023)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    (4,023)
<EPS-PRIMARY>                                    (0.18)
<EPS-DILUTED>                                    (0.18)
        


</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission