LEASE

                              111 SMITH RANCH ROAD
                             San Rafael, California


         THIS  LEASE,  dated  for  reference  purposes  only,  the  fifth day of
September, 1991, between

                  111 PARTNERS, (hereafter "Landlord")
                  and whose address is:
                  50 Bon Air Center, Suite 140
                  Greenbrae, California 94904

         and FAIR, ISAAC AND COMPANY, INCORPORATED,
                   (hereafter "Tenant")
                  and whose address is:
                  120 North Redwood Drive
                  San Rafael, California 94903-1996

         (a) Demise.  Landlord hereby leases to Tenant, and Tenant hereby leases
from Landlord those certain premises (the "Premises") described as follows:

                  The real  property  described  in  Exhibit  "A' and the office
                  building  to be known as 111 Smith  Ranch Road in San  Rafael,
                  California (the "Building"), and shown on the site plan marked
                  Exhibit  "B,"  comprising  approximately  26,678  square  feet
                  ("Tenant's  Leasable  Area") to be  constructed by Landlord in
                  accordance with paragraph 8 below.

         (b) Terms, Covenants and Conditions.  The parties agree that this lease
is made upon the following terms, covenants and conditions:

1.       TERM:

         (a) The term of this Lease shall  commence on the later of (i) delivery
by Landlord  of the Final  Completion  Notice  described  in  paragraph 9 of the
Leasehold  Improvements  Agreement  (Exhibit  "D")  or  (ii)  ninety  (90)  days
following  the  Delivery  Date  described  in  paragraph  4(e) of the  Leasehold
Improvements  Agreement  (subject to  extensions to which tenant may be entitled
under paragraph 4(b) of the Leasehold Improvements Agreement) (the "Construction
Period").  The commencement date is hereinafter referred to as the "Commencement
Date," The term of this Lease  shall  expire at  midnight  June 30,  2001 unless
Tenant shall exercise the option to renew provided for herein.

         (b) Landlord shall use  reasonable  efforts to  substantially  complete
those  improvements  referred  to in the  Leasehold  Improvements  Agreement  as
"Landlord's  Work" and to deliver  possession of the Premises to Tenant by April
1, 1992 ("Delivery Date").

         The Delivery  Date may be extended on account of delays as set forth in
Article 11 of the Leasehold Improvements Agreement

                                       1                           Exhibit 10.13



2.       MINIMUM RENT:

         a) Tenant and Landlord have entered into a loan agreement  concurrently
with the  execution  of this Lease  whereby  Tenant has agreed to loan  Landlord
funds  to be used  for the  construction  of the  Building.  Said  loan  will be
represented  by a note  ('Note")  secured  by a deed of  trust  encumbering  the
Premises.  Tenant  agrees to pay  Landlord  monthly  rent  equal to the  monthly
payments   payable  under  the  Note  including  both  principal  and  interest,
commencing upon the Commencement Date and continuing throughout the term of this
Lease. In the event the loan is not fully funded upon  commencement of the lease
term and  monthly  installments  are  increased  to  provide  for  repayment  of
additional advances, concurrently with the increase in monthly note installments
the monthly rent shall be increased. Monthly rent payments shall continue in the
manner  provided for in the Note  notwithstanding  any prepayment by Landlord of
the Note. Such monthly rent is herein referred to as the "Note Rent."

         (b) In addition to the Note Rent Tenant promises to pay monthly rent as
set forth below for the use of the land ("Land Rent") as follows:

                  First twelve months of the term:           $3,750.00 per month
                  Second twelve months of the term:          $5,417.00 per month
                  Third twelve months of the term:           $7,500.00 per month
                  Fourth twelve months of the term:          $7,917.00 per month
                  Fifth twelve months of the term:           $8,333.00 per month
                  Sixth twelve months of the term:           $9,167.00 per month

         During the Seventh  twelve  months of the term,  the land rent shall be
the greater of $9,167,00 per month or $9,167 per month  multiplied by a fraction
the numerator of which is the Index (as hereinafter  defined)  published nearest
but  prior to the 73rd  month  of the term and the  denominator  of which is the
Index published for the month of June 1991.

         Commencing  with  the  85th  month  of the  term and at the end of each
twelfth (12th) month thereafter during the term of this Lease, the Land Rent for
the ensuing  twelve (12) month  period (the  "Adjustment  Period".)  shall be an
amount equal to the greater of (i) the Land Rent in effect  immediately prior to
the  commencement  of such  Adjustment  Period  (without regard to any temporary
abatement of rental then in effect pursuant to the provisions of this Lease), or
(ii) the product  obtained by  multiplying  the Land Rent in effect  immediately
prior to the  commencement  of such  Adjustment  Period  (without  regard to any
temporary  abatement of rental then in effect pursuant to the provisions of this
Lease) by a fraction,  the numerator of which is the Index published nearest but
prior to the commencement  date of such Adjustment Period and the denominator of
which is the Index published for the month which is twelve (12) months earlier.

         The term "Index" as used herein shall mean the Consumer Price Index For
All Urban Consumers, San Francisco-Oakland-San Jose, 1982-84 = 100, published by
the Bureau of Labor Statistics of the U.S. Department of Labor. If the Bureau of
Labor Statistics  revises the above Consumer Price Index, the parties agree that
the Bureau of Labor  Statistics will be the sole judge of the  comparability  of
successive indexes.

         (c) The total of the Note Rent and the Land Rent is  referred to herein
as the Minimum Rent.  Tenant agrees to pay the Minimum Rent to Landlord  without
offset or deduction (except as

                                       2



provided herein), prior notice or demand in advance at Landlord's address on the
first day of each month  commencing upon the  commencement of the lease term and
continuing upon the first day of each calendar month  thereafter  throughout the
lease term. If Tenant's obligation to pay rent commences other than on the first
day of a calendar  month,  the first  month's  Minimum  Rent  shall be  prorated
accordingly  and  paid  at the  commencement  of  the  obligation  to pay  rent.
Landlord's  address  shall  be as set  forth  above,  or as  from  time  to time
designated by Landlord to Tenant in writing.  Upon  Landlord's  request,  Tenant
will co-sign Landlord's written  confirmation of the lease commencement date and
the Note Rent.

         (d) Tenant  shall make  payment of Minimum  Rent and other  payments to
Landlord in lawful  money of the United  States;  provided,  if any such payment
made  by a  check,  draft  or  money  order  is  returned  to  Landlord  due  to
insufficient  funds,  or otherwise,  Landlord shall have the right,  at any time
thereafter,  upon  written  notice  to  Tenant,  to  require  Tenant to make all
subsequent  payments in cash, by cashier's  certified check, wire transfer or by
money order.

         (e) It is expressly  understood and agreed that Tenant's timely payment
of Minimum Rent and all other rents, charges and amounts of any kind provided in
this Lease is an unconditional  obligation of Tenant,  and one on which Landlord
is relying in order to meet the financial obligations of the Building.  Tenant's
obligation to pay shall be  continuous  throughout  the term of the Lease,  even
during the pendency of any dispute resolution process which may arise during the
term hereof.


3.       ADDITIONAL RENT, LATE CHARGE AND DEFAULT INTEREST:


         (a) All taxes, insurance premiums, maintenance charges, and other costs
and  expenses  payable  hereunder  by Tenant  (together  with any late charge or
interest  that may accrue  thereon in the event of  Tenant's  failure to pay the
same) and all damages,  costs and expenses which Landlord may incur by reason of
Tenant's default hereunder shall be deemed to be "Additional Rent'. In the event
of non-payment by Tenant of any Additional Rent,  Landlord shall have all of the
rights and remedies with respect  thereto as Landlord has for the non-payment of
Minimum  Rent.  The term  "rentals" or "rental" as used in this Lease shall mean
Minimum Rent, and Additional Rent.

         (b) Tenant  acknowledges that the late payment by Tenant of any rentals
due  hereunder  will cause  Landlord to incur  certain  costs and  expenses  not
contemplated  under this  Lease,  the exact  amount of which  will be  extremely
difficult or impractical to ascertain.  Such costs and expenses include, without
limitation,  administrative  and collection  costs and processing and accounting
expenses.  Accordingly,  if any rental  payable  hereunder  is not  received  by
Landlord from Tenant within ten (10) days after notice that the same is overdue,
Tenant shall immediately pay to Landlord, without prior notice or demand. a late
charge equal to four percent  (4%) of the amount then  delinquent.  Landlord and
Tenant  agree that this late charge  represents  a  reasonable  estimate of such
costs and expenses and is fair compensation to landlord for its losses sustained
by reason of  Tenant's  failure to make timely  payment.  In no event shall this
provision  for the payment of a late charge be deemed to grant to Tenant a grace
period or  extension  of time within  which to pay any rental due  hereunder  or
prevent  Landlord from exercising any right or remedy available to Landlord upon
Tenant's  failure to pay such rental when due,  including the right to terminate
this Lease.

         (c) If any rental  remains  delinquent for a period in excess of thirty
(30) days, in addition to

                                       3


the late charge provided  hereinabove,  Tenant shall pay to Landlord interest on
any rental that is not paid when due at the lesser of twelve  percent  (12%) per
annum or the maximum interest rate permitted by law, from the 30th day following
the date such amount became due, until paid.

         (d) If Tenant  shall  fail to pay  Minimum  Rent  within  ten (10) days
following  the due date  thereof on any three (3) or more  occasions  during any
twelve (12) month period during the lease term,  Landlord  shall have the right,
in addition to any other  rights or remedies it may have  hereunder,  to require
Tenant thereafter to pay Minimum Rent in quarterly installments in advance.

4.       RESERVE FOR RE-LEASING AND SECURITY DEPOSIT:

         (a)  Tenant  shall  pay to  Landlord  a monthly  amount  upon the first
anniversary of the  Commencement  Date and continuing upon the first day of each
calendar  month  thereafter,  an amount  which with  accrued  interest  shall be
sufficient to create the  Re-leasing  Reserve at the end of the lease term.  The
monthly payments shall be deposited into a separate  federally  insured interest
bearing trust account or accounts.  Such accounts  shall remain  Tenant's  funds
subject to Landlord's rights under this paragraph 4.

         (b) The Re-leasing Reserve shall be equal to the sum of the following:

                  1.  Twelve  monthly  payments  due under the Note  payable  to
Tenant (whether or not the Note shall have been prepaid.)

                  2. Real  property  taxes,  personal  property  taxes,  and any
assessments  payable for the 12-month period commencing at the expiration of the
lease term ('Reserve Term").

                  3.  Insurance  premiums  for fire and  extended  coverage  and
public liability insurance payable for the Reserve Term.

                  4. Estimated  costs of maintenance  and repair of the Premises
during the Reserve Term.

         (c) Landlord may pay from the Re-leasing  Reserve after  termination of
this lease all of the costs and expenses included in the Releasing Reserve until
the  Re-leasing  Reserve is fully  expended or  eighty-five  (85) percent of the
Tenant's  Leasable Area has been  re-leased.  Landlord shall deliver to Tenant a
monthly accounting of all amounts paid from the Re-leasing Reserve.  Any balance
remaining  shall be  returned to Tenant.  Said  payments of costs may extend for
more than one (1) year  following the  expiration  of this lease,  but shall not
include any costs or expenses payable by new tenants in the Premises.

         (d) This  paragraph  sets forth the  calculation  of the monthly amount
paid by Tenant to Landlord to create the Re-leasing Reserve and Security Deposit
defined above.  The monthly  payment shall be determined by Landlord as provided
herein during the first full calendar month of the term,  and then  recalculated
every  twelve (12) months  thereafter  throughout  the term of this Lease.  Upon
Landlord's  determination of the monthly amount,  Landlord shall promptly notify
Tenant,  who shall commence  payment of said monthly  amount  beginning with the
first day of the immediately following calendar month.

                                       4




                  The  Re-leasing  Reserve  ("RLR")  amount  at  the  end of the
initial lease term shall be:

                  LP + (OM x (1 + C/100) n) = RLR

Where LP is the total of the monthly  loan  payments  under the note  payable to
Tenant during the previous twelve (12) months, OM is the total of average annual
operation and  maintenance  costs as defined in  paragraphs  4(b)2 through 4(b)4
based on known and  estimated  costs for the previous  twelve  months,  C is the
percentage  change in the  Consumer  Price  Index For All Urban  Consumers,  San
Francisco-Oakland  Area-San  Jose  (1982-1984 = 100)  ("Index")  during the last
twelve months,  and N is the number of months  remaining until expiration of the
initial term of this Lease divided by twelve.

                  The payment (MPRLR) into the reserve shall be:

                  (RLR - (CB x (1 + 1/100) n)             100            = MPRLR
                                               ------------------------
                                               ((1 + 1/100 ) n -1) x 12

where I is the average annual percentage  interest rate earned on the Re-leasing
Reserve in all accounts  during the previous  twelve  months,  CB is the current
balance  including accrued interest in the Re-leasing  Reserve account,  and the
other figures are as defined in paragraph (2) above. For the first  calculation,
the parties  agree that I shall be equal to the  three-month  Treasury Bill rate
(10) days prior to the Commencement Date.

                  Notwithstanding paragraphs (b) through (d), MPRLR shall not be
less than zero and shall be rounded up to the nearest whole dollar.

                  For  example  purposes  only,  assume  CB  is  $50,000,  LP is
$228,000,  OM is $80,000,  C is 5%, N is 8 and I is 7%. RLR is  $346,196.  MPRLR
rounded up to the nearest whole dollar is $2,115.00.

         (e) The Re-leasing Reserve shall also constitute a Security Deposit for
the payment of all amounts  payable by Tenant to Landlord  hereunder.  If Tenant
shall  fail to pay any sum due to  Landlord,  Landlord  may,  but  shall  not be
required to, pay such amount from the Re-leasing Reserve.  Tenant shall promptly
repay to Landlord for deposit into the  Re-leasing  Reserve any such amount paid
to Landlord.

5.       COMMON AREAS AND LANDLORD'S COST OF MAINTENANCE:

         (a) Areas  within the outer  property  lines of the  demised  Premises,
exclusive of the interior building areas which are exclusively leased to Tenant,
and  including  such other  areas that are the  responsibility  of  Landlord  to
maintain  as  required  by the City of San  Rafael,  shall  be known as  "Common
Areas".  The Common  Areas shall be available  for the use of by  Landlord,  its
employees,  and  invitees.  Notwithstanding  any other  provision in this Lease,
Landlord shall have the right from time to time to make changes in additions to,
and deletions  from the Common Areas,  and to alter the purposes to which any of
them may be devoted, all without consent from Tenant,  provided any such change,
addition,  deletion or alteration of purpose would not  materially and adversely
affect Tenant's  continued  ability to operate its business from the Premises in
accordance with its rights

                                       5


under this Lease (except for temporary disruption to Tenant's business caused by
construction  activity).  The use of the  Common  Areas  shall  at all  times be
subject to such  reasonable  rules and  regulations as Landlord may establish in
accordance with paragraph 15 below.

         (b) Beginning  concurrently  with the date of  commencement of Tenant's
obligation to pay Minimum Rent,  Tenant shall pay the total cost of  maintaining
the Common Areas and all portions of the Building  which Landlord is required to
maintain in  accordance  with  paragraph  9. For  purposes of this  paragraph 5,
maintenance  costs  (collectively  "Common  Area  Charges")  shall  include  all
reasonable  general  maintenance,  upkeep,  lighting,  cleaning,  repairs to and
replacements of improvements in the Common Areas, including, but not limited to,
operation,  maintenance and repair of the  underground  utility  systems,  roof,
canopies, awnings, and building exterior painting and maintenance, building roof
repairs,  fire sprinkler  maintenance and inspection,  repairs to the electrical
system,  pavement  repairs and striping,  central  heating,  ventilation and air
conditioning (HVAC) maintenance, planting and landscaping, parking lot striping,
pavement repairs, sealing and replacement, lighting repairs and rubbish removal,
security  services  and  police  protection,   including  traffic  control,   if
necessary,  public  liability  and property  damage  insurance  premiums for the
Building,  improvements  required  by law for  the  operation  of the  Building,
insurance premiums as set forth in paragraph 26 below,  personal property taxes,
depreciation  (if  owned) or rental  payments  (if  rented) on  maintenance  and
operating  machinery and equipment,  and a Management Fee to be paid to Landlord
to compensate it for the supervision of such maintenance, billing and collection
of Tenant's  charges.  Landlord's  Management Fee shall be $958 per month.  Such
Management  Fee  shall be  increased  in the  same  manner  as the Land  Rent as
provided in paragraph  3(b) except that the  adjustment  shall be made  annually
commencing with the thirteenth month of the lease term.  Expenditures for any of
the foregoing  which are of a capital  nature,  as determined in accordance with
generally  accepted  accounting  principles,  such as but not  limited  to major
parking lot  rehabilitation  or  replacement,  shall be prorated over the useful
life of the improvement or facility so replaced,  and there shall be included in
Common  Area  Charges  only  that pro rata  portion  of such  expenditure  as is
properly  allocable to the lease term. Tenant shall pay Landlord the sum of $222
per month,  increased annually in the same manner as Landlord's  management fee,
to establish a maintenance reserve. Expenditures of a capital nature shall first
be paid from the  maintenance  reserve and only  Tenant's  pro rata share of the
excess  shall be  included  in Tenant's  Common  Area  charges.  Any Common Area
Charges  paid by  Tenant  which  are  subsequently  reimbursed  to  Landlord  by
insurance or  condemnation  proceeds shall be reimbursed to Tenant within thirty
(30) days following Landlord's receipt of such proceeds. Any Common Area charges
which relate to offsite  maintenance,  such as expenses relating to the adjacent
pond in the open space area, shall be prorated between  Landlord's Retail Center
and the Premises on the basis of the rentable  square footage  contained in each
parcel.  Landlord  agrees that the manner and method of operation,  maintenance,
upkeep and repair of the  Building  and Common  Areas  shall be in a first class
manner  consistent  with other first  class  office  buildings  located in Marin
County. All expenses shall be characterized and accounted for in accordance with
generally  accepted  accounting  principles.  All  reasonable  costs incurred by
Landlord in good faith shall be conclusive and finally binding upon Tenant.

         (c) Notwithstanding any contrary provisions of the preceding paragraph,
the following costs and expenses are to be excluded from Operating Expenses:

                  1) Repairs of capital nature  occasioned by fire,  earthquake.
windstorm, or other casualty;

                                       6


                  2) Leasing  commissions,  accountants'  or attorneys' fees and
other costs and expenses  incurred in connection with proposals and negotiations
to lease  space in the  Building or legal fees or costs in  connection  with any
particular dispute or litigation with a tenant in the Building;

                  3) Fees paid to Landlord or to  subsidiaries  or affiliates of
Landlord  for  services for the Building to the extent the same exceeds the cost
of such  services if rendered by  unaffiliated  third  parties on a  competitive
basis;

                  4)   Landlord's   general   corporate   overhead  and  general
administrative expenses;

                  5) Rentals and other related expenses  incurred in the capital
leasing of air  conditioning  systems,  elevators  or other  Building  equipment
ordinarily  considered to be of a capital nature,  where such capital leasing is
in lieu of other forms of financing the acquisitions of such systems,  elevators
or equipment;

                  6)       Advertising and promotional expenditures;

                  7)  Penalties  or  fines  assessed  against  Landlord  or  the
Building for  violations  of any  governmental  order,  law,  rule or regulation
applicable thereto, not caused by Tenant;

                  8) Costs of correcting  material  construction  defects in the
Building.

                  Tenant's   obligation   for  Common  Area  Charges   shall  be
determined  and billed monthly by Landlord and shall be payable by Tenant within
ten (10) days from the receipt of the bill.

6.       TAXES:

         Tenant  shall pay at the times and in the manner set forth  below,  all
real estate  taxes,  general  and special  assessments,  license  fees,  levies,
charges,  expenses,  impositions  and  Environmental  Surcharges,  as more fully
described below,  including any real estate tax consultant  expense incurred for
the purpose of maintaining  equitable tax assessments on the Building so long as
the engagement of such consultant,  and the consultant's fee, have been approved
by Tenant, payable with respect to the Premises and the Common Areas as follows:

         (a) "Real estate taxes, general and special assessments,  license fees,
charges, expenses,  impositions" shall mean such taxes, assessments,  levies and
charges levied, assessed or imposed:

                  (i) upon or with  respect  to, or which shall be or may become
liens upon the Premises, the Building, or any portion of them or any interest of
Landlord in them or under this Lease  specifically  excluding  only payments due
for the Smith Ranch subdivision improvement bonds now a lien upon the Premises:

                  (ii) upon or against,  or which shall be measured by, or shall
be or may because liens upon, any rents or rent income,  as such,  payable to or
on behalf of Landlord, in connection with the Premises or any portion of them or
any interest of Landlord in them; or

                  (iii)  upon  or with  respect  to the  ownership,  possession,
leasing, operation. management, maintenance, alteration, repair, rebuilding, use
or occupancy by Tenant of the

                                       7


Premises or any portion of them or any building or improvement of which they are
a part; or

                  (iv) upon this  transaction or any document to which Tenant is
a party creating or transferring an interest or any estate in the Premises; or

                  (v) upon or against  Landlord  or any  interest of Landlord in
the Premises in any manner and for any reason  whether  similar or dissimilar to
the  foregoing;  under or by virtue of any  present  or future  law,  ordinance,
regulation  or  other  requirement  of any  governmental  or  quasi-governmental
authority,  regardless of whether now customary or within the  contemplation  of
the parties  hereto and  regardless of whether  resulting  from  increased  rate
and/or  valuation,  or whether  extraordinary  or ordinary,  general or special,
unforeseen or foreseen, or similar or dissimilar to any of the foregoing.

         (b)  "Environmental  Surcharge"  shall  mean  and  include  any and all
expenses,  taxes,  charges or  penalties  imposed by the Federal  Department  of
Energy,  Federal Environmental  Protection Agency, The Federal Clean Air Act, or
any regulations  promulgated  thereunder,  or any other local,  state or federal
governmental  agency or entity now or hereafter  vested with the power to impose
taxes.  assessments,  or other types of surcharges as a means of  controlling or
abating environmental  pollution or the use of refuse services,  energy or water
in regard to the use,  operation  or occupancy of the  Building,  excluding  any
amounts  attributable  to  conditions  caused by Landlord or its agents or which
predate the Delivery Date.

         (c) All of the items set forth in  subparagraphs  (a) and (b) above are
sometimes collectively referred to in this Lease as "taxes."

         (d) It is the  intention of the parties that insofar as it may lawfully
be done, the  provisions of this  paragraph  should be construed to provide that
the amount of rent  reserved  to  Landlord  under this Lease shall be net of all
taxes  charges to Landlord,  except such  non-real  estate taxes as Landlord may
from time to time be required to pay on such rent in common with other  ordinary
income received by Landlord in the regular course of its business.  In the event
it shall be unlawful for Tenant to reimburse  Landlord for such taxes,  then the
Minimum Rent payable  hereunder  shall be increased pro rata to net Landlord the
same amount that would have been payable to Landlord  prior to the imposition of
any such taxes.

         (f)  Beginning at the  commencement  of the term of this Lease,  Tenant
shall pay to Landlord taxes not less than twenty-one (21) days prior to the date
when such taxes become  delinquent.  Landlord  shall submit to Tenant a bill for
such taxes,  together with true copies of the tax bill at least thirty (30) days
prior to such payment being due to Landlord.  If the law  expressly  permits the
payment  of any  or all of the  above  items  in  installments  (whether  or not
interest  accrues on the unpaid  balance)  Tenant  may,  at  Tenant's  election,
utilize the permitted  installment  method,  but shall pay each installment with
interest before delinquency.

         (g) Landlord shall advise Tenant promptly of all notices  pertaining to
taxes. Notwithstanding anything to the contrary in this Lease, Tenant shall have
the right to contest in good faith the imposition of any tax, a portion of which
is to be paid by Tenant, provided that:

                  (i) Tenant shall bear the  responsibility for timely protests,
legal actions, etc., as may be required for an effective protest:

                                       8



                  (ii) If Landlord has paid such tax,  Tenant shall not withhold
its payment to Landlord of such tax; and

                  (iii) Tenant shall indemnify  Landlord against any loss, cost,
damage or expense  which may arise from such  contest by  indemnity  in form and
content satisfactory to Landlord

                  (iv)  Tenant  shall  pay,  or  cause  to  be  paid,  prior  to
delinquency,  directly  to the  taxing  authority,  any  and all  taxes  levied,
assessed or which become payable  during the lease term upon Tenant's  leasehold
improvements, equipment, furniture, fixtures and other personal property located
in the Premises.

7.       UTILITIES:

         (a) From the commencement of the term of this Lease, and throughout the
term of this  Lease,  Tenant  shall pay for all public and other  utilities  and
related  services  rendered or furnished  to the  Premises,  including,  but not
limited to, water, hot water, gas, electricity,  telephone,  heat, light, sewer,
refuse or garbage collection or disposal, and related deposits.

         (b) Tenant understands that the Marin Municipal Water District ("MMWD")
which  supplies  water to the Building may limit the amount of water  available.
The allocation  based on estimates by MMWD, shall be 2.08 acre feet per year for
potable  water  and 1.1  acre  feet  per  year  for  reclaimed  water  used  for
landscaping  subject to such changes in allocation  during the term of the Lease
as the MMWD may make. If tenant's usage exceeds such allocation, tenant shall be
responsible to reimburse  Landlord for all penalties or surcharges  which may be
imposed by the MMWD on account of such excess use. If  necessary  to protect the
water  allocation  available to the Building,  Landlord  shall have the right to
terminate  water service  after Tenant has used the full amount  available to it
for the  billing  or other  measurement  period  established  by the MMWD.  Such
termination of service shall not relieve tenant of any of its obligations  under
this  lease.  Landlord  Agrees  that such right will not be  exercisable  unless
Tenant has actual notice from Landlord of the amount of the current  allocation,
of the  magnitude  of  Tenant's  usage,  and the fact that  failure by Tenant to
adhere to the allocation level would threaten the building's water allocation.

         (c) Landlord shall maintain the necessary  mains,  conduits,  wires and
cables to bring utilities to the Premises and the cost of such maintenance shall
be included as part of Common Area Charges under paragraph 6 above.

         (d)  Landlord  shall  not  be  liable  in  damages,   consequential  or
otherwise,  nor  shall  there  be  any  rent  abatement,   arising  out  of  any
interruption  whatsoever  in  utility  services  which is due to  causes  beyond
Landlord's  reasonable control,  including,  but not limited to fire,  accident,
strike,  governmental  authority,  acts of  God,  or  other  causes  beyond  the
reasonable  control of Landlord or any  temporary  interruption  in such service
which is necessary to the making of alterations, repairs, or improvements to the
Building or any part of it.

                                       9


8.       CONSTRUCTION:

         (a) The work  for  construction  of the  Premises  is set  forth in the
Leasehold  Improvements  Agreement  (Exhibit "D").  Landlord shall have the sole
responsibility for planning and executing  Landlord's Work included in the Shell
Plans and  Specifications  described in the  Leasehold  Improvements  Agreement.
Tenant shall prepare plans and specifications for Tenant  Improvements and shall
construct  said  improvements  as set forth in the  provisions  of the Leasehold
Improvements  Agreement.  Tenant is granted a Tenant  Improvement  Allance in an
amount  and  subject  to  provisions  set  forth in the  Leasehold  Improvements
Agreement.

         (b) All construction work required or permitted by this Lease,  whether
by Landlord or by Tenant, shall be done in a good and workmanlike manner, and in
compliance  with all applicable laws and all lawful  ordinance,  regulations and
orders of governmental authority and insurers of the Premises.  Either party may
inspect the work of the other at reasonable times and shall promptly give notice
to the other of observed defects.

         (c) Tenant's original installation of equipment and furnishings and all
alterations  and  additions  at any time  thereafter  undertaken  by  Tenant  in
accordance  with  Paragraph 11 below shalI be performed by licensed  contractors
approved  by  Landlord,  in such a manner as to avoid any  labor  dispute  which
causes or is likely to cause  stoppage or impairment of work,  deliveries or any
other services to the Building or any occupant thereof. In the event there shall
be any such stoppage or impairment  which is caused by any such labor dispute or
potential labor dispute,  Tenant shall immediately  undertake such action as may
be necessary to eliminate such dispute or potential dispute, including,  without
limitation, (i) removing all disputants from the job site until such time as the
labor  dispute no longer  exists,  (ii) seeking an  injunction in the event of a
breach of contract  between  Tenant and  Tenant's  contractor,  and (iii) filing
appropriate unfair labor practice charges in the event of a union jurisdictional
dispute.  Any work to be performed  before  Landlord's Work is finished shall be
coordinated with Landlord's Work.

                  Before starting any work, Tenant shall (i) obtain all required
licenses and  permits;  (ii) deliver to Landlord a statement of the names of all
contractors and  subcontractors and the estimated cost of all labor and material
to be furnished by them;  (iii) cause Tenant's  contractors  to carry  workmen's
compensation   insurance  covering  all  the  contractors'  and  subcontractors'
employees,  and public  liability  insurance with liability  limits of the least
$500,000-$1,000,000, and property damage insurance with limits of $100,000, both
general and vehicular (all such insurance to be written by companies licensed to
do business in the State of California, and insuring Landlord and Tenant as well
as the  contractors);  and (iv)  deliver to  Landlord  certificates  of all such
insurance, providing that such insurance may not be canceled without thirty (30)
days prior written  notice to Landlord.  Landlord shall have the right from time
to time during the lease term to increase the minimum liability limits specified
above, to meet changed  circumstances as described in paragraph 27 below. At all
times Tenant shall keep the Premises free from and clear of mechanics' liens.

9.       REPAIRS:

         Landlord  shall  maintain all of the demised  Premises,  excluding  the
Building, and shall maintain the roof, exterior structural walls,  foundation as
to load bearing integrity, fire sprinklers,  electrical panels, and HVAC system.
All of  Landlord's  costs of  maintenance  shall  be  subject  to  reimbursement
pursuant to paragraph 5 hereof.

                                       10


         Tenant  shall,  at  its  sole  cost,   keep  and  maintain   (including
replacements if necessary) the Building, and every part thereof (except as noted
in the preceding  paragraph) and all  appurtenances in clean,  good and sanitary
order,  condition and repair,  and Tenant expressly waives any and all rights it
might  otherwise  have  under the law to make  repairs  or  replacements  at the
expense of the  Landlord.  Tenant  shall keep its sewers and drains (and use the
same only for  designated  purposes) open and clear and shall keep the sidewalks
and Common Areas adjacent to the Premises  clean and free of all debris.  Tenant
agrees  that it will paint,  varnish,  wallpaper,  or  otherwise  redecorate  or
renovate the interior of the Premises and Tenant's trade fixtures when necessary
to maintain the Premises in a first-class condition. Landlord for the benefit of
Tenant will enforce all rights to repair or  replacement of defective work under
contracts for the construction of the Building or Tenant's Improvements.  On the
last day of the term, or at any sooner  termination of this Lease,  Tenant shall
also  surrender  to Landlord the  Premises in good and  sanitary  condition  and
repair, but with reasonable use, wear and tear, or damage by fire, act of God or
by the elements excepted;  and Tenant also agrees to remove all of its signs and
trade fixtures which Tenant has the right to remove from the Premises, restoring
any damage caused by such removal.  Repairs to the premises  required to be made
by Tenant under the  provisions  of this lease must be completed  whether or not
they are due to either  conditions  existing upon the commencement of the lease,
or use during the term of the lease.

                  During  the term of this  Lease  Landlord  shall keep in force
preventative  maintenance  contracts  with  qualified  contractors  covering all
heating and air conditioning  equipment and elevator  equipment which serves the
Premises.

10.      ALTERATIONS:

         Tenant may,  from time to time,  make  non-structural  alterations  and
additions  to  the  interior  of the  Premises  in  accordance  with  plans  and
specifications first approved in writing by Landlord which approval shall not be
unreasonably  withheld or delayed.  Landlord may  disapprove  such plans if they
will result in unusual  expense to re-adapt the Premises to normal office use on
lease termination,  unless Tenant agrees to restore the Premises to its original
configuration prior to lease termination.  All such changes shall become at once
part of the Premises and belong to Landlord.  except for trade  fixtures,  which
may be removed by Tenant,  upon  termination  or  expiration of this Lease term.
Landlord can elect within  thirty (30) days before  expiration  of the term,  or
within five (5) days after  expiration of the term, to require  Tenant to remove
any alterations made by Tenant where Landlord's written approval was conditioned
upon and  reserved  such right.  If Landlord so elects,  Tenant at its sole cost
shall  restore  the  premises  to  the  condition  of  the  premises  prior  the
installation of such alterations designated by Landlord at its election,  before
the last day of the  term,  or  within  thirty  (30)  days  after  notice of the
election is given,  whichever is later. Tenant shall have no right to remove any
fighting fixtures or any portion of the HVAC system or electrical system whether
or not such equipment would otherwise be a trade fixture of Tenant.

         If Tenant  makes any  alterations  to the  premises as provided in this
paragraph,  the alteration  shall not be commenced  until three (3) working days
after Landlord has received notice from Tenant stating the date the installation
of the  alterations  is to  commence  so that  Landlord  can post and  record an
appropriate Notice of Non-Responsibility.

                                       11


11.      SIGNS AND DECORATIONS:

         Tenant  shall  not place or permit  to be  placed,  any sign,  marquee,
awning,  decoration,  window  covering  or other  attachment  on or to the roof,
windows  (inside or outside),  doors  (inside or outside),  visible  portions of
inside walls or exterior  walls of the  Premises or at any other  location in or
adjacent to the Building  without the prior written  consent of Landlord,  which
consent shall not be  unreasonably  withheld or delayed.  Landlord may,  without
liability to Tenant,  enter upon the Premises and remove any such sign, marquee,
awning,  decoration,  window covering or attachment affixed in violation of this
paragraph,  and Tenant agrees to pay the cost of any such removal.  Tenant shall
not  exhibit or affix  flags,  pennants,  banners or similar  items on or to the
exterior of the Premises or the building of which the Premises are a part. Also,
no  advertising  medium  shall  be  utilized  by  Tenant  which  can be heard or
experienced outside the Premises, including without limitation, flashing lights,
searchlights, loudspeakers, phonographs, radios or television.

12.      USE:

         Tenant  agrees to use and occupy the Premises  continuously  during the
term of this Lease for  General  office  use  (including  the use of  computers,
printers,  copiers,  modems and similar equipment and for shipping and receiving
of supplies, materials and mail which is not inconsistent with such office use),
food service for Tenant's  employees and business guests,  and not for any other
purpose.

13.      PARKING:

         There is a cross easement between the Premises and the adjoining Retail
Center for ingress and egress and for parking in the areas shown in Exhibit "B."
Tenant shall not permit its employees to park in the areas designated as visitor
or short-term parking in Exhibit "B." Landlord shall have the right to establish
reasonable  rules  governing the use of the visitor or short-term  parking areas
including limitations on the duration of parking privileges.

14.      RULES AND REGULATIONS:

         Tenant and Tenant's employees and invitees shall faithfully observe and
comply with any reasonable  rules and regulations  governing the Building as may
from time to time be established by Landlord.

15.      COMPLIANCE WITH LAW:

         Except as otherwise provided in this Lease, Tenant,  shall, at Tenant's
sole cost and expense, fully, diligently and in a timely manner, comply with all
"Applicable  Law," which term is used in this Lease to include all laws,  rules,
regulations,  ordinances,  directives,  covenants, easements and restrictions or
record,  permits, the requirements of any applicable fire insurance underwriting
or rating bureau,  and the reasonable  recommendations  of Landlord's  engineers
and/or  consultants,  relating in any manner to the Premises  (including but not
limited to matters  pertaining to (i)  industrial  hygiene,  (ii)  environmental
conditions on, in, under or about the Premises,  including soil and  groundwater
conditions, (iii) the use, generation,  manufacture,  production,  installation,
maintenance, removal, transportation, storage, spill or release of any Hazardous
Substance or storage  tank),  and (iv) traffic,  circulation or parking of motor
vehicles of Tenant, its employees and invitees now in effect

                                       12


or which may hereafter come into effect,  and whether or not reflecting a change
in policy from any previously  existing  policy.  Tenant shall,  within five (5)
days after receipt of Landlord's  written request,  provide Landlord with copies
of all  documents  and  information,  including,  but not limited  to,  permits,
registrations,  manifests,  applications,  reports and certificates,  evidencing
lessee's  compliance  with any Applicable  Law specified by Landlord,  and shall
immediately  upon  receipt,  notify  Landlord  in  writing  (with  copies of any
documents  involved)  of any  threatened  or  actual  claim,  notice,  citation,
warning, complaint or report pertaining to or involving failure by Tenant or the
Premises to comply with any Applicable Law.

16.      PROHIBITED USES:

         (a) No use shall be made or  permitted to be made of the  Premises,  or
acts done,  or materials  stored or used in,  which would  increase the existing
rate of  insurance  upon the building in which the Premises are located over the
standard rate of insurance  prevailing  in the area of the Building,  or cause a
cancellation of any insurance policy covering all or part of such building,  nor
shall Tenant sell, or permit to be kept, used, or sold in or about the Premises,
any  article  which  may be  prohibited  by the  form of fire  insurance  policy
provided in paragraph 29(g) below,  as it may provide from time to time.  Tenant
shall,  at its  sole  cost and  expense,  comply  with any and all  requirements
pertaining to the Premises by any insurance  organization  or company  necessary
for the maintenance of reasonable fire and public liability insurance,

         (b) From and after the date of commencement  of the lease term,  Tenant
shall  keep the  Premises,  and every  part  thereof,  in a clean and  wholesome
condition,  free from any  objectionable  noise,  odors or nuisances,  and shall
comply with all health, safety and police regulations in all respects.

17.      HAZARDOUS SUBSTANCES:

A. Reportable Uses Require  Consent.  The term "Hazardous  Substance' as used in
this lease shall mean any product, substance,  chemical, material or waste whose
presence,  nature,  quantity and/or  intensity of existence,  use,  manufacture,
disposal,  transportation,  spill,  release  or  effect,  either by itself or in
combination  with  other  materials  expected  to be on the  Premises,  which is
either: (i) potentially  injurious to the public health,  safety or welfare, the
environment  or the Premises,  (ii)  regulated or monitored by any  governmental
authority, or (iii) a basis for liability of Landlord to any governmental agency
or third party  under any  applicable  statute or common law  theory.  Hazardous
Substance  shall  include,  but  not be  limited  to,  hydrocarbons,  petroleum,
gasoline,  crude oil or any products,  by-products or fractions thereof.  Tenant
shall not engage in any activity in, on or about the Premises which  constitutes
a Reportable Use (as hereinafter  defined) of Hazardous  Substances  without the
express prior written  consent of Landlord and compliance in a timely manner (at
Tenant's sole cost and expense with all  Applicable Law (as defined in paragraph
13.  "Reportable  Use"  shall mean (i) the  installation  or use of any above or
below ground  storage  tank,  (ii) the  generation,  possession,  storage,  use,
transportation, or deposal of a Hazardous Substance that requires a permit from,
or with  respect to which a report,  notice,  registration  or business  plan is
required to be filed with, any governmental authority. Reportable Use shall also
include Tenant's being responsible for the presence in, on or about the Premises
of a Hazardous  Substance with respect to which any Applicable Law requires that
a notice be given to persons  entering or occupying the Premises or  neighboring
properties.  Notwithstanding the foregoing, Tenant may, without Landlord's prior
consent, but in compliance with all Applicable Law, use any ordinary and

                                       13


customary  materials  reasonably  required  to be used by Tenant  in the  normal
course of Tenant's  business  permitted on the Premises,  so long as such use is
not a Reportable Use and does not expose the Premises or neighboring  properties
to any  meaningful  risk of  contamination  or damage or expose  Landlord to any
liability therefor. In addition,  Landlord may (but without any obligation to do
so)  condition  its consent to the use or presence of any  Hazardous  Substance,
activity or storage tank by Tenant upon Tenant's giving Landlord such additional
assurances as Landlord, in its reasonable discretion, deems necessary to protect
itself,   the  public,   the  Premises  and  the  environment   against  damage,
contamination or injury and/or liability therefrom or therefore,  including, but
not limited to, the  installation  (and removal on or before Lease expiration or
earlier  termination) of reasonably  necessary  protective  modifications to the
Premises  (such as  concrete  encasement)  and/or the  deposit of an  additional
Security Deposit under paragraph 4 hereof.

         (b) Duty to Inform  Landlord.  If Tenant knows, or has reasonable cause
to believe,  that a Hazardous  Substance,  or a condition involving or resulting
from same,  which is a  Reportable  Use has come to be located in, on,  under or
about the Premises,  other than as previously  consented to by Landlord,  Tenant
shall  immediately  give written  notice of such fact to Landlord.  Tenant shall
also  immediately  give  Landlord  a copy  of  any  statement,  report,  notice,
registration,  application,  permit,  business plan,  license,  claim, action or
proceeding  given to, or received  from, any  governmental  authority or private
party, or persons  entering or occupying the Premises,  concerning the presence,
spill,  release,  discharge  of, or  exposure  to, any  Hazardous  Substance  or
contamination  in, on, or about the  Premises,  including but not limited to all
such documents as may be involved in any Reportable Uses involving the Premises.

         (c) Indemnification.  Tenant shall indemnify,  protect, defend and hold
Landlord, its agents, employees, and the Premises, harmless from and against any
and all loss of rents and/or damages,  liabilities,  judgements,  costs, claims,
liens, expenses,  penalties,  permits and reasonable attorney's and consultant's
fees arising out of or involving any Hazardous Substance or storage tank brought
onto  the  Premises  by or  for  Tenant  or  under  Tenant's  control.  Tenant's
obligations  under this  Paragraph  shall  include,  but not be limited  to, the
effects of any  contamination  or injury to person,  property of the environment
created  or  suffered  by  Tenant,  and  the  cost of  investigation  (including
consultant's and attorney's fees and testing), removal, remediation, restoration
and/or abatement thereof,  or of any contamination  therein involved,  and shall
survive the  expiration or earlier  termination of this Lease.  No  termination,
cancellation  or release  agreement  entered  into by Landlord  and Tenant shall
release Tenant from its  obligations  under this Lease with respect to Hazardous
Substances  or storage  tanks,  unless  specifically  so agreed by  Landlord  in
writing at the time of such agreement.

         Landlord shall indemnify, protect, defend and hold Tenant harmless with
respect to any Hazardous  Substance brought upon the Premises by Landlord or its
Agents or  existing  upon the  Delivery  Date to the same extent and in the same
manner.

18.      VOLUNTARY SURRENDER:

         The voluntary or other  surrender of this Lease by Tenant,  or a mutual
cancellation  thereof,  shall not work a merger,  but  shall,  at the  option of
Landlord, either (i) terminate all or any existing subleases or subtenancies, or
(ii)  operate as an  assignment  to  Landlord  of any or all such  subleases  or
subtenancies.

                                       14


19.      NOTICES:

         All notices to be given to Tenant may be given in writing personally or
by depositing the same in the United States mail, postage prepaid, and addressed
to Tenant at Tenant's  address  given on page 1 of this Lease,  or at such other
address as Tenant may indicate from time to time during the term of this Lease.

         Notice by Tenant to Landlord  shall be in writing and  deposited in the
United  States  mail,  postage  prepaid,  addressed  to  Landlord at the address
specified  on Page 1 of this  lease,  or such  other  address  as  Landlord  may
indicate from time to time during the term of this lease.

20.      DELIVERY OF POSSESSION: HOLDING OVER:

         (a)  Immediately  upon  expiration or sooner  termination  of the lease
term,  Tenant shall vacate and deliver to Landlord  possession  of the Premises,
and  except as  provided  in the next  sentence,  all  Tenant  improvements  and
alterations,  broom  clean,  in good  condition  and in  substantially  the same
condition as they were in the commencement of this Lease, or when installed,  if
later,  normal wear and tear  excepted.  Prior to such  delivery,  Tenant  shall
remove all personal property and alterations that Tenant has the right to remove
or is obligated to remove under the  provisions of Paragraph 11 and shall repair
all damage  caused and  perform  all  restoration  necessary  as a result of the
removal of any alterations or personal property.

         (b) If Tenant has vacated the premises  Landlord may elect to retain or
dispose of in any manner any  alterations or personal  property that Tenant does
not remove from the Premises on  expiration or sooner  termination  of the lease
term as allowed or  required  by this Lease.  Title to any such  alterations  or
personal  property that Landlord elects to retain or dispose of after Tenant has
vacated the Premises  shall vest in Landlord.  Tenant waives all claims  against
Landlord for damage or injury to Tenant  resulting from Landlord's  retention of
any such  alteration or personal  property and shall indemnify and hold Landlord
harmless  from  liability  for  damages and all costs and  expenses  incurred by
Landlord  in  defending  claims to any such  alterations  or  personal  property
asserted by any other person.  Tenant shall  reimburse  Landlord upon demand for
Landlord's reasonable costs of storing,  removing,  and/or disposing of any such
alterations or personal property.

         (c) If Tenant fails to vacate and deliver possession of the Premises on
the  expiration  or earlier  termination  of the lease term,  as required  under
subparagraph  (a) above,  Tenant shall hold  Landlord  harmless from all damages
resulting  from  Tenant's  failure to so vacate and  deliver  possession  of the
Premises,  including,  without  limitation,  claims made by a succeeding  tenant
resulting from Tenant's failure to vacate and deliver possession of the Premises
and  any  rental  loss  suffered  by  Landlord.   Tenant  understands  that  the
termination date of this lease was selected to occur prior to expected vacancies
in other buildings in the vicinity and that  consequently  any delay in vacating
the Premises may substantially  adversely affect Landlord's  ability to re-lease
the Premises.

         (d) If Tenant,  with Landlord's  consent,  remains in possession of the
Premises after  expiration of the lease term, such possession by Tenant shall be
deemed to be a  month-to-month  tenancy  terminable  on thirty  (30) days notice
given at any time by either party.  All  provisions of this Lease,  except those
pertaining  to  term,  and  option  to  extend,  if  any,  shall  apply  to  the
month-to-month  tenancy,  provided  that the Minimum  Rent shall be  one-hundred
twenty-five percent (125%) of

                                       15


the minimum rent payable during the last month of the lease term.

         (e) Tenant shall vacate and deliver  possession of the Premises free of
all liens,  charges,  or  encumbrances  resulting  from any act or  omission  on
Tenant's  part and  free  and  clear of all  violations  thereon  placed  by any
federal,  state,  municipal or other agency or  authority,  and shall  indemnify
Landlord against any and all loss,  expense,  damage,  costs, or attorneys' fees
arising out of Tenant's failure to do so.

21.      ENTRY BY LANDLORD:

         Tenant  shall  permit  Landlord and its agents to enter the Premises at
reasonable times upon reasonable  notice for any of the following  purposes:  to
inspect the same;  to maintain  the  Building to make  repairs,  alterations  or
additions to any portion of the Building;  to post notices of non-responsibility
for alterations, additions or repairs undertaken by Tenant; to install a leasing
signs upon the  Premises  during the final one hundred  twenty (120) days of the
lease term;  to show the  Premises to  prospective  purchasers  or lenders  and,
during the final one hundred eighty (180) days of the lease term, to prospective
Tenants:  and to install,  use and maintain pipes,  ducts,  conduits,  wires and
appurtenant  meters and  equipment in the  Premises.  Landlord may exercise such
right of entry without any abatement of rent to Tenant for any loss of occupancy
or quiet  enjoyment  of the Premises  unless  Landlord is negligent or acts with
willful disregard of Tenant's  business  interests when making such entry, or if
the need for such repairs  arise from the  negligent or willful act of Landlord,
its employees or agents.

22.      LANDLORD'S CONVEYANCE:

         If during the term of this Lease  Landlord,  its successors or assigns,
conveys  all or part of its  interest in the  Premises,  then from and after the
effective date of the conveyance, Landlord shall be released and discharged from
any and all  obligations  under  this  Lease with  respect  to the  interest  so
conveyed,  except those already accrued. If Landlord conveys,  assigns and sells
all its interest in the  Premises to a third party,  Tenant shall attorn to such
party as if it had been named as Landlord under this Lease,

23.      ASSIGNMENT AND SUBLETTING:

         Tenant  shall not  assign  this  lease or  sublet  any  portion  of the
Premises  without the prior written  consent of Landlord.  No such assignment or
subletting shall relieve Tenant of its obligations hereunder. Landlord shall not
unreasonably  withhold such consent.  In determining  whether or not to consent,
Landlord may consider all relevant  factors,  including  but not limited to, the
financial  responsibility  of the  proposed  tenant,  the nature of the tenant's
business,  any  modifications  to the  building  which  might be  required,  any
increased  burden upon the parking  facilities,  traffic,  water usage, or other
factors  which  affect  Landlord  as the  owner  of the  Premises  and  adjacent
property.  Tenant shall  reimburse  Landlord for all reasonable  legal and other
expenses incurred by Landlord in reviewing such requests for consent.

24.      SUCCESSORS:

         All the terms,  covenants and conditions of this Lease shall be binding
upon and inure to the

                                       16


benefit of the heirs, executors,  administrators,  successors and assigns of the
parties hereto, and in the case of Tenant, all amounts due and payable hereunder
shall be the obligation of such heirs,  executors,  administrators  and assigns,
regardless  of the time  period to which such  amounts  relate.  Nothing in this
paragraph shall be deemed to permit any assignment, subletting, occupancy or use
contrary to the provisions of paragraph 23 above.

25.      INDEMNIFICATION AND LIABILITY INSURANCE:

         Landlord,  its managing  agent,  and architects  shall not be liable to
Tenant, its officers, agents, employees, customers, invitee or third parties for
loss or damage to property,  including goods,  wares and  merchandise,  for lost
profits,  or for injury or death to persons in, on, or about the  Premises,  and
Tenant agrees to indemnify and hold Landlord, its managing agent, and architects
harmless  from and on account  thereof no matter how arising or by whom  caused,
except for such loss or damage as may be caused by the negligence or willful act
or omission of Landlord, its agents,  architects or employees for which Landlord
shall  be  liable  and  for  which  Landlord  shall  indemnify  Tenant.   Tenant
acknowledges that the provisions of Paragraph 37 below require Tenant to pay all
Landlord's,  its  managing  agent's and  architect's  costs,  expenses  and fees
resulting from any action  associated with such loss,  damage,  injury or death,
unless caused by Landlord's negligence or willful act.

         During the term of this Lease,  Tenant shall maintain in full force and
effect with insurance  companies with general policy holder's rating of not less
than A and a  financial  rating of not less than X as rated in the most  current
available "Best's"  Insurance  Reports,  licensed to do business in the state in
which the  Building  is  located,  comprehensive  liability  insurance  policies
applicable to the Premises and Tenant's activities,  including contractual, with
limits of liability per person,  per occurrence and for property damage at least
equal to a combined  single  limit  policy of  $1,000,000.  The  minimum  limits
specified above are the minimum amounts required by Landlord, and may be revised
by Landlord from time to time, but not more frequently than once each year, when
reasonably  necessary  to  meet  changed   circumstances,   including,   without
limitation  (i)  changes in the  purchasing  power of the dollar,  (ii)  changes
indicated by the amount of  plaintiffs;  verdicts in personal  injury actions in
the State of California, or (iii) changes consistent with the standards required
by  Landlords  of other  similar  buildings  located  in the County in which the
Building  is  located.  Such  liability  insurance  shall  be  primary  and  not
contributing to any insurance carried by Landlord,  and Landlord's insurance (if
any) shall be in excess thereof.

         Tenant  shall  cause  Landlord  and its  managing  agent to be named as
additional insured, and certificates evidencing such coverage and providing that
the  insurance  may not be  cancelled  without  thirty (30) days' prior  written
notice to  Landlord  shall be  delivered  to  Landlord  prior to  Tenant  taking
possession of the Premises or entering to commence fixturization.

26.      INSURANCE PREMIUMS:

         Tenant  shall pay to Landlord as part of Common Area  Charges  provided
for in Paragraph 6 above,  all premiums paid by Landlord for the property damage
insurance  policy described in Paragraph 28(g) below, or an appropriate pro rata
share of the premiums if the policy  insures more than the  Premises.  Provided,
however,  that  Tenant's  liability  for the payment of premiums for  earthquake
insurance shall not exceed $10,000 per annum increased in the same manner as the
Management Fee as provided in paragraph 5(b), and the earthquake  insurance must
provide for a deductable of five percent (5%) or less of the damage.

                                       17


27.      SUBROGATION WAIVER:

         With  respect to all  policies of  insurance  which are required by the
provisions  of this Lease  Landlord  and Tenant each agree to obtain a clause or
endorsement denying to the insurer rights of subrogation against the other party
to the extent such rights have been waived by the insured  under the  provisions
of this Lease.

         Each  party,  notwithstanding  any  provisions  of  this  Lease  to the
contrary,  waives any right of recovery against the other for injury or loss due
to hazards covered by insurance to the extent of the insurance coverage required
by this Lease.

28.      DAMAGE AND DESTRUCTION:

         (a) If the Building is destroyed or materially  damaged  (i.e.,  to the
extent of five  percent (5%) or more of the then full  replacement  cost) from a
cause not insured  against under  Landlord's  casualty  insurance  policy,  with
extended  coverage,  Landlord  shall have the right to  terminate  this Lease by
giving written notice of termination to Tenant within thirty (30) days after the
date of such  damage or  destruction.  If the Lease is not so  terminated,  then
Landlord shall diligently proceed to repair and restore the Building.

         (b) If the Building is  materially  damaged or  destroyed  from a cause
covered by  Landlord's  casualty  insurance  referred to above,  and they may be
repaired or restored  within one hundred fifty (150) days after  commencement of
repair or  restoration,  then Landlord  shall  diligently  proceed to repair and
restore  the  Premises.  If  Landlord  determines  that the  Premises  cannot be
repaired or restored within such a period. then Landlord shall have the right to
terminate  this Lease by written  notice to Tenant  given within sixty (60) days
after the date of such damage or  destructions,  and Tenant's  obligation to pay
rent and other  charges  under this Lease shall  terminate as of the date of the
damage or destruction, or the date Tenant ceases to do business at the Premises,
whichever date is later.

         (c) If the Building is damaged to the extent of fifty  percent (50%) or
more of its  replacement  cost,  Landlord may elect to  terminate  this Lease by
written  notice to Tenant  given  within  sixty (60) days after the date of such
destruction.

         (d) If in any case  which is the  subject  of this  paragraph  29,  the
Premises or any portion thereof is rendered unfit for use and occupancy and this
Lease is not terminated as provided above, a just proportion of the Minimum Rent
in light of the  nature  and  extent of the  damage  shall be  abated  until the
Premises,  excluding any fixtures or items installed or paid for by Tenant which
Tenant is entitled or required to remove under this Lease, have been restored by
Landlord as provided above.

         (e) Except as expressly provided otherwise in this Lease,  damage to or
destruction  of the  Premises  shall not  terminate  this Lease or result in any
abatement  or  rentals  payable  hereunder.  Tenant  waives  any right of offset
against  its  rental  obligations  provided  by any  statute  or  rule of law in
connection with Landlord's duties of repair and restoration under the provisions
of this Lease.

         (f) Landlord's duties of repair and restoration under the provisions of
this Lease shall  extend only to those  portions of the Premises  insured  under
Landlord's casualty insurance with

                                       18


extended  coverage  endorsements  and Landlord shall not be responsible  for any
loss,  damage,  or  destruction  to Tenant's  to  fixtures,  inventory  or other
Tenant-owned property.

         (g) Landlord  shall  obtain and  maintain in force a standard  fire and
extended risk insurance  policy with Landlord as insured,  insuring the Premises
and  building  of  which it is a part in  amounts  and in form  satisfactory  to
Landlord,  which may also include, at Landlord's option, rental continuation for
a period of  twelve  (12)  months,  earthquake  (subject  to the  provisions  of
paragraph 26), flood, demolition,  increased cost of construction due to changes
in building  codes,  and such other coverage as Landlord deems prudent or as may
be  required  under  the  terms  of any  mortgage  or deed of  trust at any time
encumbering the Building of which the Premises form a part. Any proceeds of such
insurance shall be payable to Landlord and used for repair and reconstruction of
the  improvements,  if  Landlord  is  obligated  under  this  Lease to repair or
reconstruct,  subject to any  requirements as to the disposition of the proceeds
that may be imposed by the  beneficiary  under any  mortgage or deed of trust at
any time encumbering the Building.

         (h) Tenant  shall  obtain  and  maintain  in force a standard  fire and
extended coverage insurance policy on all of Tenant's personal  property,  in an
amount equal to their full replacement value.

29.      DEFAULT:

         (a) The following events shall constitute events of default by Tenant:

                  (i) Abandonment of the Premises;  or dispossession of Premises
by power of law or otherwise;

                  (ii)  failure  to pay any  installment  of  Minimum  Rent,  or
Additional  Rent on the date when any such  payment is due,  with such a failure
continuing  for a  period  of  ten  (10)  days  after  written  notice  of  such
delinquency,  except  that in the case of Minimum  Rent,  no  written  notice of
delinquency shall be required:

                  (iii)  assignment or subletting in violation of the provisions
of paragraph 23;

                  (iv)  failure  by  Tenant  to  perform  any  other  covenants,
agreements  or  obligations  required  of Tenant  under  this  Lease with such a
failure  continuing  for thirty (30) days after written  notice of such failure:
provided,  however, if the nature of the failure is such that it cannot with the
exercise of  reasonable  diligence  be cured within said thirty (30) day period,
then Tenant shall not be in default hereunder if it shall promptly commence such
cure (in any event within said thirty-day period) and thereafter pursue the same
to completion with diligence and continuity; provided, further, however, if such
failure is of a nature which adversely affects the health and safety of users of
the Building,  obstructs or impedes the flow of pedestrian and vehicular traffic
through the Common Areas,  or adversely  affects the appearance of the Building,
and can with the  exercise of  reasonable  diligence  be cured  within a shorter
period of time, then the applicable cure period  following  notice shall be such
shorter period of time. If on three (3) or more  occasions  during any period of
twelve  (12)  consecutive  months  during  the lease term  Tenant  shall fail to
perform any obligation  hereunder which adversely  affects the health and safety
of the Common Areas,  and  regardless of whether such prior  failures shall have
been cured within the required time period, then,  commencing on the fourth such
failure, no prior notice shall be required;

                  (vi) a  general  assignment  by  Tenant  for  the  benefit  of
creditors;

                                       19


                  (vii) the filing of a  voluntary  petition  in  bankruptcy  by
Tenant or the filing of an involuntary petition by Tenant's creditors, with such
a petition remaining undischarged for a period of ninety (90) days;

                  (viii) the  appointment  of a receiver to take  possession  of
substantially  all  of  Tenant's  assets  or  of  the  Premises,   with  such  a
receivership remaining undissolved for a period of ninety (90) days;

                  (ix) the  attachment,  execution or other judicial  seizure of
substantially  all of Tenant's assets or the Premises,  with such an attachment,
execution or other seizure remaining  unreleased or undischarged for a period of
ninety (90) days after the levy thereof;

                  (x) the  chronic  delinquency  by  Tenant  in the  payment  of
rentals due hereunder,  with "chronic delinquency" meaning the failure by Tenant
to pay any rental by the required due date on seven (7) or more occasions during
any 12-month period.

         (b) Upon any of the above events of default or any other breach of this
Lease by, then Landlord, besides other rights or remedies it may have under this
Lease or by law, shall have the right to: (i)  immediately  terminate this Lease
and Tenant's right to possession of the Premises by giving Tenant written notice
that this Lease is terminated,  in which event, upon such termination,  Landlord
shall  have the right to  recover  from  Tenant the sum of; (A) the worth at the
time  of  award  of the  unpaid  rent  which  has  been  earned  at the  time of
termination;  (B) the  worth at the time of award  of the  amount  by which  the
unpaid  rent which would have been earned  after  termination  until the time of
award  exceeds the amount of such rental loss that Tenant  affirmatively  proves
could have been  reasonably  avoided;  (C) the worth at the time of award of the
amount by which the  unpaid  rent for the  balance of the term after the time of
award  exceeds the amount of such rental loss that Tenant  affirmatively  proves
could be  reasonably  avoided;  (D) any other  amount  necessary  to  compensate
Landlord for all the detriment proximately caused by Tenant's failure to perform
Tenant's  obligations under this Lease or which in the ordinary course of things
would be likely to result therefrom;  and (E) all such other amounts in addition
to or in lieu of the  foregoing  as may be  permitted  from  time to time  under
applicable  law;  or (ii)  have this  Lease  continue  in effect  for so long as
Landlord does not terminate  this Lease and Tenant's  right to possession of the
Premises,  in which  event  Landlord  shall  have the  right to  enforce  all of
Landlord's rights and remedies under this Lease,  including the right to recover
all  rentals  payable by Tenant  under this Lease as they  become  due, or (iii)
without  terminating  this Lease,  make such  alterations  and repairs as may be
necessary  in order to relet the  Premises,  and relet the  Premises or any part
thereof  for such term or terms  (which may be for a term  extending  beyond the
term of this  Lease) and at such rental or rentals and upon such other terms and
conditions as Landlord in its sole discretion may deem advisable. Upon each such
reletting all rent and other sums received by Landlord from such reletting shall
be applied,  first,  to the payment of any  indebtedness  other than rentals due
hereunder  from  Tenant to  Landlord:  second,  to the  payment of any costs and
expenses of such reletting,  including  reasonable brokerage fees and attorney's
fees and of costs of such  alterations  and  repairs;  third,  to the payment of
rentals due and unpaid  hereunder;  and the  residue,  if any,  shall be held by
Landlord and applied in payment of future rentals payable by Tenant hereunder as
the as the same may become due and payable hereunder. If the rent and other sums
received  from such  reletting  during  any month are less than the rental to be
paid during that month by Tenant hereunder, Tenant shall pay such

                                       20


deficiency to Landlord;  if such rent and other sums shall be more, Tenant shall
have no right to the  excess.  Such  deficiency  shall  be  calculated  and paid
monthly.  No re-entry or taking  possession of the Premises by Landlord shall be
construed  as an election on its part to  terminate  this Lease unless a written
notice of such intention is given to Tenant or unless the termination thereof is
decreed by a court of competent jurisdiction. Notwithstanding any such reletting
without termination, Landlord may at any time thereafter elect to terminate this
Lease for such previous breach. Should Landlord at any time terminate this Lease
for any breach,  in addition to any other  remedies it may have,  it may recover
from Tenant all  damages it may incur by reason of such  breach,  including  the
cost of recovering  the Premises and  reasonable  attorneys'  fees, all of which
amounts  shall be  immediately  due and  payable  from Tenant to  Landlord.  The
failure or refusal of Landlord to relet the Premises  shall not affect  Tenant's
liability. At its option, Landlord may request the appointment of a receiver for
Tenant to take possession of the Premises and to exercise all rights of Landlord
herein  relating to the taking of possession of and reletting the Premises,  and
to apply any rent and other sums  collected from the Premises  accordingly.  The
terms "entry" and "re-entry" are not limited to their  technical  meanings.  For
the  purpose  of this  paragraph:  "worth at the time of award"  as  defined  in
Subparagraphs  (b) (i) (A) and (B) shall be computed by allowing interest at the
rate of ten  percent  (10%) per  annum,  and for  Subparagraph  (i)(c)  shall be
computed by discounting  such amount at the discount rate of the Federal Reserve
Bank of San Francisco at the time of award plus one percent (1%).

         (c) Upon any such event of default or breach, all of Tenant's fixtures,
furniture, equipment,  improvements,  additions, alterations, and other personal
property shall remain on the Premises and,  during the length of such default or
breach,  Landlord shall have the right to take the exclusive  possession of them
and to use them,  rent or  charge  free,  or to  remove  and store the same in a
public  warehouse  or  elsewhere  at the cost of and for the  account of Tenant,
until all  defaults  are cured or, at  Landlord's  option at any time during the
remaining term of this Lease, to require Tenant to immediately remove the same.

         (d) The  waiver by  Landlord  of any  breach of any term,  covenant  or
condition  of this Lease  shall not be deemed to be a waiver of any other  term,
covenant or  condition or any  subsequent  breach of the same or any other term,
covenant, or condition.  The subsequent acceptance of rent by Landlord shall not
be deemed to be a waiver of any preceding breach by Tenant of any term, covenant
or  condition  of this  Lease,  other  than the  failure  of  Tenant  to pay the
particular  rent  so  accepted,  regardless  of  Landlord's  knowledge  of  such
preceding breach at the time of acceptance of such rent.

30.      RIGHT OF LANDLORD TO PERFORM:

         All covenants and agreements to be performed by Tenant under any of the
terms of this  Lease  shall be  performed  by Tenant at  Tenant's  sole cost and
expense and without any  abatement  of rent.  If Tenant  fails to pay any sum of
money  required to be paid by it hereunder to third  parties or fails to perform
any other act on its part to be performed  hereunder and such failure  continues
for ten (10) days  after  notice  thereof by  Landlord,  Landlord  may,  without
waiving or releasing  Tenant from any  obligations  of, make any such payment or
perform any such other act on Tenant's behalf.  All sums so paid by Landlord and
all necessary  incidental costs,  together with interest on all of the foregoing
at the default  rate  specified  in  Paragraph  4(c) above from the date of such
payment by Landlord, shall be payable to Landlord on demand.

                                       21


31.      CONDEMNATION:

         (a) If during the lease term, the Premises,  or any substantial portion
thereof  (i.e.,  ten percent  (10%)) or more of the gross  leasable  area),  are
damaged by action of public or other  authority or are taken by eminent  domain,
or if Landlord receives  compensable  damage by reason of anything lawfully done
in pursuance of public or other authority in connection with the Premises,  this
Lease shall terminate at Landlord's election, which election may be made whether
or not  Landlord's  entire  interest  has been  divested.  If only a part of the
Premises is taken and the remainder is insufficient for Tenant's purposes or, in
case of such damage or taking,  if the time needed to do the  construction  work
necessary to put the Premises or such remainder in proper  condition for use and
occupation is reasonably estimated to exceed six (6) months, or if Landlord does
not  commence  within  sixty (60) days after the damage or the  surrender of the
part taken and proceed with  reasonable  diligence  to do such work,  Tenant may
terminate  this Lease,  without  penalty,  by written  notice  given to Landlord
within thirty (30) days after the right to terminate arises. If in any such case
the Premises are rendered  unfit for use and  occupation and the Lease is not so
terminated,  a just  proportion of the Minimum Rent  according to the nature and
extent of the injury  shall be abated until the Premises (or in case of a taking
what may remain  thereof,  excluding any fixtures or items installed or paid for
by Tenant which Tenant is entitled or required to remove by agreement, have been
put by Landlord in proper  condition for use and  occupation;  and, in case of a
taking which permanently reduces the area of the Premises,  a just proportion of
the Minimum Rent shall be abated for the remainder of the lease term.

         (b) The entire award or compensation in such proceedings, whether for a
total or partial  taking or for  diminution in the value of the leasehold or for
the fee,  shall belong to and be the property of  Landlord;  provided,  however,
that Tenant shall be entitled to recover from the condemnor such compensation as
may be separately  awarded by the condemnor to Tenant,  or recoverable  from the
condemnor  by Tenant in its own  right,  for the  taking of trade  fixtures  and
equipment  owned by  Tenant  (meaning  personal  property,  excluding  fixtures,
whether or not  attached  to the real  property,  which may be  removed  without
injury to the  Premises)  for  business  goodwill  and for  Tenant's  relocation
expenses.  Each party waives any statutory right in conflict with the provisions
of this Paragraph 33,  including,  without  limitations  rights under California
Code of Civil Procedure Section 1265.130.

         (c) If the Premises or any part of them are taken for temporary use:

                  (i)  this  Lease,  including  Tenants'  obligation  to pay all
rentals hereunder, shall be and remain in full force and effect, and

                  (ii)  Tenant  shall be  entitled  to receive  such  portion or
portions of any award made for such use with respect to the period of the taking
which is within the lease term, provided that is such taking remains in force at
the expiration or earlier  termination  of this Lease,  Tenant shall then pay to
Landlord a sum equal to the reasonable cost of performing  Tenant's  obligations
under Paragraph 10 above with respect to surrender of the Premises and upon such
payment shall be excused from such obligations.

32.  OPTION TO RENEW:  So long as Tenant  shall not be in default at the time of
the  exercise of the option,  Landlord  grants to Tenant the option to renew the
Lease for an additional term of five (5) years commencing upon the day following
the expiration date of the initial term upon the following terms and conditions:

                                       22


         (a) The option shall be exercised  by written  notice to Landlord  from
Tenant delivered not more than one year prior to the commencement of the renewal
term,  and not less than nine months  prior to the  commencement  of the renewal
term. The notice shall be accompanied by Tenant's  financial  statements for its
most recent fiscal year and any subsequent  interim periods for which Tenant has
issued financial statements. If such financial statements indicate that Tenant's
financial  condition is not  satisfactory  to reasonably  ensure payment of rent
under the Lease for the option  term,  Landlord may refuse to honor the exercise
of such option.  In the event that the option is not  exercised  within the time
provided, it shall expire.

         (b) If the option is exercised,  during the renewal  term,  the minimum
rent (in lieu of the Note Rent and the Land Rent) shall be equal to  ninety-five
percent  (95%)  of the fair  rental  value  of the  premises  at the date of the
commencement of the renewal term. In determining the fair rental value, the term
of the  Lease,  and all the other  terms and  conditions  of the Lease  shall be
considered.  The fair rental value shall be  determined on the basis of the fair
rental  value of a rentable  square  foot of  comparable  office  space in Marin
County. No consideration shall be given to the fact that Tenant shall occupy the
entire building.

                  Upon the  exercise  of the option,  the parties  shall make an
attempt to determine  the fair rental value of the  premises.  In the event that
they are unable to do so within a period of two (2) months from the  exercise of
the  option,  each  party  shall  appoint an  appraiser  who shall be a licensed
appraiser or a licensed  commercial  real estate broker doing  business in Marin
County,  with at least five years experience in commercial leasing of comparable
property in Marin County. The two appraisers shall meet and attempt to determine
the fair  rental  value of the  premises.  If they are unable to agree  within a
period of thirty (30) days  thereafter,  the two shall choose a third  appraiser
who shall be similarly  qualified.  The third appraiser shall determine the fair
rental  value of the premises  and his  determination  shall be binding upon the
parties. Provided, however, that the fair rental value of the premises shall not
be less than the rental paid during the last lease year of the initial term, nor
less than the fair rental value  proposed by the appraiser  appointed by Tenant,
and shall not be more  than the fair  rental  value  proposed  by the  appraiser
appointed by Landlord.

                  If either  party  shall fail to appoint its  appraiser  at the
time  provided,  or if the two  appraisers  shall  fail  to  appoint  the  third
appraiser  within the time  provided,  upon  application  by either  party,  the
appraisers  shall be  appointed  by the  president  of the Marin County Board of
Realtors.

                  Each  party  shall  pay  the  compensation  of  its  appointed
appraiser and one-half the compensation of the third appraiser.

         (c) The rent shall be adjusted  annually in accordance  with changes in
the Index as described in paragraph 2 commencing one year from the  commencement
date of the  renewal  term  using a base  Index  which  shall be the Index  last
published prior to the  commencement of the renewal term and an adjustment index
which shall be the Index last published prior to the adjustment date.

         (d) All the  remaining  terms and  conditions of the Lease shall apply,
including,  but not limited to, the provisions for payment of additional rent in
the form of common  area  charges,  taxes,  insurance,  and  maintenance  of the
building.

                  No additions shall be made to the Re-leasing  Reserve provided
for herein,  but the  reserve  shall be  maintained  and shall be  available  to
Landlord at the expiration of the renewal term.

         (e) In the event the option is exercised,  Landlord  shall use its best
efforts to obtain a new

                                       23






loan to be secured by the premises  sufficient  to repay the balance of Note and
the costs of  refinancing.  If Landlord is unable to secure a loan providing for
monthly payments of interest and principal  sufficient to amortize the principal
over a term of not less  than  twenty-five  (25)  years  which  does not  exceed
eighty-five percent (85%) of the net operating income from the building, and due
in not less than seven (7) years from the Commencement  Date of the Renewal Term
then as a condition  for the renewal of the Lease,  Tenant  shall be required to
extend  the  maturity  date of the Note for a period of five (5) years  from the
date the Note is  otherwise  due, or in the  alternative,  cancel the option and
vacate the premises at the end of the then current term.  If Tenant  proposes to
assign  the Note to a third  party  during  the  extension  period  of the Note,
Landlord agrees to terminate its right to offset payments under the Note against
rent due, if financial  statements  submitted by Tenant indicate that Tenant has
sufficient  income to pay the rent under the Lease.  Such  termination  shall be
effective upon assignment of the Note by Tenant.  Net operating income means the
Minimum Rent less the expenses of operating  the Demised  Premises to the extent
not  reimbursed by Tenant and  specifically  excluding any interest or principal
loan payments or depreciation.

                  In the event that the foregoing  option to renew is exercised,
Tenant shall have two additional  five-year options to renew upon the same terms
and  conditions  with the fair rental value of the premises to be  determined in
the same manner at the time each option is exercised.

                  In the event that  Tenant  fails to  exercise  an option,  all
subsequent options shall terminate.

33. FIRST RIGHT OF  NEGOTIATION:  In the event that Landlord shall elect to sell
the building during the term of the Lease,  Tenant shall have the first right to
negotiate for the purchase upon the following terms and conditions:

                  Prior  to  listing  the  building  for  sale,   and  prior  to
negotiation with respect to sale to any third party, Landlord shall give written
notice to Tenant that  Landlord  wishes to sell the  building,  and shall advise
Tenant of the proposed  sale price and other terms and  conditions  of the sale.
For a period of thirty (30) days thereafter, Landlord and Tenant shall negotiate
in good faith for the  purchase and sale of the  building.  In the event that no
agreement  is reached  during said time,  Landlord may list the building and may
offer the building for sale to third parties  without any further  obligation to
Tenant except that if Landlord  proposes to make sale of the building for a sale
price which is more than ten percent  (10%) less than the last price  offered to
Tenant, Landlord shall give written notice of such proposed price to Tenant, and
within a  period  of five (5)  working  days  thereafter,  Tenant  may  elect to
purchase  the  building at the reduced  price and upon the terms and  conditions
proposed.

                  In the event that Landlord  receives an unsolicited  offer for
purchase of the building  which Landlord  wishes to accept,  Landlord shall give
Tenant written notice of such offer and shall include a copy of the offer in the
notice.  Within ten (10) working days following  submission of the offer, Tenant
shall have the option to purchase the building from Landlord upon the same terms
and conditions as are offered by such third party.

                  This  provision  shall not  apply to the sale of an  undivided
interest  in  the  property,  nor  to a  dissolution  or  reorganization  of the
partnership  so long as the existing  partners  retain more than a fifty percent
(50%) beneficial interest in the building.

                                       24


                  In  the  event  that  the  proposed  sale  provides  for a tax
deferred  exchange to be made, as a condition for the purchase,  Tenant shall be
required to cooperate with Landlord in connection with such exchange.

34.      SUBORDINATION:

         This lease is and shall be prior to any encumbrance  recorded after the
date of this Lease affecting the premises.  If, however,  a lender requires that
this  Lease  be  subordinate  to any  such  encumbrance,  this  Lease  shall  be
subordinate  to the  encumbrance  if Landlord  first  obtains  from the lender a
written statement that provides substantially as follows:

         "As long as Tenant  performs  its  obligations  under  this  Lease,  no
         foreclosure of, deed given in lieu of foreclosure of, or sale under the
         encumbrance,  and no steps or procedures  taken under the  encumbrance,
         shall affect  Tenant's  rights under this Lease.  Tenant shall attom to
         any purchaser at any foreclosure  sale, or to any grantee or transferee
         designated  in any deed in lieu of  foreclosure  so long as such  party
         executed a document  indicating that it will recognize  Tenant's rights
         under the Lease,  provide quite  enjoyment of the Premises to Tenant so
         long as Tenant is not in default,  and shall perform the obligations of
         Landlord hereunder."

         Tenant shall execute any written agreement or other documents  required
by the lender to accomplish the purpose of this paragraph.

35.      LANDLORD DEFAULT; MORTGAGEE PROTECTION:

         (a) In the event  Landlord  shall neglect or fail to perform or observe
any of the terms covenants,  or conditions contained in this Lease on it part to
be performed or observed within thirty (30) days after written notice of default
(or if more than thirty (30) days shall be required because of the nature of the
default,  if Landlord shall fail to commence  within such thirty (30) day period
and  thereafter  proceed  diligently to cure such default  after written  notice
thereof),  then, in that event,  Landlord  shall be liable to Tenant for any and
all damages sustained by Tenant as a result of Landlord's breach.

         (b) If Landlord  shall fail to perform any covenant,  term or condition
of this Lease on Landlord's  part to be performed,  and as a consequence  of its
default,  Tenant shall recover a money judgment against Landlord,  such judgment
shall  be  satisfied  solely  out of (i)  the  proceeds  of sale  received  upon
execution  of such  judgment  levied  against the right,  title and  interest of
Landlord in the  Building and its interest in the  underlying  realty;  (ii) the
rents or other  income  from the  Building  receivable  by  Landlord;  (iii) the
consideration  received by landlord from the sale or other disposition of all or
any part of Landlord's  right,  title and interest in and to said property;  and
(iv) any condemnation awards or insurance proceeds.  It is expressly  understood
and agreed that neither Landlord nor any partner of Landlord shall be personally
liable  for  any  deficiency  if the  proceeds  of the  sale or  disposition  of
Landlord's  interest in the Building is insufficient for the payment of any such
judgment,  and Tenant shall not institute any further  action,  suit, or similar
demand against  Landlord,  or any partner of Landlord,  for or on the account of
such deficiency.  Nothing contained herein shall limit the personal liability of
Landlord or its partners for acts of gross negligence or for willful acts.

         (c) Tenant  agrees to give the holder of any  mortgage or deed of trust
encumbering  the Premises,  by registered  mail, a copy of any notice of default
served upon Landlord, provided Tenant has previously been notified in writing of
the  identity  and address of the holder of any such  mortgage or deed of trust.
Tenant further agrees that if Landlord has failed to cure any default

                                       25


giving rise to such notice  within the time period  provided  for in this Lease,
then the  holder of such  mortgage  or deed of trust  shall  have an  additional
ninety (90) days in which to cure such default or, if such  default  cannot with
the exercise or reasonable diligence be cured within such time period, then such
additional time as may be necessary  (including time to obtain possession of the
Premises by power of sale or judicial  foreclosure,  if such should be necessary
to effect a cure) if within such ninety (90) days the holder of such mortgage or
deed of trust has commenced and is diligently pursuing the remedies necessary to
cure such default.

36.      FINANCIAL AND OFFSET STATEMENTS:

         Tenant  agrees to furnish to  Landlord,  upon seven (7)  business  days
prior  written  notice,  a financial  statement  including  a balance  sheet and
statement  of income and expense for  Tenant's  last fiscal  year,  and its most
recent quarterly and year to date statement,  and Tenant shall have the right to
deliver copies of such financial statements to any person from whom Landlord has
accepted a bona fide purchase offer for Landlord's Building,  or for the purpose
of obtaining a loan to be secured by Landlord's Building.

         Tenant shall at any time,  and from time to time,  not later than seven
(7) business days  following  Landlord's  written  request  therefore,  execute,
acknowledge, and deliver to Landlord, without charge, a statement in writing, in
a form provided by Landlord,  certifying the date of commencement of this Lease,
that this  Lease is  unmodified  and in full  force and effect (or if there have
been  modifications,  that the same is in full force and effect as modified  and
stating the date of the  modifications)  and further  stating the dates to which
the Minimum Rent and other charges have been paid,  and setting forth such other
matters as may reasonably by requested by Landlord.

37.      ARBITRATION:

Except as provided  in this  paragraph,  if there  shall be any dispute  between
Tenant and Landlord with respect to the  interpretation  of this /ease,  or with
respect to any claim of liability to the other party with respect to this lease,
or with respect to any matter  arising out of the  occupation of the premises by
Tenant,  the matter shall be submitted to arbitration under the Commercial rules
of Arbitration of the American Arbitration Association, and the hearing shall be
held at San Rafael, California. In connection with such arbitration, the parties
shall  have the  right to  discovery  as set  forth in  Section  1283.05  of the
California Code of Civil  Procedure.  This provision for  arbitration  shall not
apply with respect to any action  brought by Landlord  for unlawful  detainer of
the premises.

INITIALS:



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

38.      ATTORNEY'S FEES:

         If Landlord must join in any  litigation or  arbitration  brought by or
against  Tenant in order to protect an interest of  Landlord,  or if Landlord is
joined as a party in any litigation commenced by or against Tenant, Tenant shall
pay all costs,  expenses, and attorney's fees incurred by Landlord, its managing
agent,  its  architects,  or their  insurance  carriers in connection  with such
litigation  unless such  litigation  determines  that  Landlord has  committed a
breach of this Lease and  adjudicates  that Landlord is a liable  party.  If any
action at law or in equity is brought between Landlord and Tenant

                                       26


to enforce any of the  provisions  and/or rights under this Lease,  Landlord and
Tenant hereby  expressly  waive the right,  if any, to trial by jury in order to
avoid the time delays  inherent in such  process,  and Landlord and Tenant agree
that the unsuccessful party to such litigation shall pay to the successful party
all costs and expenses,  including reasonable  attorney's fees, incurred by such
successful  party,  and if such successful  party recovers  judgment in any such
action or preceding,  such costs, expenses and attorney's fees shall be included
in and as part of such judgment.

39.      ENTIRE AGREEMENT:

         This Lease and the  Leasehold  Improvements  Agreement  constitute  the
entire agreement between Landlord and Tenant, and there are no other agreements,
oral or written,  that would modify the terms set forth in this Lease. Except as
otherwise  expressly  provided herein, any later agreement that would purport to
renew,  extend,  modify,  amend or terminate  this Lease shall be of no force or
effect unless in writing and executed by both Landlord and Tenant.

40.      HAZARDOUS MATERIALS DISCLOSURE & BROKER DISCLAIMER:

         Various construction  materials may contain items that have been or may
in the future be determined to be hazardous  (toxic) or undesirable and may need
to be specially  treated/handled or removed. For example,  some transformers and
other  electrical  components  contain  PCBs,  and  asbestos  has  been  used in
components  such  as  fire-proofing,  heating  and  cooling  systems,  air  duct
insulation  spray-on  and tile  acoustical  materials,  linoleum,  floor  tiles,
roofing,  dry wall and plaster.  Due to prior or current uses of the Property or
in the area, the Property may have hazardous or  undesirable  metals,  minerals,
chemicals,  hydrocarbons,  or biological or radioactive  items in soils,  water,
building components, above or below-ground containers or elsewhere in areas that
may or may not be accessible or noticeable.  Such items may leak or otherwise be
released. Real estate agents have no expertise in the detection or correction of
hazardous or undesirable  items.  Expert  inspections are necessary.  Current or
future laws may require  clean up by past,  present  and/or future owners and/or
operators.  It is the  responsibility  of the  Landlord  and  Tenant  to  retain
qualified  experts to detect and correct  such matters and to consult with legal
counsel of their choice to determine what  provisions,  if any, they may wish to
include in transaction documents regarding the Property.

         To the best of  Landlord's  knowledge,  no asbestos or other  hazardous
materials and undesirable substances are contained in the Property.  Landlord is
required  under  California  Health and Safety  Code  Section  25915 et seq.  to
disclose reports and surveys  regarding  asbestos to certain persons,  including
their employees, contractors,  co-owners, purchasers and tenants. Buyers/Tenants
have  similar  disclosure  obligations.  Landlord  and  Tenant  have  additional
hazardous materials  disclosure  responsibilities to each other under California
Health and Safety Code Section 25359.7 and other California  laws.  Consult your
attorney  regarding  this  matter.  The  brokers  in  this  transaction  are not
qualified  to assist you in this  matter or provide  you with other legal or tax
advice.

         LANDLORD REPRESENTS AND WARRANTS THAT TO THE BEST OF ITS KNOWLEDGE,  NO
ASBESTOS OR OTHER HAZARDOUS MATERIALS ARE OR WILL BE CONTAINED IN THE PREMISES.

                                       27


41.      MISCELLANEOUS:

         (a) The table of contents and  marginal  captions in this Lease are for
convenience  of  reference  only and  shall not in any way limit or be deemed to
construe or interpret the terms and provisions hereof.

         (b) Time is of the  essence  of this  Lease and of all its  provisions,
except with  respect to the delivery of  possession  of the  Premises,  which is
governed by paragraph 1 above.

         (c) As used herein, the words "Landlord" and "Tenant" shall include the
plural as well as the  singular.  Words used in the neuter  gender shall include
the masculine and  feminine,  as the context may require.  If there is more than
one Landlord or Tenant, the obligations imposed upon Landlord or Tenant shall be
joint and several.

         (d) This Lease shall be construed and enforced in  accordance  with the
laws of the State of California.

         (e) All acts  concerning  this Lease,  the  Premises,  or the Building,
shall be  performed  on behalf of  Landlord  only by a partner of  Landlord,  if
Landlord  is a  Partnership,  or  an  officer  of  Landlord,  if  Landlord  is a
corporation, unless written notice to the contrary is given to Tenant.

         (f) If any  provision of this Lease,  or the  application  of it to any
person or circumstances,  shall to any extent be invalid or  unenforceable,  the
remainder of this Lease, or the application of such provision to any such person
or  circumstances  other than those as to which it is invalid or  unenforceable,
shall not be  affected,  and each  provision  of this  Lease  shall be valid and
enforceable to the fullest extent permitted by law.

         (g) Landlord and Tenant acknowledge and agree that the only real estate
broker(s)  involved in the  negotiation of this Lease was were the Grubb & Ellis
Company is acting as agent for and  representing  only Landlord and not as agent
for Tenant, and Damner Pike acting as the agent for and representing only Tenant
and not as agent for Landlord.

         (h)  Tenant  acknowledges  that it is  aware  that  the  agent  for the
Landlord,  Roger  A.  Smith,  is also a  principal  in this  transaction  with a
forty-five percent (45%) ownership  interest.  Tenant further  acknowledges that
another principal in the transaction, Michael J. Smith, is a California licensed
real  estate  broker,  and Daniel  Ross is a  California  licensed  real  estate
salesperson.

         (i) This Lease  imposes  numerous  financial and other  obligations  on
Landlord and Tenant,  and each of them was urged, and had ample time, to consult
an attorney before entering this Agreement.  No representation or recommendation
is made by the Landlord, the real estate brokers or their agents or employees as
to the legal sufficiency, legal effect, or tax consequences of this lease or the
transaction  relating thereto;  the parties shall rely solely upon the advice of
their own attorneys as to the legal and tax consequences of this lease.

         (j) The persons  executing  this lease on behalf of the parties  hereby
covenant and warrant that (i) they are duly authorized by appropriate resolution
and/or the  articles and by-laws of said  corporation  to execute this Lease and
thereby bind Landlord and Tenant to all the terms and conditions  thereof,  (ii)
Tenant is a duly qualified corporation and all steps have been taken prior to

                                       28




the execution of this Lease to qualify  Tenant to do business in the state where
the Building is situated, (iii) all franchise and corporate taxes have been paid
as of the date of  execution,  (iv) all future  forms,  reports,  fees and other
documents  necessary to comply with  applicable laws will be filed when due, and
(v) Landlord is a duly existing California general partnership.

         (k) During  the entire  lease  term  Tenant  shall  maintain a business
license as required by the municipality in which the Building is located.

         (l) All agreements by Tenant contained in this Lease, whether expressed
as  covenants  or  conditions,  shall  be  construed  to be both  covenants  and
conditions,  conferring  upon  Landlord  in the event of the breach  thereof the
right to terminate this Lease.

         (m)  All  exhibits  attached  to  this  Lease  shall  be  deemed  to be
incorporated  herein by the individual  reference to each such exhibit,  and all
such exhibits  shall be deemed to be a part of this Lease as though set forth in
full herein.

42.      RIGHT TO MONTH-TO-MONTH TENANCY:

         In the event that (a) Tenant has not  exercised  an option to extend in
accordance  with the  provisions of Paragraph 32; and (b) the Note  described in
Paragraph  2(a)  has not been  repaid  or  assigned  to a third  party;  and (c)
Landlord  has been  unsuccessful  in  executing  any new leases three (3) months
prior to the expiration of the then current term of the lease, Tenant shall have
the right to remain in the premises on a month-to-month basis at 95% of the fair
rental  value of the  premises.  The fair rental  value shall be  determined  as
provided for in Paragraph  32.  Tenant must  exercise  this right in writing not
later than eighty-five (85) days prior to the expiration of the current term.

         IN WITNESS  WHEREOF,  the parties have  executed  this Lease or, as the
case may be, have caused their duly  authorized  officers to execute this Lease,
on the date last written below.

LANDLORD:                               TENANT:
111 PARTNERS                                   FAIR, ISAAC AND COMPANY,
                                               INCORPORATED

By:______________________________              By:______________________________
         Michael J. Smith

Date:____________________________              Date:____________________________


By:______________________________
          Roger A. Smith

Date:____________________________


By:______________________________
           Daniel C. Ross

Date:____________________________

                                       29



                                    EXHIBIT A
                              PROPERTY DESCRIPTION

                              111 Smith Ranch Road
                             San Rafael, California

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

ALL THAT CERTAIN  REAL  PROPERTY  situated in the City of San Rafael,  County of
Marin, State of California described as follows:

PARCEL ONE:

Parcel 3B, as shown upon that certain Parcel map entitled  "Parcel Map, Lot 3 of
Map of Smith  Ranch,  Northerly  Portion 17 R.M. 39, San Rafael,  Marin  County,
California",  filed for record  __________ in Book __________ of parcel Maps, at
Page __________, Marin County Records.

Reserving  therefrom  an  easement  for  access,  parking,  drainage  and public
utilities  over that portion of the herein  described  property lying within the
boundaries of that certain, "Mutual Access and Parking Easement, D.E. & P.U.E.",
as shown upon the filed map referred to above.

Said  easement to be  appurtenant  to and for the benefit of Parcel 3A, as shown
upon the filed map referred to above.

PARCEL TWO:

An easement for access. parking,. drainage and public utility purposes over that
portion of Parcel 3A,  lying  within the  boundaries  of that  certain,  "Mutual
Access and Parking  Easement,  D.E. &,  P.U.E.,  as said parcel and easement are
shown upon that certain Parcel Map entitled,  "Parcel Map, Lot 3 of Map of Smith
Ranch.  Northerly  Portion 17 R.M. 39, San Rafael,  Marin  County,  California",
filed  for  record  __________  in  Book  __________  of  Parcel  Maps  at  Page
__________, Marin County Records.

PARCEL THREE:

An easement for storm drainage purposes more particularly described as follows:

Beginning at the Easterly terminus of the course "South 81(degree) 38' 00" East,
536.00 feet":  said point being on the Northery line of Smith Ranch Road and the
Southerly  line of Lot 3, as shown and  delineated on that certain map entitled.
"Map of Smith Ranch - Northerly Portion",  filed for record in Book 17 of Record
Maps at Page 39, Marin County  Records:  thence  leaving said  Northerly line of
said Smith  Ranch Road (17 R.M.  39) along the  Easterly  line of said Lot 3 (17
R.M. 39) the following courses and distances;  Easterly along a tangent curve to
the left whose center bears North  8(degree) 22' 00" East,  having,  a radius of
20.00  feet,  through a central  angle of  90(degree)  00' 00", an arc length of
31.42 feet and thence North 8(degree) 22' 00" East, 23.00 feet,  thence leaving,
said  Easterly  line of said Lot 3 (17 R.M. 39) South  13(degree)  12' 17" East,
46-24 feet to said Northerly line of said Smith Ranch Road (17 R.M. 39),  thence
along said Northerly line of said Smith Ranch Road (17 R.M. 39) North 81(degree)
37' 00" West, 37.00 feet to the point of beginning.

                                       30                          Exhibit 10.13



PARCEL FOUR:

An easement for storm drainage over a strip of land 10 feet in width and being 5
feet on each side of the following described line:

Beginning at the Easterly terminus of the course "South 81(degree) 38' 00" East,
536.00 feet"; said point being on the Northerly line of Smith Ranch Road and the
Southerly  line of Lot 3, as shown and  delineated on that certain Map entitled,
"Map of Smith Ranch  Northerly  Portion",  filed for record in Book 17 of Record
Maps at Page 39, Marin County  Records;  thence  leaving said  Northerly line of
said Smith  Ranch Road (17 R.M.  39) along the  Easterly  line of said Lot 3 (17
R.M. 39) the following courses and distances;  Easterly along a tangent curve to
the left whose center  bears North  8(degree)  22' 00" East,  having a radius of
20.00  feet,  through a central  angle of  90(degree)  00' 00", an arc length of
31.42 feet,  and thence North  8(degree)  22' 00" East,  128.00 feet to the true
point of beginning; thence leaving said Easterly line of said Lot 3 (17 R.M. 39)
South  81(degree)  38' 00" East 60.00 feet to the Westerly  line of Parcel D, as
shown on said "Map of Smith Ranch  -Northerly  Portion" (17 R.M. 39),  being the
terminus of this easement.

PARCEL FIVE:

An easement for access and public utility purposes more  particularly  described
as follows:

Beginning at the Easterly terminus of the course "South 81(degree) 38' 00" East,
536.00 feet" said point being on the Northerly  line of Smith Ranch Road and the
Southerly  line of Lot 3, as shown and  delineated on that certain Map entitled,
"Map of Smith Ranch - Northerly Portion",  filed for record in Book 17 of Record
Maps at Page 39, Marin County Record; thence leaving said Northerly line of said
Smith Ranch Road (17 R.M. 39) along the Easterly line of said Lot 3 (17 R.M. 39)
the following courses and distances,  Easterly along a tangent curve to the left
whose center bears North 8(degree) 22' 00" East,  having a radius of 20.00 feet,
through a central  angle of  90(degree)  00' 00",  an arc length of 31.42  feet,
thence North 8(degree) 22' 00" East, 271.13 feet and thence  Northeasterly along
a tangent  curve to the left whose center bears North  81(degree)  38' 00" West,
having,  a radius of 670 feet.  through a central angle of 2(degree) 00' 00", an
arc length of 23.39 feet;  thence  leaving  said  Eastery line of said Lot 3 (17
R.M. 39) South 81(degree) 38' 00" East,  27.41 feet,  thence South 8(degree) 22'
00" West.  141.15 feet; thence Southerly along a tangent curve to the left whose
center  bears South  81(degree)  38' 00" East.  having a radius of 292.00  feet,
through a central  angle of  10(degree)  59' 17",  an arc length of 56.00  feet;
thence  Southerly  along a reverse curve to the right whose center bears.  South
87(degree) 22' 43" West, having a radius of 308.00 feet, through a central angle
of 10(degree)  59' 17", an arc length of 59.07 feet;  thence South  8(degree)22'
00" West,  59.00 feet to said  Northerly  line of said Smith Ranch Road;  thence
along said Northerly line of said Smith Ranch Road (17 R.M. 39) North 81(degree)
38' 00" West, 58.00 feet to the point of beginning.

                                       31



Exhibit B
- ---------

Site Plan
- ---------
111 Smith Ranch Road
San Rafael, California

Exhibit C
- ---------

Floor Plan 
- ---------- 
(Page 1 of 2)
Office Building
111 Smith Ranch Road
San Rafael, California

Exhibit C
- ---------

Floor Plan 
- ---------- 
(Page 2 of 2)
Office Building
111 Smith Ranch Road
San Rafael, California

                                       32


                                   SCHEDULE A
                         SHELL PLANS AND SPECIFICATIONS

                              111 Smith Ranch Road
                             San Rafael, California

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

1.       GENERAL PROVISIONS:

         a.       Shell plans and Specifications  shall be subject to applicable
                  governmental codes and ordinances.

         b.       The building shell shall have the approximate dimensions shown
                  on Exhibit C, Floor Plan, attached to this Lease.

         c.       All work not  described  herein  shall  be  considered  tenant
                  improvements  and shall be  constructed  by tenant as provided
                  for in the Leasehold Improvements Agreement.

         d.       The atrium/lobby,  bathrooms,  janitor  closet(s),  mechanical
                  rooms,  both  staircases  and elevator shall be completed with
                  all necessary finishes as part of the shell construction.

2.       LANDSCAPING & SITE WORK:

         To be completed in  accordance  with plans and  specifications  already
         prepared  and  submitted  to the  City of San  Rafael  by  Glanville  &
         Associates,  Oberkamper and Associates,  and Forsher & Guthrie.  Tenant
         acknowledges receipt of a copy of said plans and its approval thereof.

3.       FOUNDATIONS:

         As  required  by the  Geotechnical  Report,  101,  111 Smith Ranch Road
         (Parcel 3), San Rafael, California, dated January 11, 1991, prepared by
         Miller Pacific Engineering Group. Tenant acknowledges receipt of a copy
         of said report.

         a.       Continuous  exterior footings with isolated column footings on
                  compacted fill.

         b.       Additional   footings  may  be  required   for   architectural
                  features.

                                       33



4.       SUBSTRUCTURE:

         a.       Slab  on  grade:   Minimum  of  5"  thick,   reinforced   with
                  reinforcing  bars (not welded wire mesh) over a membrane vapor
                  barrier and above a compacted aggregate base.

5.       SUPERSTRUCTURE:

         a.       Columns,  beams and brace  frames;  tubular  steel.  Roofs and
                  Floors:  Wood  frame  of  purlins,   sub-purlins  and  plywood
                  diaphragms.

         b.       Lateral  steel brace  frames will be exposed as  necessary  on
                  both  levels.  Steel  columns will be located  along  exterior
                  window line, aligned with window mullions where feasible.

         c.       Floor has been designed for the following load conditions:

                  Live loads:               50 pounds per square foot
                           Partitions:      10 pounds per square foot

                  Deadloads:
                           Structure        13 pounds per square foot
                           Gypcrete         13 pounds per square foot
                           Misc.             4 pounds per square foot

                  TOTAL:                   100 pounds per square foot
                  ---------------------------------------------------

6.       EXTERIOR CLOSURE:

         a.       Exterior walls:  Framing:  2'x6' wood studs and/or 2'x4' metal
                  studs  and  plywood  sheathing;  Finish:  Exterior  insulation
                  finish system (Drivit or other similar system), 6" thick, with
                  a fine uniform  texture,  grey (exact color to be determined).
                  This system will provide for all required wall insulation.

         b.       Glazing:  Continuous  butt-joint  glass (at  exterior),  5'-6"
                  high,  sealed at each joint.  All frames to be Medium  Bronze,
                  anodized.  All  glazing to be tinted  light  gray and  windows
                  shall be  double  paned  on the  south  and west  sides of the
                  building.  All  doors  and  windows  at the main and  easterly
                  accesses to the building will be a storefront system, finished
                  similarly to the glazing system. The lobby glazing will not be
                  double paned.

                                       34



         c.       Light weight metal trim elements to be fabricated of aluminum,
                  painted finish.

7.       ROOFING:

         a.       Roof covering; multi-ply built-up with granular ballast.

         c.       Insulation;  roll type batt  insulation  will be  incorporated
                  between roof framing members.

8.       CONVEYING:

         a.       One  completed  hydraulic   passenger   elevator.   Must  meet
                  California Title 24 Accessibility Standards.

9.       MECHANICAL:

         a.       Plumbing;  completed men's and women's toilet rooms will be on
                  each floor. The men's room will be furnished with one handicap
                  toilet, one handicap height urinal, one standard height urinal
                  and two handicap lavatories set in a counter. The womens' room
                  will be  furnished  with one  handicap  toilet,  one  standard
                  toilet and two handicap lavatories set in a counter.

         b.       Fire  Protection:  A fire  sprinkler  system for office hazard
                  shall be installed with  distribution  and coverage  necessary
                  for shell  space and for  completed  bathrooms,  lobbies,  and
                  stairwells,  and  mechanical  room.  Said system to include an
                  alarm system as required by municipal codes.

         C.       HVAC: Multiple zone package system (Variable-air-volume). Base
                  equipment  shall be roof mounted,  and connected to utilities,
                  and  distributed to shell space. If the HVAC system is changed
                  from  these  specifications  at the  request  of  Tenant,  any
                  increased  cost  shall be  deleted  from the budget for tenant
                  improvements.

10.      ELECTRICAL:

         a.       Service and distribution;  1,600 amp service,  panel board and
                  feeders  shall be  installed.  Tenant may increase the size of
                  said  service with any  increased  cost to be deleted from the
                  budget for tenant improvements.

         b.       Special  Electrical:  Alarm systems and emergency  lighting as
                  required

                                       35


                  by codes and conditions of approval for completed shell, Cable
                  TV and telephone  conduits will be provided from  right-of-way
                  to the mechanical room.


11.      INTERIOR CONSTRUCTION:

         a.       Interior doors:  Janitor closet,  mechanical room,  bathrooms,
                  fire doors as required for shell.

         b.       Wall  finishes.  Lobby:  combination  of paint and vinyl  wall
                  covering.  Toilet  rooms:  ceramic  tile and paint.  Secondary
                  staircase:  Painted  sheet rock.  Mechanical  Room:  unpainted
                  sheetrock.

         c.       Floor  finishes:  Lobby and  secondary  exit:  combination  of
                  carpet and tile. Toilet rooms:  ceramic tile. Easterly stairs:
                  glue down commercial carpet.

         d.       Ceiling finishes.  Lobby areas and toilet rooms,  "5/8" gypsum
                  board, painted.

12.      OTHER:

         a.       Complete shell shall be left free of debris and broom clean at
                  completion by shell contractor.

                                       36




                                   SCHEDULE B
                        INTERIOR PLANS AND SPECIFICATIONS

                              111 Smith Ranch Road
                             San Rafael, California

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

Tenant shall use the standards and materials listed below in the construction of
its Tenant  Improvements:  All items not listed here shall be selected by Tenant
subject to the provisions of this Leasehold Improvements Agreement.


DOORS:                     Full height (3'0" wide), solid core, laminate finish.

HARDWARE:                  Mortise  lock  and  latches  to be  used,  with  auto
                           closures installed as required by code.

CEILING:                   Suspended T-Bar with 2'x2' or 2'x4' tiles. Grid to be
                           1" white metal.  Ceiling height to be per Shell Plans
                           and Specifications.

LIGHTS:                    Fluorescent   2'x4'  or  2'x2'   parabolic,   3  lamp
                           multi-cell fixtures with aluminum finished grid to be
                           used in general purpose office areas.

WINDOW COVERINGS:          1" metal miniblinds on exterior windows.
      

FIRE SPRINKLERS:           Semi-recessed heads with white trim.

EXCEPTIONS:                Tenant may  deviate  from the above  standards  where
                           required for special  purpose  areas of the Building,
                           for example computer rooms or lunch rooms.

FINISHES:                  Tenant may select colors finishes, material and other
                           details  ("Finishes")  regarding the final appearance
                           of  its  Tenant  Improvements,  except  Landlord  may
                           withhold its approval of said  Finishes,  as provided
                           for in Paragraph 6(b) of this Leasehold  Improvements
                           Agreement  if they are not  similar  to those used in
                           other, first class office building in Marin County.

                                       37


                                    EXHIBIT D

                        LEASEHOLD IMPROVEMENTS AGREEMENT
                        --------------------------------

                              111 Smith Ranch Road
                             San Rafael, California


                  This Leasehold  Improvements  Agreement (this  "Agreement") is
made  as of the  day  __________  of  August,  1991,  between  111  PARTNERS,  a
California  general  partnership  having an address at 50 Bon Air Center,  Suite
140,  Greenbrae,  California  94904  ("Landlord"),  and FAIR, ISAAC AND COMPANY,
INCORPORATED,  a corporation,  having an address at 120 North Redwood Drive, San
Rafael, CA 94903-1996 ("Tenant").

         1. The Lease and the  Demised  Premises.  Upon and subject to the terms
and conditions herein contained, Landlord and Tenant are entering into a "Lease"
of even date herewith (herein called the "Lease"),  whereby Landlord shall lease
to Tenant, and Tenant shall lease from Landlord,  upon and subject to the terms,
covenants,  provisions and conditions of the Lease,  certain  premises which are
commonly known as 111 Smith Ranch Road, San Rafael,  California (the "Project").
The Project consists of the Building, the landscaping and the parking area.

         2.  Construction of the Proiect.  Landlord at its sole cost and expense
agrees to commence  construction  as soon as possible and diligently to continue
construction  of the Project.  The Project shall be  constructed  by Landlord in
substantial  compliance  with the plans and  specifications  to be  prepared  by
Forsher and Guthrie, (the Shell Plans and Specifications").  The Shell Plans and
Specifications  shall  provide  for the  construction  of a first  class  office
building and shall be in accordance with the approvals heretofore granted by the
City of San Rafael. The final Shell Plans and Specifications shall be subject to
the  reasonable  approval of tenant.  Such  approval  shall not be  unreasonably
withheld or delayed.  If written  work or any  defects  therein,  nor shall such
exercise be deemed  notice of  disapproval  has not been  delivered  to Landlord
within  ten  (10)  working  days  following  delivery  of the  Shell  Plans  and
Specifications  or  within  five (5)  working  days  following  delivery  of any
proposed changes to the Shell Plans or Specifications, Tenant shall be deemed to
have approved the Shell Plans and Specifications or such change.

                  Landlord's  Work shall  consist of the  completion of the work
included in the Shell Plans and Specifications which shall include all items set
forth in Schedule "A" hereto.

         3.  Inspection  by  Tenant.   During  the  course  of  construction  of
Landlord's work, Tenant or Tenant's  representative  shall at all times have the
right to inspect the construction. 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

                                       38



work or any defects therein,  nor shall such exercise be deemed an assumption by
Tenant of any responsibility for the quality of the work.

         4.       Completion  of  Landlord's  Work and  Delivery  of the Demised
Premises.

                  (a) Substantial Completion. For purposes of the Lease and this
Leasehold Improvements  Agreement,  "substantially  complete the Building" means
completing the Building in a manner  sufficient to permit Tenant to commence and
prosecute the construction of its Tenant Improvements in a reasonably  efficient
manner.  Landlord shall be deemed to have  substantially  completed the Building
notwithstanding the fact that certain items of Landlord's work are not complete,
even if such items of  Landlord's  work may delay  certain  aspects of  Tenant's
work,  so long as  Tenant  will  have  the  ability  to  perform  its  work in a
reasonably efficient manner.

                  (b) Target  Date for  Completion.  Landlord  agrees to use its
best efforts to substantially complete the Building by April 1, 1992.

                  In the event that the  construction  activities  in connection
with  Landlord's  Work in or about the Building,  or the state of completion (or
lack thereof) of Landlord's Work in or about the Building,  results in any delay
in or interference with Tenant's work, then:

                           (i)  the  90-day  Tenant's  Construction  Period  (as
referred to in  paragraph 1 (a) of the Lease) shall be extended one day for each
day of such delay; and

                           (ii)  Landlord   shall   reimburse   Tenant  for  all
additional costs incurred as a result of such delay or interference.

                  (c)  Inquiries by Tenant as to  Progress.  Between the date of
execution  of the  Lease  and the  date  Landlord  substantially  completes  the
Building,  Landlord  agrees to respond to  inquires  from Tenant  regarding  the
progress on the Project and the estimated date of substantial completion.

                  (d)   Notice  of   Substantial   Completion.   When   Landlord
substantially  completes the Building,  Landlord  shall (i) give Tenant  written
notice  (the  "Substantial  Completion  Notice")  and (ii)  deliver  the Demised
Premises to Tenant for purposes of  constructing  its tenant  improvements.  The
fact that the balance of the Project  has not been  completed  shall not prevent
Landlord  from  delivering  the  Substantial  Completion  Notice to  Tenant  and
delivering the Demised  Premises to Tenant for the purpose of  constructing  its
tenant improvements, if Tenant and its contractors are provided reasonable means
of access to the Demised Premises.

                  (e) Delivery  Date.  The Delivery Date shall be the date which
is the  earlier  of: (i) ten (10) days after the date on which  Tenant  actually
received the Substantial

                                       39


Completion  Notice;  or,  (ii) the date upon which  Tenant  enters  the  Demised
Premises to commence the construction of its tenant improvements.

         5.       Compensation for Delay in Completion of the Building.

                  If Landlord  does not give Tenant the  Substantial  Completion
Notice  by June 1,  1992  (which  date  shall  be  subject  to  postponement  in
accordance  with the  provisions  of  paragraph 11 below)  Landlord  agrees that
Tenant shall be entitled to an additional  one (1) day of free rent for each day
beyond  June 1,  1992,  until  Landlord  has  given to  Tenant  the  Substantial
Completion  Notice.  Subject to the  provisions  of paragraph 10, such free rent
shall constitute  liquidated damages and the sole remedy of Tenant for the delay
in  possession,  and Tenant  hereby  waives any claim  against  Landlord for any
consequential  or other damages or losses  incurred by reason of any such delay.
Such free rent  shall be  applied  as soon as  possible  after the date on which
rental  otherwise  becomes  payable under the Lease.  As used in this  Leasehold
Improvements  Agreement,  the term "free rent" shall mean a  forgiveness  of the
Land Rent, as prorated on a daily basis for the period described.

         6.       Construction by Tenant of Interior Improvements.

                  (a) Construction by Tenant.  Following the Commencement  Date,
Tenant  shall  construct  its tenant  improvements  in the  Demised  Premises in
accordance with plans and  specifications to be approved by Landlord pursuant to
the  provisions  of paragraph  6(b) below and in a good and  workmanlike  manner
using new first-class materials.

                  (b) Approval of Interior  Plans and  Specifications.  Prior to
commencing  such  construction,  Tenant shall submit to Landlord for  Landlord's
approval a complete set of plans and specifications for the tenant improvements.
Landlord agrees that it will not unreasonably  withhold its approval of Tenant's
plans and  specifications  and will provide Tenant with detailed reasons for the
basis of any  objection  to  Tenant's  plans and  specifications.  Landlord  may
withhold its approval of proposed tenant improvements which could not be altered
without  substantial  expense to re-lease the Building after the  termination of
this Lease.  Notwithstanding  the  foregoing,  Landlord's  approval shall not be
withheld because such plans do not provide for corridor  separations or demising
interior walls.  The Interior Plans and  Specifications  shall include the items
set forth in  Schedule  "S"  hereto.  If  Landlord  does not respond to Tenant's
request for approval within ten (10) business days of Landlord's  receipt of the
Tenant's  plans  and  specifications  (or  any  resubmittal  of  the  plans  and
specifications), then Tenant's plans and specifications will be deemed approved.

                  (c) Approval of Contractors.  Any contractor  chosen by Tenant
to perform the Tenant improvement work shall be subject to the prior approval of
Landlord. Landlord agrees that it will not unreasonably withhold its approval of
Tenant's  contractor and will provide Tenant with specific reasons for the basis
of any objection to Tenant's

                                       40


contractor. If Landlord does not respond to Tenant's request for approval within
seven (7) business days of Landlord's  receipt of Tenant's proposed  contractor,
then  Tenant  may give to  Landlord  a written  notice  stating  the  failure of
Landlord to respond to the prior  request and further  stating  that if Landlord
does not respond to such request within three (3) business days from the receipt
by Landlord of such second notice,  then Tenant's  proposed  contractor  will be
deemed  approved.  If Landlord does not respond to such request within three (3)
business days from the receipt by Landlord of such second notice,  then Tenant's
proposed  contractor  shall be deemed  approved.  Tenant shall have the right to
submit a list of not more than six (6)  proposed  contractors  to  Landlord  for
Landlord's approval in accordance with the procedures outlined in this paragraph
6.(c).

         (d) Certain  Bidders.  Tenant agrees that, it shall give a set of plans
and specifications for the tenant improvements to Ross/Donovan  Company, and the
company  shall be given not less than ten (10)  business days in which to bid or
deliver to Tenant a proposal for constructing the tenant improvements.  However,
nothing herein shall obligate Tenant to consider such bid or negotiate with such
contractor,  it being  understood that Tenant shall have the right to select its
own  contractor  (subject only to the  limitation  set forth in paragraph  6.(c)
above)  on such  terms and in such  manner  as  Tenant in its sole and  absolute
discretion shall determine.

         (e) Control of Contractors  and Avoidance of Labor  Disputes.  Landlord
may refuse to approve a contractor or supplier if Landlord  reasonably  believes
that the  presence of such  contractor  or supplier at the Demised  Premises may
cause labor or other difficulties for Landlord or its contractors.  In the event
that Landlord  permits Tenant to enter or commence work in the Demised  Premises
prior to substantial  completion of the Building,  Tenant shall immediately take
such actions as may be necessary to resolve any labor  disputes  which may arise
by  reason  of  Tenant's  work  or the  presence  or use of its  contractors  or
suppliers  on  the  job,  including,  without  limitation,  the  removal  of any
non-union contractors or suppliers from the job.

         (f)  Inspection  by  Landlord.  During the course of  constructing  the
tenant  improvements,  Landlord or Landlord's  representative shall at all times
have the right to inspect  the  construction.  Any  inspection  by  Landlord  of
Tenant's  construction  or  improvements  shall not be deemed an  acceptance  by
Landlord of such  construction  nor shall it impose upon  Landlord any liability
whatsoever for any defects in such construction or improvements.  Landlord shall
not  be  entitled  to  charge  Tenant  any  fee  for   Landlord's   approval  or
participation  on the design and  construction  process for the  construction of
Tenant's  improvements in the Demised  Premises or any out of pocket expenses in
connection therewith.

         (g) Changes in the Interior Plans and Specifications. Tenant shall have
the right to make changes in the approved  plans and  specifications  subject to
the  limitations on alterations as set forth in paragraph 10 of the Lease and to
the right of Landlord to approve  such  modifications  in the same manner as the
original plans and specifications.

                                       41


         7.       Tenant Improvement Allowance.

                  (a) Initial  Build-out.  In connection  with Tenant's  initial
build out of the Tenant's Improvements, Landlord agrees to pay to Tenant the sum
of  $618,500  or the  cost of  Tenant's  Improvements  whichever  is the  lesser
("Tenant Improvements Allowance") to pay Tenant's architectural,  space planning
and engineering fees and for the cost of constructing  the tenant  improvements.
Landlord  shall pay to Tenant  the  Tenant  Improvement  Allowance  in  periodic
progress  payments  within  thirty  (30) days  after  delivery  to  Landlord  of
invoices, and lien releases or waivers conditional only upon payment;  provided,
however,  Tenant's  requests for progress payments shall not at any time average
more than one for each  month of  Tenant's  Construction  Period  which has then
elapsed.

                  (b)  Indemnity by Tenant.  Tenant  hereby agrees to indemnify,
defend and hold Landlord harmless from all demands,  claims, causes of action or
judgments and all reasonable expenses incurred in investigating or resisting the
same for injury to persons,  for loss of life or damage to property occurring on
the Demised  Premises  resulting  from  Tenant's  work in the  Demised  Premises
(except to the extent  such  injury,  loss of life or damage to  property is the
direct  result of the  negligence  or willfully  wrongful act of Landlord or its
agents, employees or contractors),  and Tenant agrees to provide Landlord with a
certificate  of  insurance   confirming  that  Tenant  is  maintaining  adequate
comprehensive  general public liability  insurance covering Tenant's  obligation
under this paragraph and naming Landlord as an additional insured.

         8. Storage of  Materials by Tenant.  Tenant may request in writing that
Landlord permit Tenant to store  construction  materials in the Demised Premises
prior to the  delivery  by  Landlord  to  Tenant of the  Notice  of  Substantial
Completion. The request by Tenant shall set forth the nature and quantity of the
materials  which Tenant  wishes to store and may state the  location  within the
Demised  Premises where Tenant suggests that such materials be stored.  Landlord
shall permit Tenant to store such  materials in the Demised  Premises if, in the
reasonable  opinion of Landlord and Landlord's  contractor,  the storage of such
materials  will not present a material  inconvenience  to Landlord or Landlord's
contractor  or any  subcontractor  in the  completion  of the work  required  of
Landlord by this Leasehold Improvements Agreement. In the event that the storage
of such materials would present such a material inconvenience, then Landlord may
refuse to permit  Tenant to store such  materials.  In the event  that  Landlord
permits the materials to be stored in the Demised Premises, Landlord may specify
the location within the Demised Premises where the materials may be stored,  and
may  later and from time to time  require  that  Tenant  move the  materials  to
another  location within the Demised  Premises at the expense of Tenant,  should
such a move be required for the  convenience  of  Landlord's  contractor  or any
subcontractor, and Tenant shall promptly cause such materials to be moved within
the Demised  Premises to the new location  specified  by Landlord.  In the event
that Tenant does store materials in the Demised  Premises prior to the giving by
Landlord of the Notice of Substantial Completion, Tenant shall indemnify, defend
and hold Landlord  harmless from: (i) all demands,  claims,  causes of action or
judgments and

                                       42


all  reasonable  expenses  incurred in  investigating  or resisting the same for
injury to persons, for loss of life or damage to property occurring arising from
or in  connection  with Tenant's  storage of materials in the Demised  Premises;
and, (ii) the effects of any mechanics or other liens or claims which may attach
to the Project or be claimed  against  Landlord by reason of the storage of such
materials in the Demised Premises.

         9. Project  Completion.  Notices of Completion  and Defects.  Following
delivery of the Demised  Premises to Tenant for the purposes of constructing its
tenant improvements,  Landlord agrees to diligently continue with the completion
of Landlord's  Work in accordance  with this Leasehold  Improvements  Agreement.
Tenant  shall  not be  required  to  commence  its  business  activities  in the
Premises,  nor shall  any  rental  obligations  commence  under the lease  until
Landlord's Work has been completed.

                  In the event Landlord has not completed Landlord's Work thirty
(30) days  after  Tenant  has  completed  its  Tenant  Improvements,  subject to
postponement in accordance with the provisions of paragraph 11 of this Leasehold
Improvements  Agreement,  Landlord  agrees that  Tenant  shall be entitled to an
additional  one (1) day of free rent for each day beyond  said  thirty  (30) day
period, until Landlord has given to Tenant the Final Completion Notice.  Subject
to the provisions of paragraph 10 of this Leasehold Improvements Agreement, such
free rent shall constitute  liquidated damages and the sole remedy of Tenant for
the delay in possession, and Tenant hereby waives any claim against Landlord for
any  consequential  or other  damages or losses  incurred  by reason of any such
delay.  Such free rent shall be applied  as soon as  possible  after the date on
which  rental  otherwise  becomes  payable  under  the  Lease.  As  used in this
Leasehold Improvements Agreement,  the term "free rent" shall mean a forgiveness
of the Land Rent, as prorated on a daily basis for the period described.

                  Upon the  completion of Landlord's  Work,  Landlord shall give
Tenant written notice of such completion (the "Final  Completion  Notice"),  and
Tenant shall be deemed to have fully accepted  Landlord's 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 Landlord's
Work, except to the extent that:

                  (i) Tenant  shall  furnish  Landlord  with a list (the  "Punch
List")  within  thirty  (30)  days  after  the  receipt  by  Tenant of the Final
Completion  Notice,  which Punch List shall  specify  the items of  construction
which have not been completed, and

                  (ii) Tenant shall  furnish  Landlord  with a list (the "Defect
List")  within one (1) year the date of receipt of the Final  Completion  Notice
specifying  any  defects  in the  construction  of  Landlord's  Work  which were
discovered prior to the end of such one (1) year period.

                  Landlord shall  promptly  undertake and complete the repair of
each of the items on the Punch List and the Defect List,  except those,  if any,
which do not have a material  adverse affect upon the use,  appearance or safety
of the Demised

                                       43


Premises  by Tenant.  Nothing in this  paragraph  9 shall be deemed to affect or
limit  the  obligations  of  Landlord  to  repair  or  maintain  the  structural
components or any other portions of the Buildings  which Landlord is required to
repair or maintain under the provisions of the Lease.

         10.      Termination.

                  In the event that a grading  permit for grading of the site is
not issued by September 15, 1991, or in the event  substantial Site Work has not
commenced  by October 15, 1991,  or in the event that a building  permit for the
construction  of the  Building is not issued by December  31,  1991,  Tenant may
terminate all of the  obligations  under this Agreement and the Lease by written
notice to Landlord  delivered within five (5) days thereafter.  If the permit is
not issued or if  construction  is not  commenced  by such dates,  and if Tenant
elects to  terminate  this Lease,  the  obligations  of the  parties  under this
Agreement and the Lease shall terminate.

         11.      Delays.

                  (a)  Tenant  Caused  Delays.  If a delay  shall  occur  in the
substantial completion of construction as the result of:

                           (i)  any   delay   of   Tenant   in   approving   any
modifications to the Shell Plans or  Specifications  submitted to Tenant for its
approval;

                           (ii) any  request by Tenant that  Landlord  delay any
element, or the completion, of construction;

                           (iii) any request for a change by Tenant in the Shell
Plans  and  Specifications  or the  plans  and  specifications  for  the  tenant
improvements;

                           (iv)  any   breach  or   default  by  Tenant  in  the
performance  of  Tenant's   obligations   under  the  Lease  or  this  Leasehold
Improvements Agreement;

                           (v) any  interference  by  Tenant  or its  agents  or
contractors with the prosecution by Landlord of its 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 paragraph
11. (a); then:

                                       44


                                    a.  any  such   delay  in  the   substantial
completion of construction shall extend all dates for the completion by Landlord
of ail or any part of its work by one (1) day for each day of such delay;

                                    b. Tenant shall  reimburse  Landlord  within
thirty (30) days from demand for all  reasonable  additional  costs  incurred by
Landlord as a result of such delays (including,  without  limitation,  increased
design costs, increased construction costs and increased financing costs arising
by reason of the resulting delays, if any, in the construction schedule); and,

                                    c. the  Delivery  Date and the  Commencement
Date 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.  Landlord  shall  notify  Tenant in  writing of the
existence of any of the above delays of which Landlord has knowledge  within ten
(10)  business  days  after the event  causing  the  commencement  of such delay
occurs.  In the event that Landlord fails to give such a notice to Tenant within
ten (10) business days of the  commencement of such delay,  then the delay shall
be deemed to have  commenced  on the date upon  which  such  notice is  actually
given.  Landlord shall use Landlord's  reasonable efforts to minimize the length
of any such delay.

                  (b) Other Delays.  In the event that Landlord shall be delayed
in or prevented from the performance of any act by reason of strikes,  lockouts,
unusual delays in transportation, unavailability of materials, acts or omissions
of  contractors  and   subcontractors,   failure  or  unavailability  of  power,
unavailability of fuel,  restrictive  governmental laws or regulations,  fire or
other casualty, inclement weather, riots, insurrections, the act, failure to act
or default of the other  party,  war or other reason  beyond its  control,  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 Landlord.

         12.  Disputes.  Any dispute  arising  under this  Agreement  (including
without  limitation  any dispute as to the cost or  duration of a Tenant  Caused
Delay) shall be determined by  arbitration in accordance  with the  construction
arbitration rules of the American Arbitration Association.

         13.  Notices.  Any notice or other  communication  which  either  party
hereto shall desire or be required to give  pursuant to the  provisions  of this
Leasehold  Improvements  Agreement  shall be given and  deemed  received  in the
manner provided in Article 19 of the Lease.

                                       45


         14.      Assignment.

                  (a) By Tenant.  This Agreement and Tenant's  rights  hereunder
shall  not be  assigned  by  Tenant  except to a  permitted  assignee  of ail of
Tenant's rights under the Lease,  and any other  purported  assignment by Tenant
shall be null and void and of no force and effect.

                  (b)  By  Landlord.   This  Agreement  and  Landlord's   rights
hereunder  shall not be assigned by Landlord except to a successor to Landlord's
title to the Project and any other  purported  assignment  by Landlord  shall be
null and void  and of no force  and  effect;  provided,  however,  that  nothing
contained in this Section shall apply to nor restrict  Landlord  from  executing
and delivering any collateral  assignment,  pledge or security interest which is
granted in connection with any financing secured by a lien against the Project.

                  (c) Written Agreement. If a party shall duly assign its rights
hereunder,  the assignee  shall  execute,  acknowledge  and deliver to the other
party an agreement in form and substance  reasonably  satisfactory  to the other
party whereby the assignee shall assume the obligations of this Agreement on the
part of the assignor to be performed or observed.

         15.      Waiver of Certain Remedies.

                  (a) No Offset.  No sum  payable to Tenant as the result of any
breach or default by Landlord  under this  Agreement  shall be deducted  from or
offset  against any minimum rent or additional  rent or other sums payable under
the Lease,  and no such breach or default by Landlord under this Agreement shall
excuse Tenant from the performance of any of its obligations  under the Lease or
relieve  Tenant  of  any  of  its  liabilities   thereunder.   Nothing  in  this
subparagraph  (a)  shall be  deemed to  affect  any  express  right of Tenant to
terminate  the  Lease  in  accordance  with  the  provisions  of this  Leasehold
Improvements Agreement.

                  (b) No  Consequential  Damages.  Any  failure by  Landlord  to
complete  the  Project  shall  not give  rise to any claim or cause of action or
remedy other than as set forth in this Leasehold Improvement  Agreement.  Tenant
waives all claims  for  consequential  or other  damages  arising  from any such
failure.

         16.      Limitation on Landlord Liability.

                  (a) Basic Limitation. Except as otherwise provided in below in
this  paragraph  16, if  Landlord  shall fail to perform any  covenant,  term or
condition of this  Leasehold  Improvements  Agreement on  Landlord's  part to be
performed,  and as a  consequence  of its default,  Tenant shall recover a money
judgment against Landlord, such judgment shall be satisfied solely out of:

                                       46


                           (i) the proceeds of sale received  upon  execution of
such judgment  levied  against the right,  title and interest of Landlord in the
Project;

                           (ii)  the  rents  or other  income  from the  Project
receivable (but not received) by Landlord;

                           (iii) the consideration received by Landlord from the
sale or other  disposition  of all or any part of  Landlord's  right,  title and
interest in and to the Project; and,

                           (iv) any  condemnation  awards or insurance  proceeds
receivable in respect of the Project.

                  (b) No Personal  Liability.  It is  expressly  understood  and
agreed that neither Landlord nor any employee or partner in or of Landlord shall
be  personally  liable  for  any  deficiency  if the  proceeds  of the  sale  or
disposition  of  Landlord's  interest  in the  Project is  insufficient  for the
payment of any such judgment, and Tenant shall not institute any further action,
suit,  or  similar  demand  against  Landlord,  or any  employee  or  partner of
Landlord,   for  or  on  the   account  of  such   deficiency.   The   foregoing
notwithstanding,  Tenant  may seek to  recover  any  consideration  received  by
Landlord  from the sale or other  disposition  of all or any part of  Landlord's
right, title and interest in and to said property and any condemnation awards or
insurance proceeds  thereafter  received by Landlord or any partner of Landlord,
provided  that any action to recover such proceeds is commenced by the filing of
a complaint and the service of summons within ninety (90) days of the receipt by
Tenant of actual notice of a sale or disposition of the Project by Landlord.

                  (c) Effect of Limitation.  The  limitations  set forth in this
paragraph 16 shall not apply to Tenant's right to recover  liquidated damages as
provided in paragraph 5 above.

         17.  Conflicts  and  Conformity  with Lease.  To the extent  which this
Agreement  fails to provide the rights and  obligations  of Landlord  and Tenant
relative  to any  matter,  the rights and  obligations  of  Landlord  and Tenant
relative to such matters  shall be governed by the Lease.  If there shall be any
conflict  between this Agreement and the Lease, the provisions of this Agreement
shall prevail.

         18.  Attorney  Fees.  Each party shall pay to the other all amounts for
costs,  including,  but not limited  to, the other  party's  attorneys  fees and
amounts paid to any collection agency, or reasonably incurred by the other party
in  connection  with any breach or default  beyond  applicable  grace and notice
periods  by the first  party  under this  Leasehold  Improvements  Agreement  or
incurred  in  order  to  enforce  the  terms  or  provisions  of this  Leasehold
Improvements Agreement. Such amounts shall be payable within thirty (30) days of
demand.  In addition,  if any action shall be instituted  by either  Landlord or
Tenant for the enforcement or interpretation of any of its rights or remedies in

                                       47


or under this Lease,  the prevailing party shall be entitled to recover from the
losing party all costs incurred by the  prevailing  party in said action and any
appeal therefrom,  including  reasonable attorneys fees and costs to be fixed by
the court or  arbitrators  therein.  In the event  Landlord  or Tenant is made a
party to any  litigation  between the other party and any third party,  then the
other party shall pay all costs and  attorneys  fees incurred by or imposed upon
the first party in connection with such litigation;  provided,  however,  if the
first  party is  ultimately  held to be  liable,  then  the  first  party  shall
reimburse the other party for the cost of any  attorneys  fees paid by the other
party on behalf of the first party.

         19.  Waiver.  Waiver by a party of any breach of any term,  covenant or
condition contained in this Leasehold Improvements Agreement shall not be deemed
to be a waiver of such term,  covenant or condition or of any subsequent  breach
of the same or of any other  term,  covenant,  or  condition  contained  in this
Agreement.  A party's consent to, or approval of, any act shall not be deemed to
render  unnecessary  the obtaining of a party's  consent to, or approval of, any
subsequent  act by the other party.  The  acceptance by a party of rent or other
sums  payable  under the Lease by the other party in amounts less than that owed
by the other  party  shall not be deemed a waiver of the  amounts  not paid or a
waiver of any other breach or default under this  Agreement or the Lease,  other
than  failure  of the  other  party to pay the  particular  rent or other sum so
accepted,  regardless of the first party's knowledge of such preceding breach at
the time of acceptance of such rent, or sum equivalent to rent.

         20.  Captions.  The  captions  of  the  paragraphs  of  this  Leasehold
Improvements  Agreement are for convenience of reference only, are not a part of
this  Leasehold  Improvements  Agreement,  and shall not be deemed in any way to
define or limit the terms and provisions of the paragraph to which they refer.

         21.  Governing  Law. This  Leasehold  Improvements  Agreement  shall be
construed and enforced in accordance with the laws of the State of California.

         22. Miscellaneous Matters.

                  (a)  Covenants  and  Conditions.  The  covenants of Tenant set
forth  in this  Leasehold  Improvements  Agreement  shall be  deemed  also to be
conditions.

                  (b)  Relationship  of  Landlord  and  Tenant.  Nothing in this
Leasehold  Improvements  Agreement  shall be deemed or  construed  as creating a
partnership,  joint  venture  or  agency  between  Tenant  and  Landlord  or any
relationship between them other than that of landlord and tenant.

                                       48


         IN WITNESS  WHEREOF,  the parties have entered into this agreement upon
the date above written.

LANDLORD:                                   TENANT:

111 PARTNERS                                FAIR, ISAAC AND COMPANY, INC.


By:________________________________         By:_________________________________
        Michael J. Smith

Date:______________________________         Date:_______________________________

By:________________________________
          Roger A. Smith

Date:______________________________

By:________________________________

Date:______________________________

                                       49



                                   SCHEDULE A
                         SHELL PLANS AND SPECIFICATIONS

                              111 Smith Ranch Road
                             San Rafael, California

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

1.       GENERAL PROVISIONS:

         a.       Shell plans and Specifications  shall be subject to applicable
                  governmental codes and ordinances.

         b.       The building shell shall have the approximate dimensions shown
                  on Exhibit C, Floor Plan, attached to this Lease.

         c.       All work not  described  herein  shall  be  considered  tenant
                  improvements  and shall be  constructed  by tenant as provided
                  for in the Leasehold Improvements Agreement.

         d.       The atrium/lobby,  bathrooms,  janitor  closet(s),  mechanical
                  rooms,  both  staircases  and elevator shall be completed with
                  all necessary finishes as part of the shell construction.

2.       LANDSCAPING & SITE WORK:

         To be completed in  accordance  with plans and  specifications  already
         prepared  and  submitted  to the  City of San  Rafael  by  Glanville  &
         Associates,  Oberkamper and Associates,  and Forsher & Guthrie.  Tenant
         acknowledges receipt of a copy of said clans and its approval thereof.

3.       FOUNDATIONS:

         As  required  by the  Geotechnical  Report,  101,  111 Smith Ranch Road
         (Parcel 3), San Rafael, California, dated January 11, 1991, prepared by
         Miller Pacific Engineering Group. Tenant acknowledges receipt of a copy
         of said report.

         a.       Continuous  exterior footings with isolated column footings on
                  compacted fill.

         b.       Additional   footings  may  be  required   for   architectural
                  features.

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4.       SUBSTRUCTURE:

         a.       Slab  on  grade:   Minimum  of  5"  thick,   reinforced   with
                  reinforcing  bars (not welded wire mesh) over a membrane vapor
                  barrier and above a compacted aggregate base.

5.       SUPERSTRUCTURE:

         a.       Columns,  beams and brace  frames;  tubular  steel.  Roofs and
                  Floors:  Wood  frame  of  purlins,   sub-purlins  and  plywood
                  diaphragms.

         b.       Lateral  steel brace  frames will be exposed as  necessary  on
                  both  levels.  Steel  columns will be located  along  exterior
                  window line, aligned with window mullions where feasible.

         c.       Floor has been designed for the following load conditions:

                  Live loads:                        50 pounds per square foot
                           Partitions:               10 pounds per square foot

                  Deadloads:
                           Structure                 13 pounds per square foot
                           Gypcrete                  13 pounds per square foot
                           Misc.                      4 pounds per square foot
                  TOTAL:                            100 pounds per square foot
                  ------------------------------------------------------------

6.       EXTERIOR CLOSURE:

         a.       Exterior walls:  Framing:  2'x6' wood studs and/or 2'x4' metal
                  studs  and  plywood  sheathing;  Finish:  Exterior  insulation
                  finish system (Drivit or other similar system), 6" thick, with
                  a fine uniform  texture,  grey (exact color to be determined).
                  This system will provide for all required wall insulation.

         b.       Glazing:  Continuous  butt-joint  glass (at  exterior),  5'-6"
                  high,  sealed at each joint.  All frames to be Medium  Bronze,
                  anodized.  All  glazing to be tinted  light  gray and  windows
                  shall be  double  paned  on the  south  and west  sides of the
                  building.  All  doors  and  windows  at the main and  easterly
                  accesses to the building will be a storefront system, finished
                  similarly to the glazing system. The lobby glazing will not be
                  double paned.

                                       51


         c.       Light weight metal trim elements to be fabricated of aluminum,
                  painted finish.

7.       ROOFING:

         a.       Roof covering; multi-ply built-up with granular ballast.

         b.       Insulation;  roll type batt  insulation  will be  incorporated
                  between roof framing members.

8.       CONVEYING:

         a.       One  completed  hydraulic   passenger   elevator.   Must  meet
                  California Title 24 Accessibility Standards.

9.       MECHANICAL:

         a.       Plumbing;  completed men's and women's toilet rooms will be on
                  each floor. The men's room will-be furnished with one handicap
                  toilet, one handicap height urinal, one standard height urinal
                  and two handicap lavatories set in a counter. The womens' room
                  will be  furnished  with one  handicap  toilet,  one  standard
                  toilet and two handicap lavatories set in a counter.

         b.       Fire  Protection:  A fire  sprinkler  system for office hazard
                  shall be installed with  distribution  and coverage  necessary
                  for shell  space and for  completed  bathrooms,  lobbies,  and
                  stairwells,  and  mechanical  room.  Said system to include an
                  alarm system as required by municipal codes.

         c.       HVAC: Multiple zone package system (Variable-air-volume). Base
                  equipment  shall be roof mounted,  and connected to utilities,
                  and  distributed to shell space. If the HVAC system is changed
                  from  these  specifications  at the  request  of  Tenant,  any
                  increased  cost  shall be  deleted  from the budget for tenant
                  improvements.

10.      ELECTRICAL:

         a.       Service and distribution;  1,600 amp service,  panel board and
                  feeders  shall be  installed.  Tenant may increase the size of
                  said  service with any  increased  cost to be deleted from the
                  budget for tenant improvements.

         b.       Special  Electrical:  Alarm systems and emergency  lighting as
                  required

                                       52


                  by codes and conditions of approval for completed shell. Cable
                  TV and telephone  conduits will be provided from  right-of-way
                  to the mechanical room.


11.      INTERIOR CONSTRUCTION:

         a.       Interior doors:  Janitor closet,  mechanical room,  bathrooms,
                  fire doors as required for shell.

         b.       Wall  finishes.  Lobby:  combination  of paint and vinyl  wall
                  covering.  Toilet  rooms:  ceramic  tile and paint.  Secondary
                  staircase:  Painted  sheet rock.  Mechanical  Room:  unpainted
                  sheetrock.

         c.       Floor  finishes:  Lobby and  secondary  exit:  combination  of
                  carpet and tile. Toilet rooms:  ceramic tile. Easterly stairs:
                  glue down commercial carpet.

         d.       Ceiling finishes.  Lobby areas and toilet rooms,  "5/8" gypsum
                  board, painted.

12.      OTHER:

         a.       Complete shell shall be left free of debris and broom clean at
                  completion by shell contractor.

                                       53