EXHIBIT 10.38

                           ADDENDUM TO THAT CERTAIN
                                 CERTAIN LEASE
                              DATED JULY 29, 1999
                                 BY AND BETWEEN
                       ASP SCRIPPS, L.L.C. ("LESSOR") AND
                      THE KEITH COMPANIES, INC. ("LESSEE")

          Any language contained within this Addendum shall supersede any
conflicting language within the body of the Lease.

49.  Notwithstanding Paragraph 1.3 of the Lease, the Lessor retains the right to
     cancel this Lease by providing Lessee with at least six months written
     notice prior to the effective date of said cancellation (the "Cancellation
     Date"). Said right of cancellation may be exercised if and only if the
     lessee under that certain lease between Canon Computer System, Inc., a
     California corporation, as lessee (the "Expansion Lessee"), and Lessor. as
     lessor, dated May 21, 1993 (the "Expansion Lease"), validly exercises its
     right to lease the Premises pursuant to the Expansion Lease. Lessor hereby
     agrees that the Cancellation Date shall be within the period which is
     thirty (30) days prior to the date that Lessor is to deliver the Premises
     to the Expansion Lessee. In any event, the earliest date for the
     Cancellation Date is August 27, 2000.

50.  Notwithstanding Paragraph 2.4, Acceptance of Premises, Lessee acknowledges
     to Lessor that it accepts the Premises in its "as-is" condition, except as
     specifically provided otherwise in this Lease. Lessor acknowledges that
     Lessee currently has an amount equal to Eighteen Thousand Eight Hundred
     Sixty-Three and 59/100 Dollars ($18,863.59) (the "Allowance") in the
     aggregate available for the costs incurred by Lessee to construct Lessee-
     Owned Alterations and/or Utility Installations in the Premises. Lessor
     shall disburse the Allowance in accordance with Lessor's standard
     disbursement procedure, which procedure includes, without limitation, the
     requirements that (a) Lessee deliver to Lessor (i) invoices marked as
     having been paid for work performed and materials delivered in connection
     with the Lessee-Owned Alterations and/or Utility Installations, and (ii)
     properly executed mechanics lien releases in compliance with California
     Civil Code Section 3262(d)(2) and either Section 3262(d)(3) or Section
     3262(d)(4), (b) Lessor has determined that no substandard work exists which
     adversely affects the mechanical, electrical, plumbing, heating,
     ventilating and air conditioning, life-safety or other systems of the
     Building, the curtain wall of the Building, the structure or exterior
     appearance of the Building, or any other lessee's use of such other
     lessee's leased premises in the Building and (c) Lessee's architect, if
     applicable, delivers to Lessor a certificate, in a form reasonably
     acceptable to Lessor, certifying that the construction of the Lessee-Owned
     Alterations and/or Utility Installations in the Premises has been
     completed, and (d) any other documentation reasonably requested by Lessor.
     Any Lessee-Owned Alterations and/or Utility Installations proposed by
     Lessee shall be subject to Paragraph 7.3 of the Lease.

51.  Notwithstanding Paragraph 12 of the Lease, as a condition to giving
     Lessor's consent to an assignment or sublease, which condition the parties
     hereby agree is reasonable, Lessee shall pay to Lessor any "Transfer
     Premium," as that term is defined hereinbelow, received by Lessee in
     connection with any such assignment or sublease. "Transfer Premium" shall
     mean all base rent, additional rent or other consideration payable by such
     assignee, sublessee or other transferee in excess of the Base Rent and all
     other rent and charges, including but not limited to Common Area Operating
     Expenses and Real Property Taxes, payable by Lessee under this Lease on a
     per rentable square foot basis if less than all of the Premises is
     transferred, after deducting the reasonable expenses incurred by Lessee for
     (i) changes, alterations and improvements to the Premises in connection
     with such transfer (ii) brokerage commissions in connection with such
     transfer, and (iii) free


     base rent reasonably provided in connection with the transfer. The Transfer
     Premium shall also include, but not be limited to, key money, bonus money
     or other cash consideration paid by such assignee, sublessee or other
     transferee to Lessee in connection with such transfer, and any payment in
     excess of fair market value for services rendered by Lessee to such
     assignee, sublessee or other transferee or for assets, fixtures, inventory,
     equipment or furniture transferred by Lessee to such assignee, sublessee,
     or other transferee in connection with such transfer. The determination of
     the amount of the Transfer Premium shall be made on a monthly basis as rent
     or other consideration is received by Lessee in connection with the
     transfer.

52.  Pursuant to Paragraph 34 of the Lease, Lessee shall be entitled to keep its
     current building signage, provided the Lease is not cancelled pursuant to
     the terms of this Lease and Lessee remains in possession of at least 45,000
     square feet of the 2955 Red Hill Building. In any event, Lessee shall be
     responsible to remove said sign(s) and repair any and all damage to the
     Building caused by such removal, when vacating the Premises.

53.  Notwithstanding Paragraph 2.3 of the Lease to the contrary, Lessor shall
     comply with all laws, statutes, ordinances or other governmental rules,
     regulations or requirements in force as of the Commencement Date
     (collectively, "Applicable Laws") relating to the "Base Building," as that
     term is defined hereinbelow, and the Common Areas, provided such compliance
     is not the responsibility of the Lessee under this Lease, and further
     provided that Lessor's failure to comply therewith would (a) prohibit
     Lessee from (i) obtaining or maintaining a certificate of occupancy for the
     Premises, or (ii) obtaining a building permit from the City of Costa Mesa
     Department of Building and Safety for Alterations proposed by Lessee, which
     Alterations have otherwise been approved by Lessor and are for general
     office use (not for Lessee's particular use of the Premises for non-general
     office use), or would unreasonably and materially affect the safety of
     Lessee's employees or create a significant health hazard for Lessee's
     employees. Lessee, at its sole cost and expense, shall comply with all such
     Applicable Laws in force as of the Commencement Date which relate to (i)
     Lessee's use of the Premises for non-general office use, (ii) the
     Alterations, Utility Installations, or presently existing tenant
     improvements in the Premises, or (iii) the Base Building, but as to the
     Base Building, only to the extent such obligations are triggered by
     Lessee's Alterations, Utility Installations, or tenant improvements which
     are related to Lessee's particular use of the Premises for other than
     general office use, or Lessee's use of the Premises for non-general office
     use. Lessor shall be permitted to include in Common Area Operating Expenses
     any costs or expenses incurred by Lessor hereunder, but only to the extent
     consistent with the terms of Paragraph 4.2 of this Lease. The "Base
     Building" shall include the structural portions of the Building and the
     public restrooms and the systems and equipment located in the internal core
     of the Building on the floor or floors on which the Premises are located.

54.  Pursuant to Paragraph 1.6(b) the project, commonly known as Scripps Center
     consists, of three (3) freestanding buildings totaling 229,226 square feet.

55.  Paragraph 30 (30.1 and 30.2) shall be replaced by the following:

     SUBORDINATION AND ATTORNMENT: Lessee acknowledges that this Lease is
     subject and subordinate to all leases in which Lessor is lessee and to any
     mortgage or deed of trust now in force against the Building and to all
     advances made or hereafter to be made thereunder, or any amendments or
     modifications thereof, and shall be subordinate to any future leases in
     which Lessor is lessee and to any future mortgage or deed of trust
     hereafter in force against the Building and to all advances made or
     hereafter to be made thereunder (all such existing and future leases,
     mortgages and deeds of trust referred to collectively as "Superior
     Instruments"). Lessee also agrees that if the holder of any Superior
     Instrument

                                      -2-


     elects to have this Lease superior to its Superior Instrument and gives
     notice of its election to Lessee, then this Lease shall be superior to the
     lien of any such lease, mortgage or deed of trust and all renewals,
     replacements and extensions thereof, whether this Lease is dated before or
     after such lease, mortgage or deed of trust. If requested in writing by
     Lessor or any first mortgagee or ground lessor of Lessor, Lessee agrees to
     execute a subordination agreement required to further affect the provisions
     of this paragraph. Lessor shall provide Lessee with a subordination, non-
     disturbance and attornment agreement in substantially the form attached
     hereto as Exhibit C from Lessor's presently existing lender holding a first
     deed of trust on the Building.

     In the event of any transfer in lieu of foreclosure or termination of a
     lease in which Lessor is lessee or the foreclosure of any Superior
     Instrument, or sale of the Property pursuant to any Superior Instrument,
     Lessee shall attorn to such purchaser, transferee or lessor and recognize
     such party as Lessor under this Lease, provided such party acquires and
     accepts the Premises subject to this Lease. The agreement of Lessee attorn
     contained in the immediately preceding sentence shall survive any such
     foreclosure sale or transfer.

56.  4.2(a)(ix) The cost of any capital improvements or other costs (I) which
     are intended as a labor-saving device or to effect other economies in the
     operation or maintenance of the Building or any portion thereof to the
     extent of the reduction in Common Area Operating Expenses reasonably
     anticipated by the Lessor at the time of such expenditure to be incurred in
     connection therewith, or (II) made to the Building after the Commencement
     Date that are required under any governmental law or regulation, except for
     capital improvements or costs to remedy a condition existing as of the
     Commencement Date which a federal, state or municipal governmental
     authority, if it had knowledge of such condition as of the Commencement
     Date, would have then required to be remedied pursuant to governmental laws
     or regulations in their form existing as of the Commencement Date;
     provided, however, that any such capital expenditure shall be amortized
     (including interest on the unamortized cost) over its reasonable useful
     life.

     Notwithstanding the foregoing, except as set forth in item (ix), above, the
costs of capital repairs and alterations shall not, for purposes of this Lease,
be included in Operating Expenses.

57.  4.2(e) Within one (1) year after receipt of a Statement by Lessee, if
     Lessee disputes the amount of Common Area Operating Expenses set forth in
     the Statement, an independent certified public accountant (which accountant
     is a member of a regionally recognized accounting firm, has previous
     experience in reviewing financial operating records of lessors of office
     buildings, and is retained by Lessee on a non-contingency fee basis),
     designated and paid for by Lessee, may, after reasonable notice to Lessor
     and at reasonable times, inspect Lessor's records with respect to the
     Statement at Lessor's offices, provided that Lessee is not then in default
     under this Lease and Lessee has paid all amounts required to be paid under
     the applicable Estimated Statement and Statement, as the case may be. In
     connection with such inspection, Lessee and Lessee's agents must agree in
     advance to follow Lessor's reasonable rules and procedures regarding
     inspections of Lessor's records, and shall execute a commercially
     reasonable confidentiality agreement regarding such inspection. Lessee's
     failure to dispute the amount of Common Area Operating Expenses set forth
     in any Statement within one (1) year following Lessee's receipt of such
     Statement shall be deemed to be Lessee's approval of such Statement and
     Lessee, thereafter, waives the right or ability to dispute the amounts set
     forth in such Statement. If after such inspections, Lessee still disputes
     such Common Area Operating Expenses, a determination as to the proper
     amount shall be made, at Lessee's expense, by an independent certified
     public accountant (the "Accountant") selected by Lessor and subject to
     Lessee's reasonable approval; provided that if such certification by the
     Accountant proves that Common Area Operating Expenses were overstated by
     more than five percent

                                      -3-


     (5.0%), then the cost of the Accountant and the cost of such determination
     certification shall be paid for by Lessor. Any reimbursement amounts
     determined to be owing by Lessor to Lessee or by Lessee to Lessor shall be
     (i) in the case of amounts owing from Lessee to Lessor, paid within thirty
     (30) days following such determination, and (ii) in the case of amounts
     owing from Lessor to Lessee, credited against the next payments of Base
     Rent due Lessor under the terms of this Lease, or if the Term has expired,
     paid to Lessee within thirty (30) days following such determination. In no
     event shall this Paragraph 57 be deemed to allow any review of any of
     Lessor's records by any sublessee of Lessee. Lessee agrees that this
     Paragraph 57 shall be the sole method to be used by Lessee to dispute the
     amount of any Common Area Operating Expenses payable or not payable by
     Lessee pursuant to the terms of this Lease, and Lessee hereby waives any
     other rights at law or in equity relating thereto.

58.  Notwithstanding anything in Paragraph 7.3(b) to the contrary, for purposes
     of the original Lessee named in this Lease (the "Original Lessee") only,
     Lessor may (but without the obligation to do so) condition its consent to
     any requested Alteration or Utility Installation that costs $25,000.00 or
     more upon Lessee's providing Lessor with a lien and completion bond in an
     amount equal to one and one-half times the estimated cost of such
     Alteration or Utility Installation.

59.  12.1(c) Notwithstanding the provisions of this Paragraph 12 or elsewhere
     in the Lease, Lessee may assign or sublet the Premises without Lessor's
     consent, to any entity which controls, is controlled by, or is under common
     control with Lessee, or to any corporation or entity resulting from the
     merger or consolidation with Lessee, or to any person or entity which
     acquires all or substantially all of the assets of Lessee as a going
     concern of the business that is being conducted on the Premises, or in
     connection with an initial public offering of Lessee or Lessee's
     subsequently going private (collectively, "Affiliates"); provided that (i)
     said assignee or sublessee shall assume in full the obligations of Lessee
     under this Lease, (ii) Lessor shall be given a minimum of ten (10) days
     prior written notice of such transaction, (iii) Lessee promptly supplies to
     Lessor any documents or information reasonably requested by Lessor
     regarding such assignment or sublease or such affiliate (excluding any
     documentation regarding the economic terms of the merger or sale
     transaction, but including documentation regarding the assignment or
     subletting), and (iv) such assignment or sublease is not a subterfuge by
     Lessee to avoid its obligations under this Lease. Any such assignment,
     subletting or transfer shall not, in any way, affect or limit the liability
     of Lessee under the terms of this Lease, unless Lessor specifically
     releases the original named Lessee from said liability. "Control," as used
     in this Paragraph 12.1(c), shall mean the possession, directly or
     indirectly, of the power to direct or cause the direction of the management
     and policies of a person or entity, whether by ownership of voting
     securities, by contract, or otherwise.

60.  Notwithstanding anything in this Paragraph 13.4 to the contrary, with
     regards to the first late payment only, if any, by Lessee during the Term,
     Lessor shall provide to Lessee a one time written notice (the "Late
     Notice") that the installment of rent or other sum due from Lessee has not
     been received by Lessor, and if such sum is not received by Lessor from
     Lessee within five (5) business days of such Late Notice, then, without any
     requirement for any further notice to Lessee, Lessee shall pay to Lessor a
     late charge as set forth in Paragraph 13.4.

61.  Rent Abatement.  Notwithstanding anything in this Lease to the contrary, in
     --------------
     the event that Lessee is prevented from using, and does not use, the
     Premises or any portion thereof, as a result of (i) any repair, maintenance
     or alteration performed by Lessor, or which Lessor failed to perform after
     the Lease Commencement Date and required by this Lease, which substantially
     interferes with Lessee's use of the Premises, or (ii) any failure of Lessor
     to provide any services, utilities or access to the Premises, or (ii) any
     failure of Lessor to provide an services, utilities or access to the
     Premises (either such set of circumstances set forth in items (i) or (ii)
     above, to be known as an "Abatement Event"), then Lessee shall give Lessor
     notice of

                                      -4-


     such Abatement Event, and if such Abatement Event continues for three (3)
     consecutive business days after Lessor's receipt of any such notice (the
     "Eligibility Period"), then the Base Rent and Lessee's Share of Common Area
     Operating Expenses and Lessee's obligation to pay for parking shall be
     abated or reduced, as the case may be, after expiration of the Eligibility
     Period for such time that Lessee continues to be so prevented from using,
     and does not use, the Premises or a portion thereof, in the proportion that
     the rentable area of the portion of the Premises that Lessee is prevented
     from using, and does not use, bears to the total rentable area of the
     Premises. If, however, Lessee reoccupies any portion of the Premises during
     such period, the rent allocable to such reoccupied portion, based on the
     proportion that the rentable area of such reoccupied portion of the
     Premises bears to the total rentable area of the Premises, shall be payable
     by Lessee from the date Lessee reoccupies such portion of the Premises.
     Such right to abate Base Rent and Lessee's Share of Common Area Operating
     Expenses shall be Lessee's sole and exclusive remedy at law or in equity
     for an Abatement Event. Except as provided in this Paragraph 61, nothing
     contained herein shall be interpreted to mean that Lessee is excused from
     paying rent due hereunder.

62.  Right of First Offer. Lessor hereby grants to the Original Lessee and its
     --------------------
     Affiliates an ongoing right of first offer with respect to any space
     located on the ground floor of the Building which is not part of the
     Premises (the "First Offer Space"). Notwithstanding the foregoing, such
     first offer right of Lessee shall be subordinate to the expansion rights of
     the Expansion Lessee set forth in the Expansion Lease (the "Expansion
     Rights"), regardless of whether such expansion rights are executed strictly
     in accordance with their terms, or pursuant to a lease amendment or a new
     lease (the "Superior Right Holder") with respect to such First Offer Space.
     Lessee's right of first offer shall be on the terms and conditions set
     forth in this Paragraph 62.
                   ------------

     62.1 Procedure for Offer. Lessor shall notify Lessee (the "First Offer
          -------------------
     Notice") from time to time when the First Offer Space or any portion
     thereof becomes available for lease to third parties, subject to the rights
     of the Superior Right Holder. Pursuant to such First Offer Notice, Lessor
     shall offer to lease to Lessee the then available First Offer Space. The
     First Offer Notice shall describe the space so offered to Lessee and shall
     set forth the "First Offer Rent," as that term is defined in Paragraph 62.3
                                                                            ----
     below, and the other economic terms upon which Lessor is willing to lease
     such space to Lessee.

     62.2 Procedure for Acceptance. If Lessee wishes to exercise Lessee's right
          ------------------------
     of first offer with respect to the space described in the First Offer
     Notice, then within five (5) business days of delivery of the First Offer
     Notice to Lessee, Lessee shall deliver notice to Lessor of Lessee's
     intention to exercise its right of first offer with respect to the entire
     space described in the First Offer Notice on the terms contained in such
     notice. If Lessee does not so notify Lessor within the five (5) business
     day period, then Lessor shall be free to lease the space described in the
     First Offer Notice to anyone to whom Lessor desires on any terms Lessor
     desires. Notwithstanding anything to the contrary contained herein, Lessee
     must elect to exercise its right of first offer, if at all, with respect to
     all of the space offered by Lessor to Lessee at any particular time, and
     Lessee may not elect to lease only a portion thereof.

     62.3 First Offer Space Rent. The rent payable by Lessee for the First Offer
          ----------------------
     Space (the "First Offer Rent") shall be equal to the rent (including
     additional rent), including all escalations, at which lessees, as of the
     "First Offer Commencement Date," as that term is defined in Paragraph 62.5,
                                                                           ----
     below, are leasing non-sublease, non-encumbered, non-equity, non-renewal
     space comparable in size, location and quality to the First Offer Space for
     a similar lease term, which comparable space is located in the Industrial
     center, taking into consideration the following concessions (the "First
     Offer Concessions"): (a) rental abatement concessions, if

                                      -5-


     any, being granted such lessees in connection with such comparable space,
     (b) tenant improvements or allowances provided or to be provided for such
     comparable space, taking into account, and deducting the value of, the
     existing improvements in the First Offer Space, such value to be based upon
     the age, quality and layout of the improvements and the extent to which the
     same could be utilized by a general office user, and (c) any period of
     rental abatement, if any, granted to lessees in comparable transactions in
     connection with the design, permitting and construction of tenant
     improvements in such comparable spaces; provided, however, that in
     calculating the First Offer Rent, no consideration shall be given to the
     fact that Lessor is or is not required to pay a real estate brokerage
     commission in connection with Lessee's lease of the First Offer Space or
     the fact that Lessor is or is not paying real estate brokerage commissions
     in connection with such comparable space. If there are not a sufficient
     number of deals with a comparable lease term at which lessees as of the
     First Offer Commencement Date are leasing comparable space in the
     Industrial Center, then Lessor shall look at deals in the Industrial Center
     at which lessees as of the First Offer Commencement Date are leasing
     comparable space for a period of five (5) years, and the Concessions shall
     be prorated on a fractional basis, with the numerator being the number of
     months of the term of Lessee's lease of the First Offer Space, and the
     denominator being the number of months in the term of those leases upon
     which the determination of the First Offer Rent is being based.

     62.4 Construction In First Offer Space. Lessee shall take the First Offer
          ---------------------------------
     Space in its "as is" condition, and the construction of improvements in the
     First Offer Space shall comply with the terms of Paragraph 7 of this Lease.

     62.5 Amendment to Lease. If Lessee timely exercises Lessee's right to lease
          ------------------
     the First Offer Space as set forth herein, Lessee shall within fifteen (15)
     days after receipt of an amendment to this Lease from Lessor, execute the
     same, which amendment shall be upon the terms and conditions as set forth
     in the First Offer Notice and this Paragraph 62. Lessee shall commence
                                        ------------
     payment of rent for the First Offer Space, and the term of Lessee's lease
     of the First Offer Space shall commence upon the date of delivery of the
     First Offer Space to Lessee (the "First Offer Commencement Date") and shall
     expire coterminously with the expiration or earlier termination of this
     Lease.

     62.6 Termination of Right of First Offer. The rights contained in this
          -----------------------------------
     Paragraph 62 shall be personal to the Original Lessee and its Affiliates,
     ------------
     and may only be exercised by the Original Lessee and/or its Affiliates (and
     not any other assignee, sublessee or transferee of the Original Lessee's
     interest in the Lease) if the Original Lessee and/or its Affiliates
     occupies the entire Premises. Lessee shall not have the right to lease
     First Offer Space, as provided in this Paragraph 62, if, as of the date of
     the attempted exercise of any right of first offer by Lessee, or, at
     Lessor's option, as of the scheduled date of delivery of such First Offer
     Space to Lessee, Lessee is in default under this Lease beyond the
     applicable cure period provided in the Lease or Lessee has previously been
     in default under this Lease beyond the applicable cure period provided in
     this Lease more than once.

63.  Option Term.
     -----------

     63.1 Option Right. Lessor hereby grants to the Original Lessee and/or its
          ------------
     Affiliates one (1) option to extend the Original Term for this Lease
     through October 30, 2003 (the "Option Term"), which option shall be
     exercisable only by written notice delivered by Lessee to Lessor as
     provided below, provided that, as of the date of delivery of such notice,
     Lessee is not in default under this Lease beyond any applicable cure period
     set forth in the Lease, and Lessee has not previously been in default under
     this Lease beyond any applicable cure period set forth in the Lease more
     than once. Notwithstanding the foregoing, this option right shall be
     subordinate to the Expansion Rights of the Superior Right Holder,
     regardless of whether such rights are executed strictly in accordance with
     their

                                      -6-


     terms, or pursuant to a lease amendment or a new lease. Upon the proper
     exercise of such option to extend, and provided that, at Lessor's option,
     as of the end of the Original Term, Lessee is not in default under the
     Lease beyond any applicable cure period set forth in the Lease, and Lessee
     has not previously been in default under the Lease beyond any applicable
     cure period set forth in the Lease more than once, the Original Term, as it
     applies to the Premises, shall be extended through October 30, 2003. The
     rights contained in this Paragraph 63 shall be personal to the Original
     Lessee and its Affiliates and may only be exercised by the Original Lessee
     and/or its Affiliates (and not any other assignee, sublessee or transferee
     of the Original Lessee's interest in the Lease) if the Original Lessee
     and/or its Affiliates occupies the entire Premises.

     63.2 Option Rent. The rent payable by Lessee during the Option Term (the
          -----------
     "Option Rent") shall be equal to the rent, including all escalations, at
     which lessees, as of the commencement of the Option Term, are leasing non-
     sublease, non-encumbered, non-equity, non-renewal space comparable in size,
     location and quality to the Premises for a similar lease term, which
     comparable space is located in the Industrial Center, taking into
     consideration the following concessions (the "Concessions"): (a) rental
     abatement concessions, if any, being granted such lessees in connection
     with such comparable space, (b) tenant improvements or allowances provided
     or to be provided for such comparable space, taking into account, and
     deducting the value of, the existing improvements in the Premises, such
     value to be based upon the age, quality and layout of the improvements and
     the extent to which the same could be utilized by a general office user,
     and (c) all other reasonable monetary concessions being granted such
     lessees in connection with such comparable space; provided, however, that
     in calculating the Option Rent, no consideration shall be given to (i) the
     fact that Lessor is or is not required to pay a real estate brokerage
     commission in connection with Lessee's exercise of its right to lease the
     Premises during the Option Term or the fact that landlords are or are not
     paying real estate brokerage commissions in connection with such comparable
     space, and (ii) any period of rental abatement, if any, granted to lessees
     in connection with such comparable transactions in connection with the
     design, permitting and construction of tenant improvements in such
     comparable spaces. If there are not a sufficient number of deals with a
     comparable lease term at which lessees as of the commencement date of the
     Option Term are leasing comparable space in the Industrial Center, then
     Lessor shall look at deals in the Industrial Center at which lessees as of
     the commencement date of the Option Term are leasing comparable space for a
     period of five (5) years, and the Concessions shall be prorated on a
     fractional basis, with the numerator being the number of months of the
     Option Term, and the denominator being the number of months in the term of
     those leases upon which the determination of the Option Rent is being
     based.

     [The remainder of this page intentionally left blank]

                                      -7-


     63.3 Exercise of Options. The option contained in this Paragraph 63 shall
          -------------------
     be exercised by Lessee, if at all, only in the following manner: Lessee
     shall deliver written notice to Lessor not more than ten (10) months nor
     less than nine (9) months prior to the expiration of the Original Term,
     stating that Lessee is interested in exercising its option; (ii) Lessor,
     after receipt of Lessee's notice, shall deliver notice (the "Option Rent
     Notice") to Lessee not less than seven (7) months prior to the expiration
     of the Original Term, setting forth the Option Rent; and (iii) if Lessee
     wishes to exercise such option, Lessee shall, on or before the earlier of
     (A) the date occurring six (6) months prior to the expiration of the
     Original Term, and (B) the date occurring thirty (30) days after Lessee's
     receipt of the Option Rent Notice, exercise the option by delivering
     written notice thereof to Lessor.

     The Lease and this Addendum may be executed in counterparts, each of which
shall be deemed an original, but all of which, together, shall constitute one
and the same instrument.

                      AGREED & ACCEPTED:

"LESSOR"                           "LESSEE"

ASP SCRIPPS, L.L.C.                THE KEITH COMPANIES, INC.

By:  /s/ SCOTT R. FITZGERALD       By:  /s/ ERIC C. NIELSEN
     -------------------------          ----------------------
Its: Vice President                Its: President
     -------------------------          ----------------------



                                   By:  /s/ GARY CAMPANARO
                                        ----------------------
                                   Its: Secretary
                                        ----------------------

                                      -8-