LEASEHOLD IMPROVEMENTS AGREEMENT




                                 by and between



                             Village Builders, L.P.,
                        a California limited partnership


                                  ("Landlord")


                                       and


                         Fair, Isaac and Company, Inc.,
                             a Delaware corporation


                                   ("Tenant")


                          Dated as of November 26, 1997

                                                                  EXHIBIT 10.34


                        LEASEHOLD IMPROVEMENTS AGREEMENT


         THIS LEASEHOLD  IMPROVEMENTS  AGREEMENT (this  "Leasehold  Improvements
Agreement")  is made and entered into as of November  26,  1997,  by and between
Village  Builders,   L.P.,  a  California  limited  partnership  (herein  called
"Landlord"),  and Fair, Isaac and Company,  Inc., a Delaware corporation (herein
called "Tenant").


                                    RECITALS

         A. Landlord is the holder of an option to acquire those certain parcels
of real  property  commonly  known as 750 and 751  Lindaro  Street,  San Rafael,
California, more particularly described on Exhibit D hereto and described on the
tentative  site plan  attached  hereto as Exhibit G (the "PG&E  Property").  The
parties  acknowledge  that the legal  description  of the PG&E  Property  may be
revised in accordance  with the  provisions of the Option  Agreement (as defined
below).

         B. The City of San Rafael or its Redevelopment Agency (the "Agency") is
the owner of those  certain  parcels  of real  property  described  on Exhibit C
hereto  (the "City  Property").  The Agency has begun the process  necessary  to
dispose of the City Property, and it is Landlord's intention to obtain an option
to purchase the City Property from the Agency if possible.

         C. Landlord and Tenant are entering into a "Lease  Agreement (Phase I)"
of even date herewith (the "Lease"),  whereby Landlord will lease to Tenant, and
Tenant  will  lease from  Landlord,  upon and  subject to the terms,  covenants,
provisions  and  conditions  of the Lease,  certain real  property  described in
Exhibit  A hereto  and  certain  improvements  to be  constructed  on such  real
property in accordance with this Leasehold Improvements Agreement.

         D. Landlord and Tenant desire to enter into this Leasehold Improvements
Agreement for the purpose of establishing  the procedures  which they shall each
follow in the development and approval of plans and  specifications for the base
building  improvements  and the tenant  improvements  which are to be demised to
Tenant  pursuant to the Lease,  in the making and processing of  applications to
the  Agency  and  the  City  of San  Rafael  for the  approval  of the  proposed
construction of such base building improvements and the tenant improvements, and
for the actual  construction of such base building  improvements  and the tenant
improvements.


         NOW, THEREFORE,  for good and valuable  consideration,  the receipt and
sufficiency of which is hereby acknowledged,  Landlord and Tenant mutually agree
as follows:

         1.       DEFINITIONS.

                  Certain terms used in this  Leasehold  Improvements  Agreement
and the  Exhibits  hereto  shall have the  meaning set forth below for each such
term.  Certain  other terms shall have the meaning set forth  elsewhere  in this
Leasehold  Improvements  Agreement  and the Exhibits  hereto.  Unless  otherwise
defined in this  Leasehold  Improvements  Agreement or in the  Exhibits  hereto,
other terms shall have the meaning, if any, specifically ascribed to them in the
Lease.

                  1.1.  "Agreed Spread for Take-Out  Financing"  shall mean five
hundred  fifteen  (515) basis points,  unless Tenant  exercises the First Option
under  the  Option  Agreement,  in  which  event  "Agreed  Spread  for  Take-Out
Financing"  shall mean five  hundred  forty (540) basis  points.  The  foregoing
notwithstanding,  in the  event  that the  Construction  Financing  or  Take-Out
Financing or both selected by Landlord for the Project  requires that prevailing
wages be paid or that 

                                                                             -1-


union labor be used in  connection  with the  construction  of the  Project,  as
provided  in Section 0, the  "Agreed  Spread for  Take-Out  Financing"  shall be
reduced to five hundred five (505) basis  points,  unless  Tenant  exercises the
First  Option  under the Option  Agreement,  in which event  "Agreed  Spread for
Take-Out  Financing"  shall mean five  hundred  thirty (530) basis  points.  The
Agreed  Spread  for  Take-Out  Financing  shall  be  subject  to  adjustment  in
accordance with the provisions of Section 0.

                  1.2. "Agreed Take-Out  Financing Closing Costs" shall mean the
sum of Five Hundred Sixty-Five Thousand Dollars ($565,000.00).

                  1.3. "Aggregate  Development Cost" shall mean the aggregate of
all costs paid or to be paid, or reimbursed or to be reimbursed, by Landlord and
associated with the  development of the Project or improvements  upon or serving
the Phase II Land (but only to the extent that  improvements upon or serving the
Phase II Land  are  constructed  during  or  before  the  Construction  Period),
including without limitation: (i) a sum equal to the Net Stipulated Value of the
PG&E Property;  (ii) the actual cost to Landlord of arranging the acquisition of
the City Property;  (iii) all actual costs of the design and construction of the
Site  and  Shell  Improvements  and of all  improvements  to the  Phase II Land,
including without limitation parking areas,  landscaping,  walkways,  driveways;
(iv) the Tenant Improvement  Allowance;  (v) all fees and charges of architects,
engineers,  materials  testing  consultants  and other  design  or  construction
consultants;  (vi) any costs of  reproducing  plans;  (vii) any fees or costs of
providing  security to the Project or to the site of any  off-site  construction
during  the  Construction  Period;  (viii)  all  fees and  costs in  soliciting,
evaluating  and accepting  bids for any aspect of the work which  Landlord is to
cause to be performed pursuant to this Leasehold  Improvements  Agreement;  (ix)
all reasonable fees and costs (including, without limitation,  application fees,
commitment fees, appraisal fees, deposits, closing costs and loan fees) incurred
in connection with the Construction  Financing for the Project or any loan which
would have provided Construction Financing, even if such loan was not closed due
to the  expiration  for any reason of the lender's  commitment to make such loan
(provided,  however,  that if such  expiration  was solely  caused by Landlord's
failure to perform  obligations  under the commitment which were in the complete
control  of  Landlord,  then such fees and costs  with  respect  to the  expired
commitment  shall  not be  included  in  Aggregate  Development  Cost);  (x) all
reasonable fees and costs  (including,  without  limitation,  application  fees,
commitment  fees,  appraisal  fees and  deposits)  incurred in  connection  with
investigating or applying for and obtaining  Take-Out  Financing,  but only with
respect to a  particular  loan  which is not closed due to causes  which are not
completely  within the control of Landlord or if Tenant  requests  that Landlord
select the Designated  Treasury Rate in accordance with Section 19.2.A and, as a
result, Landlord must subsequently obtain by another loan commitment pursuant to
Section 19.2 (in which event break-up fees and other fees, costs, charges of the
kinds  and to the  extent  described  in  Section  1.3 of the  Option  Agreement
pertaining to Landlord's prior loan commitment shall also be a part of Aggregate
Development  Cost)  (except to the  extent  that such fees and costs are paid by
Tenant pursuant to Section 0); (xi) the Agreed Take-Out Financing Closing Costs;
(xii)  all  permit  fees and all fees  and  charges  for  services  rendered  by
employees of the City of San Rafael or consultants hired directly by the City of
San Rafael in connection with the application for, or issuance of, the necessary
demolition,  grading, building and similar permits required for the construction
of the Project; (xiii) all reasonable legal fees incurred in connection with the
Project, including,  without limitation,  legal fees incurred in connection with
the negotiation, documentation,  enforcement or interpretation of any agreement,
except:  (A) agreements  between  Landlord and Tenant,  (B)  agreements  between
Landlord and PG&E,  and (C) legal fees to obtain the  Development  Agreement (as
defined in the  Option  Agreement)  and the  entitlements  described  in section
8.2(j) of the Phase II Purchase Agreement, which legal fees are paid or incurred
on or  before  the date the  Development  Agreement  and such  entitlements  are
obtained  from all  applicable  governmental  agencies  (however,  the foregoing
clause (C) shall not exclude from Aggregate  Development  Costs reasonable legal
fees actually paid by Landlord to arrange the acquisition of the City Property);
(xiv) fees and costs of 

                                                                             -2-


audits or other reviews of financial  records  incurred in  connection  with any
review of  Aggregate  Development  Cost which  Tenant is permitted to conduct in
accordance  with the provisions of this Leasehold  Improvements  Agreement or in
connection  with the  requirements  of any lender of  Construction  Financing or
Take-Out Financing; (xv) premiums for, and other costs of, surety bonds or other
security required in connection with any aspect of the development of Phase I or
Phase II, to the extent that such  security  is provided by Landlord  and not by
Tenant;  (xvi) all costs reimbursed by Landlord to Tenant pursuant to Section 0;
(xvii) all fees and costs  incurred in connection  with  Hazardous  Materials or
environmental   mitigation  measures  undertaken  in  connection  with  Project,
including,  without limitation,  the obligations of Landlord with respect to the
"Operations and Maintenance of Groundwater Remedial System", as such obligations
are set forth in paragraph "6e.(1)" of the PG&E Environmental Agreement; (xviii)
all Real Estate Taxes payable, based upon a daily proration, with respect to the
Construction  Period (it being  agreed that all real estate  taxes  payable with
respect to such period shall be excluded from Real Estate Taxes, as that term is
defined in Section 0); (xix) all interest on Construction  Financing;  provided,
however, that interest on the amount by which the principal loan balance exceeds
an amount equal to  eighty-five  percent (85%) of all Phase I Project Cost shall
be  excluded  from  Phase I Project  Cost (for the  purpose of  determining  the
portion of interest  to be so  excluded,  if the  Construction  Financing  bears
interest at different  rates on different  tranches of the loan, the interest to
be so  excluded  shall be  determined  at the rate or  rates  applicable  to the
borrowing of the tranches which exceed eighty-five  percent (85%) of all Phase I
Project Cost, applying the rates on a tranche by tranche basis,  commencing with
the rate  applicable to the lowest  tranche,  provided  further,  however,  that
commencing on each Rent Commencement Date (as defined in the Lease),  the amount
of interest included in Aggregate Development Cost shall be reduced to an amount
equal to the  total  amount  of such  interest  multiplied  by a  fraction,  the
numerator of which is the Rentable  Area of the portions of the  Buildings  with
respect to which Tenant is not then paying rent, and the denominator of which is
the Rentable Area of all of the Buildings; (xx) all deposits (including, without
limitation,  deposits  in  connection  with  any  utility  service  or  Take-Out
Financing),  provided that the amount of any such deposits  returned to Landlord
shall be deducted from Aggregate Development Cost when received, but only to the
extent that such  deposits  were  previously  included in Aggregate  Development
Cost;  (xxi)  reasonable  fees and  expense  reimbursements,  if any,  paid to a
mortgage broker in connection with Construction Financing;  (xxii) in the event,
and during any period,  that the proceeds of Construction  Financing are, in the
aggregate,  less than eighty-five percent (85%) of all Phase I Project Cost then
incurred and paid,  then there shall be included in Phase I Project Cost imputed
interest at the rate of fifteen  percent  (15%) per annum on the amount by which
eighty-five  percent  (85%) of all Phase I  Project  Cost so  incurred  and paid
exceeds the then  advanced  proceeds  of the  Construction  Financing,  provided
further,  however, that commencing on each Rent Commencement Date (as defined in
the  Lease),   the  amount  of  such  imputed  interest  included  in  Aggregate
Development Cost shall be reduced to an amount equal to the total amount of such
imputed  interest  multiplied  by a  fraction,  the  numerator  of  which is the
Rentable Area of the portions of the  Buildings  with respect to which Tenant is
not then paying rent,  and the  denominator of which is the Rentable Area of all
of the Buildings;  (xxiii) all fees, costs and expenses  incurred by Landlord in
connection with the satisfaction of any condition or requirement  imposed by the
City of San  Rafael  or any other  governmental  agency  or  public  utility  in
connection  with any permit,  approval or agreement  (including the  development
agreement)  required  for the  development  of the Project,  including,  without
limitation,  any traffic or other impact fees,  traffic mitigation fees, utility
hook-up or service fee and improvements to, or adjacent to, Mahon Creek;  (xxiv)
all  amounts  expended  in  connection  with  site  work  and  on  and  off-site
improvements  required for the use or operation of the Project or required to be
constructed  or paid for as a  condition  to any permit,  approval or  agreement
(including the development  agreement)  necessary to the  construction or use of
the Base Building  Improvements  or Tenant  Improvements;  (xxv) all  reasonable
legal  fees and  reasonable  fees of other  technical  consultants  incurred  in
connection  with  the  negotiation  and   documentation  of  (A)  any  agreement
pertaining to the design and construction of the Project or any portion thereof,
or (B) any agreement  pertaining  to the design,  construction,  

                                                                             -3-


performance or security for any  improvement  or payment  imposed as a condition
upon any  approval by the City of San Rafael of any permit or approval  required
for the  development  of the Project,  but only to the extent the such agreement
would   typically  and  ordinarily  be  negotiated  and  documented   after  the
governmental  approval  of a  tentative  tract  map;  (xxvi)  all  premiums  for
insurance in force  following the  Commencement of  Construction,  excluding any
premiums  included in Expenses charged to Tenant pursuant to the Lease;  (xxvii)
title  insurance  premiums,  escrow fees and recording costs incurred during the
Construction  Period or incurred in connection with the  Construction  Financing
(but not Take-Out Financing),  except title insurance premiums,  escrow fees and
recording  costs in  connection  with the  acquisition  by  Landlord of the PG&E
Property;  (xxviii)  all costs paid to  contractors  or  materials  suppliers in
connection  with the  correction of Punch List,  Defect List or HVAC Defect List
items or other construction  defects, but only if Landlord has used commercially
reasonable  efforts to enforce its legal remedies  against the  contractors  and
suppliers which performed the original work to which the Punch List, Defect List
or HVAC Defect List items related to the extent such efforts were required to be
made by Landlord prior to any closing under the Option  Agreement;  and,  (xxix)
any other costs  which are  specifically  stated to be Phase I Project  Costs or
Phase II Current Costs elsewhere in this Leasehold Improvements Agreement.

                  _.Aggregate  Development Cost shall not include: (i) the price
paid by Landlord  for the  acquisition  of the PG&E  Property;  (ii)  Landlord's
ordinary  overhead;  (iii) the cost of preparing an environmental  impact report
for the Project, including, without limitation, the cost of preparing an initial
study and scoping the environmental impact report; (iv) fees and expenses of all
consultants  retained by Landlord for the purpose of  obtaining  approval by the
City  of San  Rafael  of any of the  permits  and  approvals  required  for  the
development of the Project (although fees and expenses of consultants whose work
pertains to the design or  engineering  of the Project or any part thereof or to
the obtaining of the necessary demolition, grading, building and similar permits
or to agreements or arrangements with utility providers,  shall be included as a
part of Aggregate  Development Cost, even if such work occurs in connection with
aspects of obtaining required permits and approvals from the City of San Rafael;
provided,  however,  that fees for appearances at meetings with officials of the
City of San  Rafael  pertaining  to  subjects  other than the  obtaining  of the
necessary demolition,  grading, building and similar permits or the obtaining of
agreements  or  arrangements  with  utility  providers  shall be  excluded  from
Aggregate  Development  Costs); (v) charges for the work or time of employees of
the City of San Rafael,  to the extent  pertaining to  environmental  review and
zoning  matters   (including,   but  not  limited  to,  the  preparation  of  an
environmental  impact report and the  negotiation  of a development  agreement),
other than as expressly  permitted  in Section 0; (vi) all expenses  incurred by
Landlord in connection with any election campaigns  pertaining to initiatives or
referenda pertaining to the Project;  (vii) all legal fees and fees and expenses
for public relations incurred directly in connection with obtaining the approval
by the City of San Rafael of the necessary  permits and  approvals  required for
the  development  of the  Project  other  than  necessary  demolition,  grading,
building    and   similar    permits    authorizing    the    commencement    of
construction-related  work (although fees and expenses of consultants whose work
pertains to the design or  engineering  of the Project or any part thereof shall
be included as a part of Aggregate Development Cost, even if such work occurs in
connection  with aspects of obtaining  required  permits and approvals  from the
City of San  Rafael);  (viii) all legal fees  incurred  in  connection  with the
negotiation or documentation  of the development  agreement with the City of San
Rafael,  the  acquisition  of the PG&E  Property,  and  agreements to the extent
pertaining to the environmental  condition of the PG&E Property;  (ix) all legal
fees incurred in connection with the resolution of disputes between Landlord and
Tenant under the Lease or this Leasehold Improvements Agreement;  (x) all costs,
if any,  incurred  in  connection  with the  relocation  of the  115KV  overhead
electrical  utility  line  from the  central  portion  of the  Phase I Land to a
location  further south,  to the extent that the cost of such relocation is paid
by Landlord;  (xi) costs  incurred by Landlord in connection  with the operation
and maintenance of the Phase I Land prior to the  Commencement of  Construction,
including Real Estate Taxes,  insurance  premiums,  and 

                                                                             -4-


other costs of ownership  not related to  obtaining  the approval by the City of
San  Rafael of any of the  necessary  permits  and  approvals  required  for the
development of the Project  (although all fees and expenses of consultants whose
work pertains to the design or planning of the Project or any part thereof shall
be included as a part of Aggregate Development Cost, even if such work occurs in
connection  with aspects of obtaining  required  permits and approvals  from the
City of San Rafael);  (xii) costs paid directly by Tenant in connection with any
Modifications;  (xiii) costs paid  directly by Tenant as a result of any Delays;
(xiv) any costs  paid by Tenant  directly  to a vendor or service  supplier  and
without  credit  against  Rent or  against  any  other  sum due from  Tenant  to
Landlord, even if such costs would otherwise have been a part of Phase I Project
Cost;  (xv)  salaries  and  other  compensation  paid to  Martin  Zemcik,  Glenn
Isaacson,  Conversion Management Associates,  Inc. or any other person or entity
providing  similar  general  development   consulting  services  or  third-party
development   management   services;   and  (xvi)  any  other  costs  which  are
specifically stated to be excluded from Aggregate  Development Cost elsewhere in
this Leasehold Improvements Agreement.

                  1.4. "Base Building  Improvements" shall mean the improvements
described in Section 0.

                  1.5.   "Budget"  shall  mean  that  budget  attached  to  this
Leasehold Improvements Agreement as Exhibit H hereto, as hereafter modified from
time to time in accordance  with this Leasehold  Improvements  Agreement,  based
upon  additional  information  or analyses  received or generated by Landlord or
Tenant. Landlord and Tenant acknowledge and agree that Estimated Phase I Project
Cost, as set forth in such budget,  represents a reasonable  estimate of Phase I
Project Cost,  based on the information  available to each of them, and is to be
used for the  convenience  of the parties in arranging  Take-Out  Financing  (as
provided in Section 0), but shall not be used or cited as a  limitation  for the
purpose  of  determining  actual  Aggregate  Development  Cost,  as that term is
defined in Section 0.

                  1.6.  "Commencement  of  Construction"  shall mean the time at
which Landlord  instructs its  contractor to commence,  pursuant to a grading or
building  permit  which has then been issued by the City of San Rafael,  grading
necessary to permit the construction of the improvements  which are to be a part
of Phase I.

                  1.7. "Common Area" shall mean all areas and facilities  within
the Project  located outside the Premises and intended for the use of tenants of
the Buildings,  including the landscaped  areas,  service areas,  parking areas,
recreation areas,  trash enclosures,  plazas,  walkways,  driveways,  sidewalks,
access and perimeter roads, and the like; but excluding from the Common Area the
Containment  Facilities  (as  those  are  defined  in the  Lease)  and any  area
contained within the boundaries of an exclusive easement granted to PG&E.

                  1.8. "Conceptual Plans for the Tenant Improvements" shall mean
and refer to the  conceptual  plans for the Tenant  Improvements  referred to in
Section 0.

                  1.9. "Construction  Financing" shall mean any loan arranged by
Landlord the proceeds of which loan are primarily  used or to be used for any or
all of the following  purposes:  (i) the acquisition of the PG&E Property;  (ii)
the  payment of any costs  incurred or to be  incurred  in  connection  with the
design or  construction  of the  Project  or other  improvements  in  connection
therewith;  or,  (iii)  the  reimbursement  to  Landlord  of funds  expended  or
reimbursed by Landlord in connection  with the  acquisition of the PG&E Property
or the design,  construction or development of the Project or other improvements
in connection  therewith.  In the event that Landlord does not elect to obtain a
loan  secured by a Mortgage  to provide  funds for such  purposes,  but  instead
obtains funds for those general  purposes from a source of capital which charges
interest or other fees for the use of such funds during the Construction Period,
then the  funds so  obtained  shall be  deemed  

                                                                             -5-


Construction Financing for the purposes of this Leasehold Improvements Agreement
during  the  period  prior to the Last Rent  Commencement  Date (but only to the
extent  that  such  funds do not  exceed  eighty-five  percent  (85%) of Phase I
Project  Cost) and shall be deemed to bear interest at the lowest rate for which
a conventional  construction loan to have been secured by a mortgage was offered
to Landlord in connection with the Project.

                  1.10.  "Construction  Period" shall mean the period commencing
with the  Commencement of Construction  and continuing to and including the Last
Rent Commencement Date.

                  1.11.  "Criteria for Take-Out Financing" shall mean all of the
following  terms (any of which may be waived by Landlord in the  exercise of its
sole discretion):  (i) the Take-Out Financing would provide actual proceeds (net
of fees,  closing  expenses and points) in an aggregate amount equal to not less
than  seventy-five  percent (75%) of the then current  Estimated Phase I Project
Cost;  (ii) the Take-Out  Financing  would require  payment of not more than one
hundred  (100) basis points as a loan fee at the closing of the loan;  (iii) the
Take-Out  Financing  would  require  payment  of a deposit  of not more than two
hundred  (200) basis points prior to the closing of the loan;  (iv) the Take-Out
Financing  would  be for a term,  including  possible  extensions,  of at  least
fifteen (15) years; (v) the Take-Out  Financing would be amortized over a period
of not more than thirty (30)  years;  (vi) no tranche of the loan would  require
any balloon  payment;  (vii) each  tranche  would be at a fixed rate of interest
over its term; (viii) the Take-Out Financing would impose no potential liability
on Landlord and its constituent partners,  nor require any guarantees;  (ix) the
lender would  consent to the parking for Phase I being  located upon the Parking
Easement  Area or such  other  area  within  Phase  II as to which  the  parking
easement  could be moved from the Parking  Easement Area pursuant to the Parking
Easement  Agreement;  (x) the Take-Out  Financing would not require any security
other than a Mortgage  encumbering  the Project,  a related  assignment of rents
from the  Project  and a security  interest  in the right of Tenant to park on a
portion of the Phase II Land; (xi) the Take-Out Financing would be from a lender
whose reputation and financial  position provide  reasonable  assurance that the
lender will perform all of its  obligations  under the loan in a timely  manner;
(xii) if the  lender  intends  to sell the loan or if the loan is subject to any
condition  requiring a third party  credit  review or rating,  such lender shall
have  stated  in  writing  that its chief  underwriter  has  consulted  with the
prospective  purchaser of the loan or the third party credit  reviewer or rating
agency  regarding  the  Hazardous  Materials  present  on the  Phase I Land  and
regarding the credit of Tenant;  (xiii) the Take-Out  Financing  would be from a
lender  other  than  Tenant or any entity  related  to Tenant or any  affiliate,
subsidiary,  parent entity or successor by merger to Tenant;  (xiv) the Take-Out
Financing would accept Tenant as a potential borrower under the loan; (xv) would
be consistent with the arrangements  concerning  subordination,  non-disturbance
and recognition set forth in the Lease, this Leasehold Improvements Agreement or
the Option  Agreement;  and, (xvi) the Take-Out  Financing would coordinate with
the  Construction  Financing  to be selected  by  Landlord,  including,  without
limitation,  the  execution  of any buy-sell  agreement  or tri-party  agreement
required by the lender of the Construction Financing.  Landlord, in the exercise
of its sole discretion, may, by written notice to Tenant, waive one or more such
criteria or agree that a particular  criterion can be modified in a manner which
is adverse to Landlord  without  being waived in its entirety.  Landlord  shall,
however,  consult  reasonably  with  Tenant as to, but shall not be  required to
accept, the modification of such criteria if no loan is found which meets all of
the criteria, except those which Landlord is prepared to waive.

                  1.12.  "Defect  List" shall mean a written list to be given by
Tenant to Landlord in accordance with the provisions of Section 0.

                  1.13.  "Delays" shall mean certain delays in the  construction
of the Site and  Shell  Improvements  or the  Tenant  Improvements  or both,  as
described in Section 0.

                                                                             -6-


                  1.14.  "Designated  Treasury  Rate"  shall mean the yield rate
determined in accordance with the provisions of Section 0.

                  1.15.  "Development  Constant"  shall mean the sum of: (i) the
Designated Treasury Rate; plus, (ii) the Agreed Spread for Take-Out Financing.

                  1.16.   "Descriptive  Base  Specifications"   shall  mean  the
descriptive  specifications attached to this Leasehold Improvements Agreement as
Exhibit E, as referred to in Section 0.

                  1.17.  "Draft  Working  Drawings for the Tenant  Improvements"
shall mean and refer to those  certain  draft  working  drawings  for the Tenant
Improvements referred to in Section 0.

                  1.18. "Estimated Phase I Project Cost" shall mean the estimate
of Phase I Project Cost set forth in the Budget.

                  1.19.  "Event  of  Default"  shall  mean an Event of  Landlord
Default or an Event of Tenant Default,  without inherent specificity as to which
of them.

                  1.20.   "Event  of   Landlord   Default"   shall   mean  those
circumstances so described in Section 0.

                  1.21. "Event of Tenant Default" shall mean those circumstances
so described in Section 0.

                  1.22.  "Final  Working  Drawings for the Tenant  Improvements"
shall mean and refer to those  certain  final  working  drawings  for the Tenant
Improvements referred to in Section 0. 

/// 
/// 
/// 
/// 
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                                                                             -7-


                  1.23. "Floor" shall mean any one of the interior floors of the
Buildings.

                  1.24.  "Floor  Substantial  Completion  Notice" shall mean and
refer to a notice from  Landlord to Tenant  that the Tenant  Improvements  for a
particular Floor within a Building are  Substantially  Complete,  as provided in
Section 0.

                  1.25.  "Force  Majeure  Events"  shall mean acts of God or the
elements, acts of the government, labor disturbances of any character, and other
similar   conditions,   beyond  the  reasonable   control  of  the  party  whose
performance, obligation or liability is excused or delayed by such event.

                  1.26.  "Gross Building Area" shall be determined in accordance
with the  "Standard  Method  for  Measuring  Floor  Area in  Office  Buildings",
approved as of June 7, 1996 by the American National Standards  Institute,  Inc.
(ANSI/BOMA Z65.1-1996).

                  1.27.  "Hazardous  Materials"  shall  mean  and  refer  to any
substance or material now or hereafter defined or regulated by any Environmental
Law as "hazardous substance," "hazardous waste," hazardous material," "extremely
hazardous  waste,"  "designated  waste,"  "restricted  hazardous  waste," "toxic
substance," or similar term. As used herein, the term "Hazardous Materials" also
means and includes any substance or material: (1) which is explosive, corrosive,
infectious, radioactive,  carcinogenic, mutagenic, or otherwise hazardous and is
regulated by any appropriate  governmental authority as a hazardous material; or
(2)  which  is or  contains  oil,  gasoline,  diesel  fuel  or  other  petroleum
hydrocarbons;  or (3) which is or contains polychlorinated biphenyls,  asbestos,
urea formaldehyde foam insulation,  radioactive materials; or (4) which is radon
gas.  The  term  "Hazardous  Substances"  may  include  without  limitation  raw
materials, building components, wastes, and the products of any manufacturing or
other activities on the Project.

                  1.28. "HVAC Defect List" shall mean a written list to be given
by Tenant to Landlord in accordance with the provisions of Section 0.

                  1.29. "Laws" shall mean all present and future laws, statutes,
ordinances, resolutions, regulations, codes, proclamations, orders or decrees of
any municipal,  county,  state or federal  government or other  governmental  or
regulatory  authority or special district with jurisdiction over the Project, or
any portion  thereof,  whether  currently in effect or adopted in the future and
whether or not in the contemplation of the parties hereto.

                  1.30.  "Modifications" shall mean and refer to certain changes
to the Final Working Drawings for the Tenant  Improvements which Tenant may make
in accordance with Section 0.

                  1.31.  "Mortgage"  shall mean any  mortgage,  deed of trust or
similar  security  instrument now or hereafter  encumbering  Phase I or any part
thereof (whether alone or together with other properties).

                  1.32.  "Necessary  Approvals"  shall  mean and  refer to those
certain  governmental permits and approvals necessary to permit the construction
of the Site and Shell Improvements and the Tenant  Improvements,  as referred to
in Section 0.

                  1.33.  "Necessary  Changes" shall mean and refer to changes to
the plans and  specifications for the Site and Shell Improvements and the Tenant
Improvements made for the purposes referred to in Section 0.

                  1.34. "Net  Stipulated  Value of the PG&E Property" shall mean
the sum of 

                                                                             -8-


Nine Million Three Hundred Fifty Thousand Dollars ($9,350,000.00).

                  1.35.  "Option  Agreement"  shall  mean that  certain  "Option
Agreement" between Landlord and Tenant of even date herewith.

                  1.36.  "Parking Easement" shall mean that certain easement for
vehicular parking to be granted in the Parking Easement Agreement.

                  1.37.  "Parking  Easement  Agreement"  shall mean that certain
"Parking Easement  Agreement" to be executed by Landlord and Tenant, as referred
to in the Phase II Purchase Agreement.

                  1.38.  "Parking  Easement Area" shall mean that portion of the
Phase II Land  located  within the  easement  granted  pursuant  to the  Parking
Easement Agreement.

                  1.39.  "PG&E"  shall mean and refer to Pacific  Gas & Electric
Company.

                  1.40. "PG&E  Environmental  Agreement" shall mean that certain
"Amended and Restated  Environmental  Agreement"  to be executed by Landlord and
PG&E.

                  1.41.  "PG&E  Property"  shall mean that certain real property
owned  by  Pacific  Gas &  Electric  Company  as of the  date of this  Leasehold
Improvements Agreement and more particularly described in Exhibit D. The parties
acknowledge  that the legal  description  of the PG&E Property may be revised in
accordance with the Option Agreement.

                  1.42. "Phase I" shall mean the Phase I Land, the Buildings and
the other  improvements  to be  constructed  by  Landlord on the Phase I Land in
accordance  with the  provisions  of the Lease and this  Leasehold  Improvements
Agreement,  together with the  landscaping  and paving  improvements  within the
Parking  Easement Area necessary to provide parking on the Phase II Land for the
use of Phase I. A tentative site plan for Phase I is attached  hereto as Exhibit
G.

                  1.43.  "Phase I  Buildings"  shall  mean the  Buildings  to be
constructed  by  Landlord  on  the  Phase  I Land  pursuant  to  this  Leasehold
Improvements Agreement. Subject to obtaining required permits and approvals from
the City of San Rafael and other governmental  agencies having jurisdiction over
the  Project,  it is the  intention of Landlord and Tenant that there be two (2)
office Buildings located on the Phase I Land, together containing  approximately
one hundred forty-nine thousand six hundred eighty-six  (149,686) square feet of
Rentable  Area,  with one such  Building  (known  as  "Building  A")  containing
approximately  eighty-one thousand six hundred seventy-one  (81,671) square feet
of Rentable Area and the other (known as "Building B") containing  approximately
sixty-eight thousand fifteen (68,015) square feet of Rentable Area.

                  1.44.  "Phase I Land" shall mean those certain parcels of real
property  described  in  Exhibit  A. The  parties  acknowledge  that  the  legal
description  of the Phase I Land may be  revised in  accordance  with the Option
Agreement.

                  1.45.  "Phase I Project Cost" shall mean the aggregate of: (i)
the difference  between the Aggregate  Development Cost and the Phase II Current
Costs  paid by  Tenant  pursuant  to  Section  0; and  (ii) a basic  development
management  fee in the  amount  of  Thirty-Two  Thousand  Five  Hundred  Dollars
($32,500.00)  per  month,  commencing  as of  the  month  of  January  1998  and
continuing for a period of twenty-three (23) additional months  thereafter.  Any
other provision of this Agreement notwithstanding,  in no event shall any amount
actually  paid by  Tenant  (whether  as a part of  Phase  II  Current  Costs  or
otherwise)  be  deemed a part of  Phase I  Project  Cost,  unless  Landlord  has
actually reimbursed such amount to Tenant.

                                                                             -9-



                  1.46.  "Phase  II" shall  mean the Phase II Land and the other
improvements  to be  constructed  by Landlord on the Phase II Land in accordance
with the  provisions of this  Leasehold  Improvements  Agreement  (including the
landscaping  and  paving  improvements  within the  Parking  Easement  Area).  A
tentative site plan for Phase II is attached hereto as Exhibit G.

                  1.47. "Phase II Current Costs" shall mean the aggregate of the
following costs, all of which are a portion of the Aggregate  Development  Cost:
(i) the purchase price for the Phase II Land paid by Tenant to Landlord pursuant
to the  Phase  II  Purchase  Agreement;  (ii) the  actual  cost to  Landlord  of
arranging  the  acquisition  of the City  Property;  (iii) all actual  costs and
expenses  of the design and  construction  of all  improvements  in the  Parking
Easement Area;  (iv) the cost of all fill materials  placed on the Phase II Land
by Landlord;  (v) the cost of all utilities  installed for the present or future
benefit of the Phase II Land or any  improvements  constructed  thereon or which
may be  constructed  thereon  in the  future;  (vi)  all  fees  and  charges  of
architects,  engineers,  materials  testing  consultants  and  other  design  or
construction consultants, to the extent that such fees and charges relate to the
design of buildings and other improvements to the Phase II Land; (vii) any other
component  of  Aggregate  Development  Cost,  to the extent that such  component
relates to the improvements to be installed on the Phase II Land,  whether at or
about  the same  time as the Site and  Shell  Improvements  or at a later  time,
allocating any costs which pertain both to Phase I and to Phase II in accordance
with the schedule of  allocations  set forth in Exhibit H; (viii) the  aggregate
cost of the design and  construction of the common area entrance and plaza areas
to the extent located on Phase II; (ix) all permit fees and all fees and charges
for  services  rendered by  employees  of the City of San Rafael or  consultants
hired directly by the City of San Rafael in connection with the application for,
or issuance of, the Necessary  Approvals  required for the  construction  of the
improvements  to be located upon the Phase II Land; (x) all costs  reimbursed by
Landlord to Tenant  pursuant to Section 0, to the extent that such costs pertain
to  improvements  to be located upon, or to serve,  the Phase II Land;  (xi) all
fees and costs incurred in connection  with  environmental  mitigation  measures
undertaken in connection with the Phase II Land; (xii) all deposits  (including,
without  limitation,  deposits  in  connection  with any  utility  service,  but
excluding  deposits in connection  with any Take-Out  Financing),  to the extent
that such  deposits  pertain to Phase II,  provided  that the amount of any such
deposits returned to Landlord shall be deducted from Aggregate  Development Cost
and Phase II Current  Costs  when  received,  but only to the  extent  that such
deposits were  previously  included in Aggregate  Development  Cost and Phase II
Current  Costs;  (xiii) all fees,  costs and  expenses  incurred  by Landlord in
connection with the satisfaction of any condition or requirement  imposed by the
City of San  Rafael  or any other  governmental  agency  or  public  utility  in
connection  with any permit,  approval or agreement  (including the  development
agreement)  required  for the  development  of the Project,  including,  without
limitation,  any traffic impact,  traffic  mitigation  fees,  utility hook-up or
service fee and  improvements to, or adjacent to, Mahon Creek, all to the extent
that such condition or requirement  was imposed in respect of improvements to be
constructed  upon the  Phase II Land,  whether  at or about the same time as the
Site and Shell  Improvements or at a later time;  (xiv) all amounts  expended in
connection with site work and on and off-site  improvements required for the use
or operation of improvements to be constructed  upon the Phase II Land,  whether
at or about the same time as the Site and Shell Improvements or at a later time,
or  required  to be  constructed  or paid for as a  condition  to any  permit or
approval  necessary  to  the  construction  or use of  such  improvements;  (xv)
premiums  for, and other costs of,  surety bonds or other  security  required in
connection  with  any  aspect  of  the  development  of  Phase  II  or  off-site
improvements  (allocating the cost of such bonds between Phase I and Phase II in
accordance with the schedule for such allocations set forth in Exhibit H, to the
extent that such  security is provided by Landlord and not by Tenant;  (xvi) all
reasonable  legal  fees  and  reasonable  fees of  other  technical  consultants
incurred in connection with the negotiation and  documentation  of any agreement
pertaining to the design and  construction of the improvements to be constructed
upon the Phase II Land or any portion thereof, whether at or about the same time
as the  Site  and  Shell  Improvements  or at a  later  time,  or any  agreement
pertaining  to the design,  

                                                                            -10-


construction  or security for any  improvement or payment imposed as a condition
upon any  approval  by the City of San  Rafael or any  utility  provider  of any
permit or agreement to provide utility services  required for the development of
such  improvements  (it  being  agreed  that  where  such fees are  incurred  in
connection  with an agreement  which pertains to both Phase I and Phase II, then
there shall be an  equitable  allocation  of such fees among the Phases based on
Rentable Area of the Buildings  approved for  construction on each of them, with
the share  allocated to Phase II constituting a part of Phase II Current Costs);
(xvii) all  premiums  for  insurance  in force  following  the  Commencement  of
Construction,  excluding  any  premiums  included in Expenses  charged to Tenant
pursuant to the Lease;  and,  (xviii)  any other  costs  which are  specifically
stated to be Phase II Current  Costs  elsewhere in this  Leasehold  Improvements
Agreement.  To the extent  that any  component  of  Aggregate  Development  Cost
pertains  both to the  Project  and to the Phase II Land or  improvements  to be
constructed  upon the  Phase II Land,  whether  at or about the same time as the
Site and Shell  Improvements  or at a later time,  the amount of such  component
shall be allocated  between  Phase I Project Cost and Phase II Current  Costs in
accordance with the provisions of Exhibit H.

                  1.48. "Phase II Land" shall mean those certain parcels of real
property  described  in  Exhibit  B. The  parties  acknowledge  that  the  legal
description  of the Phase II Land may be revised in  accordance  with the Option
Agreement.

                  1.49.  "Phase II Purchase  Agreement"  shall mean that certain
"Purchase  Agreement"  between  Village  Builders,  L.P.,  and  Fair,  Isaac and
Company, Inc. of even date herewith.

                  1.50. "Premises" shall mean the Buildings to be constructed by
Landlord on the Phase I Land as a part of the Project pursuant to this Leasehold
Improvements Agreement.

                  1.51.  "Project" shall mean the Phase I Land and the Buildings
and all other improvements to be constructed  thereon pursuant to this Leasehold
Improvements Agreement or which are hereafter constructed thereon by Landlord or
Tenant  in  accordance  with  the  provisions  of the  Lease  or this  Leasehold
Improvements Agreement.

                  1.52. "Project  Substantial  Completion Notice" shall mean and
refer to a notice from  Landlord  to Tenant  that the  Project is  Substantially
Complete, as provided in Section 0.

                  1.53.  "Punch  List" shall mean a written  list to be given by
Tenant to Landlord in accordance with the provisions of Section 0.

                  1.54.  "Real Estate  Taxes" shall have the meaning  given that
term in Section 5.10(A)(i) of the Lease.

                  1.55.  "Rentable  Area" shall be determined in accordance with
the "Standard Method for Measuring Floor Area in Office Buildings",  approved as
of June 7, 1996 by the American National Standards  Institute,  Inc.  (ANSI/BOMA
Z65.1-1996).

                  1.56.  "Review  Notice" shall mean a notice  pertaining to the
Phase I Project Cost which may be given by Tenant to Landlord in accordance with
Section 0.

                  1.57.  "Site  Improvements"  shall  mean  and  refer  to those
improvements  to be  constructed  on the Phase I Land and the Phase II Land,  as
described in Section 0.

                  1.58.  "Site and Shell  Improvements"  shall mean and refer to
the Site Improvements and the Base Building Improvements, taken together.

                                                                            -11-


                  1.59. "Substantial Completion" shall mean, with respect to the
entire portion of the Premises  located on a particular  Floor within one of the
Buildings,  (and such  portion of the  Premises  shall be deemed  "Substantially
Complete") when (i) installation of the Tenant  Improvements by Landlord on such
Floor has been  substantially  completed in  accordance  with the plans for such
Tenant  Improvements,  as certified by Tenant's architect  (provided that Tenant
shall use all  commercially  reasonable  efforts to cause Tenant's  architect to
cooperate  promptly  with  Landlord in  inspecting  the work and issuing  such a
certificate  immediately upon the occurrence of such  substantial  completion of
the Tenant  Improvements,  (ii) Tenant has direct  access from the street to the
lobby of such Building, (iii) sewer,  electricity,  water, gas (if required) and
standard telephone services are available to such Building,  (iv) at least three
(3) parking  spaces are  available  for the use of Tenant for each one  thousand
(1,000)  square feet of Gross  Building  Area located  upon such Floor,  (v) the
lobby of the Building in which the Floor is located is  Substantially  Complete,
(vi) any items  identified by Tenant in accordance with Section 0 as critical to
the use of  such  Floor  are  substantially  completed,  and  (vii)  appropriate
governmental  authorities have issued a temporary  certificate of occupancy with
respect to such Floor or have given an equivalent approval for occupancy of such
Floor.  "Substantial Completion" shall mean, with respect to the main lobby of a
Building,  (and such lobby shall be deemed  "Substantially  Complete")  when (i)
installation of the Tenant  Improvements by Landlord in such lobby has occurred,
(ii) Tenant has direct access from the street to such lobby,  (iii)  lighting is
available to such lobby,  (iv) at least one of the elevators  from such lobby to
the  Floors  above  are in  working  order,  and  (v)  appropriate  governmental
authorities  have made their final  inspections  of such lobby as  evidenced  by
signed final inspection  reports on file with said  authorities.  In all events,
Substantial  Completion  shall be  deemed  to have  occurred  notwithstanding  a
requirement to complete "Punch List" or similar  corrective work,  provided that
the lack of  completion  of such Punch List work would not  prevent  Tenant from
using the Premises for the Permitted Use without material interference.

                  1.60.  "Substantial Completion Notice" shall mean and refer to
a notice from Landlord to Tenant that the Site and Shell Improvements and Tenant
Improvements for Phase I are complete, as provided in Section 0.

                  1.61.  "Take-Out  Financing" shall mean any financing arranged
by Landlord,  the proceeds of which are primarily  used or to be used for either
or  both  of the  following  purposes:  (i) the  repayment  of any  Construction
Financing;  or,  (ii)  the  reimbursement  to  Landlord  of  funds  expended  or
reimbursed by Landlord in connection  with the  acquisition of the PG&E Property
or the City Property or the design,  construction  or development of the Project
or  improvements on the Phase II Land. In the event that Landlord does not elect
to obtain a loan secured by a Mortgage to provide funds for such  purposes,  but
instead obtains funds for those general  purposes from a source of capital which
charges  interest  or other  fees for the use of such  funds,  then the funds so
obtained shall be deemed  Take-Out  Financing for the purposes of this Leasehold
Improvements Agreement.

                  1.62.  "Tenant Caused Delays" shall mean certain delays in the
construction of the Site and Shell  Improvements  or the Tenant  Improvements or
both caused by Tenant, as described in Section 0.

                  1.63.  "Tenant  Improvements"  shall  mean and  refer to those
certain building interior  improvements  required by Tenant for its occupancy of
the Phase I Buildings and to be constructed on the Phase I Land, as described in
Section 0, but shall in all events exclude the Base Building Improvements.

                  1.64. "Tenant Improvement Allowance" shall mean a sum equal to
Twenty-Eight  Dollars  ($28.00)  per  square  foot of Net  Rentable  Area in the
Premises.

                                                                            -12-


                  1.65.  "Tentative  Site  Plan"  shall  mean and  refer to that
certain tentative site plan for the development of Phase I and Phase II attached
hereto as Exhibit G and referred to in Section 0.

                  1.66. "Work" shall mean the construction of the Site and Shell
Improvements  and the Tenant  Improvements  by Landlord in accordance  with this
Leasehold Improvements Agreement.

                  1.67.  "Working Drawings for the Site and Shell  Improvements"
shall mean and refer to those certain  final  working  drawings for the Site and
Shell Improvements referred to in Section 0.


                  2. GENERAL  DESCRIPTION OF THE IMPROVEMENTS TO BE DESIGNED AND
CONSTRUCTED BY LANDLORD.

                  2.1. General  Description of Site  Improvements.  Landlord and
Tenant intend that the Phase I Buildings shall contain approximately one hundred
sixty  thousand  (160,000)  square  feet of Gross  Building  Area,  and that the
Project  will  include  not less than  three  (3)  parking  spaces  for each one
thousand (1,000) square feet of Gross Building Area.  Landlord shall provide all
required  on-site  improvements  for the  Project  and all  base  hardscape  and
landscape features on the Phase I Land,  including  grading,  paving for parking
areas and drive aisles, sidewalks and street improvements,  utilities stubbed in
or to the shell of each Building,  landscaping,  monuments for Tenant's signage,
directional  signage,  exterior  lighting  in the  Common  Area and  other  site
improvements  which may be  required  by the City of San  Rafael or which may be
reasonably  necessary  to the use and  enjoyment of the  Buildings  for ordinary
office purposes.  Landlord shall also provide such off-site improvements outside
the boundaries of the PG&E Property as may be required by the City of San Rafael
or which may be  reasonably  necessary to the use and enjoyment of the Buildings
for ordinary office purposes.  Landlord shall also construct,  contemporaneously
with the  Project  and as a part of  Phase  II  Current  Costs:  (i) all  common
entrance  areas,  plazas,  parking,   associated  parking  access  walkways  and
landscaping within the parking areas, all to the extent such improvements are to
be located upon the Phase II Land for the purpose of providing parking or access
for the Project;  (ii) all  additional  landscaping  required by the City of San
Rafael to be installed on Phase II or reasonably  requested by Tenant;  (iii) to
the  extent  that  utilities  for the  planned  Phase II  buildings  would  most
conveniently and cost  effectively be provided by lines,  wires or pipes passing
through Phase I, then such lines,  wires and pipes, from the point of connection
to a  Phase  I  Building  nearest  to the  Phase  II Land  (or to the  point  of
connection  to the  lines,  wires  and  pipes  of the  utility  provider,  if no
connections to a Phase I Building lie along the lateral  lines,  wires and pipes
serving  Phase II) to points  which are  within  ten (10) feet of the  projected
locations of each the Phase II  buildings;  (iv) the pads and rough  grading for
the Phase II buildings,  to the extent not located  within the Parking  Easement
Area to serve Phase I; and, (v) conduits for  inter-building  telecommunications
among the Phase II buildings in their planned  locations,  stubbed to within ten
(10) feet of each such location.  The foregoing  improvements are referred to in
this  Leasehold  Improvements  Agreement  as the "Site  Improvements".  The Site
Improvements  shall be constructed  by Landlord in accordance  with the "Working
Drawings for the Site and Shell Improvements", as referred to in Section 0 below
and as developed in accordance with this Leasehold Improvements Agreement.

                  2.2.  General  Description  of  Base  Building   Improvements.
Landlord shall also construct each of the Phase I Building shells (collectively,
the "Base Building Improvements"), which shall include the following:

                        A.  The structural  elements and  weathertight  exterior
                            walls (including

                                                                            -13-


                            glazing),  exterior  doors  and  roof of the Phase I
                            Buildings;

                        B.  The main  ground  floor  lobby  area of each Phase I
                            Building;

                        C.  Smooth   concrete   floors,   based  on  reasonable,
                            good-quality   commercial   construction   standards
                            (ready for carpet or resilient tile);

                        D.  Ceilings in toilet rooms and in other rooms  located
                            within  the  cores  of the  Buildings  (not in other
                            areas), but only to the extent that ceilings in such
                            other rooms are required by applicable codes;

                        E.  The core area on each  Floor,  including  elevators,
                            toilet  rooms,  electrical  closets  (one (1) in the
                            smaller   Building  and  two  (2)  in  the  larger),
                            telecommunications    closets,   mechanical   rooms,
                            janitorial  closets,  exit  stairs,  hold  open door
                            assemblies  at  lobby  perimeter  doors,  mechanical
                            shafts, HVAC (as defined and required by Section 0),
                            electrical  power systems (as required by Section 0)
                            life safety  systems (as  required by Section 0) and
                            sprinkler systems (as required by Section 0);

                        F.  Dry wall, paint ready  (finish-taped and sanded, but
                            not painted) around surfaces of walls in core areas,
                            on interior portions of exterior walls below ceiling
                            level (and fire-taped  drywall on interior  portions
                            of exterior  walls above ceiling level to the extent
                            required by applicable  Laws),  and around  interior
                            columns;

                        G.  An  operating  primary  system to  provide  heating,
                            ventilating and air conditioning service ("HVAC") to
                            the  toilet  rooms and  electrical  closets  of each
                            Floor and to the edge of each Phase I Building  core
                            at each Floor,  not including  main loops and branch
                            distribution,  on-Floor  controls,  mixing boxes and
                            fire dampers, except to the extent that fire dampers
                            are required in core areas by applicable Laws for an
                            undivided occupancy;

                        H.  Primary electrical distribution system to each Phase
                            I Building core, including one (1) 480 volt panel on
                            each Floor, step down transformers, one (1) 120 volt
                            convenience panel on each Floor and one (1) lighting
                            panel on each Floor;

                        I.  Exits to the extent required by code;

                        J.  Metal window assembly  details  necessary to achieve
                            closure to interior drywall (or, where required,  to
                            the acoustic  ceiling) at the window head,  sill and
                            jamb;

                        K.  One  standard  telecommunications  point of presence
                            location (with standard  telephone line connections)
                            at each Building, and,

                        L.  Life  safety  systems  as  required  by  code  for a
                            building in shell  condition,  including  sprinklers
                            with heads  necessary to meet  current  requirements
                            for space in such shell condition.

The Base Building  Improvements  shall be  constructed by Landlord in accordance
with the Working 

                                                                            -14-


Drawings for the Site and Shell  Improvements,  as developed in accordance  with
this Leasehold Improvements Agreement.  Notwithstanding the foregoing, any items
specifically  identified or designated in this Leasehold  Improvements Agreement
or in the Exhibits hereto as Tenant  Improvements shall not be included in or be
a part of the Site and Shell Improvements.

                  2.3. General Description of Tenant  Improvements.  In addition
to the Site and Shell  Improvements,  for each Phase I Building  Landlord  shall
furnish all building interior  improvements required by Tenant for its occupancy
of the Phase I Buildings and security fencing and enclosures (collectively,  the
"Tenant  Improvements").  The Tenant  Improvements  shall exclude all telephone,
telecommunications  and  security  equipment  and cabling,  uninterrupted  power
supplies  and  fire  suppression  systems  for  electronic  equipment  (although
Landlord shall construct all ordinary building-wide  sprinkler systems as a part
of the Tenant  Improvements),  unless  Landlord  and Tenant  hereafter  agree in
writing  that  such  work  or some  part  of it  will  be a part  of the  Tenant
Improvements.  The Tenant  Improvements  shall be  constructed  by  Landlord  in
accordance  with the "Final Working  Drawings for the Tenant  Improvements",  as
referred  to in  Section  0 below  and as  developed  in  accordance  with  this
Leasehold Improvements Agreement.

                  2.4.  Design  of  Site  and  Shell  Improvements.   Except  as
otherwise  provided in Sections 0, 0 and 0,  Landlord  shall design the Site and
Shell  Improvements in accordance with: (i) the Descriptive Base  Specifications
attached  hereto as Exhibit E; (ii) the basic  conceptual  design  drawings (the
"Preliminary  Drawings")  listed on Exhibit F attached  hereto;  and,  (iii) the
tentative site plan (the "Tentative Site Plan") attached hereto as Exhibit G.


         3.       PREPARATION  AND  APPROVAL  OF APPLICATIONS TO THE CITY OF SAN
RAFAEL.

                  3.1. Applications. Certain permits and approvals from the City
of San Rafael  and other  governmental  agencies  having  jurisdiction  over the
Project  or the Phase I Land or Phase II Land  will be  required  to permit  the
development  and  construction  of the  Project and the work to be paid for as a
Phase II Current Cost (the "Necessary Approvals"). Landlord, in cooperation with
Tenant,  has prepared and submitted to the City of San Rafael an application for
certain of the Necessary Approvals,  including without limitation,  applications
for: (i) development plan approval;  (ii) vesting tentative map approval;  (iii)
approval of a  development  agreement;  and (iv) such  environmental  and design
review approvals as may be required.

                  3.2. Changes in Plans and Specifications.  Landlord and Tenant
acknowledge  that changes in the design,  configuration,  materials and building
systems (collectively,  "Necessary Changes") may: (i) be necessary to obtain one
or more of the  governmental  approvals  required to permit the construction and
occupancy of the Phase I Buildings or any part of Phase II; (ii) be necessary as
a result  of  conditions  imposed  upon one or more  such  approvals  or, in the
judgment of Landlord,  may be necessary to expedite the  obtaining of any one or
more  such  Necessary  Approvals;  (iii) be  required  to  comply  with any site
constraints  imposed  by PG&E;  or,  (iv) be deemed  necessary  by  Landlord  to
decrease  the  Estimated  Phase I Project  Cost if and to the extent  that it is
greater than One Hundred Eighty-Three Dollars ($183.00) per square foot of Gross
Building Area. In the event that a Necessary Change involves the reconfiguration
of a Phase I Building or a change to the  ornamentation  or other  decorative or
design   characteristics  of  the  Building,   Landlord  shall,  to  the  extent
commercially reasonable in the circumstances:  (i) make such Necessary Change in
a manner  which,  in the  reasonable  opinion of Landlord,  does not  materially
interfere with Tenant's intended uses of the Premises, except to the extent that
such changes are necessary to comply with any governmentally imposed restriction
or  requirement;  (ii) make such  Necessary  Change in a manner  which would not
cause  the  Gross  Building  Area in the  Phase  I  Buildings  to be  less  than
approximately  one hundred forty  thousand  (140,000)  square feet;  

                                                                            -15-


and, (iii) consult  reasonably  with Tenant before  agreeing or deciding to make
such  changes,  although the  decision of Landlord as to such  changes  shall be
final and  binding on the  parties.  Landlord  shall  deliver to Tenant  written
notice of each  Necessary  Change,  which  notice shall  describe the  Necessary
Change in  reasonable  detail and shall state the  objectives  of such  proposed
change.  In the  event  that  Tenant  desires  to have  another  change  made to
accomplish the objectives of the Necessary  Change proposed by Landlord,  Tenant
shall describe such  alternative  change in writing to Landlord  within ten (10)
days of the receipt by Tenant of a written  notice  from  Landlord of a proposed
Necessary  Change,  which  alternative  change shall be sufficient to obtain the
objectives  of the  Necessary  Change  proposed by  Landlord.  In the event that
Tenant proposes an alternative  change which  accomplishes the objectives of the
Necessary Change proposed by Landlord, but Landlord does not wish to accept such
alternative  change  in lieu  of the  Necessary  Change  proposed  by  Landlord,
Landlord or Tenant may cause such matter to be submitted to arbitration pursuant
to the  provisions  of Section 0. In the event that any of the Phase I Buildings
are  reconfigured,  the  description  of the  Premises  for the purposes of this
Leasehold  Improvements  Agreement  shall be modified in a reasonable  manner by
written  notice from  Landlord to Tenant to reflect the  reconfiguration  of the
Phase I  Building(s).  In the event that  Landlord  determines  that a Necessary
Change is to be made,  Landlord  may amend the  applications  to the City of San
Rafael to reflect appropriately such Necessary Change.

                  3.3.  Consistency with Descriptive  Base  Specifications.  The
provisions of Section 0 to the contrary  notwithstanding,  in no event shall any
Necessary  Change cause the Base Building  Improvements to be inconsistent  with
the Descriptive Base Specifications,  except to the extent:_. (i) such Necessary
Change  is  required  as a result  of any  governmentally  mandated  requirement
applicable to the Project; (ii) such Necessary Change is required as a result of
any  requirement  imposed  by a lender or  prospective  lender  of  Construction
Financing or Take-Out Financing;  or, (iii) Landlord reasonably  determines that
equipment  or  materials   necessary   to  conform  to  the   Descriptive   Base
Specifications  cannot be obtained  within the time periods  necessary to permit
Landlord  to  perform  in a  timely  manner  its  obligations  pursuant  to this
Leasehold Improvements Agreement or the Lease. In any such event, Landlord shall
use commercially reasonable efforts in the circumstances to substitute equipment
or materials  capable of  substantially  equivalent  performance to any building
equipment or materials specified in the Descriptive Base Specifications.

                  3.4.  Fees  and  Expenses  Incurred  in  Connection  with  the
Applications.  Subject to the  provisions of Section 0,  Landlord  shall pay all
fees and costs incurred in connection with the preparation,  filing,  amendment,
processing  and  approval of the  applications  referred to in Section 0 (except
that Tenant shall bear any cost incurred by it in connection  with its review of
the  applications  and the  cost of any  attorney  or  consultant  who  makes an
appearance on behalf of Tenant at any  governmental  hearings or meetings  where
such  consultant  or  attorney  is there at the request of Tenant and not at the
request of Landlord),  including the cost of any environmental  impact report or
other documents or studies  required to satisfy the  requirements of the City of
San Rafael.  Subject to the provisions of Section 0, Landlord shall also pay the
entire cost of satisfying  any  conditions  imposed by the City of San Rafael on
the  approval  of such  applications,  all of which cost shall be a part of both
Aggregate  Development  Cost and either Phase I Project Cost or Phase II Current
Costs, as appropriate.

                  3.5. Letter Agreements Pertaining to Certain Fees and Expenses
Incurred in Connection with the  Applications.  Landlord and Tenant have entered
into three letter agreements, one executed by both of them on August 28, 1996, a
second executed by Landlord on April 18, 1997 and by Tenant on May 16, 1997, and
a third  executed by Tenant on September 17, 1997, all three of which pertain to
the payment of certain  expenses  incurred or to be incurred in connection  with
the design and planning for the Project and other  improvements  on the Phase II
Land. Notwithstanding the provisions of such September 17, 1997 letter regarding
limitation upon 

                                                                            -16-


amount and  termination of the  obligations  thereunder,  it is the intention of
Landlord  and Tenant that  Tenant  shall  continue  to pay all such  expenses as
described in such letter agreement  through January 12, 1998, and thereafter all
such  letter  agreements  shall be  superseded  by this  Leasehold  Improvements
Agreement,  but only to the extent that such letter agreements  pertain to costs
incurred  after  January  12,  1998.  In the event  that  Tenant  elects to have
Landlord  reimburse  Tenant,  in  accordance  with the  provisions of the letter
agreements, for certain of the costs incurred and paid by Tenant pursuant to the
letter  agreements,  such costs shall be reimbursed by Landlord to Tenant within
thirty (30) days of the Commencement of Construction, without interest, and such
costs shall be Phase I Project Cost to the full extent so reimbursed by Landlord
to Tenant.


         4. COOPERATION IN PLANNING PROCESS. Tenant and Landlord shall cooperate
reasonably  with one  another  in a good  faith  effort to obtain  all  permits,
approvals  and  entitlements  necessary  to develop the Project  pursuant to the
applications previously filed with the City of San Rafael.


         5. PREPARATION OF PLANS AND SPECIFICATIONS  FOR OFF-SITE  IMPROVEMENTS.
As promptly as is reasonable in the circumstances following both the issuance by
the  City  of  San  Rafael  of all  permits  and  approvals  necessary  for  the
construction  of the Project  (excluding  building and grading  permits) and the
time at which the extent of all off-site  improvements which are required by the
City of San Rafael in connection with the Site  Improvements can be ascertained,
Landlord  shall  cause  plans  and   specifications  to  be  prepared  for  such
improvements. Such plans and specifications shall not be subject to the approval
of Tenant, but shall be submitted to Tenant for its information.


         6. PREPARATION OF WORKING DRAWINGS FOR THE SITE AND SHELL IMPROVEMENTS.

                  6.1. Initial  Preparation.  Promptly following the issuance by
the  City  of  San  Rafael  of all  permits  and  approvals  necessary  for  the
construction of the Site and Shell Improvements  (excluding building and grading
permits),  or at such earlier time as Landlord may elect in its sole discretion,
Landlord shall,  at its expense,  cause its architects and engineers to commence
preparation  of  working  drawings  for the Site  and  Shell  Improvements  (the
"Working  Drawings  for the  Site  and  Shell  Improvements"),  which  shall  be
consistent with the Descriptive  Base  Specifications  and generally  consistent
with the  Preliminary  Drawings and  Tentative  Site Plan,  except for Necessary
Changes.  Landlord and Tenant  acknowledge  that Landlord may, in its reasonable
discretion,  incorporate features in the Base Building  Improvements to make the
Building   more  readily   adaptable   for   multi-tenant   use.  The  foregoing
notwithstanding,  the Working  Drawings for the Site and Shell  Improvements may
deviate  from  the  Preliminary  Drawings  and  Tentative  Site  Plan  (but  not
Descriptive Base  Specifications) if required as a result of: (i) engineering or
environmental considerations necessary to the structural integrity of a Building
or  other  improvements  which  first  become  apparent  in  the  course  of the
preparation  of the Working  Drawings for the Site and Shell  Improvements;  or,
(ii) if reasonably  deemed necessary by Landlord to decrease the Estimated Phase
I  Project  Cost  if and to the  extent  that it is  greater  than  One  Hundred
Eighty-Three Dollars ($183.00) per square foot of Gross Building Area.

                  6.2.  Submission to Tenant for Review.  Landlord  shall submit
the  Working  Drawings  for the Site and Shell  Improvements  to Tenant  for its
review, and may make such submissions in increments the review of which does not
require  other  portions  of  the  Working  Drawings  for  the  Site  and  Shell
Improvements  which  Landlord  has not then  submitted  to Tenant.  Tenant shall
notify  Landlord  within  ten (10) days from the  receipt  by Tenant of any such

                                                                            -17-


submission whether or not Tenant agrees that the portion of the Working Drawings
for the Site and Shell  Improvements  included in such  submission is consistent
with the  Descriptive  Base  Specifications.  In the event that Tenant  fails to
respond to such  submission  within such period of ten (10) days,  Landlord  may
give to Tenant a second notice stating such failure and further  stating that if
Tenant  does not  respond  within five (5) days of the receipt by Tenant of such
second  notice  from  Landlord,  Tenant  will be deemed to have  agreed that the
portion of the  Working  Drawings  for the Site and Shell  Improvements  in such
submission is consistent with the Descriptive Base Specifications.  In the event
that Tenant fails to respond to such  submission  within such period of five (5)
days of the receipt by Tenant of such second notice from Landlord,  Tenant shall
for all  purposes  be deemed to have agreed that the portion of such the Working
Drawings  for the Site and Shell  Improvements  included in such  submission  is
consistent with the Descriptive Base  Specifications.  In the event of a dispute
between  Landlord  and Tenant with regard to the  question of whether or not the
Working  Drawings for the Site and Shell  Improvements  are consistent  with the
Descriptive Base  Specifications or as to any variances required to decrease the
Estimated  Phase I Project Cost if and to the extent that it is greater than One
Hundred  Eighty-Three  Dollars ($183.00) per square foot of Gross Building Area,
either  Landlord or Tenant may require by written  notice to the other that such
dispute be resolved by arbitration  conducted in accordance  with the provisions
of Section 0.

                  6.3.  Tenant's  Review  Responsibilities.  Landlord agrees and
understands  that the  review  of the  Working  Drawings  for the Site and Shell
Improvements by Tenant is solely to protect the interests of Tenant,  and Tenant
shall not be the guarantor of, nor in any way or to any extent  responsible for,
the correctness or accuracy of any such Working  Drawings for the Site and Shell
Improvements  or of the  compliance  of such  Working  Drawings for the Site and
Shell  Improvements  with  applicable  Laws.  Approval  by Tenant of the Working
Drawings  for the Site and Shell  Improvements  prepared by  Landlord  shall not
imply approval by Tenant as to compliance of such Working  Drawings for the Site
and Shell Improvements with applicable Laws.

                  6.4. Submission to the City of San Rafael. Upon the completion
of the Working  Drawings  for the Site and Shell  Improvements  (or such part or
parts  thereof as the City of San Rafael may be willing to accept as  sufficient
to constitute an application for a building permit),  Landlord shall submit such
working drawings to the City of San Rafael together with all other documents and
fees necessary to constitute an  application  for a building  permit.  If only a
portion  of the  Working  Drawings  for the Site  and  Shell  Improvements  were
submitted  to the  City  of San  Rafael  at the  time of the  application  for a
building permit,  Landlord shall cause its architects and its engineers promptly
to complete any additional  necessary parts of the Working Drawings for the Site
and Shell  Improvements  and shall  submit them to the City of San Rafael and to
Tenant.

                                                                            -18-


         7.       TENANT'S ARCHITECT AND ENGINEERS.

                  7.1. Submission of List of Consultants. Within sixty (60) days
of the date of this  Leasehold  Improvements  Agreement,  Tenant shall submit to
Landlord for its approval,  which shall not be unreasonably withheld or delayed,
a list of architects,  engineers and other  consultants to be used in connection
with the  design of the  Tenant  Improvements.  Landlord  shall  respond to such
request for approval from Tenant within fifteen (15) days of the receipt of such
list by Landlord.  In the event that  Landlord  fails to respond to such request
within  such period of fifteen  (15) days,  Tenant may give to Landlord a second
notice  stating  such  failure and  further  stating  that if Landlord  does not
respond within five (5) days of the receipt by Tenant of such second notice from
Landlord,  Tenant  will be  deemed  to have  approved  the  list of  architects,
engineers and other consultants  submitted by Tenant. In the event that Landlord
fails to  respond to such  request  within  such  period of five (5) days of the
receipt by Landlord of such second  notice from Tenant,  Landlord  shall for all
purposes be deemed to have  approved the list  architects,  engineers  and other
consultants submitted by Tenant.  Tenant shall select architects,  engineers and
other  consultants  for the design of the Tenant  Improvements  from among those
approved by Landlord in response to such request from Tenant.

                  7.2. Cost of Preparation.  The cost of preparing all plans and
specifications  for the Tenant  Improvements  (including  without limitation the
Conceptual  Plans for the Tenant  Improvements  referred to in Section 0 and the
Draft Working Drawings for the Tenant Improvements  referred to in Section 0 and
the Final Working  Drawings for the Tenant  Improvements  referred to in Section
0), and the cost of preparing any change thereto shall be paid by Tenant.


         8.       SUBMITTAL OF CONCEPTUAL PLANS FOR THE TENANT IMPROVEMENTS.

                  8.1. Preliminary  Submission.  Tenant has previously submitted
to Landlord, and Landlord acknowledges receipt of, a preliminary conceptual plan
for the Tenant  Improvements  which indicates all of Tenant's  requirements  for
meeting rooms, kitchen facilities, office locations, corridor locations, general
arrangement  of uses on  particular  Floors and any other  special  requirements
which  would  reasonably  be expected to affect any aspect of the Site and Shell
Improvements.

                  8.2. First  Submission.  On or before January 1, 1998,  Tenant
shall submit to Landlord  conceptual  plans for the Tenant  Improvements  in the
Phase I Buildings  ("Conceptual Plans for the Tenant  Improvements"),  including
architectural,  mechanical and electrical,  telecommunications and security, and
reflected  ceiling  drawings.  The Conceptual Plans for the Tenant  Improvements
shall be consistent  with the  preliminary  plan submitted by Tenant pursuant to
Section 0 and shall provide for corridors,  lobbies,  bathrooms,  mechanical and
electrical  systems,  and fire exits which are designed to accommodate single or
multi-tenant  configurations of each Floor in each Building (including,  without
limitation,  separate  metering for utilities),  in conformance with the Working
Drawings for the Site and Shell  Improvements  (to the extent that  Landlord has
previously delivered the same to Tenant), and in a design reasonably  acceptable
to Landlord. At the time that Tenant submits such plans to Landlord,  Tenant may
identify particular elements of the Base Building  Improvements or of the Tenant
Improvements  or both  which are  critical  to the use by  Tenant of  particular
Floors and which must  therefore be  Substantially  Completed  before Tenant can
accept as  Substantially  Complete those particular  Floors,  which Floors shall
also then be identified by Tenant.

                  8.3. Purpose of Conceptual Plans for the Tenant  Improvements.
Such  

                                                                            -19-


Conceptual  Plans for the  Tenant  Improvements  shall be for the  general
information  of Landlord,  and to assist in the  coordination  of the design and
construction of the Tenant  Improvements,  but receipt of such Conceptual  Plans
for the Tenant  Improvements  by Landlord  shall not  constitute  an approval by
Landlord of the design or specifications  shown thereon.  Landlord shall, within
fifteen  (15) days  following  receipt by  Landlord  of such plans from  Tenant,
review,  comment on and return the Conceptual Plans for the Tenant  Improvements
to Tenant,  marked  "Approved",  "Approved as Noted" or  "Disapproved  as Noted,
Revise and Resubmit." If the Conceptual  Plans for the Tenant  Improvements  are
returned to Tenant marked  "Disapproved as Noted,  Revise and Resubmit,"  Tenant
shall  cause such plans to be  revised  within  twenty  (20) days,  taking  into
account the reasons for Landlord's disapproval, and shall resubmit revised plans
to Landlord for review.  The same  procedure  shall be repeated  until  Landlord
fully approves the Conceptual Plans for the Tenant Improvements.  Landlord shall
only refuse to consent to such Conceptual  Plans for the Tenant  Improvements on
the  grounds  that they are  inconsistent  with the plans for the Base  Building
Improvements or with the requirements of any applicable Laws.


         9. PREPARATION OF WORKING DRAWINGS FOR THE TENANT  IMPROVEMENTS.  On or
before February 15, 1998, Landlord shall deliver to Tenant those portions of the
Working  Drawings  for the Site and  Shell  Improvements  which  are  reasonably
required  to  permit  Tenant  to  prepare   working   drawings  for  the  Tenant
Improvements.  Within ninety (90) days after Tenant's  receipt  thereof,  Tenant
shall deliver to Landlord one (1) set of  reproducible  sepia and three (3) sets
of  blue-lined  prints  of  working  drawings  and  specifications  (hereinafter
referred  to  collectively  as  the  "Draft  Working  Drawings  for  the  Tenant
Improvements") for such Tenant Improvements  prepared, at Tenant's sole cost and
expense,  by an  architect  ("Tenant's  Architect")  licensed  in the  State  of
California  and selected by Tenant and approved by Landlord in  accordance  with
Section 0 above or  otherwise  specifically  approved  in writing  by  Landlord.
Landlord  shall  cooperate   reasonably  with  Tenant  in  connection  with  the
preparation of the Working Drawings for the Tenant  Improvements,  provided that
the production of such drawings shall be the sole  responsibility  of Tenant and
further provided that such cooperation  shall not limit the right of Landlord to
review and approve such Working  Drawings,  as herein  provided.  Landlord shall
only refuse to consent to such  Working  Drawings  on the grounds  that they are
inconsistent  with the  plans  for the Base  Building  Improvements  or with the
requirements  of any applicable  Laws.  Within fifteen (15) business days of the
receipt by Landlord of the Draft  Working  Drawings for the Tenant  Improvements
from  Tenant,  Landlord  shall  return to Tenant  one (1) sepia set of the Draft
Working Drawings for the Tenant  Improvements  marked  "Approved",  "Approved as
Noted" or  "Disapproved  as Noted,  Revise and  Resubmit."  If the Draft Working
Drawings for the Tenant  Improvements are returned to Tenant marked "Disapproved
as Noted,  Revise and Resubmit,"  Tenant shall cause such Draft Working Drawings
for the Tenant  Improvements to be revised,  taking into account the reasons for
Landlord's  disapproval and shall resubmit revised plans to Landlord for review.
The same  procedure  shall be repeated  until  Landlord fully approves the Final
Working  Drawings for the Tenant  Improvements.  It is understood that the Draft
Working Drawings for the Tenant  Improvements and the Final Working Drawings for
the Tenant  Improvements are to be consistent with, and a logical  extension of,
the  Conceptual  Plans for the  Tenant  Improvements  approved  by  Landlord  in
accordance  with  Section 0 above.  Tenant shall be solely  responsible  for the
completeness of the Draft Working  Drawings for the Tenant  Improvements and the
Final Working  Drawings for the Tenant  Improvements  and for  conformity of the
Final Working Drawings for the Tenant Improvements with the Working Drawings for
the Site and Shell Improvements  provided by Landlord to Tenant.  When the Final
Working  Drawings  for the Tenant  Improvements  are  approved by  Landlord  and
Tenant:  (i) they shall be  acknowledged  as such by Landlord and Tenant signing
each sheet of the Final Working Drawings for the Tenant Improvements;  and, (ii)
no changes shall be made to the approved  Final Working  Drawings for the Tenant
Improvements without the prior written consent of Landlord, which consent may be
withheld if such changes  would affect the schedule or cost of the  construction
of the Site and Shell

                                                                            -20-


Improvements or Tenant Improvements.

         10. LANDLORD'S REVIEW  RESPONSIBILITIES.  Tenant agrees and understands
that the review of the Conceptual Plans for the Tenant  Improvements,  the Draft
Working Drawings for the Tenant  Improvements and the Final Working Drawings for
the Tenant  Improvements  by  Landlord  is solely to protect  the  interests  of
Landlord  in the  Building  and the  Premises,  and  Landlord  shall  not be the
guarantor of, nor in any way or to any extent  responsible  for, the correctness
or accuracy of any such Draft Working  Drawings for the Tenant  Improvements  or
Final Working Drawings for the Tenant  Improvements or of the compliance of such
Draft Working Drawings for the Tenant Improvements or Final Working Drawings for
the Tenant Improvements with applicable Laws or of the conformance of such Draft
Working  Drawings for the Tenant  Improvements or Final Working Drawings for the
Tenant   Improvements   with  the  Working  Drawings  for  the  Site  and  Shell
Improvements  provided  by  Landlord  to Tenant.  Approval  by  Landlord  of the
Conceptual Plans for the Tenant Improvements, the Draft Working Drawings for the
Tenant  Improvements or the Final Working  Drawings for the Tenant  Improvements
prepared by Tenant shall not: (i) imply approval by Landlord as to compliance of
such  Draft  Working  Drawings  for the  Tenant  Improvements  or Final  Working
Drawings  for the  Tenant  Improvements  with  applicable  Laws;  (ii) imply the
compatibility of the Draft Working Drawings for the Tenant Improvements or Final
Working Drawings for the Tenant  Improvements  with the shell or the core or the
Working Drawings for the Site and Shell Improvements;  or (iii) limit Landlord's
right to require  changes in  portions  of the Final  Working  Drawings  for the
Tenant  Improvements  which are  incompatible  with or which,  in the reasonable
opinion of Landlord,  adversely affect the Building structure or the electrical,
plumbing,  life safety or mechanical systems of the Building or which affect the
availability to Landlord of third party warranties. In the event that, after the
approval by Landlord of the Final Working Drawings for the Tenant  Improvements,
Landlord modifies the Working Drawings for the Site and Shell  Improvements in a
manner which will require  modification  to the Final  Working  Drawings for the
Tenant  Improvements,  Landlord shall promptly so notify Tenant and Tenant shall
cause any such  required  modifications  to the Final  Working  Drawings for the
Tenant Improvements to be promptly made;  provided,  however, to the extent that
the  modifications to the Working  Drawings for the Site and Shell  Improvements
requested by Landlord are the result of the failure by  Landlord's  employees or
construction  managers (but not  Landlord's  architect) to use customary care in
coordinating  the  work  of the  architect  in the  preparation  of the  Working
Drawings for the Site and Shell Improvements,  then Landlord shall pay all costs
and  expenses  incurred  by  Tenant  as a result  thereof.  Landlord  shall  use
commercially  reasonable  efforts to cause the  agreement  with the architect to
require  that  such  architect  use  the  prevailing  standard  of  care  in the
architectural profession in the preparation of the Working Drawings for the Site
and Shell Improvements,  and Landlord shall use commercially  reasonable efforts
to enforce such agreement.


         11. COST OF TENANT  IMPROVEMENTS.  Upon the approval by Landlord of the
Final Working Drawings for the Tenant  Improvements,  Landlord shall obtain from
the contractor  selected by Landlord for the  construction  of the Base Building
Improvements a fixed-price for the construction of the Tenant  Improvements.  In
the event that such bid exceeds a sum equal to the Tenant Improvement Allowance,
Landlord shall so notify Tenant, and Tenant shall deposit,  in the manner herein
required,  immediately  available  funds  equal to the  amount by which such bid
exceeds  the  Tenant  Improvement  Allowance,  which  deposit  shall be held for
disbursement  to  Landlord  to  pay  expenses  of  construction  of  the  Tenant
Improvements  after the expenditure of the Tenant  Improvement  Allowance.  Such
deposit shall be made in the following manner:  (i) if required by lender of the
Construction  Financing,  such  deposit  shall be made into an account with such
lender at least five (5) days prior to the Commencement of  Construction,  as to
which account  Landlord  shall require the lender to pay interest to Tenant at a
reasonable  deposit rate;  or, (ii) in all 

                                                                            -21-


other  events,  such  deposit  shall  be  made  to an  escrow  agent  reasonably
satisfactory to both Landlord and Tenant on or before the later of the day which
is the tenth  (10th) day  following  the receipt by Tenant of a written  request
from Landlord for such deposit or the day which is the tenth (10th) day prior to
the commencement of construction of any of the Tenant  Improvements,  to be held
in an interest bearing account, with interest to be paid periodically to Tenant.
Expenses  paid  directly  from  such  funds  shall be  excluded  from  Aggregate
Development Cost, to the extent of the amount so paid.


         12.      CONSTRUCTION OF SITE AND SHELL IMPROVEMENTS.

                  12.1.  Construction  and  Substitutions.  The Site  and  Shell
Improvements shall be constructed by Landlord in substantial compliance with the
Working Drawings for the Site and Shell Improvements, although Landlord reserves
the right to make  substitutions  of  equipment or  materials  for  equipment or
materials  which are  specified  in the Working  Drawings for the Site and Shell
Improvements,  provided that all such substitutions shall be consistent with the
Descriptive  Base  Specifications.  Any  details  or  materials  which  are  not
specified in the Working Drawings for the Site and Shell  Improvements  shall be
completed  by  Landlord in a manner  consistent  with the  standards  of similar
buildings in Marin County, California. In the event Landlord so elects, Landlord
may commence  grading of the PG&E Property and other on- and off-site work prior
to the completion of the Working  Drawings for the Site and Shell  Improvements.
Landlord  shall use  commercially  reasonable  efforts to cause all  contractors
performing  any  portion  of the  Site  and  Shell  Improvements  or the  Tenant
Improvements to comply in all material respects with their respective contracts,
and  Landlord  shall  use  commercially   reasonable  efforts  to  enforce  such
contracts;  provided,  however,  that nothing  herein shall be deemed to prevent
Landlord  from using its  reasonable  judgment  in settling  disputes  with such
contractors or in accepting or permitting  variances  from the Working  Drawings
where such variances do not materially  affect the  performance or appearance of
the area of the Project where such variance occurs.  Nothing herein is, however,
intended  to  impose  upon  Landlord  any  liability  for  deficiencies  in  the
performance of any contractor, subcontractor or supplier.

                  12.2.  Changes  to  Working  Drawings  for the Site and  Shell
Improvements. Landlord may make changes to the Working Drawings for the Site and
Shell  Improvements,  provided  that each such change is approved by the City of
San Rafael and any lender or  prospective  lender of  Construction  Financing or
Take-Out  Financing,  if such  approval is required.  In the event that Landlord
plans a change to the  Working  Drawings  for the Site and  Shell  Improvements,
Landlord  shall so notify Tenant in writing,  which  writing  shall  describe in
detail the nature,  extent and location of the changes which  Landlord  plans to
make.  Tenant  shall  notify  Landlord  within five (5) days from the receipt by
Tenant of any such  submission  whether or not Tenant  agrees that the change to
the Working  Drawings for the Site and Shell  Improvements  would be  consistent
with the  Descriptive  Base  Specifications.  In the event that Tenant  fails to
respond to such  submission  within such period of five (5) days,  Landlord  may
give to Tenant a second notice stating such failure and further  stating that if
Tenant  does not  respond  within five (5) days of the receipt by Tenant of such
second  notice  from  Landlord,  Tenant  will be deemed to have  agreed that the
proposed change to the Working  Drawings for the Site and Shell  Improvements is
consistent with the Descriptive  Base  Specifications.  In the event that Tenant
fails to respond to such  submission  within such period of five (5) days of the
receipt by Tenant of such second  notice  from  Landlord,  Tenant  shall for all
purposes  be deemed  to have  agreed  that the  proposed  change to the  Working
Drawings for the Site and Shell  Improvements is consistent with the Descriptive
Base Specifications.  In the event of a dispute between Landlord and Tenant with
regard to the  question  of  whether  or not a  proposed  change to the  Working
Drawings  for the Site and  Shell  Improvements  would  be  consistent  with the
Descriptive Base  Specifications or as to any variances required to decrease the
Estimated  Phase I Project Cost if and to the extent that it is greater than One
Hundred  

                                                                            -22-


Eighty-Three  Dollars  ($183.00) per square foot of Gross Building Area,  either
Landlord or Tenant may require by written  notice to the other that such dispute
be resolved by  arbitration  conducted  in  accordance  with the  provisions  of
Section 0.


         13. INSPECTION BY TENANT. During the course of construction of the Site
and  Shell  Improvements  and  the  Tenant  Improvements,   Tenant  or  Tenant's
representative  shall, at Tenant's sole cost and expense,  at all times have the
right to inspect the construction; provided that Tenant, in the exercise of such
right,  shall not  unreasonably  interfere with or delay the prosecution of such
work  (except to the extent such work is delayed by the  necessity  of remedying
defective or incorrect work discovered by Tenant).  No exercise by Tenant of its
right to  inspect  the  construction  shall be deemed to affect  the  rights and
obligations  of  Landlord  and Tenant  with  respect to the work or any  defects
therein,  nor shall  such  exercise  be deemed  an  assumption  by Tenant of any
responsibility for the quality of the work.


         14.      CHANGE ORDERS.

                  14.1.  Right of Tenant to  Request  Modifications.  Tenant may
make  modifications  ("Modifications")  to the Final  Working  Drawings  for the
Tenant  Improvements  and/or to request that Landlord make  Modifications to the
Working  Drawings for the Site and Shell  Improvements,  provided that each such
Modification is approved by the City of San Rafael and any lender or prospective
lender of  Construction  Financing or Take-Out  Financing,  if such  approval is
required, and is made sufficiently prior to the construction of the part of work
to  which  the  Modification  would  be  made so that  the  Modification  can be
accommodated without resulting in a Tenant Caused Delay.  Modifications relating
to the Site and Shell Improvements or the Tenant Improvements or both shall only
be made with the consent of Landlord,  which consent  shall not be  unreasonably
withheld or delayed.  Any request by Tenant for  Modifications  shall be made in
writing to Landlord,  which writing shall describe in detail the nature,  extent
and location of the Modifications that Tenant requests be made.

                  14.2.  Preparation  of Plans for  Modifications.  In the event
that Tenant  requests a  Modification  to the Working  Drawings for the Site and
Shell Improvements,  Landlord shall cause its architect and other consultants to
prepare  drafts of revisions to those  portions of the Working  Drawings for the
Site and Shell  Improvements  which  Tenant has  requested  be the  subject of a
Modification,  and shall deliver to Tenant a copy of such draft, together with a
statement of  Landlord's  best  estimates  (made in good faith and in accordance
with  reasonably  competitive  prices and  reasonable  design  plans;  provided,
however,  that Tenant  recognizes  that  estimates will have to be provided in a
relatively short period of time, that there is some inherent  uncertainty in the
process of providing estimates, that estimates may be based on incomplete design
details due to time  constraints and that only one contractor will be negotiated
with)  of (i)  the  additional  cost  of  construction  of the  Site  and  Shell
Improvements or the Tenant  Improvements (which shall include without limitation
increased design costs,  increased  construction  costs and increased  financing
costs arising by reason of the resulting  Tenant Caused  Delays,  if any, in the
construction  schedule)  which  Tenant  will be required to pay by reason of the
proposed  Modification (the "Modification  Cost"); and, (ii) the duration of any
Tenant  Caused  Delay (as that term is defined  in  Section 0 below)  which will
arise by reason of such  Modification.  Landlord  shall also deliver to Tenant a
copy of any bids upon which  Landlord  based its  estimates.  Tenant shall elect
either to require  Landlord to proceed with the  Modification  or not to require
Landlord  to so proceed by written  notice to  Landlord  given  within  five (5)
business days of the receipt by Tenant of the draft of the modified  portions of
the Working Drawings for the Site and Shell Improvements and Landlord's estimate
of resulting costs and Tenant Caused Delays.  The failure by Tenant to make such
election in writing within such five (5) business day period shall  conclusively
be deemed to be an election by Tenant not to proceed 

                                                                            -23-


with the  Modification.  In the event that  Tenant  elects to  proceed  with the
Modification:  (i) Tenant shall, at least five (5) business days before the date
upon which Landlord,  in its reasonable judgment,  must direct the contractor to
proceed with the  Modification  (of which date  Landlord  shall notify Tenant in
writing at least two (2) days  before  such  date),  deposit  with  Landlord  or
Landlord's lender (as Landlord may direct)  immediately  available funds (or, if
the  lender of the  Construction  Financing  will so permit  without  additional
requirements upon Landlord,  a letter of credit) equal to Landlord's estimate of
the  Modification  Cost; and, (ii) Landlord shall cause the Working Drawings for
the Site  and  Shell  Improvements  to be  modified  as set  forth in the  draft
portions thereof given to Tenant in response to its request and shall thereafter
construct the Site and Shell Improvements in accordance with such Modifications.
In the event that the actual Modification Cost differs from the amount estimated
by Landlord,  Landlord shall so notify Tenant,  and, within five (5) days of the
receipt by Tenant of such notice, Landlord shall refund to Tenant the amount (if
any) by which the  actual  Modification  Cost was less than  that  estimated  by
Landlord,  or Tenant  shall pay to  Landlord  the  amount  (if any) by which the
actual Modification Cost exceeded that estimated by Landlord.  In the event that
Tenant  elects not to proceed  with the  Modification,  Tenant  shall  reimburse
Landlord upon demand for all reasonable  architect's  fees and other  reasonable
costs  incurred by Landlord as a result of the  preparation  of the draft of the
modified  portions of the Working Drawings for the Site and Shell  Improvements,
and, if any Tenant  Caused Delay has resulted  from the request,  Tenant  shall,
within five (5) business days of the receipt by Tenant of a written request from
Landlord  accompanied by a reasonably detailed  explanation of costs incurred or
to be incurred,  reimburse  Landlord for the cost of such Tenant  Caused  Delay.
Landlord shall,  however, use all reasonable efforts to minimize the duration of
any Tenant Caused Delays resulting solely from the necessity of Landlord causing
drafts and estimates to be prepared in response to Tenant's request.


         15.      CONSTRUCTION RELATED MATTERS.

                  15.1. Target Date For Commencement.  Landlord and Tenant agree
to use commercially  reasonable  efforts to obtain all Necessary  Approvals,  to
prepare  and  approve  plans,   specifications   and  working   drawings,   hire
contractors, and take such other steps as may be required so that Landlord is in
a position to commence  construction of the Site and Shell  Improvements by June
1, 1998. Landlord and Tenant both acknowledge and agree, however, that such date
is a target for  commencement  of  construction  and that such  commencement  is
subject to numerous factors beyond the control of either Landlord or Tenant.  In
the  event  that  Landlord  is  unable,  despite  the  use of  its  commercially
reasonable  efforts in the  circumstances,  to obtain all required  governmental
approvals,  to prepare and approve plans,  specifications  and working drawings,
hire contractors,  and take such other steps as may be required so that Landlord
is in a position to commence  construction of the Site and Shell Improvements by
June 15, 1998,  Landlord may defer the  Commencement  of Construction to June 1,
1999 by written notice to Tenant.

                  15.2.   Schedule   Requirements  in  Construction   Contracts.
Landlord  shall  require  that the  contract  between  Landlord  and its general
contractor for the  construction  of the Site and Shell  Improvements  contain a
commercially  reasonable schedule for the Substantial  Completion of each of the
Floors within the  Buildings,  which  schedule will be subject to the consent of
Tenant,  which  consent  shall not be  unreasonably  withheld or  delayed.  Such
contract  shall also  provide  for the  contractor  to pay a  reasonable  sum as
liquidated  damages for each day that Substantial  Completion is not achieved in
accordance with the approved  schedule,  although such contract may also provide
for the  schedule to be extended  without the payment of such damages for delays
which are caused by Force Majeure Events.

                  15.3.  Notice  of  Substantial  Completion.  When  Substantial
Completion of a particular Floor within a Building has occurred,  Landlord shall
give Tenant written notice thereof (a "Floor  Substantial  Completion  Notice").
The  fact  that the  landscaping,  exterior  plazas,  parking  

                                                                            -24-


lots,  driveways,  walkways,  or other Floors of the Project or another  Phase I
Building have not been completed  shall not prevent  Landlord from  delivering a
Floor Substantial  Completion Notice to Tenant and delivering the Floor which is
Substantially Complete.  Landlord and Tenant shall prepare a Punch List of items
pertaining  to the Floor which is then  Substantially  Complete  within ten (10)
business  days after the receipt by Tenant of the Floor  Substantial  Completion
Notice,  which  Punch List shall  specify  the items of work on such Floor which
have not been completed. Landlord shall use all reasonable diligence to complete
the items on such Punch List within thirty (30) days thereafter.

         16.      NOTICES OF COMPLETION AND DEFECTS.

                  16.1.  Project  Substantial  Completion Notice and Acceptance.
Upon the Substantial  Completion of all of the Site and Shell  Improvements  and
the Tenant  Improvements,  Landlord  shall give  Tenant  written  notice of such
completion  (a "Project  Substantial  Completion  Notice"),  and Tenant shall be
deemed to have fully accepted the Work as satisfactorily completed in accordance
with all requirements of this Leasehold Improvements Agreement and shall further
be deemed to have  waived any  defects  in any such  Work,  except to the extent
that:

                           A. Tenant  shall  furnish  Landlord  with a list (the
         "Punch List") within ten (10) business days after the receipt by Tenant
         of the Project  Substantial  Completion Notice,  which Punch List shall
         specify the items of work which have not been completed;

                           B. Tenant  shall  furnish  Landlord  with a list (the
         "Defect List") within three (3) months after the date of the receipt by
         Tenant of the Project  Substantial  Completion  Notice,  specifying any
         defects in the  construction of Work which were discovered prior to the
         end of such three (3) month  period  (provided  that Tenant  shall also
         notify  Landlord  of any such  defect  within a  reasonable  time after
         discovering it); and,

                           C. Tenant  shall  furnish  Landlord  with a list (the
         "HVAC  Defect  List")  within  twelve (12) months after the date of the
         receipt  by  Tenant  of  the  Project  Substantial  Completion  Notice,
         specifying  any defects in the  construction  of those  portions of the
         HVAC system  serving the Project which are a part of the Work and which
         were  discovered  prior to the end of such  twelve  (12)  month  period
         (provided  that Tenant  shall also  notify  Landlord of any such defect
         within a reasonable time after discovering it).

                  16.2.  Assignment of Warranty Rights by Landlord.  Within five
(5)  days of the  delivery  of the  Project  Substantial  Completion  Notice  by
Landlord to Tenant,  Landlord shall assign to Tenant,  pursuant to an assignment
agreement in a form reasonably acceptable to Landlord and Tenant, all warranties
and  guarantees  from all  manufacturers,  equipment  suppliers and  contractors
related to the Project; provided,  however, that such assignment agreement shall
also permit Landlord to retain the right to enforce any such warranties.

                  16.3.  Corrections  by Landlord.  Landlord  shall commence the
correction of each of the items on the Punch List, the Defect List, and the HVAC
Defect  List  within  twenty  (20) days of the receipt by Landlord of such Punch
List or earlier  notice of such defect  (unless a particular  defect  materially
interferes  with the use by Tenant of any of the  Buildings or other  portion of
the Work,  in which event  Landlord  shall  commence the required  correction as
promptly as is reasonably  feasible in the  circumstances  and shall  thereafter
diligently  prosecute  such  correction  to  completion).  The cost,  if any, to
Landlord of such corrections shall be a part of Phase I Project Cost, or, if the
final Phase I Project Cost has been established  under the Lease, then such cost
shall be an Expense under the Lease.  Landlord shall, if reasonably  possible in
the circumstances,  complete any required correction within thirty (30) business
days of the receipt by Landlord of such list or earlier notice of such defect.

                                                                            -25-


         17.      DELAYS.

                  17.1.  Tenant Caused Delays.  To the extent that a delay shall
occur in the  Substantial  Completion of a Floor or of the Project as the direct
or indirect  result of a delay with regard to one or more  critical path aspects
of the Project fairly attributable to the acts or omissions of Tenant; then: (i)
any such delay shall extend the date for the completion by Landlord of that part
of the Work  which is delayed  by one (1) day for each day of such  delay;  and,
(ii) Tenant shall reimburse Landlord on demand for all additional costs incurred
by Landlord  as a result of such  delays  (including,  without  limitation:  (a)
increased  design  costs,  (b)  increased   construction  costs,  (c)  increased
development  management  costs,  and (d)  increased  financing  costs or fees in
connection  with  loan  extensions  or  replacements  required  by reason of the
resulting delays, if any, in the construction schedule;  provided, however, that
any amount so reimbursed by Tenant shall be excluded from Aggregate  Development
Cost). In addition, any such delay in the Substantial Completion of construction
shall extend all dates for the Substantial Completion by Landlord of any work to
be  performed  by it on the  Phase I Land,  the  Phase  II Land or a  particular
Building  by one (1) day for each day of such delay in  Substantial  Completion;
and,  the Rent  Commencement  Dates under the Lease shall each be deemed to have
occurred  one (1) day  sooner  than the day upon  which the  conditions  for the
occurrence of each such date are actually  fulfilled for each day of such delay.
The following is a  non-exclusive  list of the kinds of acts or omissions  which
could, depending on the applicable facts and circumstances, result in a delay in
the  Substantial  Completion  of a Floor:  (i) any delay of  Tenant,  beyond the
periods  provided in this Leasehold  Improvements  Agreement for the response of
Tenant,  in giving any  consent or approval  which is required  pursuant to this
Leasehold Improvements Agreement; (ii) any request by Tenant that Landlord delay
any element, or the completion, of construction; (iii) any request by Tenant for
a Modification  or any  Modification  undertaken at the request of Tenant or any
change to any of the Final Working  Drawings for the Tenant  Improvements  after
such Final Working Drawings for the Tenant Improvements have been approved; (iv)
any event of default by Tenant under the Lease, the Option Agreement,  the Phase
II  Purchase  Agreement  or any Event of Tenant  Default  under  this  Leasehold
Improvements  Agreement;  (v)  any  interference  by  Tenant  or its  agents  or
contractors  with the  prosecution by Landlord of the Work;  (vi) any reasonably
necessary  displacement  of  any  construction  from  its  place  in  Landlord's
construction schedule resulting from any of the causes for delay described above
and the fitting of such construction back into such schedule; or (vii) any delay
in  obtaining  any  approval  or permit from the City of San Rafael or any other
governmental  entity or any utility company or district resulting from any other
delay referred to in this Section 0. Following a determination  by Landlord that
a Tenant Caused Delay is  reasonably  likely to result from an event of the kind
referred to in this Section 0, Landlord  shall give written notice of such event
to Tenant.  Landlord  shall use  Landlord's  reasonable  efforts to minimize the
length of any such delay and to mitigate or eliminate  the effects of such delay
in subsequent parts of the work,  which reasonable  efforts may include overtime
to the extent  reasonably  requested by Tenant to minimize the adverse  economic
consequences  to  Tenant of such  delay,  but only if and to the  extent  Tenant
agrees to reimburse  Landlord  upon demand for any  incremental  increase in the
cost of  performing  the work as to which  such  overtime  is used.  The  delays
described  in this  Section 0 are  referred  to in this  Leasehold  Improvements
Agreement as "Tenant Caused Delays".  Tenant  acknowledges that, because grading
of the site will only be  permitted  during  certain  months,  relatively  brief
delays may result in a lengthy postponement of the commencement of grading until
it can be  undertaken  during a month in which  grading  is  permitted,  and the
duration  of any such  delay in such  grading  shall be taken  into  account  in
determining the duration of any Tenant Caused Delay.

                  17.2.  Force  Majeure  Delays.  To the extent that Landlord or
Tenant shall be delayed in or prevented  from the  performance of any act (other
than Tenant's  obligation to make  payments of rent,  additional  rent and other
charges  required  hereunder or under the Lease) solely by 

                                                                            -26-


reason of restrictive  governmental  laws or  regulations,  governmental  delays
beyond a reasonable and customary period for the issuance of any required permit
or approval,  actions  initiated by a third party  resulting in a judicial order
which restrains or enjoins activity  necessary to the completion of the Site and
Shell  Improvements  and/or the Tenant  Improvements  or which would prevent the
accrual of vested rights to complete the Project,  industry-wide  craft strikes,
unavailability  of  materials,  riots,  insurrections,   epidemics,   quarantine
restrictions, acts of God, an Event of Default on the part of the other party to
this  Leasehold  Improvements  Agreement,  war or damage to work in  process  by
reason of fire,  flood,  earthquake or other casualty,  then performance of such
act  shall be  excused  for the  period  of the  delay  and the  period  for the
performance of such act shall be extended for a period  equivalent to the period
of such delay.  Notwithstanding the foregoing, lack of funds shall not be deemed
to be a cause beyond the control of either party.  Landlord shall use Landlord's
reasonable  efforts  to  minimize  the  length  of any such  delay.  The  delays
(including,  without limitation, Tenant Caused Delays) described in this Section
0 are referred to in this Leasehold Improvements Agreement as "Delays".

                  17.3.  Statements  of Landlord  as to Delays.  Within ten (10)
business days of a written request from Tenant,  Landlord shall give to Tenant a
written  statement setting forth a description of the cause for and duration (by
dates of  commencement  and cessation or, as to Delays which have not yet ended,
estimated date of cessation) of all Delays in the Work which  Landlord  contends
have  occurred  prior to the date of such  statement or which are  continuing to
occur  as of the date of such  statement.  Such  statement  shall  also  specify
whether or not Landlord  contends a particular  Delay was a Tenant  Caused Delay
and shall  specify  the extent  (if any) to which  Landlord  contends  that each
particular  Delay has  affected  the  Substantial  Completion  (or,  for a Delay
occurring  after  Substantial  Completion,  affected the final  completion) of a
particular Building through the date of such statement.  Landlord shall be bound
by, and Tenant  shall be entitled to rely on, such  statements  for all purposes
(except with respect to estimated dates of cessation in the case of Delays which
have not  ended  as of the date of such  statement),  although  nothing  in such
statements  shall be deemed to bind  Tenant  with  respect to the  existence  or
duration of any Delay  claimed by Landlord or to bind  Landlord  with respect to
Delays  caused by events of which  Landlord  is not aware as of the date of such
statement.  Tenant  shall not be  entitled  to  request  such a  statement  from
Landlord more than once in any period of thirty (30) consecutive days.

                  17.4.  Minimization  of Delays.  Upon the receipt by Tenant of
any notice of Delay from  Landlord,  Tenant may elect to direct  Landlord to use
such  overtime as may  reasonably  be  required  in the  judgment of Landlord to
minimize the duration of any Delay. Such request shall be deemed a request for a
Modification  by  Tenant,  and the  parties  shall  have  the  same  rights  and
responsibilities  with respect to such a request as they would have with respect
to any other requested Modification.


         18.      PROJECT FINANCING

                  18.1. Right and Obligation to Arrange. Landlord shall have the
sole and  exclusive  right to arrange for  Construction  Financing  and Take-Out
Financing for the Project,  in accordance with the provisions of this Section 0.
Except as  otherwise  provided  in Section 0,  Landlord  shall be  obligated  to
arrange for or provide all equity and loan proceeds  required to pay the Phase I
Project Cost.

                  18.2.  Retaining  a  Mortgage  Broker  to  Arrange  Financing.
Landlord shall, at such time as Landlord may select, retain a mortgage broker of
Landlord's choosing for the purpose of researching and negotiating  Construction
Financing  for the Project.  Tenant shall not,  either  directly or  indirectly,
solicit  or  respond  to  quotations  from  potential  lenders  with  respect to
conventional  real  estate  financing  at any time prior to the  exercise of the
"First Option" by Tenant  

                                                                            -27-


pursuant  to, and as defined  in, the Option  Agreement.  Tenant  may,  however,
inquire directly from potential lenders only as to the availability to Tenant of
off-balance sheet financing.

                  18.3.  Selection  of Lender and  Negotiation  of  Construction
Financing.  Landlord  shall  choose,  from among  those who give  quotations  to
Landlord,  one or more of the potential  lenders with which to negotiate for the
Construction Financing which Landlord then desires to obtain, the costs of which
shall not  exceed in the  aggregate  the  amount  which is then  reasonable  for
construction  financing  for a project  of the type,  size,  location  and other
characteristics of the Project.

                  18.4.   Selection  of  Lender  and   Negotiation  of  Take-Out
Financing. Landlord shall select and arrange Take-Out Financing for the Project.

                  18.5.  Inability to Obtain Commitment for Take-Out  Financing.
In the  event  that  Landlord  elects  by  written  notice to Tenant to obtain a
commitment for Take-Out  Financing  meeting the Criteria for Take-Out  Financing
and thereafter uses commercially  reasonable efforts to obtain a commitment from
the lender offering such Take-Out Financing,  but thereafter reasonably believes
that it will not be able for any reason not within the  control of  Landlord  to
obtain a binding  commitment which satisfies the Criteria for Take-Out Financing
and which is otherwise  acceptable to Landlord in the exercise of its reasonable
discretion,  Landlord shall so notify Tenant.  During the immediately  following
fifteen (15) days,  Landlord and Tenant shall meet and  negotiate to agree on an
alternative  basis for consummating the transaction  which is acceptable to both
of them in the exercise of their  respective  sole  discretion.  If Landlord and
Tenant fail to so agree within such fifteen (15) day period,  then Landlord may,
in its sole  discretion,  elect by  written  notice to Tenant to  terminate  the
Lease, this Leasehold Improvements Agreement, the Option Agreement and the Phase
II  Purchase  Agreement  (but not less  than all of them) by  written  notice to
Tenant.  Such  termination  shall be  effective  upon and as of the sixth  (6th)
business  day  following  the date upon which Tenant  receives  such notice from
Landlord,  unless Tenant  exercises the First Option under the Option  Agreement
prior to the  effective  date of such  termination.  In the event that Tenant so
exercises  the First Option,  then Tenant shall  purchase the PG&E Property from
Landlord in its then condition,  "as is, with all faults",  except that Landlord
shall have the right set forth in Section 2.13 of the Option Agreement.

                  18.6.  Other  Funds.  Landlord  may,  in its sole  discretion,
choose to provide funds for the purposes of Take-Out  Financing  from sources or
loans which do not meet the Criteria for Take-Out Financing,  which funds may be
greater in amount than those stated in the Criteria for Take-Out Financing.

                  18.7.  Contribution  of  Tenant.  In the event  that  Landlord
estimates that the Estimated Phase I Project Cost will exceed an amount equal to
One Hundred  Eighty-Three  Dollars  ($183.00) per square foot of Gross  Building
Area in the Buildings to be located in Phase I, Landlord may so notify Tenant in
writing and request  that Tenant  provide  Construction  Financing  and Take-Out
Financing for the Project in an amount equal to the lesser of: (i)  seventy-five
percent of the amount by which the Phase I Project Cost exceeds the amount equal
to One Hundred  Eighty-Three Dollars ($183.00) per square foot of Gross Building
Area in the  Buildings  to be located in Phase I; or,  (ii) Seven and  50/100ths
Dollars  ($7.50) per square foot of Gross  Building  Area in the Buildings to be
located  in Phase I.  _.In the event  that  Landlord  delivers  such a notice to
Tenant: (i) Tenant shall provide such funds to Landlord as and when requested by
Landlord,  but only  after  Landlord  has  invested  in the  Project  an  equity
contribution equal to fifteen percent (15%) of the Phase I Project Cost, as such
Phase I Project Cost is  estimated in good faith by Landlord;  (ii) Tenant shall
be entitled to receive monthly  payments of interest only at the rate of fifteen
percent (15%) per annum,  commencing as of the Last Rent  Commencement  Date and
continuing  during the Term of the Lease;  (iii)  interest shall accrue from the
time that such  funds are paid by Tenant to the 

                                                                            -28-


day immediately preceding the Last Rent Commencement Date at the rate of fifteen
percent  (15%)  per  annum,  and the  amount  so  accrued  shall be added to the
principal;  (iv) such loan shall be secured by a Deed of Trust  encumbering  the
Project in the standard form used by First American Title Company of Marin as of
the date of the  making of such  loan or,  if such a deed of trust  would not be
acceptable to any  Mortgagee of a Mortgage  securing  Construction  Financing or
Take-Out Financing, then by other security reasonably acceptable to Landlord and
Tenant and acceptable to such Mortgagee;  and, (v) Tenant shall  unconditionally
subordinate  its  interest  under  such  Deed of Trust to the  interests  of the
mortgagee  of any  mortgage or the holder of any other deed of trust  securing a
loan  against the  Project,  provided  that the  aggregate  amount of  principal
indebtedness secured by all such mortgages and deeds of trust to which Tenant is
required  to be  subordinate  at any time is equal to or less  than the  Phase I
Project  Cost.  Any funds so advanced by Tenant,  together  with any accrued and
unpaid interest  thereon,  shall be due and payable by Landlord to Tenant on the
fifth (5th) anniversary of the Last Rent Commencement Date.

                  18.8.  Cooperation  of Tenant in  Construction  Financing  and
Take-Out Financing.

                         A.  Because of the rights of Tenant to acquire the PG&E
Property pursuant to the Option Agreement, Tenant may be required by the lenders
of the Construction  Financing or the Take-Out  Financing or both to execute the
loan  documents as a prospective  borrower or successor  borrower.  Tenant shall
execute,  within  five  (5)  days  of  a  written  request  from  Landlord,  any
commercially  reasonable  loan documents  which the lender  requires that Tenant
execute,  provided  that no such loan  document  shall  require that Tenant have
personal liability for the repayment of any indebtedness on such loan, except in
an amount equal to the aggregate monetary  obligations of Tenant under the Lease
during the then  remaining  Term and any Extended  Terms as to which Tenant then
has an unexpired  right to extend the Term of the Lease and except for customary
personal liability exceptions,  such as those pertaining to Hazardous Materials,
misapplication  of funds  and  misrepresentation.  Without  limiting  any  other
provision of such loan documents, such loan documents may condition the right of
Tenant  to  exercise  its  option  pursuant  to  the  Option  Agreement  on  the
maintenance  by Tenant of  reasonable  net worth or other  financial  standards,
provided  that such  standards  are  reasonably  related to, and less than,  the
financial  condition  of  Tenant as of the date of this  Leasehold  Improvements
Agreement.  Tenant shall also execute such instruments  subordinating its rights
and  interests  pursuant to the Option  Agreement to the rights and interests of
the lender pursuant to the loan documents, provided that such lender shall agree
in  writing  to  recognize  the  rights of Tenant  under  the  Option  Agreement
following a foreclosure  of the Mortgage,  subject to such  restrictions  on the
liability and obligations of the lender as the lender may reasonably  require in
the circumstances.

                         B. If required by a  Mortgagee  of Take-Out  Financing,
Tenant shall agree to such commercially  reasonable amendments to the provisions
of the Lease and this  Leasehold  Improvements  Agreement as such  Mortgagee may
require,  provided that the amount of Basic Monthly Rent,  Real Estate Taxes and
Expense for which  Tenant is liable  shall not be affected by reason of any such
amendment and the  Permitted  Use and the other rights and  privileges of Tenant
under the Lease and this  Leasehold  Improvements  Agreement are not  materially
impaired or reduced.

                  18.9.  Financial  Covenants  of  Tenant.  In the  event of any
material  diminution in the financial  condition or  creditworthiness  of Tenant
occurring  after the date of this Leasehold  Improvements  Agreement which could
reasonably be expected to result, or which has then resulted, in increased costs
of  financing  or other  economic  losses to Landlord  which would not have been
incurred had no such diminution occurred,  Landlord may notify Tenant in writing
that Landlord proposes to increase the Agreed Spread for Take-Out Financing by a
specified  amount to take into  account the amount of increase in rate caused by
such diminution or to require that Tenant pay to 

                                                                            -29-


Landlord the increased costs of financing or other economic losses. Such written
notice to Tenant (a  "Creditworthiness  Adjustment  Notice") from Landlord shall
state the  grounds on which  Landlord  has  concluded  that  increased  costs of
financing  or other  economic  losses  will result or has  resulted  from such a
diminution.  In the  event  that  Tenant  contends  that no  increased  costs of
financing or other  economic  losses will result or has  resulted  from any such
diminution  or that the  amount of the  increased  costs of  financing  or other
economic  losses  described by Landlord is greater than that  required to fairly
reflect the increased costs of financing or other economic losses caused by such
diminution, Tenant may give to Landlord a written notice (a "Contention Notice")
stating  such  contention  within  fifteen (15) days of the receipt by Tenant of
such a notice  from  Landlord,  which  notice  shall  state the grounds on which
Tenant has  concluded  that no increased  costs of  financing or other  economic
losses will result or has resulted  from such a diminution or that the amount of
the increased costs of financing or other economic losses  described by Landlord
is  greater  than that which will  occur or has  occurred.  Upon the  receipt by
Landlord of such a notice from Tenant  within such  period,  Landlord and Tenant
shall  meet and confer  for a period of ten (10) days  regarding  whether or not
increased  costs of financing or other economic losses will or has resulted from
such a diminution  and as to the amount of the  adjustment  to the Agreed Spread
for Take-Out Financing or other payments, if any, required to fairly reflect the
increased  costs of  financing  or other  economic  losses.  In the  event  that
Landlord and Tenant are unable to agree as to whether or not increased  costs of
financing or other  economic  losses will or has resulted from such a diminution
and as to the amount of the adjustment or payments,  if any,  required to fairly
reflect  such  increase or losses,  then  either may require  that the matter be
resolved by arbitration  conducted in accordance  with the provisions of Section
0. In the event that such  arbitration  results in an award  determining that an
increase in the Agreed  Spread for Take-Out  Financing  would be required in the
circumstances  to fairly reflect the increase in rate caused by such diminution,
then the Agreed Spread for Take-Out  Financing  shall be increased in the manner
so  determined  in the  arbitration  award.  In the event that such  arbitration
results in an award  determining that Tenant should pay to Landlord an amount to
compensate  Landlord for increased costs of financing or other economic  losses,
then Tenant  shall make such  payments to Landlord in the manner and at the time
described in the  arbitration  award.  In the event that Tenant fails to give to
Landlord  a  Contention  Notice  within  the time  period for the giving of such
notice  provided in this Section 0,  Landlord may give to Tenant a second notice
stating  such  failure and further  stating  that if Tenant does not give such a
Contention  Notice  within five (5) days of the receipt by Tenant of such second
notice from Landlord,  the  adjustments or payments or both proposed by Landlord
will become final.  In the event that Tenant fails to respond to such submission
within  such  period of five (5) days of the  receipt  by Tenant of such  second
notice from  Landlord,  then the  adjustments  or  payments or both  proposed by
Landlord will become final and not subject to challenge by Tenant.

                  18.10.   Prevailing   Wages.   Landlord   and  Tenant   hereby
acknowledge  that a lender of  Construction  Financing or Take-Out  Financing or
both may require  that  prevailing  wages be paid or that union labor be used in
connection with the construction of the Project,  and Landlord and Tenant hereby
agree that Landlord and Tenant shall comply with any such  requirements  imposed
by such a lender.

                  18.11.  Security  Deposit.  In the  event  that  the  terms of
Take-Out  Financing  require that Tenant  deliver to Landlord a deposit or other
security for the  performance  by Tenant of its  obligations  under the Lease or
this Leasehold  Improvements  Agreement (or both),  then Tenant shall so deliver
the required deposit or other security in the form and amount,  which deposit or
other security shall be held,  applied and disbursed by Landlord pursuant to the
provisions of Section 34 of the Lease.


         19.      DETERMINATION OF MONTHLY BASE RENT

                                                                            -30-


                  19.1. Initial Monthly Base Rent. The Initial Monthly Base Rent
shall be in an amount  equal to the product of: _. (i) the total Phase I Project
Cost; multiplied by, (ii) the Development Constant.

                  19.2.  Selection of Designated Treasury Rate.

                         A. The Designated  Treasury Rate shall be determined on
a date  selected by  Landlord,  which date must fall no later than  fifteen (15)
days  after the date on which  the first of the  following  events  occurs:  (i)
Landlord enters into a binding agreement to sell,  convey or otherwise  transfer
in the  aggregate  fifty  percent  (50%) of the  interests in the Project to any
person or entity  other than  Tenant  (except a  conveyance  or  transfer to any
person  who is a  constituent  partner  in  Landlord  or the holder of an equity
interest  in a  constituent  partner  in  Landlord);  (ii)  Landlord  receives a
commitment  from a lender to provide the  Take-Out  Financing at a fixed rate of
interest (as opposed to a fixed spread over an index); (iii) Landlord receives a
commitment  from any other person or entity to provide  funds at a fixed rate of
interest in an amount greater than Eight Million Dollars ($8,000,000.00) for the
purposes of Take-Out  Financing  pursuant to Section 0. For the purposes of this
Section 19.2,  the term "fixed" shall mean set at unvarying rate for a period of
at least one (1) year.  Notwithstanding the foregoing provisions of this Section
0, Landlord shall select the Designated Treasury Rate not later than the earlier
to occur of the date upon which  Landlord  designates  the Initial  Monthly Base
Rent in accordance with Section  19.3(iii) or the date which is ninety (90) days
after Tenant  delivers to Landlord a written  request that  Landlord  select the
Designated Treasury Rate. If Tenant delivers such written request, then Landlord
may, at its option,  purchase a forward  commitment  to fix the rate of interest
(as  opposed  to fixing a spread  over an index)  under the  Take-Out  Financing
covering  the period  commencing  on the date  Landlord  selects the  Designated
Treasury Rate in response to Tenant's  request and ending on the date upon which
Landlord  reasonably  estimates it will be designating  the Initial Monthly Base
Rent  in  accordance  with  Section  19.3(iii),  and the  cost  of such  forward
commitment  shall be included in Phase I Project Cost.  For the purposes of this
Section 19.2.A.  only: (i) the cost of such forward  commitment shall be paid to
the lender of the Take-Out  Financing in points and not by increasing the spread
of the  interest  rate  applicable  thereunder;  (ii) the  cost of such  forward
commitment  shall not be  subject  to the  limitations  on the cost of  Take-Out
Financing  set  forth in the other  provisions  of this  Leasehold  Improvements
Agreement; and, (iii) the cost of such forward commitment shall not be deemed to
be included in costs reimbursed as a part of Agreed Take-Out  Financing  Closing
Costs. The Designated  Treasury Rate shall be an approximation of the rate which
would be quoted  forward in the futures  markets  for the sale of United  States
Treasury  Bonds with  maturities  of  fifteen  (15)  years,  which rate shall be
determined by extrapolating  between the quoted rates for United States Treasury
Bonds with maturities of ten (10) and thirty (30) years as of the date for which
a quote  can be  obtained  that is  closest  to the  date  upon  which  Landlord
reasonably predicts that the Last Term Commencement Date will occur.

                         B.  Landlord  shall  deliver to Tenant,  within one (1)
business day after the  occurrence  of the  applicable  event  described  above,
written  notice (a "Rate  Designation  Notice")  of the date on which such event
occurred, and within two (2) business days after Landlord selects the Designated
Treasury  Rate in  accordance  with this Section 0,  Landlord  shall  deliver to
Tenant written  notice of such selection date and the Designated  Treasury Rate.
Failure  by  Landlord  to  deliver  either  or both of such  notices  shall  not
constitute  a  waiver  of the  right  of to set the  Designated  Treasury  Rate,
although  a failure  by  Landlord  to  select a date as of which the  Designated
Treasury  Rate is to be  established  on or  before  the last day of the  period
during  which such date  could  occur,  as such  period is  provided  in Section
19.2.A,  shall result in the date as of which the Designated Treasury Rate is to
be established being the last day of such period.

                         C. In the event that  Landlord has  previously  given a
Rate  Designation  Notice to Tenant,  but  Commencement of Construction  has not
occurred on or before August 1, 

                                                                            -31-


1998,  Landlord may give to Tenant a second Rate Designation  Notice at any time
thereafter  and prior to the Last Rent  Commencement  Date,  and the  Designated
Treasury Rate shall be  determined as of the date  specified by Landlord in such
second  Rate  Designation  Notice;  provided,  however,  that if the  failure to
achieve  Commencement  of  Construction  was  solely  due to causes  within  the
complete  control of Landlord,  then the Designated  Treasury Rate shall be that
selected  by reason of the prior Rate  Designation  Notice  given by Landlord to
Tenant.

                         D. In accordance  with Sections 2.14,  3.13 and 4.12 of
the Option  Agreement,  in the event that Landlord has  previously  given a Rate
Designation Notice to Tenant, but Tenant exercises one of the options granted in
the Option  Agreement but thereafter  defaults in its obligation to purchase the
PG&E Property in accordance with the terms of the Option Agreement, Landlord may
give to Tenant another Rate Designation Notice in accordance with the provisions
of Section 0, and the  Designated  Treasury  Rate shall be  determined as of the
date specified by Landlord in such other Rate Designation Notice.

                  19.3.  Estimation and  Redetermination of Initial Monthly Base
Rent.

                                (i)   As  of  the   date   of   this   Leasehold
Improvements  Agreement,  and based on the information available to Landlord and
Tenant as of that date,  Landlord and Tenant  estimate that the Initial  Monthly
Base Rent will be  approximately  Three  Hundred Five Thousand Two Hundred Fifty
Dollars  ($305,250.00)  per month,  based upon an  estimate  that total  Phase I
Project Cost will be in the approximate  amount of Thirty-Three  Million Dollars
($33,000,000.00)  and that the Development Constant will be approximately eleven
and one-tenth percent (11.1%).

                                (ii) In the event that the  Designated  Treasury
Rate has not been  determined  on or before  the First Rent  Commencement  Date,
Landlord shall, on or before the First Rent Commencement  Date, notify Tenant in
writing  of  Landlord's  revised  estimate  of the  Initial  Monthly  Base Rent,
specifying both Landlord's  revised good faith estimate of total Phase I Project
Cost and of the Development Constant as of the date of such notice. Such revised
estimate  shall  constitute  the  Initial  Monthly  Base Rent until the  Initial
Monthly Base Rent is finally determined in accordance with Section 0.

                                (iii) Within sixty (60) days  following the Last
Rent  Commencement  Date,  Landlord shall notify Tenant in writing of Landlord's
determination of the final Initial Monthly Base Rent, specifying both Landlord's
then  current  good  faith  estimate  of total  Phase I Project  Cost and of the
Development  Constant  upon  which  Landlord's  determination  of final  Initial
Monthly Base Rent shall be based.  Such  estimates of total Phase I Project Cost
and of the Development  Constant shall be based on the most current  information
then available to Landlord, and shall include an explanation of any changes from
the estimate (if any) given in accordance with Section 0.

                                (iv) Tenant  acknowledges  that the estimates to
be  given  by  Landlord  to  Tenant  in  accordance  with  this  Section  0 will
necessarily be based on incomplete  information and will therefore be subject to
inherent uncertainties.  Landlord shall make such estimates in good faith, based
on the information available to Landlord at the time the estimate is to be made.
Tenant  hereby  acknowledges  that Landlord will not be bound by any estimate so
given,  and  that no  previous  estimate  shall  be taken  into  account  in any
redetermination  of Initial  Monthly  Base Rent  required by this  Section 0. No
failure by Landlord to give to Tenant a revised estimate of Initial Monthly Base
Rent, or to  redetermine  the Initial  Monthly Base Rent within the time periods
herein  required  shall  constitute  a waiver by  Landlord of the right to do so
thereafter. The foregoing  notwithstanding,  in the event that Landlord fails to
notify  Tenant of a  redetermination  within the time  period  provided  herein,
Tenant shall give to Landlord a notice stating such failure 

                                                                            -32-


and  warning  Landlord  that a failure to give such a notice  could  result in a
waiver of the right to do so. If Landlord  does not give to Tenant a notice of a
redetermination  of Initial  Monthly  Base Rent  within  thirty (30) days of the
receipt by Landlord of such  notice from  Tenant,  Tenant may give to Landlord a
second notice stating such failure and further stating that if Landlord does not
give such a notice  of  redetermination  within  ten (10)  business  days of the
receipt by Landlord of such second  notice from Tenant,  Landlord will be deemed
to have waived the right to such a  redetermination.  In the event that Landlord
fails to respond to such notice  within such period of ten (10) business days of
the receipt by Landlord of such second  notice from  Tenant,  Landlord  shall be
deemed to have waived the right to such a  redetermination,  unless such failure
was caused by a Force Majeure Event, in which event Landlord shall not be deemed
to  have  waived  such  a   redetermination   if  Landlord  gives  a  notice  of
redetermination within one (1) year.

                                (v)  Within  five  (5)  business  days  from the
receipt by Tenant of a written  request from  Landlord,  Tenant shall  execute a
certificate in a form reasonably required by Landlord or a lender  acknowledging
the amount of the Initial Monthly Base Rent as so estimated by Landlord, subject
to the effect of any  redetermination  of Initial  Monthly  Base Rent  permitted
hereunder.  It is the  intention of Landlord and Tenant that any lender shall be
fully entitled to rely on the  statements set forth in such  certificate as true
and correct.  The execution of such a certificate by Tenant shall not,  however,
be a  condition  to the  obligation  of Tenant to pay  Monthly  Base Rent in the
amounts determined by Landlord nor excuse in any manner any failure by Tenant to
make payments of Monthly Base Rent as and when due.

                                (vi)  During the period  between  the First Rent
Commencement  Date and the  determination of the final Initial Monthly Base Rent
in accordance  with Section 0, Tenant shall pay Initial Monthly Base Rent at the
rate  determined  by the  estimate  of  Landlord  given in  accordance  with the
provisions of Sections 0 or, if applicable,  0. Upon the final  determination of
the Initial  Monthly  Base Rent  pursuant to Section 0,  Landlord  shall  notify
Tenant in  writing  of any amount by which the  Initial  Monthly  Base Rent then
previously paid by Tenant is more or less than that which would have been due at
the rate determined under Section 0. In the event that Tenant has paid more than
that which  would  have been due at the rate  determined  under  Section 0, then
Landlord  shall  refund the amount of the overage to Tenant  within  twenty (20)
days of the receipt by Tenant of such notice  from  Landlord.  In the event that
Tenant has paid less than that which would have been due at the rate  determined
under  Section  0,  then  Tenant  shall  pay  to  Landlord  the  amount  of  the
underpayment  within  twenty  (20) days of the  receipt by Tenant of such notice
from Landlord.

                                (vii)  Throughout  the  process  of the  design,
bidding and  construction of the Project,  Landlord shall  undertake  reasonable
efforts to keep Tenant apprised of the status of all Aggregate Development Cost.
Tenant shall be entitled to receive copies of all bid  documents,  contracts and
subcontracts  and all change orders agreed to by Landlord.  Without limiting the
foregoing,  Landlord  agrees to deliver to Tenant:  (A) a monthly  report  which
describes,  in reasonable detail, the Aggregate Development Cost paid during the
preceding   month  and  compares  such   Aggregate   Development   Cost  to  the
corresponding  amounts  set  forth  in the  Budget  and in any  budget  or other
document  used  by  the  lender  of  the  Construction  Financing  in  approving
disbursements of the proceeds of the Construction  Financing;  (B) a copy of the
summary of each request to disburse Construction  Financing proceeds to pay hard
costs  of the  Project,  together  with  copies  of  invoices  submitted  by the
architect and engineers for amounts due to such parties;  (C) written  notice as
promptly as possible after  Landlord  realizes that funds reserved in the Budget
for  contingencies  will need to be  expended  in the  future,  together  with a
reasonably detailed,  written explanation of the use thereof; and, (D) copies of
such supporting documentation to any of the foregoing as Tenant may request from
time to time.

                                                                            -33-


         20.      FIRST ADJUSTMENT TO REFLECT FINAL PHASE I PROJECT COST

                  2.01.  Determination  of Final  Phase I Project  Cost.  Within
thirty (30) days of the date upon which Landlord has the  information  necessary
to  determine  the final  Phase I Project  Cost,  but not later than one hundred
twenty (120) days  following the Last Rent  Commencement  Date,  Landlord  shall
notify Tenant in writing of the final Phase I Project Cost.  Such written notice
shall be accompanied  by a detailed  statement of final Phase I Project Cost. 


                  20.2 Possible  Review of Final Phase I Project Cost by Tenant.
Within  twenty (20) days of the  receipt by Tenant of the notice  from  Landlord
setting forth final Phase I Project Cost,  Tenant may notify Landlord in writing
(a "Review  Notice")  that  Tenant  desires to review  the  records of  Landlord
pertaining to the  determination of Phase I Project Cost. If Tenant gives such a
notice to Landlord  within such period,  Landlord  shall permit Tenant to review
all of the records of Landlord  relevant to the determination of Phase I Project
Cost.  Such review shall be performed at the offices of Landlord  during regular
business hours, and Landlord shall permit Tenant to make copies, at its expense,
of such portions of such records as Tenant may elect. Tenant shall undertake and
complete  such review  within  sixty (60) days of the receipt by Landlord of the
Review  Notice.  In the event that Tenant  concludes that the  determination  by
Landlord  of Phase I Project  Cost is  incorrect,  it shall so  notify  Landlord
within  seventy  (70) days of the receipt by Landlord of the Review  Notice from
Tenant,  which notice from Tenant shall: (i) state with  particularity the items
of Phase I Project Cost as to which Tenant  believes that the  determination  of
Landlord was incorrect; and, (ii) state the election of Tenant to have the final
Phase I Project Cost determined by arbitration in accordance with Section 0.

                  20.3.  Payment to Adjust Phase I Project Cost. The final Phase
I Project  Cost stated by Landlord in its notice to Tenant  given in  accordance
with  Section 0 shall be deemed to have been  accepted  and  approved  by Tenant
unless:  (i) Landlord and Tenant agree in writing to a different Phase I Project
Cost within  seventy  (70) days of the receipt by Landlord of the Review  Notice
from Tenant;  or, Tenant gives to Landlord within such seventy (70) day period a
notice  electing to have final Phase I Project Cost determined by arbitration in
accordance  with  Section 0. Within  thirty (30) days of the date upon which the
final Phase I Project Cost is  established  (whether by Landlord's  statement of
final  Phase I Project  Cost being  deemed  accepted  and  approved by Tenant in
accordance with this Section 0 or by a written  agreement  between  Landlord and
Tenant  establishing a different final Phase I Project Cost or by an arbitration
resulting  from an  election  by Tenant  made  within  seventy  (70) days of the
receipt by Landlord of the Review Notice from Tenant):  _.(i) if the final Phase
I  Project  Cost is less  than the Phase I  Project  Cost  used by  Landlord  in
determining  the Initial Monthly Base Rent pursuant to Section 0, Landlord shall
pay to Tenant a sum equal to the  difference  between  the Phase I Project  Cost
used by  Landlord  in  determining  the Initial  Monthly  Base Rent  pursuant to
Section 0 and the final Phase I Project Cost,  together  with, if the difference
is greater than two percent (2%) of Phase I Project Cost, an amount equal to ten
percent (10%) of the amount by which such difference exceeds two (2%) of Phase I
Project  Cost;  or, (ii) if the final Phase I Project  Cost is greater  than the
Phase I Project Cost used by Landlord in  determining  the Initial  Monthly Base
Rent  pursuant  to Section 0,  Tenant  shall pay to  Landlord a sum equal to the
difference  between the final Phase I Project  Cost and the Phase I Project Cost
used by  Landlord  in  determining  the Initial  Monthly  Base Rent  pursuant to
Section 0. Any claim by Tenant  pertaining  to a payment  due from  Landlord  to
Tenant pursuant to this Section 0 shall be subject and subordinate to the claims
and rights of any lender with respect to the  Project,  the Phase I Land and any
appurtenances  thereto,  including,  without  limitation,  the right to  receive
monthly installment payments of principal and interest. Upon the written request
of  Landlord,  Tenant  shall  execute  such  documents  as  the  lender  of  the
Construction  Financing or Take-Out  Financing may reasonably require to further
evidence or implement such subordination.

                                                                            -34-


         21.      SECOND ADJUSTMENT TO REFLECT FINAL PHASE I PROJECT COST

                  21.1.  Determination of Revised Final Phase I Project Cost. In
the event that any items of Phase I Project Cost could not have been  reasonably
ascertained with precision within ninety (90) days of the Last Rent Commencement
Date, then within one (1) year of the Last Rent Commencement Date,  Landlord may
notify Tenant in writing of a revised  final Phase I Project Cost.  Such written
notice shall be accompanied by a detailed  statement of such revised final Phase
I Project Cost.

                  21.2. Possible Review of Revised Final Phase I Project Cost by
Tenant.  Within  twenty  (20) days of the  receipt by Tenant of the notice  from
Landlord  given in  accordance  with Section 0 and setting forth a revised final
Phase I Project  Cost,  Tenant may  notify  Landlord  in writing (a  "Difference
Review Notice") that Tenant desires to review the records of Landlord pertaining
to those items (the "Difference Items") which account for the difference between
the  revised  final Phase I Project  Cost and the final Phase I Project  Cost as
determined  pursuant  to the  provisions  of Section  0. If Tenant  gives such a
notice to Landlord  within such period,  Landlord  shall permit Tenant to review
all of the records of Landlord  relevant to the determination of such Difference
Items.  Such review shall be performed at the offices of Landlord during regular
business hours, and Landlord shall permit Tenant to make copies, at its expense,
of such portions of such records as Tenant may elect. Tenant shall undertake and
complete  such review  within  sixty (60) days of the receipt by Landlord of the
Difference   Review  Notice.  In  the  event  that  Tenant  concludes  that  the
determination  by Landlord of the  Difference  Items is  incorrect,  it shall so
notify  Landlord  within  seventy  (70) days of the  receipt by  Landlord of the
Difference Review Notice from Tenant,  which notice from Tenant shall: (i) state
with  particularity  the Difference  Items as to which Tenant  believes that the
determination of Landlord was incorrect;  and, (ii) state the election of Tenant
to have the revised  final Phase I Project Cost  determined  by  arbitration  in
accordance with Section 0.

                  21.3.  Payment to Adjust  Phase I Project  Cost.  The  revised
final Phase I Project  Cost stated by Landlord in its notice to Tenant  given in
accordance  with Section 0 shall be deemed to have been accepted and approved by
Tenant unless:  (i) Landlord and Tenant agree in writing to a different  Phase I
Project  Cost  within  seventy  (70)  days of the  receipt  by  Landlord  of the
Difference  Review Notice from Tenant;  or, (ii) Tenant gives to Landlord within
such seventy (70) day period a notice electing to have the revised final Phase I
Project Cost  determined by  arbitration  in  accordance  with Section 0. Within
thirty (30) days of the date upon which the revised  final Phase I Project  Cost
is established (whether by Landlord's statement of revised final Phase I Project
Cost being  deemed  accepted  and  approved  by Tenant in  accordance  with this
Section 0 or by a written agreement  between Landlord and Tenant  establishing a
different revised final Phase I Project Cost or by an arbitration resulting from
an election by Tenant made within  seventy  (70) days of the receipt by Landlord
of the Difference Review Notice from Tenant): _.(i) if the revised final Phase I
Project  Cost is  less  than  the  final  Phase I  Project  Cost  determined  in
accordance  with  Section  0,  Landlord  shall  pay to Tenant a sum equal to the
difference  between the final Phase I Project Cost determined in accordance with
Section 0 and the revised  final Phase I Project  Cost;  or, (ii) if the revised
final Phase I Project Cost is greater  than the Phase I Project Cost  determined
in  accordance  with  Section 0, Tenant shall pay to Landlord a sum equal to the
difference  between  the  revised  final  Phase I  Project  Cost and the Phase I
Project  Cost  determined  in  accordance  with  Section  0. Any claim by Tenant
pertaining to a payment due from  Landlord to Tenant  pursuant to this Section 0
shall be subject  and  subordinate  to the claims and rights of any lender  with
respect  to the  Project,  the  Phase  I Land  and  any  appurtenances  thereto,
including, without limitation, the right to receive monthly installment payments
of principal and interest.  Upon the written  request of Landlord,  Tenant shall
execute such documents as the lender of the  Construction  Financing or Take-Out
Financing  may  reasonably   require  to  further  evidence  or  implement  such
subordination.

                                                                            -35-


         22.      PAYMENT OF PHASE II CURRENT COSTS

                  22.1.   Payment   of  Certain   Phase  II  Current   Costs  at
Acquisition. As provided in the Phase II Purchase Agreement, Tenant shall pay to
Landlord at the closing of the escrow for the  acquisition  of the Phase II Land
by Tenant from Landlord the purchase price for the Phase II Land.

                  22.2.  Payment of  Certain  Phase II  Current  Costs  Prior to
Construction  Financing. On or before the earlier of the date required by lender
of the Construction Financing or the date which is five (5) business days before
the  date on  which  Landlord,  in its  reasonable  judgment,  must  direct  the
contractor  to proceed with the  applicable  portion of the work on the Phase II
Land (of which date  Landlord  shall  notify  Tenant in writing at least two (2)
business days before such date), Tenant shall pay to Landlord an amount equal to
Landlord's  reasonable  estimate of any of the following  Phase II Current Costs
which have then been incurred (but not  necessarily  paid) by Landlord:  (i) the
actual cost to Landlord of arranging the acquisition of the City Property;  (ii)
all fees and charges of architects, engineers, materials testing consultants and
other  design or  construction  consultants,  to the  extent  that such fees and
charges relate to the design of buildings and other improvements to the Phase II
Land;  (iii) all permit fees and all fees and charges for  services  rendered by
employees of the City of San Rafael or consultants hired directly by the City of
San Rafael in connection with the application for, or issuance of, the Necessary
Approvals  required for the  construction of the improvements to be located upon
the Phase II Land;  (iv) all costs  reimbursed by Landlord to Tenant pursuant to
Section 0, to the extent that such costs pertain to  improvements  to be located
upon,  or to serve,  the Phase II Land;  (v) all  deposits  (including,  without
limitation,  deposits in  connection  with any utility  service,  but  excluding
deposits in  connection  with any Take-Out  Financing),  to the extent that such
deposits  pertain to Phase II,  provided  that the  amount of any such  deposits
returned to Landlord shall be deducted from Aggregate Development Cost and Phase
II Current  Costs when  received  (and  returned  to Tenant,  to the extent then
previously  paid by  Tenant  to  Landlord),  but only to the  extent  that  such
deposits were  previously  included in Aggregate  Development  Cost and Phase II
Current  Costs;  (vi)  premiums  for, and other costs of,  surety bonds or other
security  required in connection  with any aspect of the development of Phase II
or off-site improvements  (allocating the cost of such bonds between Phase I and
Phase II in  accordance  with the  schedule  for such  allocations  set forth in
Exhibit H, to the extent that such  security is provided by Landlord  and not by
Tenant;  and,  (vii) all  reasonable  legal  fees and  reasonable  fees of other
technical   consultants   incurred  in  connection   with  the  negotiation  and
documentation of any agreement  pertaining to the design and construction of the
improvements  to be constructed  upon the Phase II Land or any portion  thereof,
whether  at or about the same time as the Site and  Shell  Improvements  or at a
later time, or any agreement pertaining to the design,  construction or security
for of any  improvement  or payment  imposed as a condition upon any approval by
the City of San Rafael of any permit or approval required for the development of
such improvements.

                  22.3.  Payment  of  Remainder  of  Phase II  Current  Costs at
Construction  Financing. On or before the later of the day immediately preceding
the funding of the  Construction  Financing  or fifteen (15) days from a written
request by Landlord,  Tenant shall  deposit with the lender of the  Construction
Financing  an amount  equal to  Landlord's  reasonable  estimate of all Phase II
Current  Costs which have not then been paid by Tenant to  Landlord  pursuant to
Sections 0 or 0. At the  request  of Tenant,  Landlord  shall  request  that the
lender enter into an agreement with Tenant requiring that the deposit be applied
only in payment of Phase II Current Costs,  which  agreement  shall be in a form
reasonably  satisfactory to such lender.  In the event that such lender will not
enter into such an agreement,  then Tenant may, as the alternative to depositing
such funds with such lender,  elect to pay such funds to Landlord,  and Landlord
shall  enter  into  the  required  agreement  with  Tenant.   Tenant  shall  not
unreasonably  withhold or delay the 

                                                                            -36-


execution of such an agreement. Such lender may disburse such funds to pay Phase
II  Current  Costs or to  reimburse  Landlord  for any  Phase II  Current  Costs
incurred  and  paid by  Landlord.  In the  event  that  the  amount  so paid and
deposited  by Tenant is less than Phase II Current  Costs,  Landlord may request
that  Tenant  make an  additional  deposit  in an  amount  equal  to  Landlord's
reasonable  estimate of the  additional  funds  required to pay or reimburse all
Phase II Current  Costs then  unpaid  (whether  or not then yet  incurred),  and
Tenant shall make such deposit  within ten (10) days of the receipt by Tenant of
such a request  from  Landlord.  In the event  that the amount so  deposited  by
Tenant is more than  Phase II  Current  Costs,  after all such  Phase II Current
Costs have been paid or  reimbursed,  the excess  amount so  deposited  shall be
returned to Tenant by the party then holding the excess  funds.  No component of
Phase II Current  Costs so deposited or otherwise  paid or  reimbursed by Tenant
shall be included  within  Phase I Project  Cost,  to the full extent so paid or
reimbursed.


         23.  PAYMENT FOR DESIGN AND  CONSTRUCTION  OF PARKING LOT. On or before
the  later of May 1,  1998 or  fifteen  (15)  days  from a  written  request  by
Landlord,  Tenant shall deposit with the lender of the Construction Financing an
amount equal to  Landlord's  reasonable  estimate of all costs of the design and
construction  of all the  parking  lot which is to be located  upon the Phase II
Land. The obligation of Tenant to make the deposit to a lender  required by this
Section 0 may be  conditioned,  at the request of Tenant,  upon the execution by
Tenant and such  lender of an  agreement  requiring  that the deposit be applied
only in payment of the cost of the design and  construction  of all the  parking
lot which is to be located upon the Phase II Land, which agreement shall be in a
form  reasonably  satisfactory  to such lender.  Tenant  shall not  unreasonably
withhold or delay the execution of such an  agreement.  Such lender may disburse
such  funds  to pay such  costs  or to  reimburse  Landlord  for any such  costs
incurred  and paid by  Landlord.  In the event that the amount so  deposited  by
Tenant is less than the  aggregate  of such  costs of design  and  construction,
Landlord may request that Tenant make an  additional  deposit in an amount equal
to Landlord's  reasonable  estimate of the  additional  funds required to pay or
reimburse all such costs then unpaid (whether or not then yet incurred).  In the
event that the amount so deposited by Tenant is more than the  aggregate of such
costs,  after all such costs have been paid or reimbursed,  the excess amount so
deposited  shall be  returned  to Tenant by the party  then  holding  the excess
funds.  No component of such costs so deposited or otherwise  paid or reimbursed
by Tenant  shall be included  within Phase I Project Cost or in Phase II Current
Costs, to the full extent so paid or reimbursed.


         24.      ARBITRATION OF DISPUTES

         EXCEPT FOR DISPUTES  WHICH ARE TO BE DETERMINED IN ACCORDANCE  WITH THE
PROVISIONS OF SECTION 0, ANY DISPUTE  ARISING UNDER THIS LEASEHOLD  IMPROVEMENTS
AGREEMENT  SHALL BE DETERMINED BY ARBITRATION  UPON THE REQUEST OF EITHER PARTY.
THE PARTY REQUESTING  ARBITRATION SHALL DO SO BY GIVING NOTICE TO THAT EFFECT TO
THE OTHER PARTY,  SPECIFYING IN SAID NOTICE IN  REASONABLE  DETAIL THE NATURE OF
THE  DISPUTE.  WITHIN THE FIVE (5) DAY PERIOD  AFTER SUCH  NOTICE IS GIVEN,  THE
PARTIES SHALL MEET AND CONFER AS OFTEN AS IS  REASONABLY  POSSIBLE TO ATTEMPT IN
GOOD  FAITH TO AGREE ON A SINGLE  ARBITRATOR  TO  RESOLVE  THE  DISPUTE.  IF THE
PARTIES  FAIL TO SO AGREE  WITHIN THAT FIVE (5) DAY PERIOD,  THE MATTER SHALL BE
REFERRED TO THE AMERICAN  ARBITRATION  ASSOCIATION,  WHICH SHALL SELECT A SINGLE
ARBITRATOR TO RESOLVE SUCH DISPUTE. WITHIN FIVE (5) DAYS AFTER THE ARBITRATOR IS
SELECTED,  THE  ARBITRATOR  SHALL NOTIFY EACH OF THE PARTIES OF THE LOCATION AND
TIME OF A HEARING OF THEIR  RESPECTIVE  POSITIONS  WITH  RESPECT TO THE DISPUTE,

                                                                            -37-


WHICH SHALL BE HELD NOT LATER THAN  FIFTEEN  (15) DAYS AFTER THE NOTICE FROM THE
PARTY  INITIATING  THE  ARBITRATION.  THE  ARBITRATOR  SHALL  RENDER  HIS OR HER
DECISION WITHIN SEVEN (7) DAYS OF CONCLUSION OF THE HEARING. THE DECISION OF THE
ARBITRATOR  SHALL BE BINDING AND CONCLUSIVE  UPON THE PARTIES.  IF AN ARBITRATOR
SHALL FAIL OR REFUSE TO ACT  WITHIN THE TIME  PERIODS  PROVIDED  HEREIN,  THEN A
SUBSTITUTE ARBITRATOR SHALL BE APPOINTED UPON THE APPLICATION OF EITHER PARTY BY
THE PRESIDING JUDGE OF THE SUPERIOR COURT IN AND FOR THE COUNTY OF MARIN, ACTING
IN HIS OR HER  PERSONAL,  RATHER  THAN  JUDICIAL,  CAPACITY.  THE  AWARD IN SUCH
ARBITRATION MAY BE ENFORCED,  ON THE APPLICATION OF EITHER PARTY THERETO, BY THE
ORDER OR JUDGMENT OF A COURT OF COMPETENT JURISDICTION. THE FEES AND EXPENSES OF
THE ARBITRATOR SHALL BE BORNE BY THE PARTIES EQUALLY,  BUT EACH PARTY SHALL BEAR
THE EXPENSE OF ITS OWN  ATTORNEYS  AND EXPERTS  AND THE  ADDITIONAL  EXPENSES OF
PRESENTING ITS OWN PROOF.

         NOTICE: BY INITIALLING IN THE SPACE BELOW, YOU ARE AGREEING TO HAVE ANY
         DISPUTE  ARISING OUT OF THE MATTERS  INCLUDED  IN THE  "ARBITRATION  OF
         DISPUTES"  PROVISION  DECIDED BY NEUTRAL  ARBITRATION  AS  PROVIDED  BY
         CALIFORNIA  LAW AND YOU ARE GIVING UP ANY  RIGHTS YOU MIGHT  POSSESS TO
         HAVE THE DISPUTE  LITIGATED IN A COURT OR JURY TRIAL. BY INITIALLING IN
         THE SPACE BELOW,  YOU ARE GIVING UP YOUR  JUDICIAL  RIGHTS TO DISCOVERY
         AND  APPEAL,  UNLESS  THOSE  RIGHTS ARE  SPECIFICALLY  INCLUDED  IN THE
         "ARBITRATION  OF  DISPUTES"  PROVISION.  IF YOU  REFUSE  TO  SUBMIT  TO
         ARBITRATION  AFTER AGREEING TO THIS PROVISION,  YOU MAY BE COMPELLED TO
         ARBITRATE   UNDER  THE  AUTHORITY  OF  THE  CALIFORNIA  CODE  OF  CIVIL
         PROCEDURE. YOUR AGREEMENT TO THIS ARBITRATION PROVISION IS VOLUNTARY.

         WE HAVE READ AND UNDERSTAND THE FOREGOING AND AGREE TO SUBMIT  DISPUTES
         ARISING OUT OF THE MATTERS  INCLUDED IN THE  "ARBITRATION  OF DISPUTES"
         PROVISION TO NEUTRAL ARBITRATION.

                               LANDLORD

                               Village Builders, L.P.,
                               a California limited partnership

                                      By:   VPI, Inc., a California corporation,
                                                   Its General Partner



                                      By:
                                            ------------------------------------
                                      Its:
                                            ------------------------------------

                                                                            -38-


                               TENANT

                               Fair, Isaac and Company, Inc.,
                               a Delaware corporation


                               By:
                                    --------------------------------------------

                               Its:
                                    --------------------------------------------


         25.      ALTERNATIVE PROCEDURE FOR ARBITRATION OF CERTAIN DISPUTES.

         ANY DISPUTE  ARISING UNDER A PROVISION OF THIS  LEASEHOLD  IMPROVEMENTS
AGREEMENT  WHICH  SPECIFICALLY  STATES THAT SUCH DISPUTES SHALL BE DETERMINED BY
ARBITRATION  IN  ACCORDANCE  WITH  THIS  SECTION  0 SHALL BE  DETERMINED  BY THE
FOLLOWING  PROCEDURES.  THE PARTY REQUESTING  ARBITRATION  SHALL DO SO BY GIVING
NOTICE  TO  THAT  EFFECT  TO THE  OTHER  PARTY,  SPECIFYING  IN SAID  NOTICE  IN
REASONABLE DETAIL THE NATURE OF THE DISPUTE. WITHIN THE TWO (2) DAY PERIOD AFTER
SUCH  NOTICE  IS  GIVEN,  THE  PARTIES  SHALL  MEET  AND  CONFER  AS OFTEN AS IS
REASONABLY  POSSIBLE TO ATTEMPT IN GOOD FAITH TO AGREE ON A SINGLE ARBITRATOR TO
RESOLVE THE  DISPUTE.  IF THE PARTIES  FAIL TO SO AGREE  WITHIN THAT TWO (2) DAY
PERIOD, THEN BY 5:00 P.M. ON SUCH SECOND DAY, EACH PARTY SHALL LIST THE NAMES OF
TWO (2)  ARBITRATORS ON A PIECE OF PAPER AND SHALL PROVIDE A COPY THEREOF TO THE
OTHER PARTY. IF THE NAME OF AN ARBITRATOR  APPEARS ON BOTH PIECES OF PAPER, SUCH
PERSON  SHALL  ARBITRATE  THE  DISPUTE.  OTHERWISE,  THE  NAMES  OF THE FOUR (4)
ARBITRATORS  SHALL  BE  SUBMITTED  ON THE  FOLLOWING  MORNING  TO  THE  AMERICAN
ARBITRATION  ASSOCIATION SOLELY FOR THE PURPOSE OF SELECTING WHICH OF THOSE FOUR
(4)  INDIVIDUALS   SHALL  ARBITRATE  THE  DISPUTE.   THE  AMERICAN   ARBITRATION
ASSOCIATION SHALL BE REQUESTED TO SELECT SUCH AN ARBITRATOR WITHIN TWO (2) DAYS.
WITHIN FIVE (5) DAYS OF THE SELECTION OF THE  ARBITRATOR,  THE ARBITRATOR  SHALL
NOTIFY  EACH OF THE  PARTIES  OF THE  LOCATION  AND TIME OF A  HEARING  OF THEIR
RESPECTIVE POSITIONS WITH RESPECT TO THE DISPUTE,  WHICH SHALL BE HELD NOT LATER
THAN TEN (10) DAYS AFTER THE NOTICE FROM THE PARTY  INITIATING THE  ARBITRATION.
THE ARBITRATOR  SHALL RENDER HIS OR HER DECISION WITHIN TWO (2) BUSINESS DAYS OF
CONCLUSION OF THE HEARING.  THE DECISION OF THE ARBITRATOR  SHALL BE BINDING AND
CONCLUSIVE UPON THE PARTIES. IF AN ARBITRATOR SHALL FAIL OR REFUSE TO ACT WITHIN
THE  TIME  PERIODS  PROVIDED  HEREIN,  THEN A  SUBSTITUTE  ARBITRATOR  SHALL  BE
APPOINTED  UPON THE  APPLICATION  OF EITHER PARTY BY THE PRESIDING  JUDGE OF THE
SUPERIOR  COURT IN AND FOR THE COUNTY OF MARIN,  ACTING IN HIS OR HER  PERSONAL,
RATHER THAN JUDICIAL,  CAPACITY.  THE AWARD IN SUCH ARBITRATION MAY BE ENFORCED,
ON THE APPLICATION OF EITHER PARTY THERETO,  BY THE ORDER OR JUDGMENT OF A COURT
OF  COMPETENT  JURISDICTION.  THE FEES AND EXPENSES OF THE  ARBITRATOR  SHALL BE
BORNE BY THE PARTIES  EQUALLY,  BUT EACH PARTY SHALL BEAR THE EXPENSE OF ITS OWN
ATTORNEYS AND EXPERTS AND THE ADDITIONAL EXPENSES OF PRESENTING ITS OWN PROOF.

         NOTICE: BY INITIALLING IN THE SPACE BELOW, YOU ARE AGREEING

                                                                            -39-


         TO  HAVE  ANY  DISPUTE  ARISING  OUT OF  THE  MATTERS  INCLUDED  IN THE
         "ARBITRATION OF DISPUTES"  PROVISION DECIDED BY NEUTRAL  ARBITRATION AS
         PROVIDED BY  CALIFORNIA  LAW AND YOU ARE GIVING UP ANY RIGHTS YOU MIGHT
         POSSESS TO HAVE THE  DISPUTE  LITIGATED  IN A COURT OR JURY  TRIAL.  BY
         INITIALLING IN THE SPACE BELOW,  YOU ARE GIVING UP YOUR JUDICIAL RIGHTS
         TO DISCOVERY AND APPEAL,  UNLESS THOSE RIGHTS ARE SPECIFICALLY INCLUDED
         IN THE "ARBITRATION OF DISPUTES" PROVISION.  IF YOU REFUSE TO SUBMIT TO
         ARBITRATION  AFTER AGREEING TO THIS PROVISION,  YOU MAY BE COMPELLED TO
         ARBITRATE   UNDER  THE  AUTHORITY  OF  THE  CALIFORNIA  CODE  OF  CIVIL
         PROCEDURE. YOUR AGREEMENT TO THIS ARBITRATION PROVISION IS VOLUNTARY.

         WE HAVE READ AND UNDERSTAND THE FOREGOING AND AGREE TO SUBMIT  DISPUTES
         ARISING OUT OF THE MATTERS  INCLUDED IN THE  "ARBITRATION  OF DISPUTES"
         PROVISION TO NEUTRAL ARBITRATION.

                               LANDLORD

                               Village Builders, L.P.,
                               a California limited partnership

                               By:   VPI, Inc., a California corporation,
                                           Its General Partner



                                  By:
                                     -------------------------------------------
                                  Its:
                                     -------------------------------------------


                               TENANT

                               Fair, Isaac and Company, Inc.,
                               a Delaware corporation


                               By:
                                    --------------------------------------------

                               Its:
                                    --------------------------------------------


         26. NOTICES.  Except as otherwise  expressly provided in this Leasehold
Improvements Agreement, any bills,  statements,  notices,  demands,  requests or
other  communications  given  or  required  to be  given  under  this  Leasehold
Improvements  Agreement shall be effective only if rendered or given in writing,
sent by certified mail (return receipt requested),  reputable overnight carrier,
or  delivered  personally,  (i) to Tenant at  Tenant's  address set forth in the
Basic Lease Information of the Lease, or (ii) to Landlord at Landlord's  address
set forth in the Basic Lease  Information  of the Lease;  or (iii) to such other
address as either  Landlord or Tenant may  designate as its new address for such
purpose by notice given to the other in accordance  with the  provisions of this
Section 0. Any bill, statement,  notice,  demand, request or other communication

                                                                            -40-


shall be deemed to have been  rendered  or given on the date the return  receipt
indicates  delivery of or refusal of delivery if sent by certified mail, the day
upon which recipient  accepts and signs for delivery from a reputable  overnight
carrier  or on the date a  reputable  overnight  carrier  indicates  refusal  of
delivery,  upon the date  personal  delivery  is made,  or three (3) days  after
mailed by first class U.S. mail. Any bill, statement, notice, demand, request or
other communication under this Leasehold  Improvements Agreement may be given on
behalf of a party by the attorney for such party.


         27.  EFFECT  OF  EXERCISE  OF  OPTION.  The  other  provisions  of this
Leasehold  Improvements  Agreement  notwithstanding,  in the event  that  Tenant
exercises the "First  Option" (as that term is defined in the Option  Agreement)
in accordance with the provisions of the Option Agreement, Landlord shall assign
to Tenant the agreements required to be so assigned by the Option Agreement, and
Landlord may thereafter cease to perform any obligation of Landlord  pursuant to
this   Leasehold   Improvements   Agreement  with  respect  to  the  design  and
construction of any  improvements on the Phase I Land or the Phase II Land other
than any obligations of Landlord with respect to obtaining Necessary Approvals.


         28.      ASSIGNMENT.

                  28.1. By Tenant.  The rights of Tenant  hereunder shall not be
assigned by Tenant  except in  connection  with an  assignment  of the leasehold
interest of Tenant  under the Lease,  but only if such  assignment  is permitted
under the Lease or is made with the consent of Landlord, and any other purported
assignment by Tenant shall be null and void and of no force or effect.

                  28.2. By Landlord.  This Leasehold  Improvements Agreement and
the rights of Landlord (but not the obligations of Landlord)  hereunder shall be
assignable as collateral by Landlord without Tenant's consent or approval to any
lender of Construction  Financing or Take-Out Financing,  to constituent partner
in Landlord (or constituent partner of a constituent partner in Landlord), to an
entity in which Jim  Helfrich or Scott  Kepner hold  equity  interests  (or to a
constituent partner of such entity),  but any such assignment shall only be made
in connection with an assignment of the right of Landlord under the Lease.


         29. CONFLICTS AND CONFORMITY WITH OTHER DOCUMENTS.  To the extent which
this  Leasehold   Improvements   Agreement  fails  to  provide  the  rights  and
obligations  of  Landlord  and Tenant  relative  to any  matter,  the rights and
obligations  of each of them  relative to such  matter  shall be governed by the
Lease to the extent such matters are addressed in the Lease.


         30.      DESIGNATION OF AGENTS.

                  30.1.  Designation  of  Agent  by  Landlord.  Landlord  hereby
appoints as its respective  agents in connection with the matters referred to in
this Leasehold Improvements  Agreement Scott Kepner and Jim Helfrich,  with each
such agent  being  fully  authorized  to act for and bind  Landlord  without the
necessity  of  confirmation  or  ratification  by any other such agent or by any
other person or entity.  Such  appointment  shall be for the express  benefit of
Tenant.

                  30.2.  Designation of Agent by Tenant.  Tenant hereby appoints
as its  respective  agents in  connection  with the matters  referred to in this
Leasehold Improvements Agreement Stephen Gale and Michael Gordon, with each such
agent being fully authorized to act for and bind Tenant without the necessity of
confirmation  or  ratification by any other such agent or 

                                                                            -41-


by any other person or entity. Such appointment shall be for the express benefit
of Landlord.


         31.      EVENTS OF DEFAULT.

                  31.1.  Events of  Landlord  Default.  An  "Event  of  Landlord
Default"  shall be deemed to have  occurred  when:  (i)  Landlord  has failed to
perform any of its  obligations  or has  breached  any of its duties  under this
Leasehold Improvements  Agreement;  (ii) Tenant has given written notice of such
failure or breach to Landlord; and, (iii) Landlord has not cured such failure or
breach,  with  respect to any failure to pay or deposit  money,  within five (5)
business  days of the  receipt by  Landlord  of such notice from Tenant or, with
respect to any failure to perform any  obligation  or breach of any duty,  other
than an  obligation  to pay or deposit  money,  within thirty (30) days from the
receipt by Landlord of such  notice from Tenant or, if Landlord  has  diligently
commenced  and  endeavored  to cure such  failure or breach but such  failure or
breach  cannot by its nature be cured  within  such  period of thirty  (30) days
despite the diligent efforts of Landlord,  then within such additional period as
may  reasonably be required for the completion of such cure through the diligent
efforts of Landlord;  provided,  however,  that such additional period shall not
exceed  ninety (90) days beyond  such  thirty  (30) day  period.  The  foregoing
notwithstanding,  in the event that Tenant is  prevented or delayed by operation
of law or by injunction  from giving to Landlord notice that Landlord has failed
to perform any of its  obligations  or has breached  any of its duties,  then no
such  notice  shall be  required,  and an "Event of Landlord  Default"  shall be
deemed to have occurred when the  applicable  time period  referred to in clause
(iii) above has elapsed from the first occurrence of such failure of performance
or breach of duty  (rather  than from the  receipt by  Landlord of a notice from
Tenant).

                  31.2.  Events of Tenant Default.  An "Event of Tenant Default"
shall be deemed to have occurred  when:  (i) Tenant has failed to perform any of
its obligations or breached any of its duties under this Leasehold  Improvements
Agreement;  (ii) Landlord has given written  notice of such failure or breach to
Tenant;  and, (iii) Tenant has not cured such failure or breach, with respect to
any  failure to pay or  deposit  money,  within  five (5)  business  days of the
receipt by Tenant of such notice from  Landlord  or, with respect to any failure
to perform any obligation or breach of any duty, other than an obligation to pay
or deposit  money,  within  thirty  (30) days from the receipt by Tenant of such
notice from Landlord or, if Tenant has  diligently  commenced and  endeavored to
cure such  failure  or breach  but such  failure  cannot by its  nature be cured
within such period of thirty (30) days despite the  diligent  efforts of Tenant,
then  within  such  additional  period as may  reasonably  be  required  for the
completion  of such cure  through  the  diligent  efforts of  Tenant;  provided,
however,  that such  additional  period shall not exceed ninety (90) days beyond
such thirty (30) day period.  The foregoing  notwithstanding,  in the event that
Landlord is  prevented  or delayed by  operation  of law or by  injunction  from
giving to Tenant notice that Tenant has failed to perform any of its obligations
or has breached any of its duties, then no such notice shall be required, and an
"Event of Tenant  Default"  shall be deemed to have occurred when the applicable
time  period  referred  to in  clause  (iii)  above has  elapsed  from the first
occurrence  of such failure of  performance  or breach of duty (rather than from
the receipt by Tenant of a notice from Landlord).


         32. WAIVER.  If either Landlord or Tenant waives the performance of any
term, covenant or condition contained in this Leasehold Improvements  Agreement,
such waiver shall not be deemed to be a waiver of any  subsequent  breach of the
same or any other term, covenant or condition contained herein. Furthermore, the
acceptance  of  Monthly  Base  Rent or  Additional  Rent by  Landlord  shall not
constitute a waiver of any preceding  breach by Tenant of any term,  covenant or
condition  of this  Leasehold  Improvements  Agreement  or of any Tenant  Caused
Delay,  regardless of Landlord's  knowledge of such preceding breach at the time
Landlord accepted such Monthly Base Rent or Additional Rent. Failure by Landlord
or Tenant to enforce any of the terms, 

                                                                            -42-


covenants or conditions of this Leasehold  Improvements Agreement for any length
of time shall not be deemed to waive or to  decrease  the right of  Landlord  or
Tenant to  insist  thereafter  upon  strict  performance  by  Tenant.  Waiver by
Landlord  or  Tenant  of any  term,  covenant  or  condition  contained  in this
Leasehold  Improvements  Agreement may only be made by a written document signed
by the party to be charged with such waiver.


         33.  ATTORNEYS'  FEES. If Tenant or Landlord  brings any arbitration or
action for any relief against the other,  declaratory or otherwise,  arising out
of this  Leasehold  Improvements  Agreement,  the losing  party shall pay to the
prevailing  party a reasonable sum for attorneys' fees, which shall be deemed to
have accrued on the commencement of such action and shall be paid whether or not
the arbitration or action is prosecuted to judgment.


         34.      TERMINATION.

                  34.1.  Rights of  Landlord  to  Terminate.  In addition to any
other  rights to  terminate  this  Leasehold  Improvements  Agreement  set forth
herein,  but subject to the  provisions of Section 0.D,  Landlord shall have the
following rights:

                         A. In the  event  that  Landlord  is  unable  to obtain
Construction  Financing or Take-Out  Financing  (on the terms  described in this
Leasehold Improvements Agreement and otherwise on terms which, if less favorable
to  Landlord,  shall be  satisfactory  to Landlord  in the  exercise of its sole
discretion) in sufficient time to permit the  Commencement  of Construction  for
the  Project  on or  before  June 1,  1998,  after  Landlord  has  followed  the
procedures  set forth in this  Leasehold  Improvements  Agreement to obtain such
financing,  Landlord  may  terminate  the  Lease,  this  Leasehold  Improvements
Agreement,  the Option  Agreement and the Phase II Purchase  Agreement  (but not
less than all of them) by written  notice to Tenant on or after June 2, 1998. In
addition,  if Landlord is unable to obtain binding  commitments for Construction
Financing  or  Take-Out  Financing  (on the  terms  described  in the  Leasehold
Improvements  Agreement  and  otherwise  on terms  which,  if less  favorable to
Landlord,  shall  be  satisfactory  to  Landlord  in the  exercise  of its  sole
discretion)  on or before  April 15,  1998,  after  Landlord  has  followed  the
procedures  set forth in the  Leasehold  Improvements  Agreement  to obtain such
commitments,  Landlord may  terminate  the Lease,  this  Leasehold  Improvements
Agreement,  the Option  Agreement and the Phase II Purchase  Agreement  (but not
less than all of them) by written notice to Tenant on or after April 16, 1998.

                         B. In the event that the City of San  Rafael  imposes a
condition  upon  the  issuance  of any  permit  or  approval  necessary  for the
development  of  the  Project  (including,  without  limitation,  a  development
agreement for the Project and the Phase II Land) which  Landlord  concludes,  in
the exercise of its reasonable  judgment,  would materially  impair the value or
usability  of the Project or which  would  cause Phase I Project  Cost to exceed
Estimated  Phase I Project Cost or which would impose upon Landlord  costs which
are not Phase I Project  Costs and which are  materially  in excess of the costs
projected  by  Landlord  for  those  purposes,  or in the  event  that  Landlord
reasonably  believes that the City of San Rafael is likely to impose one or more
such conditions in the future,  Landlord may terminate the Lease, this Leasehold
Improvements Agreement, the Option Agreement and the Phase II Purchase Agreement
(but not less than all of them) by written  notice to Tenant.  Landlord may also
terminate the Lease, this Leasehold Improvements Agreement, the Option Agreement
and the Phase II Purchase  Agreement  (but not less than all of them) by written
notice  to Tenant if  Landlord  reasonably  concludes  that no  solution  to the
relocation of the existing  115KV  powerline will be approved by the City of San
Rafael  which is  acceptable  to Tenant and, in the sole  judgment of  Landlord,
economically feasible in the circumstances.

                                                                            -43-


                         C. In the  event  that the City of San  Rafael  for any
reason  fails or  refuses  to grant on or  before  May 1, 1998 all  permits  and
approvals  necessary to permit the  development  of the Project and the Phase II
Land with not less than three hundred fifty  thousand  (350,000)  square feet of
Gross Building Area and otherwise in accordance  with the terms of the Lease and
this  Leasehold  Improvements  Agreement  (including,   without  limitation,   a
development  agreement  for the  Project  and the Phase II Land),  Landlord  may
terminate the Lease, this Leasehold Improvements Agreement, the Option Agreement
and the Phase II Purchase  Agreement  (but not less than all of them) by written
notice to Tenant on or after May 2, 1998.

                         D.  Notwithstanding  the  foregoing  provisions of this
Section 0 to the contrary, if Tenant exercises the First Option under the Option
Agreement  prior to Landlord's  exercise of any right under this Section 0, then
the following  provisions  shall apply:  (i) with respect to  Landlord's  rights
under  Sections  0.A and 0.B,  Landlord's  rights under such  Sections  shall be
suspended  until the earlier to occur of: (a) the date on which Tenant  acquires
the PG&E Property pursuant to the First Option (in which event Landlord's rights
under such Sections  shall  automatically  terminate);  or (b) the date on which
Tenant fails, for any reason, to acquire the PG&E Property pursuant to the First
Option (in which event, with respect to Section 0.A only, the dates set forth in
Section 0.A shall be deemed to be the same dates in 1999); and (ii) with respect
to  Landlord's  right under Section 0.C, if on or before May 1, 1998 both Tenant
has not acquired the PG&E Property  pursuant to the First Option and the permits
and approvals  described in Section 0.C have not been granted by the City of San
Rafael,  then Landlord may elect to deliver to Tenant  written  notice  advising
Tenant that it must  either  acquire  title to the PG&E  Property in its "as is"
condition on or before a date  specified  by Landlord in its notice  (which date
shall not be less than fifteen (15) days after the date of Landlord's notice) or
permitting  Landlord  to  terminate  the  Lease,  this  Leasehold   Improvements
Agreement,  the Option  Agreement and the Phase II Purchase  Agreement  (but not
less than all of them) effective as of the date which is five (5) days after the
date of  Landlord's  notice.  With respect to clause (ii) above only,  if Tenant
fails to deliver to Landlord,  within that five (5) day period,  written  notice
agreeing  to so  acquire  title  to the PG&E  Property,  then  the  Lease,  this
Leasehold Improvements Agreement, the Option Agreement and the Phase II Purchase
Agreement (but not less than all of them) shall so terminate.

                  34.2.  Termination of Multiple Agreements.  In those instances
where either Landlord or Tenant or both of them are given the right to terminate
more than one agreement between them by reason of the occurrence of a particular
event or  circumstance,  it is the  intention  of  Landlord  and Tenant that any
termination  resulting  from the  exercise  of such right shall be of all of the
agreements as to which the right is so given and all rights arising  thereunder,
but not less than all of them,  except that  termination of the Option Agreement
shall not ipso facto  terminate  the Lease  under this  Section 0. If the Lease,
this Leasehold  Improvements  Agreement,  the Option  Agreement and the Phase II
Purchase  Agreement are terminated  for any reason,  that  termination  shall be
without  prejudice  to any rights  either  party may have against the other with
respect to sums which became due under the Lease,  this  Leasehold  Improvements
Agreement, the Option Agreement or the Phase II Purchase Agreement prior to such
termination.   The  provisions  of  this  Section  0  shall  apply  to  all  the
aforementioned documents notwithstanding any provision to the contrary in them.

                  34.3.  Effect of Termination  of the Lease.  In the event that
the  Lease is  terminated  for any  reason,  then  this  Leasehold  Improvements
Agreement shall also be deemed to have simultaneously  been terminated,  without
further  act of the  parties.  In the event of the  termination  of the Lease by
reason  of a default  by Tenant  thereunder,  then this  Leasehold  Improvements
Agreement  shall  conclusively  be deemed also to have been  terminated due to a
default by Tenant.

                                                                            -44-


         35.  PAYMENTS BY LANDLORD.  Provisions of this  Leasehold  Improvements
Agreement  which  require  that  Landlord pay an expense or provide a service or
thing at its expense are not  intended to affect,  or to exclude  such  expenses
from,  the  definition  of "Aggregate  Development  Cost" set forth in the Lease
(upon which Monthly Base Rent is to be based,  as therein  provided) or to imply
that Landlord is not entitled to obtain  reimbursement  for such expenses to the
extent provided herein or in the Lease.


         36.  INTEREST ON DEPOSITS OR PAYMENTS BY LANDLORD.  In instances  where
Tenant is required  to pay a deposit or other sum to  Landlord  pursuant to this
Leasehold Improvements  Agreement,  if Landlord does not intend to promptly make
the  expenditure to which the payment  related and is permitted by the lender of
the  Construction  Financing  to invest the funds so paid by Tenant at interest,
Landlord shall so invest the funds at rates then applicable to insured accounts,
and shall pay to Tenant  the  interest  earned  thereon  when such  interest  is
received by Landlord.  In instances where Tenant is required to pay a deposit or
other sum to the lender of the Construction Financing pursuant to this Leasehold
Improvements  Agreement,  Landlord  shall use  reasonable  efforts to cause such
lender to deposit  such sum in an  interest-bearing  account  with all  interest
earned thereon to be paid to Tenant when received.


         37.  MISCELLANEOUS  MATTERS.  Time is of the essence of this  Leasehold
Improvements  Agreement and all of its provisions.  This Leasehold  Improvements
Agreement  shall  in all  respects  be  governed  by the  laws of the  State  of
California.  This Leasehold Improvements Agreement,  together with its exhibits,
contains all the  agreements  of the parties  hereto  pertaining  to the subject
matter of this  Leasehold  Improvements  Agreement,  and supersedes any previous
negotiations  regarding that subject matter.  There have been no representations
made by Landlord or understandings made between the parties other than those set
forth in this Leasehold Improvements Agreement and its exhibits.  This Leasehold
Improvements  Agreement may be executed in counterparts,  each of which shall be
deemed an original.  This Leasehold  Improvements  Agreement may not be modified
except by a written  instrument  by the parties  hereto.  The  Section  headings
herein are for  convenience  of reference and shall in no way define,  increase,
limit or  describe  the  scope or  intent  of any  provision  of this  Leasehold
Improvements Agreement.


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

                                 LANDLORD

                                 Village Builders, L.P.,
                                 a California limited partnership

                                      By:   VPI, Inc., a California corporation,
                                              Its General Partner



                                 By:
                                     -------------------------------------------
                                 Its:
                                     -------------------------------------------

                                 TENANT

                                                                            -45-


                                 Fair, Isaac and Company, Inc.,
                                 a Delaware corporation


                                 By:
                                    --------------------------------------------
               
                                 Its:
                                    --------------------------------------------

                                                                            -46-



                                TABLE OF CONTENTS


                                                                                                                Page
                                                                                                                ----
                                                                                                           
1.       DEFINITIONS..............................................................................................1
         1.1.     "Agreed Spread for Take-Out Financing"..........................................................2
         1.2.     "Agreed Take-Out Financing Closing Costs".......................................................2
         1.3.     "Aggregate Development Cost"....................................................................2
         1.4.     "Base Building Improvements"....................................................................6
         1.5.     "Budget"........................................................................................6
         1.6.     "Commencement of Construction"..................................................................6
         1.7.     "Common Area"...................................................................................6
         1.8.     "Conceptual Plans for the Tenant Improvements"..................................................6
         1.9.     "Construction Financing"........................................................................6
         1.10.    "Construction Period"...........................................................................7
         1.11.    "Criteria for Take-Out Financing"...............................................................7
         1.12.    "Defect List"...................................................................................8
         1.13.    "Delays"........................................................................................8
         1.14.    "Designated Treasury Rate"......................................................................8
         1.15.    "Development Constant"..........................................................................8
         1.16.    "Descriptive Base Specifications"...............................................................8
         1.17.    "Draft Working Drawings for the Tenant Improvements"............................................8
         1.18.    "Estimated Phase I Project Cost"................................................................8
         1.19.    "Event of Default"..............................................................................8
         1.20.    "Event of Landlord Default".....................................................................8
         1.21.    "Event of Tenant Default".......................................................................8
         1.22.    "Final Working Drawings for the Tenant Improvements"............................................8
         1.23.    "Floor".........................................................................................9
         1.24.    "Floor Substantial Completion Notice"...........................................................9
         1.25.    "Force Majeure Events"..........................................................................9
         1.26.    "Gross Building Area"...........................................................................9
         1.27.    "Hazardous Materials"...........................................................................9
         1.28.    "HVAC Defect List"..............................................................................9
         1.29.    "Laws"..........................................................................................9
         1.30.    "Modifications".................................................................................9
         1.31.    "Mortgage"......................................................................................9
         1.32.    "Necessary Approvals"......................................................................... 10
         1.33.    "Necessary Changes"........................................................................... 10
         1.34.    "Net Stipulated Value of the PG&E Property"................................................... 10
         1.35.    "Option Agreement"............................................................................ 10
         1.36.    "Parking Easement"............................................................................ 10
         1.37.    "Parking Easement Agreement".................................................................. 10
         1.38.    "Parking Easement Area"....................................................................... 10
         1.39.    "PG&E" ....................................................................................... 10
         1.40.    "PG&E Environmental Agreement" ............................................................... 10
         1.41.    "PG&E Property"............................................................................... 10
         1.42.    "Phase I"..................................................................................... 10
         1.43.    "Phase I Buildings"........................................................................... 10
         1.44.    "Phase I Land"................................................................................ 11
         1.45.    "Phase I Project Cost"........................................................................ 11
         1.46.    "Phase II".................................................................................... 11
         1.47.    "Phase II Current Costs"...................................................................... 11
         1.48.    "Phase II Land"............................................................................... 13

                                                                             -i-


         1.49.    "Phase II Purchase Agreement" ................................................................ 13
         1.50.    "Premises".................................................................................... 13
         1.51.    "Project"..................................................................................... 13
         1.52.    "Project Substantial Completion Notice"....................................................... 13
         1.53.    "Punch List".................................................................................. 13
         1.54.    "Real Estate Taxes"........................................................................... 13
         1.55.    "Rentable Area"............................................................................... 13
         1.56.    "Review Notice"............................................................................... 13
         1.57.    "Site Improvements"........................................................................... 13
         1.58.    "Site and Shell Improvements"................................................................. 13
         1.59.    "Substantial Completion"...................................................................... 13
         1.60.    "Substantial Completion Notice"............................................................... 14
         1.61.    "Take-Out Financing".......................................................................... 14
         1.62.    "Tenant Caused Delays"........................................................................ 14
         1.63.    "Tenant Improvements"......................................................................... 14
         1.64.    "Tenant Improvement Allowance"................................................................ 15
         1.65.    "Tentative Site Plan"......................................................................... 15
         1.66.    "Work"........................................................................................ 15
         1.67.    "Working Drawings for the Site and Shell Improvements"........................................ 15

2.       GENERAL DESCRIPTION OF THE IMPROVEMENTS TO BE DESIGNED AND CONSTRUCTED BY LANDLORD..................... 15
         2.1.     General Description of Site Improvements...................................................... 15
         2.2.     General Description of Base Building Improvements............................................. 16
         2.3.     General Description of Tenant Improvements.................................................... 17
         2.4.     Design of Site and Shell Improvements......................................................... 17

3.       PREPARATION AND APPROVAL OF APPLICATIONS TO THE CITY OF SAN RAFAEL..................................... 18
         3.1.     Applications.................................................................................. 18
         3.2.     Changes in Plans and Specifications........................................................... 18
         3.3.     Consistency with Descriptive Base Specifications.............................................. 19
         3.4.     Fees and Expenses Incurred in Connection with the Applications................................ 19
         3.5.     Letter  Agreements  Pertaining to Certain Fees and Expenses  Incurred in Connection with
                  the Applications.............................................................................. 19

4.       COOPERATION IN PLANNING PROCESS........................................................................ 20

5.       PREPARATION OF PLANS AND SPECIFICATIONS FOR OFF-SITE IMPROVEMENTS...................................... 20

6.       PREPARATION OF WORKING DRAWINGS FOR THE SITE AND SHELL IMPROVEMENTS.................................... 20
         6.1.     Initial Preparation........................................................................... 20
         6.2.     Submission to Tenant for Review............................................................... 21
         6.3.     Tenant's Review Responsibilities.............................................................. 21
         6.4.     Submission to the City of San Rafael.......................................................... 21

7.       TENANT'S ARCHITECT AND ENGINEERS....................................................................... 22
         7.1.     Submission of List of Consultants............................................................. 22
         7.2.     Cost of Preparation........................................................................... 22

8.       SUBMITTAL OF CONCEPTUAL PLANS FOR THE TENANT IMPROVEMENTS.............................................. 22

                                                                            -ii-


         8.1.     Preliminary Submission........................................................................ 22
         8.2.     First Submission.............................................................................. 22
         8.3.     Purpose of Conceptual Plans for the Tenant Improvements....................................... 23

9.       PREPARATION OF WORKING DRAWINGS FOR THE TENANT IMPROVEMENTS............................................ 23

10.      LANDLORD'S REVIEW RESPONSIBILITIES..................................................................... 24

11.      COST OF TENANT IMPROVEMENTS............................................................................ 25

12.      CONSTRUCTION OF SITE AND SHELL IMPROVEMENTS............................................................ 25
         12.1.    Construction and Substitutions................................................................ 25
         12.2.    Changes to Working Drawings for the Site and Shell Improvements............................... 26

13.      INSPECTION BY TENANT................................................................................... 26

14.      CHANGE ORDERS.......................................................................................... 27
         14.1.    Right of Tenant to Request Modifications...................................................... 27
         14.2.    Preparation of Plans for Modifications........................................................ 27

15.      CONSTRUCTION RELATED MATTERS........................................................................... 28
         15.1.    Target Date For Commencement.................................................................. 28
         15.2.    Schedule Requirements in Construction Contracts............................................... 28
         15.3.    Notice of Substantial Completion.............................................................. 29

16.      NOTICES OF COMPLETION AND DEFECTS...................................................................... 29
         16.1.    Project Substantial Completion Notice and Acceptance.......................................... 29
         16.2.    Assignment of Warranty Rights by Landlord..................................................... 30
         16.3.    Corrections by Landlord....................................................................... 30

17.      DELAYS................................................................................................. 30
         17.1.    Tenant Caused Delays.......................................................................... 30
         17.2.    Force Majeure Delays.......................................................................... 31
         17.3.    Statements of Landlord as to Delays........................................................... 31
         17.4.    Minimization of Delays........................................................................ 32

18.      PROJECT FINANCING...................................................................................... 32
         18.1.    Right and Obligation to Arrange............................................................... 32
         18.2.    Retaining a Mortgage Broker to Arrange Financing.............................................. 32
         18.3.    Selection of Lender and Negotiation of Construction Financing................................. 32
         18.4.    Selection of Lender and Negotiation of Take-Out Financing..................................... 33
         18.5.    Inability to Obtain Commitment................................................................ 33
         18.6.    Other Funds................................................................................... 33
         18.7.    Contribution of Tenant........................................................................ 33
         18.8.    Cooperation of Tenant in Construction Financing and Take-Out Financing........................ 34
         18.9.    Financial Covenants of Tenant................................................................. 35
         18.10.   Prevailing Wages.............................................................................. 36
         18.11.   Security Deposit.............................................................................. 36

19.      DETERMINATION OF MONTHLY BASE RENT..................................................................... 36

                                                                           -iii-


20.      FIRST ADJUSTMENT TO REFLECT FINAL PHASE I PROJECT COST................................................. 40
         20.1.    Determination of Final Phase I Project Cost................................................... 40
         20.2.    Possible Review of Final Phase I Project Cost................................................. 40
         20.3.    Payment to Adjust Phase I Project Cost........................................................ 40

21.      SECOND ADJUSTMENT TO REFLECT FINAL PHASE I PROJECT COST................................................ 41
         21.1.    Determination of Revised Final Phase I Project Cost........................................... 41
         21.2.    Possible Review of Revised Final Phase I Project Cost......................................... 41
         21.3.    Payment to Adjust Phase I Project Cost........................................................ 41

22.      PAYMENT OF PHASE II CURRENT COSTS...................................................................... 42
         22.1.    Payment of Certain Phase II Current Costs at Acquisition...................................... 42
         22.2.    Payment of Certain Phase II Current Costs Prior to Construction Financing..................... 42
         22.3.    Payment of Remainder of Phase II Current Costs at Construction Financing...................... 43

23.      PAYMENT FOR DESIGN AND CONSTRUCTION OF PARKING LOT..................................................... 44

24.      ARBITRATION OF DISPUTES................................................................................ 44

25.      ALTERNATIVE PROCEDURE FOR ARBITRATION OF CERTAIN DISPUTES.............................................. 46

26.      NOTICES................................................................................................ 48

27.      EFFECT OF EXERCISE OF OPTION........................................................................... 48

28.      ASSIGNMENT............................................................................................. 48
         28.1.    By Tenant..................................................................................... 48
         28.2.    By Landlord................................................................................... 49

29.      CONFLICTS AND CONFORMITY WITH OTHER DOCUMENTS.......................................................... 49

30.      DESIGNATION OF AGENTS.................................................................................. 49
         30.1.    Designation of Agent by Landlord.............................................................. 49
         30.2.    Designation of Agent by Tenant................................................................ 49

31.      EVENTS OF DEFAULT...................................................................................... 49
         31.1.    Events of Landlord Default.................................................................... 49
         31.2.    Events of Tenant Default...................................................................... 50

32.      WAIVER................................................................................................. 50

33.      ATTORNEYS' FEES........................................................................................ 51

34.      TERMINATION............................................................................................ 51
         34.2.    Termination of Multiple Agreements............................................................ 52
         34.3.    Effect of Termination of the Lease............................................................ 53

35.      PAYMENTS BY LANDLORD................................................................................... 53

36.      INTEREST ON DEPOSITS OR PAYMENTS BY LANDLORD........................................................... 53

37.      MISCELLANEOUS MATTERS.................................................................................. 53