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                                                               EXHIBIT 10.13

                               IXIA COMMUNICATIONS

                             SUBSCRIPTION AGREEMENT

Ixia Communications
4505 Las Virgenes Road
Suite 209
Calabasas, CA  91302

        The undersigned ("Purchaser") understands that Ixia Communications, a
California corporation (the "Company"), proposes to offer and sell to Purchaser
100,000 shares of its Common Stock (the "Shares") set forth on the signature
page hereof for the aggregate purchase price of $85,000.00, payable in the form
of cash or a check made payable to the Company.

        Accordingly, Purchaser hereby agrees with the Company as follows:

                                    SECTION 1
                           SUBSCRIPTION FOR SECURITIES

        Subject to the terms and conditions hereof and upon acceptance of this
subscription by the Company, Purchaser hereby irrevocably subscribes to
purchase, and the Company will issue and sell to Purchaser, the Shares for the
aggregate purchase price of $85,000.00 (the "Purchase Price"). The Company has
the right to reject all or any portion of Purchaser's subscription.

                                    SECTION 2
                                CLOSING; DELIVERY

        2.1 CLOSING. Purchaser subscribes for the Shares being purchased
hereunder by executing and delivering to the Company, at the address set forth
above, this Subscription Agreement and the Purchase Price, and the closing and
the issuance of the Shares (the "Closing" and the date thereof the "Closing
Date") shall occur as soon as practicable following the Company's acceptance of
such subscription and on such date as shall be determined by the Company. The
Purchase Price shall be paid in the form of cash or a check made payable to the
Company, and by accepting and executing this Subscription Agreement, the Company
agrees to accept such payment as payment in full of the Purchase Price.

        2.2 DELIVERY. At the Closing, in consideration for the Purchase Price,
the Company will issue the Shares and deliver to the Secretary of the Company to
hold in escrow in accordance with Section 6.6 hereof a certificate or
certificates registered in Purchaser's name representing the Shares purchased
hereunder by Purchaser.

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                                    SECTION 3
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

        3.1 ORGANIZATION AND STANDING. The Company is a corporation duly
organized and existing under, and by virtue of, the laws of the State of
California and is in good standing under such laws. The Company has the
requisite corporate power to own and operate its properties and assets and to
carry on its business as presently conducted and as proposed to be conducted.

        3.2 CORPORATE POWER. The Company will have, upon acceptance and
execution of this Subscription Agreement and at the Closing Date, all requisite
corporate power to execute and deliver this Subscription Agreement, to sell and
issue the Shares hereunder and to carry out and perform its obligations under
the terms of this Subscription Agreement. At the Closing Date, the Shares shall
be duly authorized, validly issued, fully paid and non-assessable.

        3.3 AUTHORIZATION. All corporate action on the part of the Company, its
directors and shareholders necessary for the authorization, execution, delivery
and performance of this Subscription Agreement by the Company, the
authorization, sale, issuance and delivery of the Shares and the performance of
the Company's obligations hereunder has been taken or will be taken prior to the
Closing. This Subscription Agreement, when executed and delivered by the
Company, will constitute a valid and binding obligation of the Company
enforceable in accordance with its terms, subject to laws of general application
relating to specific performance, injunctive relief or other equitable remedies.

                                    SECTION 4
                   REPRESENTATIONS AND WARRANTIES OF PURCHASER

        Purchaser hereby represents and warrants as follows:

        4.1 INVESTMENT. Purchaser is acquiring the Shares for investment for
Purchaser's own account and not with the view to, or for resale in connection
with, any distribution, assignment or resale within the meaning of the
Securities Act of 1933, as amended (the "Securities Act"), to others, and no
other person has a direct or indirect beneficial interest, in whole or in part,
in such Shares. Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption from the registration
provisions of the Securities Act, which exemption depends upon, among other
things, the bona fide nature of the investment intent as expressed herein.

        4.2 RELATIONSHIP TO COMPANY; SOPHISTICATION. Purchaser (i) has a
preexisting business or personal relationship with the Company and/or one or
more of its officers, directors or controlling persons or (ii) by reason of
Purchaser's business or financial experience or the business or financial
experience of Purchaser's personal representative(s), if any, who are
unaffiliated with and who are not compensated by the Company or any affiliate or
selling agent of the Company, directly or indirectly, has the capacity to
protect Purchaser's own interests in connection with Purchaser's acquisition of
the Shares.

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        4.3 RESTRICTIONS ON TRANSFER. Purchaser acknowledges that the Shares
must be held indefinitely unless subsequently registered under the Securities
Act or the Company receives an opinion of counsel satisfactory to the Company
that such registration is not required. Purchaser is aware of the provisions of
Rule 144 promulgated under the Securities Act which permit limited resale of
"restricted securities" acquired, directly or indirectly, from the issuer
thereof (or from an affiliate of such issuer) in a non-public offering, subject
to the satisfaction of certain conditions, including, among other things, the
existence of a public market for the stock, the availability of certain current
public information about the Company, the resale occurring not less than one
year after a party has purchased and made full payment for, within the meaning
of Rule 144, the securities to be sold, the sale being through a "broker's
transaction" or in transactions directly with a "market maker" and the number of
shares of the stock being sold during any three-month period not exceeding
specified limitations; provided, however, that if the seller is not an affiliate
of the issuer and has held the securities for at least two years after payment
therefor, certain of the foregoing conditions under Rule 144 may not be
applicable. Purchaser further acknowledges and understands that the Company may
not be satisfying the current public information requirement of Rule 144 at the
time Purchaser wishes to sell the Shares; and, if so, Purchaser would be
precluded from selling the Shares under Rule 144 even if the one-year minimum
holding period had been satisfied.

        4.4 NO PUBLIC MARKET. Purchaser understands that no public market now
exists for the Shares, that there can be no assurance that a public market will
ever exist for the Shares and that the Company is under no obligation to
register the Shares.

        4.5 EXEMPTION FROM REGISTRATION. Purchaser further acknowledges that, in
the event all of the requirements of Rule 144 are not met, compliance with
Regulation A under the Securities Act or some other registration exemption will
be required; and that, although Rule 144 is not exclusive, the staff of the
Commission has expressed its opinion that persons proposing to sell private
placement securities other than in a registered offering and other than pursuant
to Rule 144 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, that such
persons and the brokers who participate in the transactions do so at their own
risk, and that, therefore, there is no assurance that any exemption from
registration under the Securities Act will be available or, if available, will
allow Purchaser to dispose of, or otherwise transfer, all or any portion of the
Shares.

        4.6 CERTAIN DISPOSITION REQUIREMENTS. Without in any way limiting
Purchaser's covenants, representations and warranties set forth herein,
Purchaser further agrees that he shall in no event make any disposition of all
or any portion of the Shares unless and until:

                (i) There is then in effect a registration statement under the
        Securities Act covering such proposed disposition and such disposition
        is made in accordance with said registration statement; or

                (ii) Purchaser shall have (x) notified the Company of the
        proposed disposition and furnished the Company with a detailed statement
        of the circumstances

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        surrounding the proposed disposition, and (y) furnished the Company with
        an opinion of his own counsel to the effect that such disposition will
        not require registration of such shares under the Securities Act, and
        such opinion of his counsel shall have been concurred in by counsel for
        the Company and the Company shall have advised Purchaser of such
        concurrence.

        4.7 ACCESS TO DATA. Purchaser has had an opportunity to discuss the
Company's business, management and financial affairs with the Company's
management and the opportunity to review the Company's facilities and books and
records.

        4.8 EXPERIENCE. Purchaser and/or Purchaser's personal representative(s)
have such knowledge and experience in financial, tax and business matters so as
to enable Purchaser and/or them to utilize the information made available to
Purchaser and/or them in connection with the offering of the Shares, to evaluate
the merits and risks of the prospective investment and to make an informed
investment decision with respect thereto. Each personal representative, if any,
of Purchaser, in connection with Purchaser's investment in the Shares, has
confirmed in writing the specific details of any and all past, present or future
relationships, actual or contemplated, between Purchaser or Purchaser's
affiliates and the Company or any of the Company's affiliates.

        4.9 PURCHASER'S LIQUIDITY. Purchaser (i) has adequate means of providing
for Purchaser's current needs and possible personal contingencies, (ii) has no
need for liquidity in Purchaser's investment, (iii) is able to bear the
substantial economic risks of an investment in the Shares for an indefinite
period and (iv) at the present time, can afford a complete loss of such
investment. Purchaser's commitment to investments which are not readily
marketable is not disproportionate to Purchaser's net worth and Purchaser's
investment in the Shares will not cause Purchaser's overall commitment to become
excessive.

        4.10 OFFER AND SALE. Purchaser understands that the sale of the Shares
has not been registered under the Securities Act in reliance upon an exemption
therefrom. Purchaser was not offered or sold the Shares, directly or indirectly,
by means of any form of general solicitation or general advertisement, including
the following: (i) any advertisement, article, notice or other communication
published in any newspaper, magazine or similar medium or broadcast over
television or radio; or (ii) any seminar or other meeting whose attendees had
been invited by general solicitation or general advertising.

        4.11 RISKS. Purchaser is experienced in evaluating and investing in high
risk, high technology companies such as the Company and by reason of Purchaser's
business and financial experience has the capacity to protect Purchaser's own
interests in connection with the acquisition of the Shares and has the ability
to bear the economic risk of Purchaser's investment. Purchaser is aware that an
investment in the Shares is highly speculative and that there can be no
assurance as to what return, if any, there may be on such investment. Purchaser
is aware that the Company may issue additional securities in the future which
could result in the dilution of Purchaser's ownership interest in the Company.

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        4.12 RELIANCE. Purchaser has relied only upon the information provided
to Purchaser in writing by the Company, or information from books and records of
the Company. No oral representations have been made or oral information
furnished to Purchaser or Purchaser's advisor(s) in connection with the offering
of the Shares which were not contained therein or were inconsistent therewith.

        4.13 INVESTOR INFORMATION. All information which Purchaser has provided
to the Company concerning Purchaser, Purchaser's investor status, financial
position and knowledge and experience in financial and business matters, or, in
the case of a corporation, partnership, trust or other entity, the knowledge and
experience in financial and business matters of the person making the investment
decision on behalf of such entity, is correct and complete as of the date set
forth herein, and if there should be any adverse change in such information
prior to this subscription being accepted, Purchaser will immediately provide
the Company with such information.

        4.14 INVESTOR STATUS. Purchaser represents and warrants that Purchaser
either (i) is an "accredited investor," as that term is defined in Rule 501 of
Regulation D as promulgated under the Securities Act, and hereby agrees to
furnish such further assurances of such status as may be reasonably requested by
the Company or (ii) has a net worth (exclusive of housing, furnishing and
automobiles) of at least $200,000. Purchaser, if an individual, is at least 21
years of age.

        4.15 INVESTMENT ENTITY. Purchaser, if a corporation, partnership, trust
or other entity, is authorized and otherwise duly qualified to purchase and hold
the Shares, such entity has its principal place of business as set forth on the
signature page hereof and such entity has not been formed for the specific
purpose of acquiring the Shares.

                                    SECTION 5
                        CONDITIONS TO CLOSING OF COMPANY

        The Company's obligation to sell and issue the Shares at the Closing is
subject to the fulfillment or waiver by the Company of the following conditions:

        5.1 REPRESENTATIONS AND WARRANTIES. The representations and warranties
made by Purchaser in Section 4 hereof shall be true and correct when made and
shall be true and correct on the Closing Date as if made on and as of such
Closing Date.

        5.2 BLUE SKY LAW COMPLIANCE. The Company shall have obtained all
necessary blue sky law permits and qualifications for the offer and sale of the
Shares required by any state in which any Purchaser resides.

        5.3 CONSENTS AND WAIVERS. The Company shall have obtained any and all
consents and waivers necessary or appropriate for consummation of the
transactions contemplated by this Agreement.

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                                    SECTION 6
                            LAPSING REPURCHASE RIGHT
                           AND RIGHT OF FIRST REFUSAL

        6.1 LAPSING REPURCHASE RIGHT.

            (a) Lapsing Repurchase Right. If Purchaser ceases to serve as an
employee of the Company for any reason, including death or permanent and total
disability (within the meaning of Section 22(e)(3) of the Internal Revenue Code
of 1986, as amended (the "Code")), then the Company shall have the right, in its
sole discretion, to repurchase (referred to herein as the "Lapsing Repurchase
Right") from Purchaser or Purchaser's personal representative, as the case may
be, at a price of $0.85 per Share all or any portion of the Shares that have not
yet vested pursuant to Section 6.1(c) below. The Company may exercise the
Lapsing Repurchase Right at any time within 180 days after the last day of
Purchaser's employment by the Company.

            (b) Exercise of Lapsing Repurchase Right. The Lapsing Repurchase
Right shall be exercised by written notice signed by an officer of the Company
and delivered to Purchaser or Purchaser's representative, as the case may be, in
accordance with Section 8.5 hereof. The repurchase price shall be payable, at
the Company's option, in cash, by check or by the cancellation of any
outstanding indebtedness of Purchaser to the Company under the Note or
otherwise, or any combination thereof.

            (c) Vesting of the Shares. The Shares vest as follows: 25,000 of the
Shares shall vest on September 30, 2000 and the remaining 75,000 shares shall
vest in 12 equal quarterly installments, with the first installment vesting on
December 31, 2000 and one additional installment vesting on the last day of each
of the 11 calendar quarters thereafter, provided that on each vesting date
Purchaser has not then terminated his continuous employment with the Company;
provided, however, that in the event that at any time before the Shares are
fully vested either the Company terminates Purchaser's employment for any reason
other than "for cause" (as defined in Section 6.1(d)) or Purchaser terminates
his employment for "good reason" (as defined in Section 6.1(e)), all of the
unvested Shares shall on the date of termination of Purchaser's employment with
the Company vest and no longer be subject to the Lapsing Repurchase Right.

            (d) Definition of "For Cause." For purposes of Section 6.1(c), the
termination of Purchaser's employment "for cause" shall mean termination as a
result of:

                (i) death or long-term disability;

                (ii) a course of persistent conduct amounting to gross
        incompetence;

                (iii) any absence (excluding vacations, illnesses or leaves of
        absence) from work for more than ten consecutive work days or chronic
        absences from work (also excluding vacations, illnesses or leaves of
        absence), all of which are neither authorized, justified nor excused;

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                (iv) willful and persistent refusal or failure, after multiple
        explicit written notices and reasonable time to comply, to perform
        material, appropriate duties or to follow important Company policies;

                (v) refusal, after explicit multiple written notices and
        reasonable time to comply, to obey any lawful resolution of the
        Company's Board of Directors;

                (vi) embezzlement or other unlawful appropriation of property or
        other asset of the Company or unlawful appropriation of a corporate
        opportunity of the Company;

                (vii) offer, payment, solicitation or acceptance of any unlawful
        bribe or kickback with respect to the Company's business;

                (viii) indictment or conviction of Purchaser for or the entering
        of a plea of nolo contendere with respect to any felony whatsoever or
        for any misdemeanor involving moral turpitude;

                (ix) any act or failure to act by Purchaser that is widely
        reported in the general or trade press or otherwise and which achieves a
        general notoriety and which act or failure to act involves conduct that
        is illegal or generally considered immoral or scandalous;

                (x) any intentional material breach of Purchaser's obligations
        to the Company under any nondisclosure or proprietary agreement with or
        on behalf of the Company or any material unauthorized disclosure of any
        important and confidential information of the Company; or

                (xi) unlawful use (including being under the influence) or
        possession of illegal drugs on the Company's premises.

        (e) Definition of "Good Reason." For purposes of Section 6.1(c), "good
reason" means, without the written consent of Purchaser:

                (i) a reduction in Purchaser's annual base salary as in effect
        on the date hereof;

                (ii) the Company requiring Purchaser to be based for one month
        or more at a Company office more than 30 miles from the Company's
        offices as of the date hereof except for required and appropriate travel
        on the Company's business to an extent substantially consistent with
        Purchaser's business travel obligations as of the date hereof;

                (iii) the assignment to Purchaser of duties significantly
        inconsistent with his position in the Company as of the date hereof or a
        significantly adverse change

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        in the nature or status of Purchaser's responsibilities or the
        conditions of Purchaser's employment from those in effect as of the date
        hereof;

                (iv) the failure by the Company to continue in effect any
        compensation or benefit plan or perquisites in which Purchaser
        participates as of the date hereof, which plan or perquisites are
        material to Purchaser's total compensation, unless an at least equally
        beneficial arrangement (embodied in an ongoing, substitute or
        alternative plan) has been made with respect to such plan or
        perquisites, or the failure by the Company to continue Purchaser's
        participation therein (or in such ongoing, substitute or alternative
        plan) on a basis at least as favorable, both in terms of the amount of
        benefits provided and the level of Purchaser's participation relative to
        comparably situated participants, as exist on the date hereof; or

                (v) the failure by the Company to continue to provide Purchaser
        with benefits substantially similar to those enjoyed by Purchaser under
        any of the Company's life insurance, medical, dental, accident or
        disability plans in which Purchaser is participating as of the date
        hereof or the taking of any action by the Company which would directly
        or indirectly materially reduce any of such benefits.

        (f) Restrictions on Shares Subject to Lapsing Repurchase Right. In
addition to, and not in lieu of, such other restrictions or limitations that may
apply to the transfer or other disposition of the Shares by virtue of this
Subscription Agreement or applicable securities laws, Purchaser may not sell,
assign, transfer or hypothecate or in any other way dispose of any Shares if
such Shares are subject to the Lapsing Repurchase Right, without the express
written waiver of the Lapsing Repurchase Right by the Company with respect to
such Shares and the Company's prior written consent, to be given or withheld in
its sole discretion, to such sale, assignment, transfer, hypothecation or other
disposition.

        6.2 RIGHT OF FIRST REFUSAL.

        (a) Before any Shares registered in the name of Purchaser may be sold or
transferred (including transfer by operation of law), such Shares shall first be
offered to the Company at the same price, and upon the same terms (or terms as
similar as reasonably possible), in the following manner:

                (i) Purchaser shall deliver a notice (a "Notice") to the Company
        stating (A) Purchaser's bona fide intention to sell or transfer such
        Shares, (B) the number of such Shares to be sold or transferred, (C) the
        price for which Purchaser proposes to sell or transfer such Shares, and
        (D) the name of the proposed purchaser or transferee.

                (ii) Within 30 days after receipt of the Notice, the Company or
        its assignee may elect to purchase any or all Shares to which the Notice
        refers, at the price per share and on the same terms (or terms as
        similar as reasonably possible) specified in the Notice.

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                (iii) If all or a portion of the Shares to which the Notice
        refers are not elected to be purchased pursuant to Section 6.2(a)(ii)
        hereof, Purchaser may sell the Shares not purchased by the Company to
        any person named in the Notice at the price and terms specified in the
        Notice or at a higher price, provided that such sale or transfer is
        consummated within 60 days of the date of said Notice to the Company
        and, provided further, that any such sale is in accordance with all the
        terms and conditions hereof.

In the event of any transfer by operation of law or other involuntary transfer
(including, but not limited to, by will or by the laws of descent or
distribution) where there is no price established as a matter of law, the
Company shall have the right to repurchase all of the Shares purchased by
Purchaser hereunder, at a per Share price equal to the greater of (i) $0.85 or
(ii) the fair market value per share ("FMV per Share") as determined in good
faith by the Board of Directors of the Company (the "Board") after taking into
consideration all relevant factors. In such event, Purchaser (or Purchaser's
estate) shall notify the Company promptly after the happening of the event
giving rise to the involuntary transfer. Within 30 days after receipt of such
notice, the Company or its assignee, subject to Section 6.2(b) below, may elect
to purchase any or all Shares to which the notice refers.

        (b) In the event that Purchaser (or Purchaser's estate) does not agree
with the Board's determination of the FMV per Share and Purchaser (or
Purchaser's estate) and the Board are unable to agree mutually on the FMV per
Share within ten days from the date on which notice of the Board's determination
under the last paragraph of Section 6.2(a) is delivered to Purchaser (or
Purchaser's estate), then the FMV per Share will be determined by one or more
Qualified Appraisers (as defined below) selected in accordance with the
procedures in this Section. If the FMV per Share is to be determined by
Qualified Appraisers, then Purchaser (or Purchaser's estate) and the Company
will each have the opportunity to appoint, at his or its own expense, a
Qualified Appraiser, within five days following the expiration of the ten-day
period within which the Purchaser (or Purchaser's estate) and the Company could
not mutually agree on the FMV per Share. If either party shall fail to appoint a
Qualified Appraiser within this five-day period, then the other Qualified
Appraiser shall unilaterally establish the FMV per Share by a written opinion.
If both parties appoint Qualified Appraisers within this five-day period, these
two Qualified Appraisers shall establish the FMV per Share in a single written
opinion agreed to by both of them. If these two Qualified Appraisers cannot
agree on the FMV per Share within 30 days of the appointment of the latter of
them, these two Qualified Appraisers shall together appoint a third Qualified
Appraiser whose sole written opinion shall establish the FMV per Share. Any
action to be taken by the Company under this Section 6.2 shall be taken by the
Board, except that Purchaser (or Purchaser's estate) shall not vote, as a
director or shareholder of the Company, and either directly or through an agent
or subordinate, with respect to such actions. If a third Qualified Appraiser is
appointed, the fees and expenses charged by such Qualified Appraiser shall be
borne equally by Purchaser (or Purchaser's estate) and the Company. The Company
will provide such data as any Qualified Appraiser deems necessary or useful in
connection with such Appraiser's determination of the FMV per Share. A
"Qualified Appraiser" is a professional appraiser or independent certified
public accountant who is qualified by experience and ability to appraise the
Shares. Within 30 days after the determination of the FMV

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per Share in accordance with this Section 6.2(b), the Company or its assignee
may elect to purchase any or all Shares subject to the Company's right of first
refusal pursuant to this Section 6.2.

        6.3 TERMINATION OF LAPSING REPURCHASE RIGHT AND RIGHT OF FIRST REFUSAL.
Purchaser's obligations and the Company's rights under the Lapsing Repurchase
Right shall terminate with respect to any portion of the Shares when and to the
extent that such Shares are vested in accordance with Section 6.1(c).
Purchaser's obligations and the Company's rights under the right of first
refusal set forth in Section 6.2 hereof shall terminate upon the earlier of (i)
the first sale of Common Stock by the Company to the public which raises an
aggregate of not less than $5,000,000 and which is effected pursuant to a
registration statement filed with, and declared effective by, the Securities and
Exchange Commission (the "SEC") under the Securities Act or (ii) the merger or
consolidation of the Company into, or the sale of all or substantially all of
the Company's assets to, another corporation, if immediately after such merger,
consolidation or sale of assets, at least 50% of the capital stock of the
Company or such other corporation is owned by persons who are not holders of
capital stock of the Company immediately prior to such merger, consolidation or
sale.

        6.4 ASSIGNMENT. Notwithstanding anything to the contrary in this
Agreement, the Company may assign its rights under this Section 6 to one or more
persons or entities who shall have the right to exercise such rights in his, her
or its own name and for his, her or its own account. If the exercise of any such
right requires the consent of the California Securities Commissioner or the
consent of the Securities Commissioner, or the equivalent, of another state, the
parties agree to cooperate in requesting such consent.

        6.5 ADJUSTMENT. If, from time to time during the term of the Lapsing
Repurchase Right or the right of first refusal available pursuant to Section 6.2
hereof:

            (a) There is any stock dividend or liquidating dividend of cash
and/or property, stock split or other change in the character or amount of any
of the outstanding securities of the Company; or

            (b) There is any consolidation, merger or sale of all or
substantially all of the assets of the Company;

then, in such event, any and all new, substituted or additional securities or
other property to which Purchaser is entitled by reason of Purchaser's ownership
of Shares shall be immediately subject to such Lapsing Repurchase Right and
right of first refusal and be included in the word "Shares" for all purposes
with the same force and effect as the Shares presently subject to such Lapsing
Repurchase Right and right of first refusal (provided, however, if such
consolidation, merger or sale of all, or substantially all, of the assets of the
Company causes a termination of such Lapsing Repurchase Right and right of first
refusal, then such new, substituted or additional securities or other property
shall not be included in the word "Shares" for the purposes of this Section),
and the repurchase price per Share as set forth in Sections 6.1(a) and 6.2(a)
hereof shall

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be proportionately adjusted for any increase or decrease in the number of Shares
resulting from such event.

        6.6 ESCROW. As security for Purchaser's faithful performance of the
terms of this Agreement and to insure the availability for delivery of
Purchaser's Shares upon exercise of the Company's Lapsing Repurchase Right or
right of first refusal herein provided for, Purchaser agrees to deliver to and
deposit with the Secretary of the Company or the Secretary's nominee (in either
case, the "Escrow Agent"), as Escrow Agent in this transaction, three
Assignments Separate From Certificate duly endorsed (with date and number of
shares blank) in the form attached hereto as Exhibit A, together with the
certificate or certificates evidencing the Shares; said documents are to be held
by the Escrow Agent and delivered to said Escrow Agent pursuant to the Joint
Escrow Instructions of the Company and Purchaser set forth in Exhibit B attached
hereto and incorporated herein by this reference, which instructions shall also
be delivered to the Escrow Agent at the closing hereunder.

        6.7 RESTRICTION ON ALIENATION. Purchaser agrees that Purchaser will not
sell, transfer, gift, pledge, hypothecate, assign or otherwise dispose of any of
the Shares or any right or interest therein, whether voluntary, by operation of
law or otherwise, without the prior written consent of the Company, except a
transfer which meets the requirements of this Subscription Agreement and
complies with all applicable law. Any sale, transfer, gift, pledge,
hypothecation, assignment or purported sale, transfer or other disposition of
such Shares by Purchaser shall be null and void unless the terms, conditions and
provisions of this Agreement are strictly observed.

        6.8 LOCKUP AGREEMENT. Purchaser, if requested by the Company and an
underwriter of Common Stock or other securities of the Company, agrees not to
sell or otherwise transfer or dispose of any Common Stock (or other securities)
of the Company held by Purchaser during the period not to exceed 180 days as
requested by the managing underwriter following the effective date of a
registration statement of the Company filed under the Securities Act, provided
that all officers and directors of the Company are required or agree to enter
into similar agreements. Such agreement shall be in writing in a form
satisfactory to the Company and such underwriter. The Company may impose
stop-transfer instructions with respect to the shares or other securities
subject to the foregoing restriction until the end of such period.

                                    SECTION 7
                                     LEGENDS

        All certificates representing any Shares of the Company subject to the
provisions of this Subscription Agreement shall have endorsed thereon legends in
substantially the following form unless in the opinion of the Company's counsel
such legends are no longer necessary:

            (a) "THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY BE
TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF A SUBSCRIPTION AGREEMENT
BETWEEN THE COMPANY AND THE REGISTERED HOLDER, OR THE REGISTERED HOLDER'S
PREDECESSOR IN INTEREST, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE
COMPANY."

                                      -11-
<PAGE>   12

            (b) "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS
OF ANY STATE, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR
IN CONNECTION WITH, THE SALE, TRANSFER OR DISTRIBUTION THEREOF. NO SUCH SALE,
TRANSFER OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATING THERETO OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED."

                                    SECTION 8
                                  MISCELLANEOUS

        8.1 OBLIGATIONS OF TRANSFEREES. Each transferee of any Shares, or of any
interest in such Shares, shall hold the Shares or interest subject to all of the
provisions of this Subscription Agreement. Any such transferee shall make no
further transfers except as permitted by this Subscription Agreement.

        8.2 TRANSFERS IN VIOLATION OF SUBSCRIPTION AGREEMENT. The Company shall
not be required (i) to transfer on its books any Shares which shall have been
sold or transferred in violation of any of the provisions set forth in this
Agreement, or (ii) to treat as owner of such Shares or to accord the right to
vote as such owner or to pay dividends to any transferee to whom such Shares
shall have been so transferred.

        8.3 SHAREHOLDER RIGHTS. Subject to the provisions of this Subscription
Agreement, Purchaser shall, during the term of this Subscription Agreement,
exercise all rights and privileges of a shareholder of the Company with respect
to the purchased Shares.

        8.4 FURTHER ASSURANCES. The parties agree to execute such further
instruments and to take such further actions as may reasonably be necessary to
carry out the intent of this Subscription Agreement.

        8.5 NOTICE. Any notice required or permitted hereunder shall be given in
writing and shall be deemed effectively given upon personal delivery or upon
deposit in the United States Post Office, by registered or certified mail with
postage and fees prepaid, addressed to the other party hereto at such party's
address hereinafter shown below such party's signature or at such other address
as such party may designate by ten days advance written notice to the other
party hereto.

        8.6 SUCCESSORS AND ASSIGNS. This Subscription Agreement shall inure to
the benefit of the successors and assigns of the Company and, subject to all
compliance with the restrictions on transfer herein set forth, be binding upon
Purchaser and Purchaser's heirs, executors, administrators and permitted
successors and assigns.

        8.7 GOVERNING LAW; ENTIRE AGREEMENT; AMENDMENT. This Subscription
Agreement shall be construed under the laws of the State of California and
constitutes the entire

                                      -12-
<PAGE>   13

Subscription Agreement of the parties with respect to the subject matter hereof
superseding all prior written or oral agreements, and no amendment or addition
hereto shall be deemed effective unless agreed to in writing by the parties
hereto.

        8.8 SPECIFIC PERFORMANCE. Purchaser agrees that, until a public market
for the Shares exists, the Shares cannot be readily purchased, sold or evaluated
in the open market, that they have a unique and special value, and that the
Company and its shareholders would be irreparably damaged if the terms of this
Subscription Agreement were not capable of being specifically enforced and, for
this reason, among others, Purchaser agrees that the Company shall be entitled
to a decree of specific performance of the terms hereof or an injunction
restraining violation of this Subscription Agreement, said right to be in
addition to any other remedies available to the Company.

        8.9 SEVERABILITY. If any provision of this Subscription Agreement is
held by a court of competent jurisdiction to be invalid, void or unenforceable,
the remaining provisions shall nevertheless continue in full force and effect
without being impaired or invalidated in any way and shall be construed in
accordance with the purposes and tenor and effect of this Subscription
Agreement.

        8.10 NO EMPLOYMENT RELATIONSHIP. Nothing in this Subscription Agreement
shall be deemed to create any employment relationship between the Company and
Purchaser or to affect in any manner whatsoever the right or power of the
Company to terminate any employment of Purchaser by the Company, for any reason,
with or without cause.

        8.11 SURVIVAL. The representations, warranties, covenants and agreements
made herein shall survive any investigation and the Closing.

        8.12 CALIFORNIA CORPORATE SECURITIES LAW. THE SALE OF THE COMMON STOCK
WHICH IS THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH
COMMON STOCK OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO SUCH QUALIFICATION IS UNLAWFUL UNLESS THE SALE OF COMMON STOCK IS
EXEMPT FROM QUALIFICATION BY SECTIONS 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS SUBSCRIPTION AGREEMENT ARE
EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS
SO EXEMPT.

                                      -13-
<PAGE>   14

        8.13 COUNTERPARTS. This Subscription Agreement may be executed in
counterparts, each of which shall be enforceable against the party actually
executing such counterpart, and which together shall constitute one instrument.

Dated:  September 8, 1999
                                         /s/ Mark MacWhirter
                                         --------------------------------------
                                         Mark MacWhirter

                                         Address: 134 Dusty Rose Court
                                                  -----------------------------
                                                  Simi Valley, CA 93065
                                                  -----------------------------

                                      -14-
<PAGE>   15

        The foregoing Subscription Agreement is hereby confirmed and accepted as
of the date set forth below and the Company agrees to issue to Purchaser the
Common Stock listed above in accordance with the terms and conditions set forth
therein.

                                      IXIA COMMUNICATIONS

                                      By:  /s/ Errol Ginsberg
                                         --------------------------------------
                                         Errol Ginsberg, President

                                      Date: September 8, 1999

                                      -15-
<PAGE>   16

                                    EXHIBIT A

                      ASSIGNMENT SEPARATE FROM CERTIFICATE

        FOR VALUE RECEIVED _________________________________ hereby sells,
assigns and transfers unto
_______________________________________________________ (______) shares of the
Common Stock (the "Shares") of Ixia Communications, a California corporation
(the "Company"), standing in the undersigned's name on the books of the Company
represented by Certificate No. ________ herewith, and does hereby irrevocably
constitute and appoint __________________________________ attorney to transfer
the Shares on the books of the Company with full power of substitution in the
premises.

Dated:______________________________

Signature:__________________________

                                       A-1
<PAGE>   17

                                    EXHIBIT B

                            JOINT ESCROW INSTRUCTIONS

                                September 8, 1999

Ronald W. Buckly, Secretary
Ixia Communications
4505 Las Virgenes Road
Suite 209
Calabasas, CA  91302

Dear Mr. Buckly:

        As Escrow Agent for both Ixia Communications, a California corporation
(the "Company"), and the undersigned purchaser of Common Stock of the Company
("Purchaser"), you are hereby authorized and directed to hold the documents
delivered to you pursuant to the terms of that certain Subscription Agreement
(the "Agreement"), dated as of September 8, 1999, to which a copy of these Joint
Escrow Instructions is attached as Exhibit B, in accordance with the following
instructions:

        1. In the event the Company and/or any assignee of the Company (referred
to collectively for convenience herein as the "Company") shall elect to exercise
any repurchase right or right of first refusal (collectively, the "Repurchase
Rights") set forth in the Agreement, the Company shall give to Purchaser and you
a written notice specifying the number of shares of stock to be purchased, the
purchase price and the time for a closing hereunder at the principal office of
the Company. Purchaser and the Company hereby irrevocably authorize and direct
you to close the transaction contemplated by such notice in accordance with the
terms of said notice.

        2. At the closing, you are directed (a) to date the stock assignments
necessary for the transfer in question, (b) to fill in the number of shares
being transferred and (c) to deliver same, together with the certificate
evidencing the shares of stock to be transferred, to the Company against the
simultaneous delivery to you of the purchase price (by cash, check, evidence of
cancellation of indebtedness of Purchaser to the Company, or some combination
thereof) for the number of shares of stock being purchased pursuant to the
exercise of the Repurchase Rights.

        3. Purchaser irrevocably authorizes the Company to deposit with you any
certificates evidencing shares of stock to be held by you hereunder and any
additions and substitutions to said stock as provided in the Agreement.
Purchaser does hereby irrevocably constitute and appoint you as Purchaser's
attorney-in-fact and agent for the term of this escrow to execute with respect
to such securities all stock certificates, stock assignments or other documents
necessary

                                      B-1
<PAGE>   18

or appropriate to make such securities negotiable and to complete any
transaction herein contemplated.

        4. This escrow shall terminate at such time as there are no longer any
shares of stock subject to the Repurchase Rights under the Agreement.

        5. If at the time of termination of this escrow you should have in your
possession any documents, securities or other property belonging to Purchaser,
you shall deliver all of same to Purchaser and shall be discharged of all
further obligations hereunder.

        6. Your duties hereunder may be altered, amended, modified or revoked
only by a writing signed by all of the parties hereto.

        7. You shall be obligated only for the performance of such duties as are
specifically set forth herein and may rely and shall be protected in relying or
refraining from acting on any instrument reasonably believed by you to be
genuine and to have been signed or presented by the proper party or parties. You
shall not be personally liable for any act you may do or omit to do hereunder as
Escrow Agent or as attorney-in-fact for Purchaser while acting in good faith and
in the exercise of your own good judgment, and any act done or omitted by you
pursuant to the advice of your own attorneys shall be conclusive evidence of
such good faith.

        8. You are hereby expressly authorized to disregard any and all warnings
given by any of the parties hereto or by any other person or corporation,
excepting only orders or process of courts of law, and you are hereby expressly
authorized to comply with and obey orders, judgments or decrees of any court. In
case you obey or comply with any such order, judgment or decree of any court,
you shall not be liable to either of the other parties hereto or to any other
person, firm or corporation by reason of such compliance, notwithstanding any
such order, judgment or decree being subsequently reversed, modified, annulled,
set aside, vacated or found to have been entered without jurisdiction.

        9. You shall not be liable in any respect on account of the identity,
authorities or rights of the parties executing or delivering or purporting to
execute or deliver the Agreement or any documents or papers deposited or called
for hereunder.

        10. You shall not be liable for the outlawing of any rights under any
statute of limitations with respect to these Joint Escrow Instructions or any
documents deposited with you.

        11. You shall be entitled to employ such legal counsel and other experts
as you may deem necessary or proper to advise you in connection with your
obligations hereunder, you may rely upon the advice of such counsel, and you may
pay such counsel reasonable compensation therefor.

        12. Your responsibilities as Escrow Agent hereunder shall terminate if
you shall cease to be Secretary of the Company or if you shall resign by written
notice to each of the other

                                       B-2
<PAGE>   19

parties hereto. In the event of any such termination, the Company shall appoint
any officer of the Company as successor Escrow Agent.

        13. If you reasonably require other or further instruments in connection
with these Joint Escrow Instructions or obligations in respect hereto, the
necessary parties hereto shall join in furnishing such instruments.

        14. It is understood and agreed that should any dispute arise with
respect to the delivery and/or ownership or right of possession of the
securities held by you hereunder, you are authorized and directed to retain in
your possession without liability to anyone all or any part of said securities
until such dispute shall have been settled either by mutual written agreement of
the parties concerned or by a final order, decree or judgment of a court of
competent jurisdiction after the time for appeal has expired and no appeal has
been perfected, but you shall be under no duty whatsoever to institute or defend
any such proceedings.

        15. Any notice required or permitted hereunder shall be given in writing
and shall be deemed effectively given upon personal delivery or upon deposit in
the United States Post Office, by registered or certified mail with postage and
fees prepaid, addressed to each of the other parties thereunto entitled at the
following addresses, or at such other address as a party may designate by ten
days advance written notice to each of the other parties hereto.

COMPANY:       Ixia Communications
               4505 Las Virgenes Road
               Suite 209
               Calabasas, CA  91302
               Attention: Secretary

PURCHASER:     Mark MacWhirter
               134 Dusty Rose Court
               Simi Valley, CA 93065

ESCROW AGENT:  Ixia Communications
               4505 Las Virgenes Road
               Suite 209
               Calabasas, CA  91302
               Attention: Secretary

        16. By signing these Joint Escrow Instructions, you become a party
hereto only for the purpose of said Joint Escrow Instructions; you do not become
a party to the Agreement.

                                      B-3
<PAGE>   20

        17. This instrument shall be binding upon and inure to the benefit of
the parties hereto and their respective successors and permitted assigns.

                                        Very truly yours,

                                        Ixia Communications,
                                        a California corporation

                                        By: /s/ Errol Ginsberg
                                            -----------------------------------
                                                Errol Ginsberg
                                        Title:  President

                                        PURCHASER

                                        /s/ Mark MacWhirter
                                        ---------------------------------------
                                        Signature

                                        Print Name:  Mark MacWhirter
                                                     --------------------------

                                        Agreed to and accepted as of the
                                        date set forth above.

                                        ESCROW AGENT

                                        /s/ Ronald W. Buckly
                                        ---------------------------------------
                                        Secretary

                                      B-4<PAGE>   1
                                                                  EXHIBIT 10.14

                                  OFFICE LEASE
                             BASIC LEASE INFORMATION

Date: November 5, 1999

Landlord: Malibu Canyon Office Partners, LLC, a California limited liability
        company.

Tenant: Ixia Communications, Inc., a California corporation.

Section l(a) - Building: Two, commonly known as 26601 W. Agoura Road, Calabasas,
        CA 91302.

        Section l(b) - Premises: Suite 200, containing twenty-four thousand nine
        hundred ninety-one (24,991) square feet of Rentable Area, located on the
        second (2nd) floor of the Building (which is the first floor of office
        space), plus the "Must Take Space" described in Section 40 below.

Section l(c) - Intentionally Omitted.

        Section l(j) - Tenant's Percentage Share: Fifty and four tenths percent
        (50.40%)(which includes the "Must Take Space").

Section 2 - Term: Five (5) years.

Section 2 - Estimated Commencement Date: January 15, 1999.

Section 3 - Base Rent: One and 45/100 dollars ($1.45) per month per square foot
        of Rentable Area contained in the premises (triple net).

Section 3(g) - Escalations to Base Rent: Three percent (3%) increase on each
        twelve (12) month anniversary of the Commencement Date during the Term
        and any extension and/or renewal thereof.

Section 29 - Security Deposit: An amount equal to one (1) month's Rent.

Section 31 - Landlord's and Tenant's Address for Notices:

Landlord:                             Tenant:

c/o The Johnston Group                Ixia Communications, Inc.
26635 W. Agoura Road, Suite 105       26635 W. Agoura Road, Ste 100
Calabasas, CA 91302                   Calabasas, CA 91302
Attn: Mr. Jeff Johnston, President    Attn: Mr. Errol Ginsberg, President

With a copy to:

Kenneth S. Fields, Esq.
Fields & Pearl
1875 Century Park East, 14th Floor
Los Angeles, CA 90067

Section 34 - Brokers: Richard Abbitt of Lee & Associates, for Tenant, and The
        Johnston Group, for Landlord.

Section 35 - Parking: Three point eight (3.8) non-exclusive surface parking
        spaces per each one thousand square feet of Usable Area contained in the
        Premises (prorated and rounded to the nearest whole number to the extent
        Usable Area is not evenly divisible by 1,000), plus two (2) additional
        Visitor parking spaces.

Section 38 - Guarantor: None.

Exhibit(s) and Addendum:

Exhibit "A" - Site Plan of Project
Exhibit "B" - Floor Plan of Premises
Exhibit "C" - Improvement of the Premises
Exhibit "D" - Rules and Regulations
Exhibit "E" - Intentionally Omitted

                                       i
<PAGE>   2

This Basic Lease Information shall be a part of this Lease, provided that in the
event of any conflict between any Basic Lease Information and the provisions
contained in the body of this Lease, the latter shall control.

                                       ii
<PAGE>   3

                                        TABLE OF CONTENTS

<TABLE>
<S>                                                             <C>
1.      Definitions.........................................      1
2.      Term; Condition of Premises.........................      4
3.      Base Rent...........................................      5
4.      Escalation Rent.....................................      6
5.      Use.................................................      7
6.      Services............................................      8
7.      Impositions Payable by Tenant.......................      9
8.      Alterations.........................................     10
9.      Liens...............................................     11
10.     Repairs.............................................     11
11.     Destruction or Damage...............................     11
12.     Insurance...........................................     12
13.     Indemnification.....................................     13
14.     Compliance with Legal Requirements..................     13
15.     Assignment and Subletting...........................     13
16.     Rules...............................................     16
17.     Entry by Landlord...................................     16
18.     Tenant's Default....................................     16
19.     Landlord's Remedies.................................     17
20.     Landlord's Default and Tenant's Remedies............     18
21.     Attorneys' Fees.....................................     18
22.     Eminent Domain......................................     18
23.     Subordination.......................................     19
24.     Sale................................................     19
25.     Estoppel Certificate................................     19
26.     Project Planning....................................     20
27.     No Light, Air, or View Easement.....................     20
28.     Holding Over........................................     20
29.     Security Deposit....................................     20
30.     Waiver..............................................     21
31.     Notices and Consents; Confidentiality...............     21
32.     Complete Agreement..................................     21
33.     Authority...........................................     21
34.     Brokers.............................................     21
35.     Parking.............................................     22
36.     Force Majeure.......................................     22
37.     Waiver of Trial by Jury.............................     22
38.     Intentionally Omitted...............................     22
39.     Recapture...........................................     22
40.     Signage.............................................     22
41.     Must Take Space.....................................     23
42.     Expansion Space.....................................     23
43.     Miscellaneous.......................................     23
</TABLE>

                                      iii
<PAGE>   4

                                  OFFICE LEASE

        THIS OFFICE LEASE (this "Lease"), dated November 5, 1999 for purposes of
reference only, is made and entered into by and between Malibu Canyon Office
Partners, LLC, a California limited liability company ("Landlord") and Ixia
Communications, Inc., a California corporation ("Tenant").

                                   WITNESSETH:

        Landlord hereby leases to Tenant, and Tenant hereby leases from Landlord
the "Premises" described in Section l(b) below for the "Term" and subject to the
terms, covenants, agreements and conditions hereinafter set forth, to each and
all of which Landlord and Tenant hereby mutually agree.

        1. Definitions. Unless the context otherwise specifies or requires.
The following terms shall have the meanings herein specified:

             (a) The term "Building" shall mean the building specified in the
Basic Lease Information located in an unincorporated area within the County of
Los Angeles, and having a postal address within Calabasas, California.
References in this Lease to the Building shall be deemed to mean the Building or
any portion thereof, if the context so requires. The term "Project" shall mean
that certain commercial project generally depicted on Exhibit "A" attached
hereto, including, without limitation, the Building and other buildings, "Common
Areas" (as hereinafter defined), the land upon which the Building, such other
buildings and the Common Areas are located, and, at Landlord's discretion, such
additional real property, areas, land, buildings or other improvements as may
from time to time be hereafter added to the Project. References in this Lease to
the Project shall be deemed to mean the Project or any portion thereof, as the
same exists from time to time, if the context so requires. The depiction of the
Project on Exhibit "A" does not constitute a representation, covenant or
warranty of any kind by Landlord, and Landlord and/or any owner of all or any
part of the Project reserve the right from time to time to change the size,
layout and dimensions of the Project or any of the buildings therein, the
parking areas, and/or identity and type of use of other tenants; provided,
however, that (i) no such change(s) shall substantially reduce Tenant's ability
to use the Premises on a permanent basis, (ii) Landlord shall use commercially
reasonable efforts to ensure that the number of parking stalls in Corporate
Center (as depicted on Exhibit "A") is not substantially reduced on a permanent
basis, and provided further that if any such change(s) to the size, layout and
dimensions of the Project substantially reduces Tenant's use of the Premises for
more than five (5) consecutive business days, Tenant shall be entitled to an
abatement of Base Rent and Escalation Rent to the extent the Premises is
actually not used by Tenant. Tenant hereby waives any claim for damages for any
inconvenience to or interference with Tenant's business or any loss of occupancy
or quiet enjoyment of the Premises by reason of the foregoing. Landlord and/or
any owner of all or any portion of the Project shall have the right to convey
its ownership of all or any part of the Project to one or more third parties,
and thereafter the third party shall have the right to remove such conveyed
portion from the definition of "Project" set forth in this Lease.

             Landlord hereby grants Tenant, its employees, invitees and
licensees the right to use the Common Areas of the Building and the Project
(including, without limitation, parking areas, sidewalks, lobby and corridors),
subject to the terms and conditions of this Lease and any rules and regulations
promulgated by Landlord from time to time in accordance with this Lease.

             (b) The term "Premises" shall mean the suite(s) within the
Building, containing the square footage, and located on the floor(s), specified
in the Basic Lease Information, which is shown as cross-hatched on the floor
plan(s) attached hereto as Exhibit "B". References in this Lease to the Premises
shall be deemed to mean the Premises or any portion thereof, if the context so
requires. Notwithstanding the foregoing, if the Basic Lease Information
references that the Premises will be comprised of more than one (1) suite number
and such suites will be combined pursuant to Exhibit "C" hereof, then Landlord
shall have the right to include the entire Premises under one (1) suite number,
which number shall be determined by Landlord upon consultation with Tenant.

                                       1
<PAGE>   5

             (c) Intentionally Omitted.

             (d) The term "Operating Expenses" shall mean all costs of
ownership, management, operation, maintenance, repair and replacement of the
Project, including, without limitation: wages, salaries and other compensation
and benefits of all persons engaged in the operation, maintenance and security
of the Project; property management, legal, accounting and consulting fees in
the maintenance, management, operation and/or repair of the Project; janitorial,
alarm, security and other services; roof repair and re-roofing; Project
management office rent or rental value; rent or rental value for Project space
occupied by Common Area facilities, such as cafeterias, fitness centers and
other amenities; cost of power, water, waste disposal, telephone, elevator,
sprinkler and other utilities usage and facilities maintenance and service;
materials and supplies; costs of maintenance and repairs including with respect
to systems and equipment; costs of permits, licenses, certificates and
inspections; insurance premiums for all insurance carried by Landlord in
connection with the Project as reasonably determined by Landlord and the
deductible portion of any insured loss thereunder; depreciation on personal
property; the cost of landscaping, relamping and all supplies, tools, equipment
and materials used in the operation, repair, restoration and maintenance of the
Project; and the cost of capital repairs, replacements or other improvements or
other costs incurred in connection with the Project, including, without
limitation, those (i) which are intended to effect economies in the operation or
maintenance of the Project, (ii) that are required to comply with present or
anticipated conservation programs, (iii) which are replacements or modifications
of nonstructural items located in the Common Areas required to keep the Common
Areas in good order and condition, (iii) that are required under any applicable
"Laws" (as hereinafter defined) enacted following the construction of the
applicable portion of the Project; provided, however, that any capital
expenditure shall be amortized over its useful life as Landlord shall reasonably
determine, and the unamortized cost thereof shall bear interest at the rate of
ten percent (10%) per annum or such higher rate as was paid by Landlord on funds
borrowed for the purposes of purchasing, installing and/or constructing such
capital improvements. Operating Expenses shall not include: (i) Tax Expenses;
(ii) depreciation (except as provided above); (iii) cost of tenants'
improvements; (iv) real estate brokers' commissions; (v) legal fees in
connection with the leasing of the Project; (vi) costs reimbursed by policies of
insurance, the premiums of which are included in Operating Expenses (vii)
interest on or amortization of any Mortgage, as defined in Section 23 below;
(viii) financing costs (except for interest or amortization of any items
included within Operating Expenses on an amortized basis); (ix) franchise taxes
and net income taxes of Landlord; (x) the cost of any item or items for which
Landlord is reimbursed by other tenants of the Project (other than by payment of
such tenant's share of Operating Expenses or Tax Expenses); (xi) rent under any
ground lease and/or underlying leases; (xii) direct compensation of any kind
paid to officers and executives of Landlord above the level of project manager;
(xiii) any costs stated in Operating Expenses representing an amount paid to a
corporation or entity which is controlled by or under common control with
Landlord to the extent in excess of the amount which would be paid in the
absence of such relationship (provided that the parties hereby acknowledge that
a construction supervision and management fee of ten percent (10%) and five
percent (5%), respectively, do not constitute such an excess amount); (xiv)
advertising and promotional expenses incurred in the leasing of the Building or
any portion of the Project; (xv) any bad debt loss, rent loss or reserves for
bad debts or rent loss; (xvi) any and all costs associated with the operation of
the business of Landlord, including operation of Landlord as a limited liability
company or other legal entity, as the same are distinguished from costs of
operation, maintenance, repair, restoration and/or management of the Building
and/or Project; (xvii) all charges for complying with laws, codes, regulations
or ordinances relating to Hazardous Materials caused to be located upon the
Project by Lessor and/or its employees; (xviii) costs of special services (which
shall not cover normal variations in repairs or the need for repairs) for
tenants who, in the aggregate, do not occupy at least fifty percent (50%) of the
Project, but only to the extent that such services are not offered to Tenant;
(xix) tenant concessions and any other costs associated with the leasing or sale
of the Project or any portion thereof; (xx) costs incurred in removing and
storing the property of former tenants or occupants of the Project; (xxi) legal
or accounting fees, costs and disbursements for negotiating leases or enforcing
the lease obligations of other tenants in the

                                       2
<PAGE>   6

Building; (xxii) Landlord's expenses relating to any parking facilities on or
about the Project, except to and only to the extent that such expenses exceed
the revenues generated by such facilities; (xxiii) costs incurred after the
Commencement date for architectural additions to the Building that result in a
larger building; (xxiv) capital expenditures for initial building construction;
and (xxv) salaries of officers, executives or other employees of Landlord, any
affiliate of Landlord, or partners or affiliates of such partners or affiliates,
other than any personnel engaged in the management, operation, maintenance, and
repair of the Project (but not leasing or marketing)(and then only to the extent
of such engagement). Actual Operating Expenses for each calendar year shall be
adjusted to equal Landlord's reasonable estimate of Operating Expenses had the
total Rentable Area of the Project been occupied. If Landlord is not furnishing
any particular work or service (the cost of which, if performed by Landlord,
would be included in Operating Expenses) to a tenant who has undertaken to
perform such work or service in lieu of the performance thereof by Landlord,
Operating Expenses shall be deemed to be increased by an amount equal to the
additional Operating Expenses which would reasonably have been incurred during
such period by Landlord if Landlord had at its own expense furnished such work
or service.

             (e) The term "Tax Expenses" shall mean all federal, state, county,
municipal or local governmental taxes, fees, charges or other impositions of
every kind and nature, whether general, special, ordinary or extraordinary,
including, without limitation, real estate taxes, general and special taxes
and/or assessments (including, without limitation, any assessment, tax, fee,
levy or charge by any school, agricultural, lighting, drainage, transportation,
community facilities, improvement or other district), transit taxes, personal
property taxes imposed upon the fixtures, machinery, equipment, apparatus,
systems and equipment, appurtenances, furniture and other personal property used
in connection with the Project, which shall be paid during any calendar year
(without regard to any different fiscal year used by such governmental
authority) because of or in connection with the ownership, leasing and/or
operation of the Project. Tax Expenses shall include any assessment, tax, fee,
levy or charge in addition to, or in substitution, partially or totally, of any
assessment, tax, fee, levy or charge previously included within the definition
of Tax Expenses, and all consultants' and attorneys' fees and expenses incurred
for the purpose of maintaining an equitable assessed valuation of the Building
and/or attempting to protest, reduce or minimize Tax Expenses.

             (f) The term "Building Operating Expenses" shall mean the portion
of Operating Expenses allocated to the Building pursuant hereto. The term
"Building Tax Expenses" shall mean the portion of Tax Expenses allocated to the
Building pursuant hereto. The parties acknowledge that the Building is a part of
a multi-building project and that the costs and expenses incurred in connection
with the Project should be shared between the tenants of the Building and the
tenants of the other buildings of the Project. Accordingly, Operating Expenses
and Tax Expenses are determined annually for the Project as a whole, and a
portion of the Operating Expenses and Tax Expenses, respectively, which portion
shall be determined by Landlord on an equitable basis, shall be allocated to the
tenants of the Building (as opposed to the tenants of any other buildings of the
Project) and such portion shall be the Building Operating Expenses and Building
Tax Expenses, respectively, for purposes of this Lease. Such portion of
Operating Expenses and Tax Expenses allocated to the tenants of the Building
shall include all Operating Expenses and Tax Expenses, respectively,
attributable solely to the Building, and an equitable portion of the Operating
Expenses and Tax Expenses, respectively, attributable to the Project as a whole.
In addition, Landlord shall have the right, from time to time, to equitably
allocate some or all of the Operating Expenses and/or Tax Expenses for the
Project among different portions or occupants of the Project, in Landlord's
discretion.

             (g) The term "Rentable Area" shall mean the area or areas of space
within any building in the Project determined as follows: (i) the amount of
Rentable Area on a single tenancy floor is determined by measuring from the
inside surface of the outer glass and extensions of the plane thereof in
nonglass areas and shall include all areas within the outside walls, excluding
vertical penetrations such as building stairs, elevators shafts, flues, vents,
stacks, pipe shafts and vertical ducts, provided, however, that vertical
penetrations which are for the specific use of the tenant, such as special
stairs or elevators, shall be included within Rentable Area; (ii) the amount

                                       3
<PAGE>   7

of Rentable Area for a partial floor shall include all space within the demising
walls (measured from the mid-point of demising walls, and in the case of
exterior walls, measured as defined in clause (i) above), plus the tenant's
share of any Common Areas on such floor (such share being equal to the
percentage which the amount of Rentable Area within the Premises bears to the
total amount of Rentable Area on the floor); and (iii) the amount of Rentable
Area for either a single tenancy floor or a partial floor shall include Tenant's
Percentage of Common Areas devoted to or serving more than one floor of the
applicable building or such building as a whole. No deductions shall be made in
calculating the amount of Rentable Area for columns or projections necessary to
the Building. Notwithstanding the foregoing or anything elsewhere contained in
this Lease, the parties hereby agree that for all purposes of this Lease, the
Premises shall be deemed to contain the amount of Rentable Area, and that
Tenant's Base Rent, Percentage Share, Security Deposit, and all other matters
determined by the amount of Rentable Area contained in the Premises shall be the
amount set forth in the Basic Lease Information, notwithstanding any deviation
therefrom. Landlord shall have the right at any time and from time to time to
have its architect or space planner remeasure and certify in writing the
Rentable Area of the Premises, which determination and certification shall be
conclusive, and thereupon Tenant's Percentage Share, Base Rent, Security
Deposit, and any other matters in this Lease which are determined based upon the
Rentable Area contained in the Premises shall be adjusted accordingly, if
required.

             (h) The term "Usable Area" shall mean all floor area in a tenant
space, measured from the inside surface of the outer glass and extensions of the
plane thereof in non-glass areas and shall include all areas within the outside
walls, excluding vertical penetrations such as building stairs, elevators
shafts, flues, vents stacks, pipe shafts and vertical ducts, provided, however,
that vertical penetrations which are for the specific use of the tenant, such as
special stairs or elevators, shall be included within Usable Area. In
calculating Usable Area, deductions shall not be made for columns or projections
necessary to the Building.

             (i) The term "Common Areas" shall mean those portions of the
Project which are provided, from time to time, for use in common by Landlord,
Tenant and any other tenants of the Project, which may include, without
limitation, public entrances, lobbies and rest rooms, fitness centers,
restaurants or cafeterias, elevators, stairways and access ways, loading docks,
ramps, drives and platforms and any passageways and service ways thereto, common
pipes, conduits, wires and appurtenant equipment serving the Project or any
portion thereof, loading and unloading areas, trash areas, parking areas,
roadways, sidewalks, walkways, parkways, driveways and landscaped areas.

             (j) "The term "Tenant's Percentage Share" shall mean the product
obtained by multiplying (i) 100 by (ii) the quotient obtained by dividing the
Rentable Area of the Premises by the total Rentable Area of the Building.
Tenant's Percentage Share shall initially be as specified in the Basic Lease
Information and shall be subject to adjustment in the event of a change in the
Rentable Area of the Premises and/or the Building (with Tenant's Percentage
Share as to the calendar year in which any such change occurs being determined
on a pro rata basis based on the number of days during such calendar year at
each such percentage share). Notwithstanding the foregoing or anything contained
in this Lease to the contrary, Tenant's Percentage Share of Operating Expenses
attributable to a restaurant, fitness center and/or similar facility(ies)
located at the Project shall be (i) separately determined with respect to each
such facility and (ii) obtained by multiplying (i) 100 by (ii) the quotient
obtained by dividing the Rentable Area of the Premises by the total Rentable
Area occupied by tenants of the Project who also pay their respective share of
such Operating Expenses (ie space occupied by tenants who do not participate in
such costs shall be excluded). Landlord shall use reasonable efforts to
negotiate all future leases (as opposed to expansions, renewals, or leases
entered into with existing tenants (or their affiliates)) for space at the
Project, as the same exists as of the Commencement Date, such that the tenants
thereunder will be obligated to pay their respective share of such Operating
Expenses.

             (k) The term "Laws" shall mean, collectively, any applicable
federal, state, local and/or municipal laws, statutes, ordinances, codes, rules,
regulations and/or other governmental requirements.

                                       4
<PAGE>   8

        2. Term; Condition of Premises. (a) The "Term" of this Lease shall
commence on the "Commencement Date" (as defined in Exhibit "C" attached hereto)
and, unless sooner terminated as hereinafter provided, shall be for the period
specified in the Basic Lease Information. If without fault of Tenant the
Commencement Date of this Lease has not occurred by the date which is ninety
(90) days following the Estimated Commencement Date set forth above (subject to
Force Majeure), this Lease shall terminate without further action by the
parties, and neither party shall have any further liability or obligation
hereunder. Except to the extent specifically otherwise provided in this Lease,
Landlord shall deliver the Premises to Tenant on the Commencement Date in an "as
is" condition with no alterations or improvements being made by Landlord.
Following the Commencement Date, Landlord may deliver to Tenant a notice
confirming the actual Commencement Date and the date of the expiration of the
Term specified in the Basic Lease Information, which notice shall be executed by
Tenant and returned to Landlord within five (5) days following Tenant's receipt
thereof.

        Tenant is aware that a portion of the Premises located on the second
(2nd) floor of the Building is currently leased to another tenant of Landlord
(the "Existing Tenant"). Tenant acknowledges and agrees that Landlord's
obligation to deliver possession of the Premises to Tenant, and to otherwise
complete the transaction contemplated under this Lease, shall be subject to
Landlord's ability to cause the Existing Tenant of the Premises to surrender the
same to Landlord, on such terms and conditions as are acceptable to Landlord in
its sole and absolute discretion. Landlord shall have no liability to Tenant if
Landlord is not able to effectuate the Existing Tenant's surrender of such space
on terms acceptable to it. However, notwithstanding the ninety (90) day period
referenced in the preceding paragraph, if the Existing Tenant does not surrender
such space to Landlord on or before December 7, 1999, then Tenant may cancel
this Lease by delivering written of cancellation to Landlord by 5:00 p.m. on
December 10, 1999, in which case neither party shall have any obligation to the
other under this Lease. Tenant's failure to deliver written notice of
cancellation notice by such time shall be deemed an election not to cancel this
Lease.

        (b) Provided Tenant is not in default under this Lease (which shall
include any matter which would constitute a default either with the passage of
time or the giving of notice) at any time prior to the time the "Extension
Notice" (as hereinafter defined) is received by Landlord or thereafter until the
commencement of the "Option Term" (as hereinafter defined) (subject to
applicable cure periods, if any), Tenant shall have the option to extend the
Term of this Lease for one (1) additional term (an "Option Term") of five (5)
years following the expiration of the initial Term, exercisable by delivering
written notice (the "Extension Notice") to Landlord of Tenant's desire to so
extend the Term by the Option Term, no later than nine (9) months, and no
earlier than twelve (12) months (except as permitted under Section 40 below),
prior to the expiration of the initial Term. Tenant's occupancy of the Premises
during the Option Term shall be subject to all of the terms and conditions of
this Lease, except that (i) the Base Rent payable by Tenant as of the
commencement of the Option Term shall be ninety-five percent (95%) of Landlord's
then current published rental rate for similar space in the Project, as
determined by Landlord, but in no event shall such Base Rent be less than the
amount payable by Tenant on the last day of the initial Term and (ii) Landlord
shall have no obligation to improve the Premises for the benefit of Tenant.
Wherever in this Lease the phrase the "initial Term" appears, the provision to
which such phrase pertains shall apply only to the initial Term and not to the
Option Term. The Base Rent payable by Tenant during the Option Term shall be
subject to increase at the times and in the manner described in Section 3(g)
below.

        3. Base Rent.

             (a) Tenant shall pay to Landlord from and after the Commencement
Date (other than with respect to the Must Take Space as provided in Section 41
below) during the Term of this Lease as "Base Rent" for the Premises, the
monthly amount specified in the Basic Lease Information.

             (b) Base Rent shall be paid to Landlord, in advance, on or before
the first day of each calendar month during the Term, except that Base Rent for
the initial full month during the Term for which Base Rent is due shall be

                                       5
<PAGE>   9

paid upon the execution of this Lease (provided that such payment shall be
subject to adjustment payment or reimbursement, as applicable, in the event the
actual Rentable Area of the Premises is determined to be other than as set forth
in the Basic Lease Information). In the event the Term commences on a day other
than the first day of a calendar month or ends on a day other than the last day
of a calendar month, the monthly Base Rent for the first and last fractional
months of the Term shall be appropriately prorated.

             (c) All sums of money due to Landlord under this Lease not
specifically characterized as rental shall constitute additional rent, and if
any such sum is not paid when due it shall nonetheless be collectible as
additional rent with the next installment of Base Rent thereafter falling due,
but nothing contained herein shall be deemed to suspend or delay the payment of
any sum of money at the time it becomes due and payable hereunder, or to limit
any other remedy of Landlord

             (d) Tenant hereby acknowledges that late payment by Tenant to
Landlord of rent and other sums due hereunder will cause Landlord to incur costs
not contemplated by this Lease, the exact amount of which will be difficult to
ascertain. Such costs include, but are not limited to, processing and accounting
charges, and late charges which may be imposed on Landlord by the terms of any
trust deed covering the Premises. Accordingly, if any installment of rent or any
other sums due from Tenant shall not be received by Landlord within five (5)
days of the date due, Tenant shall pay to Landlord a late charge equal to the
greater of (i) 6% of such overdue amount or (ii) $100.00. The parties hereby
agree that such late charge represents a fair and reasonable estimate of the
costs Landlord will incur by reason of late payment by Tenant. Acceptance of
such late charge by Landlord shall in no event constitute a waiver of Tenant's
default with respect to such overdue amount, nor prevent Landlord from
exercising any of the other rights and remedies granted hereunder. If a late
charge becomes payable for three (3) payments of any element of rent within any
twelve (12) month period, all subsequent payments of rent shall immediately and
automatically become payable by Tenant quarterly, in advance, instead of
monthly. Tenant acknowledges that its payment of Base Rent and additional rent
is a condition to Landlord's obligation to perform any of its covenants under
this Lease.

             (e) Any amount due to Landlord pursuant to this Lease, if not paid
when due, shall bear interest from the date due until paid at a rate (the
"Interest Rate") equal to the lesser of (i) 2% over the "prime" or "reference"
rate then most recently published by Bank of America N.T. & S.A. (or a
substitute prime rate of a comparable lending institution reasonably selected by
Landlord if Bank of America N.T. & S.A. no longer publishes a "prime" or
"reference" rate), or (ii) the maximum rate permitted by applicable Laws.
Payment of interest shall not excuse or cure any default hereunder by Tenant.

             (f) All payments of Base Rent, Escalation Rent and other monetary
obligations due from Tenant to Landlord pursuant to this Lease shall be paid to
Landlord, without deduction, abatement, counterclaim or offset, in lawful money
of the United States of America at Landlord's address for notices hereunder, or
to such other person or at such other place as Landlord may from time to time
designate by notice to Tenant.

             (g) On each twelve (12) month anniversary of the Commencement Date
during the Term, including, without limitation, any extension(s) and/or
renewal(s) thereof (each such day hereinafter referred to as an "Adjustment
Date"), the Base Rent payable by Tenant on the date immediately preceding the
applicable Adjustment Date shall be increased by three percent (3%) and such
increased amount shall constitute the Base Rent until the next Adjustment Date.
Landlord's failure to request payment of an estimated or actual rent adjustment
shall not constitute a waiver of the right to any adjustment provided for in
this Lease.

        4. Escalation Rent.

             (a) Tenant shall pay to Landlord as "Escalation Rent" for the
Premises, during each full or partial calendar year during the Term, (i)
Tenant's Percentage Share of all Building Operating Expenses for such year, plus
(ii) Tenant's Percentage Share of all Building Tax Expenses for such year.
Escalation Rent shall be paid monthly on an estimated basis, with subsequent
annual reconciliation, in accordance with the procedures set forth

                                       6
<PAGE>   10

in this Section 4. Tenant acknowledges that this Lease is what is commonly
referred to as a "triple net" lease, and that Tenant will be responsible for its
Percentage Share of all Building Operating Expenses and Building Tax Expenses,
without reference to any Base Year concept.

             (b) During December each calendar year, or as soon thereafter as
practicable, Landlord shall give Tenant notice of its estimate of any Escalation
Rent due for the ensuing calendar year. On or before the first day of each month
during the ensuing calendar year, Tenant shall pay to Landlord 1/12th of such
estimated Escalation Rent, provided that if such notice is not given in
December, Tenant shall continue to pay on the basis of the prior year's estimate
until such revised estimate is delivered, from and after which time (commencing
with the first day of the next calendar month after such notice is given; or if
such first day is less than fifteen (15) days after the date of Landlord's
notice, then on the first day of the second calendar month after such notice is
given) Tenant shall pay such amount as is necessary to bring Tenant current with
respect to such revised estimate for such calendar year, as if such revised
estimate had been delivered in December, and thereafter monthly payments shall
be based on such revised estimate, unless and until further revised in
accordance herewith. If at any time or times it appears to Landlord that the
Escalation Rent for the current calendar year will vary from its estimate,
Landlord may, by notice to Tenant, revise its estimate for such year, and
subsequent payments by Tenant for such year shall be based upon such revised
estimate.

             (c) Within 90 days after the close of each calendar year or as soon
after such 90-day period as practicable, Landlord shall deliver to Tenant a
statement of the actual Escalation Rent for such calendar year, accompanied by a
statement showing the Building Operating Expenses and Building Tax Expenses on
the basis of which the actual Escalation Rent was determined. Except as
expressly provided to the contrary in Section 4(c)(i) below, such statement
shall be final and binding upon Landlord and Tenant as to the amount of the
Building Operating Expenses and Building Tax Expenses. If Landlord's statement
discloses that Tenant owes an amount that is less than the estimated payments
for such calendar year previously made by Tenant, Landlord shall credit such
excess first against any sums then owed by Tenant to Landlord and then against
the next payments of rental due hereunder. If Landlord's statement discloses
that Tenant owes an amount that is more than the estimated payments for such
calendar year previously made by Tenant, Tenant shall pay the deficiency to
Landlord within thirty (30) days after delivery of the statement. The failure of
Landlord to timely furnish the statement for any calendar year shall not
prejudice Landlord from enforcing its rights hereunder.

             (i) Provided that Tenant is not in default in its obligations under
this Lease (including any matter which would constitute a default with either
the passage of time or the giving of notice)(subject to applicable cure periods,
if any), Tenant may, within sixty (60) days following the delivery by Landlord
to Tenant of the statement of Escalation Rent described above, request in
writing an audit of the Building Operating Expenses and Building Tax Expenses
which form the basis upon which Landlord determines the actual Escalation Rent.
Tenant shall specify in such written notice the portions of the Landlord's
statement disputed by Tenant, and, as a condition to Tenant's audit rights
hereunder, such notice must be accompanied by Tenant's payment in full to
Landlord of all amounts due from Tenant to Landlord as specified in the
Landlord's statement. Tenant shall have no right to withhold, deduct, or offset
any monetary obligation of Tenant to Landlord under the Lease (including,
without limitation, Tenant's obligation to make all rental payments owing under
this Lease, including, without limitation, all Escalation Rent) pending the
completion of and regardless of the results of any audit of records under this
Section. The right of Tenant under this Section 4(c)(i) may only be exercised
once for each Landlord's statement of Escalation Rent, and if Tenant fails to
meet any of the above conditions as a prerequisite to the exercise of such
right, the right of Tenant under this Section as to a particular Landlord's
statement of Escalation Rent shall be deemed waived. Tenant shall cause any
audit requested by it under this Section 4(c)(i) to be performed by an
independent firm of certified public accountants. Tenant must complete its audit
within ninety (90) days of the date of Tenant's audit request.

                                       7
<PAGE>   11

                    (ii) Tenant acknowledges that Landlord maintains its records
for Building Operating Expenses and Building Tax Expenses at its offices (as the
same may be located from time to time) and Tenant therefore agrees that any
review of records under Section 4(c)(i) above shall occur at such location and,
except as provided in Section 4(c)(vii) below, be at the sole expense of Tenant.
If Tenant discovers a discrepancy, then, at Landlord's option, a further review
shall be conducted in accordance with the provisions of Section 4(c)(iv) below.

                    (iii) Tenant acknowledges and agrees that any records
reviewed under Section 4(c)(i) constitute confidential information of Landlord,
which shall not be disclosed to anyone other than the accountants performing the
review and the principals of Tenant who receive the results of the review;
except in the event of any litigation concerning the same, in which case, Tenant
will use its best efforts to keep such information confidential. Except as set
forth in this Section 4(c)(iii), Tenant's disclosure of such information to any
other person shall constitute a material breach of this Lease.

                    (iv) Any errors disclosed by the review of records under
Section 4(c)(i) shall be promptly corrected, provided that Landlord shall have
the right to cause another review of the records to be made by an independent
firm of certified public accountants selected by Landlord. In the event of a
disagreement between Landlord's accounting firm and Tenant's accounting firm, a
third review by an independent firm of certified public accountants of national
standing jointly chosen by Landlord and Tenant shall be made and the
determination of such accounting firm shall be deemed to be correct. The costs
of the third accounting firm shall be shared equally between Landlord and
Tenant, and Tenant's failure to pay its share of such costs shall be a default
under this Lease.

                    (v) In the event that the results of the review of records
(taking into account, if applicable, the results of any additional review caused
by Landlord), reveal that Tenant has overpaid obligations for a preceding
period, the amount of such overpayment shall be credited by Landlord against
subsequent installment obligations to pay its share of estimated Building
Operating Expenses and Building Tax Expenses; provided, however, that if the
amount of credit exceeds the rent due for the balance of the term of this Lease,
Landlord shall pay any excess to Tenant within thirty (30) days after the
expiration of the term of this Lease; provided, further, that Landlord shall
have the right to retain any such excess and apply the same against any sums
which Landlord would otherwise be entitled to receive under this Lease as a
result of any default by Tenant. In the event that such results show that Tenant
has underpaid its obligations for a preceding period, the amount of such
underpayment shall be paid by Tenant to Landlord with the next succeeding
installment obligation of estimated Building Operating Expenses and Building Tax
Expenses.

                    (vi) If the results of the audit procedures described in
this Section 4 disclose that Landlord has overstated the aggregate amount of
Building Operating Expenses and Building Tax Expenses by more than eight percent
(8%) and the parties do not reach agreement on some amount prior to retaining
the third accounting firm described in Section 4(c)(iv) above, Landlord shall
pay Tenant's reasonable and hourly audit costs (as shown on invoices or other
reasonable evidence submitted to Landlord) not to exceed five hundred dollars
($500). Similarly, if the results of the audit procedures described in this
Section 4 above disclose that Landlord has understated the aggregate amount of
Building Operating Expenses and Building Tax Expenses by more than eight percent
(8%) and the parties do not reach agreement on some amount prior to retaining
the third accounting firm described in Section 4(c)(iv) above, Tenant shall pay
Landlord's reasonable and hourly audit costs (as shown on invoices or other
reasonable evidence submitted to Landlord) not to exceed five hundred dollars
($500.00).

                    (vii) In the event that Tenant becomes in default of its
obligations under this Lease at any time during the pendency of a review of
records under this Section (subject to applicable cure periods, if any), said
right to review shall immediately cease and the matters originally set forth in
the Landlord's Statement shall be deemed to be correct.

                                       8
<PAGE>   12

             (d) The amount of Escalation Rent for any partial calendar year in
the Term shall be appropriately prorated. The termination of this Lease shall
not affect the obligations of Landlord and Tenant pursuant to Section 4(c) above
to be performed after such termination.

        5. Use.

             (a) The Premises shall be used for general office purposes and,
solely in connection with Tenant's computer business, laboratory assembly and
testing, and for no other use or purpose. Tenant shall not do or permit to be
done in or about the Premises, nor bring to keep or permit to be brought or kept
therein, anything which is prohibited by or will in any way conflict with any
Laws now in force or which may hereafter be enacted or promulgated, or which is
prohibited by the standard form of fire insurance policy, or will in any way
increase the existing rate of or affect any fire or other insurance upon the
Building or any of its contents, or cause a cancellation of any insurance policy
covering the Project, the Building or any of its contents. Tenant shall not do
or permit anything to be done in or about the Premises which will in any way
obstruct or interfere with the rights of other tenants of the Building, or
injure or annoy them, or use or allow the Premises to be used for any improper,
immoral, unlawful or objectionable purpose, nor shall Tenant cause, maintain or
permit any nuisance or waste in, on or about the Premises.

             (b) Except general office supplies typically used in an office area
in the ordinary course of business, such as copier toner, liquid paper, glue,
ink, and cleaning solvents, for use in the manner for which they were designed,
in such amounts as may be normal for the office business operations conducted by
Tenant in the Premises, neither Tenant nor its agents, employees, contractors,
licensees, subtenants, assignees, concessionaires or invitees shall use, handle,
store or dispose of any "Hazardous Materials" (as hereinafter defined) in, on,
under or about the Premises, the Building or the Project. In the event of a
breach of the foregoing covenant, in addition to and without limitation upon any
other rights or remedies of Landlord under this Lease, Tenant or, at Landlord's
election, Landlord, in each case at Tenant's sole cost, shall promptly take all
actions as are necessary to return the Premises, Building and/or Project to the
condition existing prior to the introduction of any such Hazardous Materials,
provided Landlord's approval of such actions shall first be obtained and Tenant
shall fully cooperate in connection with any such clean-up, restoration or other
work. Furthermore, Tenant shall immediately notify Landlord of any inquiry,
test, investigation or enforcement proceeding by or against Tenant or the
Premises concerning the presence of any Hazardous Materials. Tenant acknowledges
that Landlord, at Landlord's election, shall have the sole right, at Tenant's
expense, to negotiate, defend, approve and appeal any action taken or order
issued by any governmental authority with regard to any Hazardous Materials
contamination which Tenant is obligated hereunder to remediate. As used herein,
"Hazardous Materials" shall mean asbestos, and petroleum fuel, and any hazardous
or toxic substance, material or waste (or subparts thereof) which is or become
regulated by any local governmental authority, the State of California or the
United States Government, including, but not limited to, any material or
substance defined as a "hazardous waste," "extremely hazardous waste,"
"restricted hazardous waste," "hazardous substance," "hazardous material" or
"toxic pollutant" under the California Health and Safety Code and/or under the
Comprehensive Environmental Response, Compensation and Liability Act, 42 U.S.C.
9601, et seq. Landlord represents and warrants to Tenant that Landlord has no
actual knowledge (without any obligation of inquiry or investigation) that
Hazardous Materials exist on or under land on which the Project is located.

        6. Services.

             (a) Landlord shall maintain the Common Areas of the Project, the
exterior facing windows in the Building, the mechanical, plumbing and electrical
equipment serving the Building, and the Building structure itself in reasonably
good order and condition except for damage occasioned by the act of Tenant
and/or any of Tenant's employees, agents, representatives, contractors and/or
invitees, which damage shall be repaired by Landlord at Tenant's expense.

                                       9
<PAGE>   13

             (b) Landlord shall cause to be furnished (1) elevator service, (2)
lighting replacement (for building standard lights located in any Common Areas),
(3) Common Area rest room supplies, and (4) security measures and/or services
and janitor service during the times and in the manner that such services are
customarily furnished in comparable office buildings in the area; provided that
janitor service shall be provided five (5) days a week. The Premises shall be
separately metered for electricity use (including, without limitation,
electricity to provide HVAC service to the Premises) and other utilities at
Tenant's cost, and Tenant shall pay the fees charged for such utility costs, as
additional rent, either (1) prior to delinquency directly to the utility
provider, or (2) if Landlord is billed for such usage by the utility provider,
Tenant shall make such payments to Landlord within ten (10) days following
Landlord's billing of Tenant therefor. Tenant shall also be responsible for the
costs of any and all services, including, without limitation, maintenance,
repair, or replacement, provided to the Premises. Landlord may establish
reasonable measures to conserve energy, including, but not limited to, automatic
switching of lights after hours and more efficient forms of lighting, so long as
such measures do not unreasonably interfere with Tenant's use of the Premises.
Landlord shall not be in default hereunder or be liable for any damages directly
or indirectly resulting from, nor shall the rental herein reserved be abated by
reason of (i) the installation, use or interruption of use of any equipment in
connection with the furnishing of any of the foregoing services, (ii) failure to
furnish or delay in furnishing any such services when such failure or delay is
caused by accident or any condition beyond the reasonable control of Landlord or
by the making of necessary repairs or improvements to the Premises, Building or
Project, or (iii) the limitation, curtailment, rationing or restrictions on use
of water, electricity, gas or any other form of energy or utility serving the
Premises, Building or Project. Landlord shall use reasonable efforts diligently
to remedy any interruption in the furnishing of such services. Notwithstanding
the foregoing, if failure to provide any service or utility required of Landlord
under this Lease is due to the gross negligence or wilful misconduct of Landlord
and such failure shall continue for five (5) consecutive business days or more,
and provided such failure to provide the required service precludes Tenant from
occupying all or any portion of the Premises, then Base Rent shall be abated
hereunder at the rate of one day's Base Rent for each day of such interruption;
provided, that in the event Tenant occupies some, but not all of the Premises
during such interruption in services, the abatement afforded Tenant shall be a
proportion of daily Base Rent equal to a fraction, the denominator of which is
the Rentable Area of the Premises and the numerator of which is the Rentable
Area of the portion of the Premises that is not occupied by Tenant during such
interruption.

             (c) If heat-generating equipment or lighting other than building
standard lights are installed or used in the Premises and such equipment or
lighting affects the temperature otherwise maintained by the air conditioning
system, or if equipment is installed in the Premises which requires separate
temperature-controlled room, at Landlord's election after notice to Tenant,
Landlord shall install supplementary air conditioning facilities in the Premises
or otherwise modify the ventilating and air conditioning system serving the
Premises, and the capital and maintenance costs of such facilities and
modifications shall be borne by Tenant.

             (d) Tenant shall reimburse Landlord, upon billing thereof, for the
cost of (i) all electricity, power and cooling energy for heat or air
conditioning provided to the Premises, at the then prevailing rate therefor
established by Landlord. Tenant shall also pay the cost of any transformers,
additional risers, panel boards and other facilities if and to the extent
required to furnish power for supplementary air conditioning facilities in or
serving the Premises or power for lighting and office equipment.

             (e) In the event that Landlord, at Tenant's request, provides
services to Tenant that are not otherwise provided for in this Lease, Tenant
shall pay Landlord's reasonable charges for such services upon billing thereof.

             (f) Subject to Force Majeure, Landlord's rules and regulations,
other matters relating to Building and Project security, and related issues as
reasonably adopted by Landlord from time to time, Tenant shall have access to
the Premises (and the Project as necessary to access the Premises) twenty-four
(24) hours a day, three hundred sixty-five (365) days a year. Landlord shall

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<PAGE>   14

provide Tenant with use of the key card access system, if any, existing at the
Building as of the Commencement Date, and Landlord shall maintain such key card
system, if any, in good operating condition and repair; provided, however, that
Landlord may in its sole and absolute discretion remove any such key card access
system from the Building.

             (g) Tenant acknowledges that this Lease is what is commonly known
as a "triple net" lease, and that Tenant shall be responsible for the payment of
any and all costs and expenses of any and all services provided to the Premises
by Landlord or others, regardless of whether or not this Lease states that such
costs shall be paid by Tenant.

        7. Impositions Payable by Tenant. In addition to the monthly rental and
other charges to be paid by Tenant hereunder, Tenant shall pay or reimburse
Landlord for any and all of the following items (hereinafter collectively
referred to as "Impositions"), whether or not now customary or in the
contemplation of the parties hereto: taxes (other than local, state and federal
personal or corporate income taxes measured by the net income of Landlord from
all sources), assessments (including, without limitation, all assessments for
public improvements, services or benefits, irrespective of when commenced or
completed), excises, levies, business taxes, license, permit, inspection and
other authorization fees, transit development fees, assessments or charges for
housing funds, service payments in lieu of taxes and any other fees or charges
of any kind, which are levied, assessed, confirmed or imposed by any public
authority, but only to the extent the Impositions are (a) upon, measured by or
reasonably attributable to the cost or value of Tenant's equipment, furniture,
fixtures and other personal property located in the Premises, or the cost or
value of any leasehold improvements made in or to the Premises by or for Tenant,
regardless of whether title to such improvements shall be in Tenant or Landlord
(b) upon or measured by the monthly rental or other charges payable hereunder,
including, without limitation, any gross receipts tax levied with respect to the
receipt of such rental (c) upon, with respect to or by reason of the
development, possession, leasing, operation, management, maintenance,
alteration, repair, use or occupancy by Tenant of the Premises or any portion
thereof or (d) upon this transaction or any document to which Tenant is a party
creating or transferring an interest or an estate in the Premises. In the event
that it shall not be lawful for Tenant to reimburse Landlord for the Impositions
but it is lawful to increase the monthly rental to take into account Landlord's
payment of the Impositions, the monthly rental payable to Landlord shall be
revised to net Landlord the same net return without reimbursement of the
Impositions as would have been received by Landlord with reimbursement of the
Impositions.

        8. Alterations.

             (a) Tenant shall not make or suffer to be made any alterations,
additions or improvements to the Premises (collectively, "Alterations"), without
Landlord's prior consent, which consent shall not be unreasonably withheld
(except that such consent may be granted or withheld in Landlord's sole and
absolute discretion as to any proposed Alterations which would affect the
Building exterior, structural components or utility or life-safety systems). For
purposes hereof, "Alterations" shall include, without limitation, air lines,
power panels, electrical distribution, security, fire protection systems,
communications (including, without limitation, telephone lines), lighting
fixtures, heating, ventilating and air conditioning equipment, plumbing, and
fencing, in, on or about the Premises. Notwithstanding the foregoing, Tenant may
make cosmetic alterations to the Premises, the cost of which do not exceed ten
thousand dollars ($10,000.00), without Landlord's consent as long as (i) Tenant
provides Landlord with at least thirty (30) days' notice thereof and (ii) such
changes are not visible from outside the Building and do not affect in any way
the Building exterior, structural components or utility or life-safety systems
of the Building. All Alterations shall be made by Landlord for Tenant's account
in accordance with the procedures set forth in this Section. All Alterations
shall immediately become Landlord's property and, at the end of the Term hereof,
shall remain on the Premises without compensation to Tenant unless Landlord
elects by notice to Tenant to require the removal of any such Alterations, in
which event Tenant shall be responsible for the cost of Landlord's removal of
such Alterations and restoration of the Premises to its condition prior to the
installation of such Alterations. Notwithstanding the foregoing, Tenant may

                                       11

<PAGE>   15

include the following notice (in bold, all capitalized twelve point type) in its
request for consent to an Alteration: "LANDLORD'S RESPONSE TO THIS REQUEST FOR
CONSENT MUST INCLUDE LANDLORD'S ELECTION TO REQUIRE TENANT TO REMOVE THE SUBJECT
ALTERATION AT THE EXPIRATION OF THE LEASE TERM OR LANDLORD WILL BE DEEMED TO
HAVE WAIVED ITS RIGHT TO REQUIRE TENANT TO REMOVE SAID ALTERATION". Tenant shall
not be required to remove the Alteration at the expiration of the Term if the
foregoing language was included in Tenant's request for consent and Landlord
failed to make such election in its response thereto; provided, however, that
Landlord's waiver, if any, shall automatically (and retroactively) be void if
this Lease terminates as a result of Tenant's default.

             (b) Plans and specifications for the Alterations shall be prepared
at Tenant's expense by either its architect or Landlord's architect if Tenant so
elects, and by engineers approved by Landlord where mechanical or electrical
engineering services are required by the nature of the Alterations. Tenant shall
cause any architect retained by it to follow the standard construction
administration procedures and to utilize the standard specifications and details
promulgated by Landlord for the Building. The plans and specifications shall be
subject to approval by Landlord and Tenant, which approval shall not be
unreasonably withheld by either party, and following such approval Landlord
shall obtain quotations of the cost of the Alterations as reflected by the
approved plans and specifications from one or more general contractors approved
by Landlord for construction in the Building. Landlord shall submit the
quotations to Tenant, shall accept the quotations approved by Tenant, and shall
proceed to enter into a contract for the construction or installation of the
Alterations with the contractor whose quotation was approved by Tenant. Landlord
itself does not warrant the cost of the Alterations or the timeliness of
performance or the quality of the contractor's work, but Landlord shall use
reasonable efforts to secure performance of the construction contract for
Tenant's benefit.

             (c) In the event Landlord or the contractor is instructed by Tenant
to proceed with any changes to the alterations without a prior determination of
any increased costs resulting from such changes and without approval of such
increases by Tenant, or in the event Tenant is responsible for increased costs
attributable to a delay or acceleration in the time for construction, the amount
of any increased costs shall be as reasonably determined by Landlord upon
completion of the Alterations, subject only to Landlord's reasonable efforts in
causing the contractor to furnish Tenant appropriate back-up information
concerning increased costs, if any.

             (d) The cost of the Alterations to be paid by Tenant shall include
a reasonable charge for the administration by Landlord or its agent of the
construction or installation of the Alterations, which Landlord and Tenant agree
shall be ten percent (10%) of the total costs of design and construction.

             (e) Tenant shall pay to Landlord all amounts payable by Tenant
pursuant to this Section within fifteen (15) days after billing by Landlord.
Bills may be rendered in advance of or during the progress of the Alterations so
as to enable Landlord to pay the contractor, architect or engineer without
advancing Landlord's own funds. At Landlord's election, Tenant shall deposit
with Landlord prior to the commencement of the Alterations the estimated cost
thereof or such lesser portion as Landlord shall specify, to be held and applied
to the cost as incurred. Any surplus funds shall be returned to Tenant when the
Alterations have been paid for in full.

             (f) Landlord may delegate some or all of its authority and
responsibilities under this Section 8 to its managing agent, which may be an
affiliate of Landlord.

        9. Liens. Tenant shall keep the Premises, Building and Project free from
any liens arising out of any work performed, materials furnished or obligations
incurred by or on behalf of Tenant. Landlord shall have the right to post and
keep posted on the Premises any notices that may be provided by law or which
Landlord may deem to be proper for the protection of Landlord, the Premises,
Building and/or Project from such liens. Tenant shall remove any such lien by
bond or otherwise within ten (10) days after notice from Landlord, and if Tenant
shall fail to do so, Landlord may, but shall not be obligated to, pay the amount
necessary to remove such lien without being

                                       12
<PAGE>   16

responsible for investigating the validity thereof. Any amount so paid by
Landlord shall be deemed additional rent under this Lease payable upon demand,
without limitation as to other remedies available to Landlord under this Lease.
Nothing contained in this Lease shall authorize Tenant to do any act which shall
subject Landlord's title to the Premises, Building or Project to any liens
whether claimed by operation of law or express or implied contract.

        10. Repairs. By entry hereunder Tenant accepts the Premises as being in
the condition in which Landlord is obligated to deliver the Premises, subject to
any applicable provisions of Exhibit "C". Tenant shall, at all times during the
Term and at Tenant's sole cost and expense, keep the Premises (including,
without limitation, any Tenant Improvements, Alterations and Tenant's furniture,
fixtures, equipment and personal property in the Premises) in good condition and
repair (regardless of the cost therefor and/or the time remaining on the Term),
ordinary wear and tear, damage thereto by fire (unless caused by or contributed
to by Tenant), earthquake, act of God or the elements excepted. Tenant hereby
waives all rights to make repairs at the expense of Landlord or in lieu thereof
to vacate the Premises and all rights under Sections 1932(1), 1941 and 1942 of
the California Civil Code or any successor statute. Tenant shall at the end of
the Term surrender to Landlord the Premises and all Alterations thereto that are
to remain in the Premises in the same condition as when received, ordinary wear
and tear and damage by fire (unless the same is caused by or contributed to by
Tenant), earthquake, act of God or the elements excepted. Tenant shall remove
all of its personal property and equipment from the Premises prior to the
expiration of the Term or earlier termination of this Lease, and if Tenant fails
to remove the same, Landlord may do so and store or dispose of the same at
Tenant's sole cost. Landlord has no obligation and has made no promise to alter,
remodel, improve, repair, decorate or paint the Premises, except as specifically
otherwise provided in this Lease. No representations respecting the condition of
the Premises, the Building or the Project have been made by Landlord to Tenant,
except as specifically provided in this Lease.

        11. Destruction or Damage.

             (a) In the event the Premises or the portion of the Building
necessary for Tenant's occupancy are damaged by fire, earthquake, act of God,
the elements or other casualty, within sixty (60) days after such event,
Landlord shall notify Tenant of the estimated time, in Landlord's reasonable
judgment, required for repair or restoration. If such estimated time for repair
or restoration is less than one hundred eighty (180) days after the date of
casualty and the cost of repair is covered by insurance maintained by Landlord,
Landlord shall forthwith repair or restore the Premises or the portion of the
Building necessary for Tenant's occupancy, to the extent of insurance proceeds
received on account of such casualty. If the time for repair or restoration is
in excess of one hundred eighty (180) days after the date of casualty or the
cost of repair is not covered by Landlord's insurance, Landlord shall elect, in
the same notice Tenant, either (i) to repair or restore the Premises or the
portion of the building necessary for Tenant's occupancy, in which event this
Lease shall continue in full force and effect (unless Tenant exercises its right
to terminate this Lease as provided below), or (ii) to terminate this Lease, in
which event this Lease shall terminate as of the date of such fire or other
casualty. In the event Landlord is obligated or elects to repair the Premises
pursuant to this Section 11 (unless Tenant exercises its right to terminate this
Lease as provided below), this Lease shall remain in full force and effect
except that, if such damage is not the result of the act or omission of Tenant
or Tenant's employees, agents, representatives, contractors or invitees, an
abatement of rental shall be allowed Tenant for such part of the Premises as
shall be rendered unusable by Tenant (but only to the extent actually not used
by Tenant) in the conduct of its business during the time such part is so
unusable. Notwithstanding the foregoing, if Landlord's estimate states that the
repair or restoration of the subject casualty damage will take longer than
twelve (12) calender months to substantially complete, then Tenant shall have
the right to terminate this Lease by written notice delivered to Landlord within
five (5) days following the date of Landlord's estimate, and Tenant's failure to
deliver such termination notice shall be deemed an election by Tenant not to
terminate the Lease.

             (b) Notwithstanding anything to the contrary contained in this
Section 11, in the event of casualty to the Premises or the portion of the
Building necessary for Tenant's occupancy during the final 12 months of the

                                       13
<PAGE>   17

Term which is estimated by Landlord in good faith to require in excess of thirty
(30) days to repair or restore (with respect to Landlord's termination right) or
ninety (90) days to repair or restore (with respect to Tenant's termination
right), then either Landlord or Tenant may elect to terminate this Lease by
written notice to Tenant delivered within five (5) days of the date of
Landlord's estimate.

             (c) If the Premises or the Building are to be repaired or restored
under this Section 11, Landlord shall repair or restore the Building and all
improvements in the Premises other than any of Tenant's furniture, fixtures,
equipment, personal property, and any Tenant Improvements and Alterations made
by or for Tenant. Tenant shall be responsible for the repair or restoration of
any such Tenant's furniture, fixtures, equipment, personal property, and any
Tenant Improvements and Alterations made by or for Tenant, provided that any
repair of such Tenant Improvements or Alterations shall be performed by
Landlord, at Tenant's cost.

             (d) Landlord and Tenant acknowledge that their respective rights
and obligations in the event of any damage to or destruction of the Premises or
the Building are to be governed exclusively by this Lease and waive their
respective rights under Sections 1932(2) and 1933(4) of the California Civil
Code or any successor statute.

        12. Insurance.

             (a) Tenant shall, during the Term hereof and any other period of
occupancy, at its sole cost and expense, keep in full force and effect the
following insurance:

                    (1) All Risk insurance (including, without limitation,
sprinkler leakage and earthquake sprinkler leakage endorsements) upon property
of every description and kind owned by Tenant and located in the Building or for
which Tenant is legally liable or installed by or on behalf of Tenant,
including, without limitation, furniture, fixtures, personal property, any
Tenant Improvements (pursuant to Exhibit "C") and Alterations, in an amount not
less than ninety-five percent (95%) of the full replacement cost thereof, and
providing business interruption coverage for a period of one year. All such
insurance policies shall name Tenant as named insured thereunder, shall name
Landlord, and, at Landlord's request, Landlord's "Mortgagees" (as defined in
Section 23 below), as loss payees thereunder, all as their respective interests
may appear. Not less frequently than once every three (3) years, Landlord shall
have the right to notify Tenant that it elects to have the replacement value
redetermined by an insurance company or insurance consultant. The
redetermination shall be made promptly and in accordance with the rules and
practices of the Board of Fire Underwriters, or a like board recognized and
generally accepted by the insurance company, and each party shall be promptly
notified of the results by the company. The insurance required under this Lease
shall be adjusted according to the redetermination.

                    (2) Commercial general liability insurance coverage,
including personal injury, bodily injury, broad form property damage and
contractual liability (covering the indemnity contained in Section 13), in
amount not less than $1,000,000.00 per occurrence, $2,000,000.00 aggregate. All
such insurance policies shall name Tenant as named insured thereunder and shall
name Landlord and Landlord's managing agent and Mortgagees as additional
insureds thereunder. Such insurance shall be written as primary coverage and
non-contributing with respect to any insurance maintained by Landlord.

                    (3) Workers' Compensation and Employer's Liability Insurance
in form and amounts not less than that required by applicable law, but in no
event will the coverage provided under Tenant's Employer's Liability Insurance
be less than five hundred thousand dollars ($500,000.00) or such other amount as
Landlord may be reasonably require.

                    (4) Any other form or forms of insurance as Landlord may
reasonably require from time to time in form, in amounts, and for insurance
risks against which a prudent tenant of a comparable size and in a comparable
business would protect itself.

             (b) All policies shall be written in a form reasonably satisfactory
to Landlord and shall be taken out with insurance companies

                                       14
<PAGE>   18

admitted in the State of California holding a General Policyholders Rating of
"A-" and a Financial Rating of VII or better, as set forth in the most current
issue of Best's Insurance Reports. Prior to the date Tenant takes possession of
any part of the Premises, Tenant shall deliver to Landlord copies of policies or
certificates evidencing the existence of the amounts and forms of coverage
required hereunder, and said certificates shall provide that no such policy
shall be cancelable or reducible in coverage except after thirty (30) days'
prior written notice to Landlord and any additional insureds or loss payees
thereunder. Tenant shall, within ten (10) days prior to the expiration of such
policies, furnish Landlord with renewals or binders thereof, or if Tenant fails
to do so, Landlord may order such insurance and charge the cost thereof shall be
due from Tenant to Landlord upon demand as additional rent.

             (c) During the Term, Landlord shall insure the Project (excluding
any property which Tenant is obligated to insure under Sections 12(a) above)
against damage with All Risk insurance and comprehensive general liability
insurance, in such amounts and with such deductibles as Landlord considers
appropriate. Landlord may, but shall not be obligated to, obtain and carry any
other form or forms of insurance as it deems advisable. Notwithstanding any
contribution by Tenant to the cost of insurance premiums as provided herein,
Tenant acknowledges that it has no right to receive any proceeds from any
insurance policies carried by Landlord.

             (d) If Tenant's occupancy or business in or upon the Premises,
whether or not Landlord has consented to the same, results in any increase in
premiums for the insurance periodically carried by Landlord with respect to the
Building or the Project, Tenant shall pay as additional rent any such increase
in premiums within ten (10) days after being billed therefor by Landlord.

             (e) All policies of insurance required hereunder, including,
without limitation, Workers' Compensation and Employer's Liability insurance,
shall include a clause or endorsement denying the insurer any rights of
subrogation against the other party to the extent rights have been waived by the
insured before the occurrence of injury or loss. Landlord and Tenant waive any
rights of recovery against the other for injury or loss due to hazards covered
by policies of insurance, including, without limitation, Workers' Compensation
and Employers' Liability insurance, to the extent insurance proceeds cover the
injury or loss.

        13 Indemnification. Tenant hereby waives all claims against Landlord for
damage to any property or injury or death of any person in, upon or about the
Premises or Project arising at any time and from any cause other than by reason
of gross negligence or wilful misconduct of Landlord, its employees, agents or
representatives. Tenant shall indemnify, defend and hold harmless Landlord from
and against any and all claims, demands, losses, liabilities, damages, costs
and/or expenses (including, without limitation, reasonable attorneys' fees and
expenses) arising out of (a) any injury to or death of any person or damage to
or destruction of property attributable to or resulting from the use of the
Premises by Tenant, except such as is caused by gross negligence or willful
misconduct of Landlord, its employees, agents or representatives, (b) the acts
or omissions of Tenant or any of Tenant's employees, agents, representatives or
invitees (including, without limitation, acts or omissions with respect to
Hazardous Materials), and/or (c) any breach of this Lease by Tenant. The
provisions of this Section shall survive the expiration of the Term or earlier
termination of this Lease.

        14. Compliance with Legal Requirements. Tenant, at its sole cost and
expense (regardless of the cost therefor or the time remaining on the term),
shall promptly comply with all Laws (including, without limitation, Laws
respecting accessibility or use of the Premises by disabled persons) now in
force or which may hereafter be in force, with the requirements of any board of
fire underwriters or other similar body now or hereafter constituted, with any
directive or occupancy certificate issued pursuant to any Law by any public
officer or officers, as well as the provisions of all recorded documents
affecting the Premises, insofar as any thereof relate to or affect the
condition, use or occupancy of the Premises, excluding structural changes to the
Premises or Building required to comply therewith, which structural changes
shall be performed by Landlord as an item of Operating Expenses in accordance
with Section l(d) above (except that Tenant shall be solely responsible for the
cost of such structural changes as additional rent within

                                       15
<PAGE>   19

ten (10) days following Landlord's demand, to the extent such structural changes
are required as a result of Tenant's acts, specific use of the Premises, or
improvements or Alterations made by or for Tenant). Notwithstanding the
foregoing, Tenant shall not be required to pay any cost or expense, either
directly or as part of Operating Expenses, for causing the Project, or any
portion thereof, as the same exist on the Commencement Date, to comply with
applicable Laws (including, without limitation, the Americans with Disabilities
Act) as such Laws are in effect on the Commencement Date; provided, however,
that Tenant will be responsible for any such compliance costs which result from
Tenant's specific use of the Premises and/or from the existence of any
improvements and/or Alterations constructed by or on behalf of Tenant.

        15. Assignment and Subletting.

             (a) Tenant shall not, without the prior consent of Landlord, which
consent shall not be unreasonably withheld, assign or hypothecate this Lease or
any interest herein, sublet the Premises or any part thereof, or permit the use
of the Premises by any party other than Tenant. This Lease shall not, nor shall
any interest herein, be assignable as to the interest of Tenant by operation of
law without the consent of Landlord, which consent shall not be unreasonably
withheld. Any of the foregoing acts without such consent shall be void and
shall, at the option of Landlord, terminate this Lease. For purposes hereof, in
the event Tenant is a partnership, a withdrawal or change of the managing
partner, or partners owning more than a controlling interest in the partnership
in one or more transfers, or if Tenant is a corporation, any transfer of a
majority of its stock in one or more transfers, or the transfer by the
controlling shareholder of so much of its stock that it is no longer the
controlling shareholder, shall constitute a voluntary assignment and shall be
subject to the provisions of this Section 15; provided, however, that in the
case of a transfer of a majority of a corporation's stock, Tenant may,
concurrently with Tenant's written notice to Landlord of any such transfer
(which shall be delivered not less than thirty (30) days prior to the effective
date thereof), increase its security deposit to an amount which is equal to six
(6) months' then current Base Rent, in which case Landlord's consent to such
voluntary assignment shall not be required. In connection with each consent
requested by Tenant, Tenant shall submit to Landlord not less than twenty (20)
days prior to the effective date of the proposed transaction, the terms of the
proposed transaction, the identity of the parties to the transaction, the
proposed documentation for the transaction and all other information reasonably
requested by Landlord concerning the proposed transaction and the parties
involved therein. Within sixty (60) days of receipt of such request for consent
and other required information, Landlord shall elect either to: (i) consent to
such proposed transaction (ii) refuse such consent, which refusal shall be on
reasonable grounds or (iii) elect to terminate this Lease effective as of the
date Tenant proposes to assign this Lease or sublet all of the Premises, or in
the case of sublease of twenty-five percent (25%) or more of the Rentable Area
of the Premises for more than twelve (12) months, terminate this Lease as to the
portion of the Premises proposed to be sublet as of the date of such proposed
partial sublease. Nothing contained in this Section 15 shall be deemed a waiver
of Landlord's right to elect to terminate this Lease in accordance with clause
(iii) of the foregoing sentence including, but not limited to, Landlord's
failure to exercise its right to terminate this Lease with respect to any
previous assignment or subletting. Further, Tenant understands and acknowledges
that Landlord's option to terminate this Lease rather than approve the
assignment thereof or the subletting of all or any portion of the Premises, is a
material inducement for Landlord's agreeing to lease the Premises to Tenant upon
the terms and conditions herein set forth. Notwithstanding the foregoing,
Landlord shall respond to Tenant's request for consent to an assignment or
subletting within thirty (30) days if (i) Tenant includes the following notice
(in bold, all capitalized twelve point type) in its request for consent:
"LANDLORD MUST RESPOND TO THIS REQUEST FOR CONSENT WITHIN THIRTY (30) DAYS
FOLLOWING ITS RECEIPT HEREOF" and (ii) such request by Tenant otherwise complies
with the requirements of this Section 15.

             (b) Without limiting the other instances in which it may be
reasonable for Landlord to withhold its consent to an assignment or subletting,
Landlord and Tenant acknowledge that it shall be reasonable for Landlord to
withhold its consent in the following instances: (1) if at the time consent is
requested or at any time prior to the granting of consent,

                                       16
<PAGE>   20

Tenant is in default under this lease or would be in default under this Lease
but for the pendency of any grace or cure period under Section 18 below (2) if
the proposed assignee or subtenant is a governmental agency (3) if the proposed
assignee or subtenant is an existing tenants in the Project or Landlord is then
or within the prior 6 months has been negotiating with such assignee or
subtenant for the lease of space within the Project (4) if, in Landlord's
reasonable judgment, the use of the Premises by the proposed assignee or
subtenant would not be comparable to the types of office use by other tenants in
the Project, would entail any alterations which would lessen the value of the
leasehold improvements in the Premises, would result in more than a reasonable
number of occupants per floor, or would require increased services by Landlord
(5) if, in Landlord's reasonable judgment, the financial worth of the proposed
assignee or subtenant does not meet the credit standards applied by Landlord for
other tenants under leases with comparable terms, or the character, reputation,
or business of the proposed assignee or subtenant is not consistent with the
quality of the other tenancies in the Building or (6) if the subletting is of
less than the entire Premises.

             (c) In the case of an assignment, one-half of any sums or other
economic consideration received by Tenant as a result of such assignment shall
be paid to Landlord after first deducting the unamortized cost of leasehold
improvements paid for by Tenant, and the cost of any real estate commissions and
other generally recognized and available concessions incurred by Tenant in
connection with such assignment. In the case of a subletting, one-half of any
sums or economic consideration received by Tenant as a result of such subletting
shall be paid to Landlord after first deducting (1) the rental due hereunder,
prorated to reflect only rental allocable to the sublet portion of the Premises,
(2) the cost of leasehold improvements made to the sublet portion of the
Premises at Tenant's cost, amortized over the term of this Lease except for
leasehold improvements made for the specific benefit of the subtenant, which
shall be amortized over the term of the sublease, and (3) the cost of any real
estate commissions and other generally recognized and available concessions
incurred by Tenant in connection with such subletting, amortized over the term
of the sublease.

             (d) Regardless of Landlord's consent, no subletting or assignment
shall release Tenant of Tenant's obligation or alter the primary liability of
Tenant to pay the rental and to perform all other obligations to be performed by
Tenant hereunder. The acceptance of rental by Landlord from any other person
shall not be deemed to be a waiver by Landlord of any provision hereof. Consent
to one assignment or subletting shall not be deemed consent to any subsequent
assignment or subletting or a waiver of any of the terms of this Lease. No
assignee or subtenant shall have a right further to assign or sublet without
Landlord's prior consent in accordance with this Section 15. No sublease, once
consented to by Landlord, shall be modified or terminated by Tenant without
Landlord's prior consent, which consent shall not be unreasonably withheld. In
the event of default by any assignee of Tenant or any successor of Tenant in the
performance of any of the terms hereof, Landlord may proceed directly against
Tenant without the necessity of exhausting remedies against such assignee or
successor. Landlord may consent to subsequent assignments or subletting of this
Lease or amendments or modifications to this Lease with assignees of Tenant,
without notifying Tenant, or any successor of Tenant, and without obtaining its
or their consent thereto, and such action shall not relieve Tenant of liability
under this Lease.

             (e) A condition to Landlord's consent to any assignment or other
transfer of this Lease shall be the delivery to Landlord of a true copy of the
fully executed instrument of assignment or transfer, and the delivery to
Landlord of an agreement executed by the assignee or transferee in form and
substance satisfactory to Landlord and expressly enforceable by Landlord,
whereby the assignee or transferee assumes and agrees to be bound by all of the
provisions of this Lease and to perform all of the obligations of Tenant
hereunder. As a condition to Landlord's consent to any sublease, Landlord may
require that such sublease include among other items, provisions stating (i)
that it is subject and subordinate to this Lease and to all Mortgages and ground
leases affecting the Project, (ii) Landlord shall be a third party beneficiary
of the obligations of Tenant's subtenant and may enforce the terms of said
sublease against said subtenant, and (iii) that in the event of a termination of
this Lease for any reason, including without limitation, a voluntary surrender
by Tenant or mutual cancellation by Landlord and Tenant,

                                       17
<PAGE>   21

or in the event of any re-entry or repossession of the Premises by Landlord,
such sublease shall terminate, except that Landlord, at its option, may elect to
continue such sublease in effect and require that such subtenant attorn to and
recognize Landlord as its landlord under such sublease.

             (f) In the event Tenant shall assign this Lease or sublet the
Premises or request the consent of Landlord to any assignment, subletting,
hypothecation or other action requiring Landlord's consent hereunder, then
Tenant shall pay Landlord's reasonable attorneys' fees incurred in connection
therewith.

             (g) Notwithstanding the foregoing, the original Tenant hereunder
may without Landlord's consent assign its interest in this Lease or sublet all
or a portion of the Premises to any affiliate of Tenant provided that (i) Tenant
gives Landlord thirty (30) days prior written notice and delivers to Landlord
concurrently with such notice all of the information which would otherwise be
required in connection with a request for consent, (ii) the transaction complies
with the provisions of Section 15(e) above and (iii) the assignee or subtenant
has a financial worth sufficient, in Landlord's reasonable and good faith
determination, to fulfil the obligations of Tenant under this Lease; provided,
however, Landlord shall evaluate financial worth using the same standards
Landlord then applies to similar tenants under leases with comparable terms, in
each case as reasonably determined by Landlord. For purposes of the preceding
sentence, an "affiliate" means any person or entity that directly, or indirectly
through one or more intermediaries, controls or is controlled by, or is under
common control with, Tenant. The original Tenant hereunder shall also have the
right, without Landlord's consent, to (i) assign its interest in this Lease to a
corporation (or other business entity) into which it may merge or which may
otherwise succeed to all or substantially all of said original Tenant's assets
or (ii) to a one (1) time transfer of a majority of its stock (through one or a
series of transactions) to any person or entity that is not an affiliate of
Tenant, provided that, in each case, (x) Tenant provides Landlord with written
notice of such assignment within ten (10) days following the completion thereof,
(y) the transaction complies with the provisions of Section 15(e) above, and (z)
the assignee, after giving effect to said merger or acquisition of assets, has a
financial worth sufficient, in Landlord's reasonable and good faith
determination, to fulfil the obligations of Tenant under this Lease; provided,
however, that Landlord shall evaluate financial worth using the same standards
Landlord then applies to similar tenants under leases with comparable terms, in
each case as reasonably determined by Landlord. Any assignment or subletting
which does not, in Landlord's reasonable and good faith determination, comply
with the conditions of stated in this Section 15(g) shall be deemed to be void
and of no force or effect.

        16. Rules. Tenant shall faithfully observe and comply with the rules and
regulations attached hereto as Exhibit "D", and after notice thereof, all
reasonable modifications thereof and additions thereto from time to time
promulgated in writing by Landlord, which may include parking regulations
designed to ensure more orderly and efficient parking at the Project. Landlord
shall not be responsible to Tenant for the nonperformance by any other tenant or
occupant of the Building or the Project of any such rules and regulations.
Landlord shall endeavor to enforce said rules and regulations in a
non-discriminatory manner.

        17. Entry by Landlord. Landlord may enter the Premises at reasonable
hours and, except in the case of a perceived emergency, after reasonable notice
(but in no event shall more than one (1) day's notice be required), to (a)
inspect the same (b) exhibit the same to prospective purchasers, lenders or
tenants (c) determine whether Tenant is complying with its obligations under
this Lease (d) supply janitor service and any other service to be provided by
Landlord to Tenant hereunder (e) post notices on non-responsibility (f) make
repairs or perform maintenance required of Landlord under the terms hereof, make
repairs to any adjoining space or utility services, or make repairs, alterations
or improvements to any other portion of the Building or (g) cure any default in
the performance of Tenant's obligations under this Lease pursuant to Section 19
(c) below provided, however, that all such work shall be done as promptly as
reasonably possible and so as to minimize unreasonable interference with the
operation of Tenant's business from the Premises to the extent reasonably
practicable. Tenant

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<PAGE>   22

hereby waives any claim for damages for any inconvenience to or interference
with Tenant's business or any loss of occupancy or quiet enjoyment of the
Premises occasioned by such entry. Landlord shall at all times have and retain a
key with which to unlock all of the doors in, on or about the Premises
(excluding Tenant's vaults, safes and similar areas designated in writing by
Tenant in advance) and Landlord shall have the right to use any and all means
which Landlord may deem proper to open Tenant's doors in an emergency in order
to obtain entry to the Premises, and any entry to the Premises obtained by
Landlord in an emergency shall not be construed or deemed to be a forcible or
unlawful entry into or a detainer of the Premises or an eviction, actual or
constructive, of Tenant from the Premises or any portion thereof.

        18 Tenant's Default. The following events shall constitute events of
default under this Lease:

             (a) a failure by Tenant to pay when due any rent or other sum
payable hereunder and the continuation of such default for a period of three (3)
days after written notice that the same is due;

             (b) a failure by Tenant to perform any of the other terms,
covenants, agreements or conditions contained herein, and, if the failure is
curable, the continuation of such failure for a period of fifteen (15) days
after notice by Landlord; provided, however, that if the nature of Tenant's
obligation is such that more than fifteen (15) days are required for
performance, then Tenant shall not be in default if Tenant commences performance
within such fifteen (15) day period and thereafter diligently prosecutes the
same to completion;

             (c) the bankruptcy or insolvency of Tenant, transfer by Tenant in
fraud of creditors, an assignment by Tenant for the benefit of creditors, or the
commencement of any proceedings of any kind by or against Tenant under any
provision of the Federal Bankruptcy Act or under any other insolvency,
bankruptcy or reorganization act unless, in the event any such proceedings are
involuntary, Tenant is discharged from the same within sixty (60) days
thereafter;

             (d) the appointment of a receiver for a substantial part of the
assets of Tenant;

             (e) the abandonment of the Premises for a period of twenty (20)
consecutive days or more (or an aggregate of forty (40) days during any three
(3) calendar months) and a concurrent failure to pay rent;

             (f) the levy upon this Lease or any estate of Tenant hereunder by
any attachment or execution and the failure to have such attachment or execution
vacated within thirty (30) days thereafter; or

             (g) the breach or default by Tenant or an affiliate of Tenant under
any other lease or other agreement under which Tenant or such affiliate occupies
or previously occupied other space at the Project.

        Any notice of default to be given pursuant to this Section 18 shall be
in lieu of, and not in addition to, any notice required under California Code of
Civil Procedure Section 1161 or any similar or successor statute.

        19. Landlord's Remedies.

             (a) In the event of any default by Tenant pursuant to Section 18
above, in addition to any other remedies available to Landlord at law or in
equity, Landlord shall have the immediate option to terminate this Lease and all
rights of Tenant hereunder. In the event that Landlord shall elect to so
terminate this Lease, then Landlord may recover from Tenant: (i) the worth at
the time of award of any unpaid rent which had been earned at the time of such
termination plus (ii) 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 proves could have been
reasonably avoided plus (iii) 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 proves could be reasonably
avoided plus (iv) any other amount necessary to compensate Landlord

                                       19
<PAGE>   23

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.

             As used in clauses (i) and (ii) of this Section 19(a) above, the
"worth at the time of award" is computed by allowing interest at the Interest
Rate. As used in clause (iii) of this Section 19(a) above, the "worth at the
time of award" is computed by discounting such amount at the discount rate of
the Federal Reserve Bank of San Francisco at the time of award plus 1%.

             (b) In the event of any such default by Tenant and/or Tenant's
abandonment of the Premises (as defined in Section 18(d) above), Landlord shall
also have the right to reenter the Premises and remove all persons and property
therefrom by summary proceedings or otherwise such property may be removed and
stored in a public warehouse or elsewhere at the cost of and for the account of
Tenant or disposed of in a reasonable manner by Landlord. In the event Landlord
shall elect to reenter as provided above, or shall take possession of the
Premises pursuant to legal proceedings or pursuant to any notice provided by
law, and if Landlord does not elect to terminate this Lease as provided by law,
then Landlord may from time to time, without terminating this Lease, either
recover all rental as it becomes due or relet the Premises or any part thereof
for such term and at such rental or rentals and upon such other terms and
conditions as Landlord in its sole discretion may deem advisable, with the right
to make alterations and repairs to the Premises. It is the intention of the
parties that in addition to, and without limitation upon, all other rights and
remedies set forth in this Lease, Landlord shall have the remedy described in
California Civil Code Section 1951.4 (lessor may continue lease in effect after
lessee's breach and abandonment and recover rent as it becomes due). In the
event that Landlord shall elect to relet, then rentals received by Landlord from
such reletting shall be applied first, to the payment of any indebtedness, other
than Base Rent due hereunder, owed by Tenant to Landlord second, to the payment
of any cost of such reletting third, to the payment of the cost of any
alterations and repairs to the Premises fourth, to the payment of Base Rent due
and unpaid hereunder and the residue, if any, shall be held by Landlord and
applied in payment of future rent as the same may become due and payable
hereunder. Should that portion of such rentals received from such reletting
during any month, which is applied to the payment of rent hereunder, be less
than the rent payable during that month by Tenant hereunder, then Tenant shall
pay such deficiency to Landlord. Such deficiency shall be calculated and paid
monthly. Tenant shall also pay to Landlord, as soon as ascertained, any costs
and expenses incurred by Landlord in such reletting, including but not limited
to brokerage commissions, or in making alterations and repairs not covered by
the rentals received from such reletting. No reentry or taking possession of the
Premises by Landlord pursuant to this Section 19, shall be construed as an
election to terminate this Lease unless a written notice of such intention be
given by Landlord to Tenant or unless the termination thereof be decreed by a
court of competent jurisdiction. Landlord may at any time after such reletting
elect to terminate this Lease for any such default by Tenant.

             (c) If Tenant fails to perform any covenant or condition to be
performed by Tenant, Landlord may, but without obligation to do so, perform such
covenant or condition at its option, after notice to Tenant. All costs incurred
by Landlord in so performing shall immediately be reimbursed to Landlord by
Tenant, together with interest at the Interest Rate computed from the due date.
Any performance by Landlord of Tenant's obligations shall not waive or cure such
default. Landlord may perform Tenant's defaulted obligations at Tenant's sole
cost and expense without notice in the case of any emergency. All costs and
expenses incurred by Landlord, including reasonable attorneys' fees (whether or
not legal proceedings are instituted), in collecting rent or enforcing the
obligations of Tenant under the Lease shall be paid by Tenant to Landlord upon
demand. Tenant's obligations pursuant to this Section 19 (c) shall survive the
expiration or earlier termination of this Lease.

             (d) Tenant hereby waives, for itself and all persons claiming by
and under Tenant, all rights and privileges which it might have under any
present or future Laws to redeem the Premises or reinstate or to continue the
Lease after being dispossessed or ejected from the Premises. All rights, options
and remedies of Landlord contained in this Lease shall be construed and held to
be cumulative, and no one of them shall be exclusive of the other,

                                       20
<PAGE>   24

and Landlord shall have the right to pursue any one or all of such remedies or
any other remedy or relief which may be provided by law, whether or not stated
in this Lease.

             (e) In addition to the remedies described in Sections 19(a)-(d)
above, Landlord shall be entitled to recover from Tenant under this Lease all
amounts necessary to compensate Landlord for all the detriment proximately
caused by any breach or default described in Section 18(g) above. The remedy
provided for in this Section 19(e) shall be in addition to any and all remedies
available in the other lease or agreement to which such breach or default
pertains.

        20. Landlord's Default and Tenant's Remedies. Landlord shall not be in
default hereunder unless Landlord fails to perform the obligations required of
Landlord within a reasonable time, but in no event later than thirty (30) days
after written notice by Tenant to Landlord specifying wherein Landlord has
failed to perform such obligation provided, however, that if the nature of
Landlord's obligation is such that more than thirty (30) days are required for
performance, then Landlord shall not be in default if Landlord commences
performance within such 30 day period and thereafter diligently prosecutes the
same to completion. In no event shall Tenant have the right to terminate this
Lease or withhold rent as a result of Landlord's default and Tenant's remedies
shall be limited to an action for damages, injunction or specific performance of
this Lease. Notwithstanding anything contained in this Lease to the contrary,
Tenant and all successors and assigns covenant and agree that, in the event of
any actual or alleged failure, breach or default hereunder by Landlord, their
sole and exclusive remedy shall be against Landlord's interest in the Project.
Tenant and all such successors and assigns agree that the obligations of
Landlord under this Lease do not constitute personal obligations of the
individual partners, whether general or limited, members, directors, officers or
shareholders of Landlord, and Tenant shall not seek recourse against the
individual partners, directors, officers or shareholders of Landlord or any of
their personal assets for satisfaction of any liability with respect to this
Lease.

        21. Attorneys' Fees. In the event of any dispute between Landlord or
Tenant, whether or not suit is filed, or if either Landlord or Tenant shall
institute any action or proceeding against the other party relating to this
Lease, the non-prevailing party in such action or proceeding shall reimburse the
prevailing party for its disbursements incurred in connection therewith and for
its reasonable attorneys' fees, whether or not such action or proceeding is
pursued to judgment. In addition to the foregoing award of attorneys' fees to
the prevailing party, the prevailing party in any action or proceeding on this
Lease shall be entitled to its reasonable attorneys' fees incurred in any
post-judgment proceedings to collect or enforce any such judgment. This
provision is separate and several and shall survive (i) the expiration or
earlier termination of this Lease and (ii) the merger of this Lease into any
judgment on this Lease.

        22. Eminent Domain. If all or any part of the Premises shall be taken as
a result of the exercise of the power of eminent domain or sale in lieu of such
taking (collectively, any "Taking"), this Lease shall terminate as to the part
so taken as of the date of Taking, and, in the case of a partial Taking, either
Landlord or Tenant shall have the right to terminate this Lease as to the
balance of the Premises by notice to the other within thirty (30) days after
such date, provided, however, that a condition to the exercise by Tenant of such
right to terminate shall be that the portion of the Premises taken shall be of
such extent and nature as substantially to handicap, impede or impair Tenant's
use of the balance of the Premises. In the event of the Taking of a material
portion of the Project (whether or not the Premises is affected thereby),
Landlord shall have the right to terminate this Lease by notice to Tenant within
30 days following such Taking. In the event of any Taking, Landlord shall be
entitled to any and all compensation, damages, income, rent, awards, or any
interest therein whatsoever which may be paid or made in connection therewith,
and Tenant shall have no claim against Landlord for the value of any unexpired
Term of this Lease or otherwise. Notwithstanding the foregoing, Tenant may apply
to the condemning party for a separate award for Tenant's relocation costs and
loss of good will, unless such award diminishes the award otherwise payable to
Landlord, in which case Tenant shall be precluded from making such an
application. In the event of a partial Taking of the Premises which does not
result in a termination of this

                                       21
<PAGE>   25
Lease, the monthly rental thereafter to be paid shall be equitably reduced. The
parties agree that their respective rights and obligations in the event of any
Taking shall be governed by the terms of this Lease and hereby waive any and all
rights under Section 1265.130 of the California Code of Civil Procedure.

        23. Subordination.

             (a) This Lease and Tenant's rights hereunder shall be subject and
subordinate to any ground lease, mortgage, deed of trust, or other hypothecation
or security device (collectively, any "Mortgage"), now or hereafter placed by
Landlord upon the Project, Building or other real property of which the Premises
is a part, to any and all advances made on the security thereof, and to all
renewals, modifications, consolidations, replacements and extensions thereof.
Tenant agrees that the ground lessors, mortgagees, trust deed beneficiaries and
other lienholders under any such Mortgages (collectively, "Mortgagees") shall
have no duty, liability or obligation to perform any of the obligations of
Landlord under this Lease, but that in the event of Landlord's default with
respect to any such obligation, Tenant will give any Mortgagee whose name and
address have been furnished Tenant in writing for such purpose notice of
Landlord's default and allow such Mortgagee thirty (30) days (or if more than
thirty (30) days is required to effect such cure, such additional time as may be
necessary) following receipt of such notice for the cure of said default before
invoking any remedies Tenant may have by reason thereof. If any Mortgagee shall
elect to have this Lease and/or Tenant's rights hereunder superior to the lien
of its Mortgage and shall give written notice thereof to Tenant, this Lease and
such rights shall be deemed prior to such Mortgage, notwithstanding the relative
dates of the documentation or recordation thereof

             (b) Notwithstanding any such subordination, and at the election of
a Mortgagee or any other party who acquires ownership of the Premises by reason
of the exercise of rights under a Mortgage or through a deed in lieu of
foreclosure, Tenant agrees to attorn to such Mortgagee or other party, and in
the event of such exercise of remedies and such election, such new owner shall
not: (i) be liable for any act or omission of any prior landlord or with respect
to events occurring prior to acquisition of ownership, (ii) be subject to any
offsets or defenses which Tenant might have against any prior landlord, (iii) be
bound by prepayment of more than one month's rent, or (iv) be required to
perform any obligations of any prior landlord under the Lease.

             (c) The agreements contained in this Section 23 shall be effective
without the execution of any further documents and shall survive the exercise of
remedies under a Mortgage provided, however, that, upon written request from
Landlord or a Mortgagee, Tenant and Landlord shall execute such further writings
as may be reasonably required to separately document any of the matters provided
for herein.

             (d) Notwithstanding Sections 23(a) and (b) above, Tenant's
obligation to subordinate this Lease to any Mortgage(s) entered into after the
date of this Lease shall be subject to Tenant's receiving assurance (a
"Non-Disturbance Agreement") from the Mortgagee that Tenant's possession and
this Lease shall not be disturbed as long as (i) no default by Tenant (or event
which would constitute a default with the passage of time or the giving of
notice) has occurred and (ii) Tenant attorns to said Mortgagee as provided
above. Landlord shall also use its best efforts to obtain a Non-Disturbance
Agreement from the Mortgagee, if any, holding a Mortgage against the Project as
of the date of this Lease; provided, however, that Tenant shall pay all costs
and expenses, including, without limitation, attorneys' fees, incurred by
Landlord in connection with such efforts. The form and content of any
Non-Disturbance Agreement required under this Section 23(d) shall be determined
by the Mortgagee, in its sole and absolute discretion; provided, that, with
respect to Mortgages entered into after the date of this Lease, Landlord shall
use reasonable efforts (without expending money or incurring any obligation) to
assist Tenant in causing the Mortgagee thereunder to use a commercially
reasonable form of Non-Disturbance Agreement.

        24. Sale. In the event the original Landlord hereunder, or any successor
owner of the Project, shall sell or convey the Project, all liabilities and
obligations on the part of the original Landlord, or such successor owner, under
this Lease accruing thereafter shall terminate, and

                                       22
<PAGE>   26

thereupon all such liabilities and obligations shall be binding upon the new
owner. Tenant agrees to attorn to such new owner.

        25. Estoppel Certificate. At any time and from time to time, but in no
event later than ten (10) business days after request by Landlord, Tenant shall
execute, acknowledge, and deliver to Landlord, promptly upon request, a
certificate certifying (a) that this Lease is unmodified and in full force and
effect (or, if there have been modifications, that this Lease is in full force
and effect, as modified, and stating the date and nature of the modification),
(b) the amount of the Base Rent and most recent Escalation Rent, if any, and the
date to which such rental has been paid, (c) that no notice has been received by
Tenant of any default which has not been cured, except as to defaults specified
in the certificate, (d) that no default of Landlord is claimed by Tenant, except
as to defaults specified in the certificate, and (e) such other matters as may
be reasonably requested by Landlord. Any such certificate may be relied upon by
any prospective purchaser or existing or prospective Mortgagee under any
Mortgage on the project or Building. Tenant's failure to deliver such statement
within such time shall constitute a default by Tenant under this Lease and shall
be conclusive upon Tenant (i) that this Lease is in full force and effect,
without modification except as may be represented by Landlord, (ii) that not
more than one (1) monthly installment of Base Rent and Escalation Rent in the
amount specified by Landlord has been paid in advance, and (iii) that there are
no uncured defaults in Landlord's performance. Within ten (10) days following
Landlord's request from time to time during the Term, Tenant shall deliver to
Landlord Tenant's current financial statement and financial statements for the
two (2) years prior to the current financial statement year, prepared in
accordance with generally accepted accounting principles, consistently applied.
Landlord shall use reasonable efforts not to divulge any confidential financial
information of Tenant contained in an estoppel certificate to any third parties
(other than Landlord's officers, directors, employees, accountants, attorneys
and others as reasonably required in the conduct of Landlord's business, or as
otherwise required by applicable securities Laws); except in the case of any
litigation concerning this Lease, in which event Landlord shall use reasonable
efforts to keep such financial terms confidential.

        26. Project Planning. In the event Landlord requires the Premises for
use in conjunction with another suite or for other reasons connected with
Project planning, upon notifying Tenant in writing, Landlord may, subject to
Tenant's approval as provided below, move Tenant to other premises in the
Corporate Center (the "New Premises"), at Landlord's sole cost and expense, and
the terms and conditions of this Lease shall remain in full force and effect,
except that a revised Exhibit "B" shall become part of this Lease and shall
reflect the location of the New Premises and Section 1 of this Lease shall be
amended to include and state all correct data as to the New Premises (except
that Tenant's rental obligations under this Lease shall not be increased as a
result of such relocation to the New Premises). Landlord shall provide Tenant
with at least thirty (30) days' prior written notice of its desire to relocate
the Premises, which notice shall describe in reasonable detail the location and
configuration of the proposed New Premises. Tenant shall approve or disapprove
the proposed New Premises within ten (10) days of the date of Landlord's notice,
which approval shall not be unreasonably withheld and shall be deemed granted if
not withheld, in writing, within such ten (10) day period; provided, however,
that Tenant may not withhold its approval of the New Premises if the size,
quality, configuration and window lines of the proposed New Premises are
substantially similar to the original Premises.

        27. No Light, Air, or View Easement. Any diminution or shutting off of
light, air or view by any structure which may be erected on lands adjacent to
the Building shall in no way affect this Lease or impose any liability on
Landlord.

        28. Holding Over. If Tenant holds possession of the Premises after
expiration of the Term of this Lease or any termination of this Lease, Tenant
shall become a tenant at sufferance only, at a monthly rental equivalent to 150%
of the then prevailing monthly rental paid by Tenant at the expiration of the
Term or termination of this Lease, payable in advance on or before the first day
of each month, and otherwise subject to the terms, covenants and conditions
herein specified, so far as applicable. Acceptance by Landlord of rent after
such expiration or earlier termination shall not result in a

                                       23
<PAGE>   27

renewal or extension of this Lease. If Tenant fails to surrender the Premises
upon the expiration of this Lease despite demand to do so by Landlord, Tenant
shall indemnify, defend and hold harmless Landlord from and against any and all
claims, demands, losses, liabilities, damages, costs and/or expenses (including,
without limitation, reasonable attorneys, fees and expenses) arising out of such
failure to surrender including, without limitation, any claim made by any
succeeding tenant.

        29. Security Deposit. Concurrently with its execution of this Lease,
Tenant shall deposit with Landlord the sum specified in the Basic Lease
Information (the "Security Deposit"). The Security Deposit shall be held by
Landlord as security for the faithful performance by Tenant of all the
provisions of this Lease to be performed or observed by Tenant. If Tenant fails
to pay rent or other sums due hereunder, or otherwise defaults with respect to
any provision of this Lease, Landlord may use, apply or retain all or any
portion of the Security Deposit for the payment of any rent or other sum in
default or for the payment of any other sum to which Landlord may become
obligated by reason of Tenant's default, or to compensate Landlord for any loss
or damage which Landlord may suffer thereby. If Landlord so uses or applies all
or any portion of the Security Deposit, Tenant shall within ten (10) days after
demand therefor deposit cash with Landlord in an amount sufficient to restore
the Security Deposit to the full amount thereof and Tenant's failure to do so
shall be a material breach of this Lease. Landlord shall not be required to keep
the Security Deposit separate from its general accounts. If Tenant performs all
of Tenant's obligations hereunder, the Security Deposit, or so much thereof as
has not theretofore been applied by Landlord, shall be returned, without
interest, to Tenant (or, at Landlord's option, to the last assignee, if any, of
Tenant's interest hereunder) at the expiration of the Term hereof, and after
Tenant has vacated the Premises. No trust relationship is created herein between
Landlord and Tenant with respect to the Security Deposit. If this Lease provides
for periodic increases in Base Rent, Lessee shall, within ten (10) days after
demand by Landlord, increase the amount of the Security Deposit to equal the
Base Rent then in effect.

        30. Waiver. The waiver by Landlord of any agreement, condition or
provision herein contained shall not be deemed to be a waiver of any subsequent
breach of the same or any other agreement, condition or provision herein
contained, nor shall any custom or practice which may grow up between the
parties in the administration of the terms hereof be construed to waive or to
lessen the right of Landlord to insist upon the performance by Tenant in strict
accordance with such terms. The subsequent acceptance of rental hereunder by
Landlord shall not be deemed to be a waiver of any preceding breach by Tenant of
any agreement, condition or provision of this Lease, other than the failure of
Tenant to pay the particular rental so accepted, regardless of Landlord's
knowledge of the preceding breach at the time of acceptance of the rental.

        31. Notices and Consents; Confidentiality. (a) All notices, consents,
demands and other communications from one party to the other that are given
pursuant to the terms of this Lease shall be in writing and shall be deemed to
have been fully given two (2) full business days following deposit in the United
States mail, certified or registered, postage prepaid, or one (1) business day
following transmittal by reputable overnight courier (such as Federal Express),
or when hand delivered, to the respective addresses for delivery of notices
specified in the Basic Lease Information, or to such other place as either party
may from time to time designate in a notice to the other party. Notwithstanding
the foregoing, Tenant hereby appoints as its agent to receive the service of all
dispossessory or distraint proceedings and notices thereunder the person in
charge of or occupying the Premises at the time, and, if no person shall be in
charge of or occupying the same, then such service may be made by attaching the
same on the main entrance of the Premises. Failure to deliver a copy of any
notice as provided in the Basic Lease Information shall not invalidate any
notice or extend the time for performance if the notice is given to the primary
recipient listed in the Basic Lease Information.

             (b) Tenant shall not divulge the terms and provisions of this Lease
to any third parties (other than Tenant's officers, directors, employees,
accountants, and attorneys as required in the conduct of Tenant's business, or
as otherwise required by applicable securities Laws); except in

                                       24
<PAGE>   28

the case of any litigation concerning this Lease, in which event Tenant shall
use its best efforts to keep such terms and provisions confidential. Except as
otherwise set forth in this Section 31(b), Tenant's disclosure of such
information to any other person shall constitute a material breach of this
Lease.

        32. Complete Agreement. There are no oral agreements between Landlord
and Tenant affecting this Lease, and this Lease supersedes and cancels any and
all previous negotiations, arrangements, brochures, agreements, and
understandings if any, between Landlord and Tenant or displayed by Landlord to
Tenant with respect to the subject matter of this Lease or the Project. There
are no representations between Landlord and Tenant other than those contained in
this Lease. All implied warranties, including implied warranties of
merchantability and fitness, are excluded.

        33. Authority. If Tenant signs as a corporation, each of the persons
executing this Lease on behalf of Tenant warrants that Tenant is a duly
authorized and existing corporation, that Tenant has and is qualified to do
business in California, that the corporation has the full right and authority to
enter into this Lease, and that each and both of the persons signing on behalf
of the corporation were authorized to do so. If Tenant signs as a partnership,
each of the persons executing this Lease on behalf of Tenant warrants that
Tenant is a partnership, that the partnership has the full right and authority
to enter into this Lease, and that each person signing on behalf of the
partnership is authorized to do so. If Tenant signs as a limited liability
company, trust, or some other entity, each of the persons executing this Lease
on behalf of Tenant warrants that Tenant is the type of entity stated, that the
entity has the full right and authority to enter into this Lease, and that each
person signing on behalf of said entity is authorized to do so.

        34. Brokers. Landlord shall be responsible for the payment of any
commissions owing in connection with this Lease to the brokers specified in the
Basic Lease Information, if any (collectively, "Broker"), pursuant to separate
agreement. Landlord and Tenant each represent and warrant that it has had no
dealings with any real estate broker or agent in connection with the negotiation
of this Lease, other than the Broker, and that it knows of no other real estate
broker, agent or finder who is or might be entitled to a commission or fee in
connection with this Lease. If either party has dealt with any other person or
real estate broker with respect to leasing or renting space in the Project other
than Broker, such party shall be solely responsible for the payment of any fees
due said person or firm, and shall indemnify, defend and hold harmless the other
party from and against any liabilities, damages or claims with respect thereto,
including attorneys' fees and costs.

        35. Parking. Tenant shall be entitled, without charge therefor, to the
use of the number of nonexclusive surface parking spaces indicated in the Basic
Lease Information in such portion of the Common Areas as may be provided by
Landlord from time to time for the purpose of parking motor vehicles; provided,
however, that Tenant's two (2) visitor parking spaces shall be located in close
proximity to the front entrance to Tenant's Premises. Monthly parking fees
payable for any additional parking spaces requested by Tenant shall be the
prevailing rates within the Project for such spaces, if any, and shall be
payable one month in advance prior to the first day of each calendar month.
Tenant acknowledges, however, that Landlord may provide or not provide any
additional parking spaces requested by Tenant in Landlord's sole and absolute
discretion. Landlord may assign any unreserved and unassigned parking spaces
and/or make all or a portion of such spaces preferred and/or reserved, if it
determines in its sole discretion that it is necessary for orderly and efficient
parking. Tenant shall not use any spaces which have been specifically assigned
by Landlord including, without limitation, spaces assigned for uses such as
visitor parking or which have been designated by governmental entities with
competent jurisdiction as being restricted to certain uses. The use by Tenant
and its employees, visitors and invitees of the parking facilities of the
Project shall be on the terms and conditions set forth herein as well as on the
parking rules and regulations as established and modified by Landlord from time
to time. Landlord shall not be responsible to Tenant for the violation or
non-performance by any other tenant or occupant of the Project of any of such
parking rules and regulations. Tenant shall not permit or allow any vehicles
that belong to or are controlled by Tenant or Tenant's employees, suppliers,
shippers, customers or invitees to

                                       25
<PAGE>   29

be loaded, unloaded or parked in areas other than those designated by Landlord
for such activities. Notwithstanding the foregoing, Landlord shall have the
right to designate specific parking areas or parking stalls within the Project
for guest parking and for Tenant's parking spaces in excess of 3 parking spaces
per one thousand (1,000) square feet of Useable Area.

        36. Force Majeure. The time for performance by either party of any
obligation under this Lease (other than the payment of rent or other monetary
obligations) shall be extended for the period of delay resulting from fire,
earthquake, explosion, flood, the elements, acts of God or the public enemy,
strike, other labor trouble, interference of governmental authorities or agents,
or shortages of fuel, supplies or labor resulting therefrom or any other cause,
whether similar or dissimilar to the above, beyond the reasonable control of the
party obligated for such performance, financial inability excepted
(collectively, any "Force Majeure Event").

        37. Waiver of Trial by Jury. Landlord and Tenant hereby waive trial by
jury in any action, proceeding or counterclaim brought by either of the parties
hereto against the other or any matter whatsoever arising out of or in any way
connected with this Lease, the relationship of Landlord and Tenant, Tenant's use
or occupancy of the Premises, or any claim of injury or damage, or the
enforcement of any remedy under any statute, or otherwise.

        38. Intentionally Omitted.

        39. Recapture. Any agreement by Landlord contained herein for free or
abated rent or other charges applicable to the Premises, or for the giving or
paying by Landlord to or for Tenant of any cash or other bonus, inducement or
consideration for Tenant's entering into the Lease, all of which concessions are
hereinafter referred to as "Inducement Provisions," shall be deemed conditioned
upon Tenant's full and faithful performance of all of the terms, covenants and
conditions to be performed by Tenant under this Lease. Upon the occurrence of a
breach or default of this Lease by Tenant, or upon the filing by or against
Tenant of any petition under the United States Bankruptcy Code (Title 11 U.S.C.)
or any similar statute or law for the reorganization or liquidation of debt, or
upon any voluntary or involuntary assignment by Tenant for the benefit of its
creditors, (i) any such Inducement Provision shall automatically be deemed
deleted and of no further force or effect, and any rent, other charge, bonus,
inducement or consideration theretofore abated, given or paid by Landlord under
such Inducement Provision shall be immediately due and payable by Tenant to
Landlord, and shall be recoverable as additional rent due under the Lease,
notwithstanding any subsequent cure of said default or breach by Tenant. The
acceptance by Landlord of rent or the cure of the default or breach which
initiated the operation of this paragraph shall not be deemed a waiver by
Landlord of the provisions of this paragraph unless specifically so stated in
writing by Landlord at the time of such acceptance.

        40. Signage. Tenant, at its cost and expense, may place signage
identifying Tenant's business name on (i) a non-exclusive monument sign to be
constructed by Tenant (or, at Landlord's option, by Landlord at Tenant's cost)
and (ii) the Building lobby directory and on the Premises main entry door. The
monument signage right granted hereunder shall automatically terminate if such
signage is not placed within one (1) year of the Commencement Date. All signage,
including, without limitation, the location, design, size, color, and type,
shall be subject to (i) Landlord's prior written consent, which shall not be
unreasonably withheld, (ii) Building signage standards, if any, and (iii) all
applicable Laws.

        41. Must Take Space. On the six (6) month anniversary of the
Commencement Date (the "Must Take Space Commencement Date"), the Premises leased
to Tenant shall be increased to include the approximately five thousand (5,000)
square feet of Rentable Area identified on Exhibit "B" as the "Must Take Space"
(the "Must Take Space"). Following the Must Take Space Commencement Date,
Tenant's use and occupancy of the Must Take Space shall be for a term
co-terminus with the Lease Term, and otherwise subject to all applicable terms
and conditions of this Lease; provided, however, that Landlord shall have no
obligation to improve the Must Take Space for Tenant. Landlord and Tenant shall
within thirty (30) days following the Must Take Space Commencement Date execute
an amendment to this Lease prepared by Landlord to reflect the addition to the
Premises of the Must Take Space. Tenant shall not be required to pay Base Rent
or Escalation Rent for the Must

                                       26
<PAGE>   30

Take Space until the Must Take Space Commencement Date or such earlier date on
which Tenant commences occupancy of any portion of the Must Take Space for the
purposes of doing business.

        42. Expansion Space. Provided that no default by Tenant (which shall
include any mater which would constitute a default either with the passage of
time or the giving of notice) has occurred prior to the time the "Expansion
Space Notice" (as such term is defined below) is received by Landlord or
thereafter until the date on which the "Tenant's Exercise Notice" (as such term
is defined below) is received by Landlord, Tenant shall have the ongoing option
for the lease of any leaseable space in the Building (the "Expansion Space") to
the extent the same becomes available for lease to Tenant (which for purposes
hereof shall mean that such space is not then occupied or subject to lease or
option or right for lease extension or premises expansion by any other tenant or
person) during the initial Term, exercisable as follows: If Tenant desires to
expand the Premises to include any Expansion Space, Tenant shall deliver at any
time during the initial Term deliver written notice thereof to Landlord (the
"Expansion Space Notice"). Promptly following receipt of the Expansion Space
Notice, Landlord shall deliver to Tenant written notice of any Expansion Space
which is available or will become available during the twelve (12) month period
following the date of Tenant's Expansion Space Notice, and Tenant shall have ten
(10) business days following the date of such notice from Landlord to elect by
written notice to Landlord (the "Tenant's Exercise Notice") to lease (commencing
immediately upon availability) all of any one (1) configuration of such
Expansion Space for a term co-terminus with the Lease Term and otherwise subject
to all applicable terms and conditions of this Lease; provided, however, that
Landlord shall have no obligation to improve the Expansion Space for Tenant. If
(i) Tenant does not deliver an Expansion Space Notice, or (ii) after delivery of
Tenant's Expansion Space Notice and receipt of notice of any available space
from Landlord, Tenant does not deliver Tenant's Exercise Notice within such ten
(10) business day period electing to lease such Expansion Space, Landlord may
proceed to lease such Expansion Space to any party upon any terms and conditions
as Landlord desires. If Tenant delivers the Expansion Space Notice, then (i) the
"Premises" shall thereafter be deemed for all purposes to include the Expansion
Space and (ii) Tenant's Base Rent, Percentage Share of Building Operating
Expenses, and Building Tax Expenses, Security Deposit, and other matters in this
Lease pertaining to the amount of Rentable Area contained within the Premises
shall be adjusted accordingly, as reasonably determined by Landlord. Landlord
and Tenant shall within thirty (30) days following Landlord's receipt of the
Tenant's Exercise Notice execute an amendment to this Lease prepared by Landlord
to reflect the addition to the Premises of the Expansion Space, and Landlord
may, but without obligation to do so, declare the Tenant's Exercise Notice to be
null and void if Tenant fails to execute such amendment. Notwithstanding
anything to the contrary contained in this paragraph, Tenant may not exercise
its rights under this Section 42 after the last day of the forty-second (42)
month of the initial Term unless it concurrently exercises its option to extend
the Term by the Option Term as provided in Section 2 above.

        43. Miscellaneous. The words "Landlord" and "Tenant" as used herein
shall include the plural as well as the singular. If there be more than one
Tenant, the obligations hereunder imposed upon Tenant shall be joint and
several. Time is of the essence of this Lease and each and all of its
provisions. Submission of this instrument for examination or signature by Tenant
does not constitute a reservation of or option for lease, and it is not
effective as a lease or otherwise until execution and delivery by both Landlord
and Tenant. The agreements, conditions and provisions herein contained shall,
subject to the provisions as to assignment, apply to and bind the heirs,
executors, administrators, successors and assigns of the parties hereto.
Notwithstanding the fact that certain references in this Lease to acts required
to be performed by Tenant hereunder, or to breaches or defaults of this Lease by
Tenant, omit to state that such acts shall be performed at Tenant's sole cost
and expense, or omit to state that such breaches or defaults by Tenant are
material, unless the context clearly implies to the contrary, each and every act
to be performed or obligations to be fulfilled by Tenant shall be performed at
Tenant's sole cost and expense, and all breaches or defaults by Tenant hereunder
shall be deemed material. Upon request by Landlord, Tenant agrees to modify this
Lease to meet the requirements of any or all lenders or ground lessors selected
by Landlord who request such modification as a condition precedent to providing
any loan or financing or to

                                       27
<PAGE>   31

entering into any ground lease affecting or encumbering the Project or any
portion thereof, provided that such modification does not (i) increase Base
Rent, (ii) alter the Term, or (iii) materially and adversely affect Tenants'
rights hereunder. Tenant shall not, without the consent of Landlord, use the
name of the Building or Project for any purpose other than as the address of the
business to be conducted by Tenant in the Premises. Any option, right or first
refusal, right of first negotiation/offer, or other similar right granted to
Tenant in this Lease (collectively, an "Option") is personal to the original
Tenant executing this Lease and cannot be voluntarily or involuntarily assigned
or exercised by any person or entity other than said Tenant (or Tenant's
affiliate under Section 15(g) above), and even then only when Tenant (or such
affiliate) is in full possession of the Premises and has no intention of
thereafter assigning or subletting. The Options, if any, herein granted to
Tenant are not assignable, either as part of an assignment of this Lease or
separately or apart therefrom, and no Option may be separated from this Lease in
any manner, by reservation or otherwise. If any provision of this Lease shall be
determined to be illegal or unenforceable, such determination shall not affect
any other provision of this Lease and all such other provisions shall remain in
full force and effect. This Lease shall be governed by and construed pursuant to
the laws of the State of California. Tenant shall not record this Lease nor a
short form memorandum hereof. Prior drafts of this Lease shall not be used in
interpreting the meaning of provisions contained in this Lease. The exhibits and
addendum, if any, specified in the Basic Lease Information are attached to this
Lease and by this reference made a part hereof. This Lease may be executed in
any number of counterparts, each of which shall be deemed to be an original, but
any number of which, taken together, shall constitute one and the same
instrument. Tenant acknowledges that this Lease is subject to Landlord's
receiving from its Mortgagee(s) approval of all of the terms contained herein.

        IN WITNESS WHEREOF, the parties have executed this Lease on the
respective dates indicated below:

LANDLORD:

MALIBU CANYON OFFICE PARTNERS, LLC,      TENANT:
a California limited liability company
                                         IXIA COMMUNICATIONS, INC., a
By:     MB REAL ESTATE, INC., a          California corporation
        California corporation
                                         By:   /s/ Errol Ginsberg
        By:   /s/ Calvin H. Johnston        ------------------------------------
        ------------------------------   Print Name: Errol Ginsberg
        Calvin H. Johnston, President
                                         Its:    President
                                             -----------------------------------

                                         By:     /s/ Joel Weissberger
                                            ------------------------------------

                                         Print Name: Joel Weissberger
                                                    ----------------------------

                                         Its:    Director of Hardware
                                             -----------------------------------

                                         Engineering (Assistant Secretary)
                                         ---------------------------------------

                                        If Tenant is a corporation, this
                                        instrument must be executed by the
                                        chairman of the board, the president or
                                        any vice president and the secretary,
                                        any assistant secretary, the chief
                                        financial officer or any assistant
                                        financial officer or any assistant
                                        treasurer of such corporation, unless
                                        the bylaws or a resolution of the board
                                        of directors shall otherwise provide, in
                                        which case the bylaws or a certified
                                        copy of the resolution, as the case may
                                        be, must be attached to this instrument.
                                        If Tenant is a limited liability
                                        company, this instrument must be
                                        executed by Tenant's manager, unless
                                        another person or entity is authorized
                                        pursuant to Tenant's Operating Agreement
                                        or a member's resolution, in which case
                                        a certified copy of the Operating
                                        Agreement or resolution, as the case may
                                        be, must be attached to this instrument.

                                       28

<PAGE>   32

                                  EXHIBIT "A"

                              SITE PLAN OF PROJECT

                    [GRAPHIC DEPICTION OF BUILDINGS AT SITE]

<PAGE>   33

                                  EXHIBIT "B"

                             FLOOR PLAN OF PREMISES

                 [GRAPHIC DEPICTION OF FLOOR PLAN OF PREMISES]
<PAGE>   34
                                   EXHIBIT "C"

                           IMPROVEMENT OF THE PREMISES

        1. Plans. Landlord and Tenant hereby approve the space plans and
Building standard specifications (collectively, the "Space Plans") for the
construction of certain improvements, WHICH SHALL NOT INCLUDE TENANT'S
TELEPHONE, COMPUTER, AND DATA SYSTEMS, FURNITURE, OR OTHER PERSONAL IMPROVEMENTS
DESIRED BY TENANT (the "Tenant Improvements") to be permanently affixed to the
Premises, which Space Plans are described on Schedule 1 attached hereto and
incorporated herein by this reference. Promptly following the execution of this
Lease, Landlord shall cause Landlord's architect to prepare final plans and
specifications (the "Final Plans") for the Tenant Improvements, in accordance
with the Space Plans. Such Final Plans shall be submitted by Landlord's
architect to Landlord and Tenant for approval, which approval shall not be
unreasonably withheld and shall be granted so long as such Final Plans are in
accordance with the approved Space Plans; provided, however, that any deviation
from the Space Plans requested by Tenant as a part of the Final Plans shall be
subject to the provisions of Section 3 of this Exhibit "C" respecting "Change
Orders" (as hereinafter defined). Upon written approval of the Final Plans by
the parties, Landlord shall be authorized to proceed with the construction of
the Tenant Improvements in accordance with the Final Plans. All Tenant
Improvements shall be constructed using then current Building standard materials
and colors.

        In the event of any conflict among this Exhibit "C", the Space Plans,
and any notes attached to the Space Plans, the notes attached to the Space Plans
shall prevail. For example, if the notes attached to the Space Plans provide
that the costs associated with a portion of the work described in said Space
Plans is to be paid for by Tenant, then Tenant shall be obligated to pay such
costs, notwithstanding the fact that this Exhibit "C" provides that Landlord
shall perform the Tenant Improvements (as shown in the Space Plans) at its cost
and expense.

        2. Construction of the Tenant Improvements. Subject to the provisions of
Section 3 below, Landlord shall construct, or cause the construction of, the
Tenant Improvements in accordance with the approved Final Plans, at Landlord's
sole cost and expense. In addition to Landlord's obligation to undertake the
Tenant Improvements described in Schedule 1 attached hereto, Landlord shall also
pay to Tenant four thousand dollars ($4,000.00) to reimburse Tenant for the
costs of its telephone, computer and data systems, furniture and other personal
improvements placed by Tenant in the Premises. Landlord shall make such payment
to Tenant within thirty (30) business days following the Commencement Date.

        3. Deviations from the Final Plans. Tenant shall be liable for the
increased cost of the design and construction of the Tenant Improvements
resulting from any Change Orders in accordance with the provisions of this
Section 3, plus a construction administration fee to The Johnston Group, an
affiliate of Landlord, in an amount equal to ten percent (10%) of such cost. In
the event of any deviation from the Space Plans requested by Tenant as a part of
the Final Plans pursuant to Section 1 above, and/or any change to any item of
Final Plans following the approval thereof by Landlord pursuant to Section 1
above, Tenant shall submit to Landlord a written request for a change order (the
"Change Order Request"), detailing the desired change. If Landlord approves
Tenant's Change Order Request, Landlord shall promptly thereafter issue to
Tenant a statement (the "Change Order Statement") indicating the net increase in
the cost of design and construction of the Tenant Improvements resulting from
the implementation of such Change Order Request (including, without limitation,
reasonable contractor's fees for profit, overhead and general conditions in
connection with such Change Order Request). Within 3 days following receipt of
such Change Order Statement from Landlord, Tenant shall notify Landlord in
writing whether Tenant elects to incorporate the Change Order Request into the
Final Plans, provided that it shall be a condition to the effectiveness of such
an election to so incorporate the Change Order Request that Tenant pay to
Landlord the amount specified on the Change Order Statement. If Tenant so elects
to incorporate the Change Order Request into the Final Plans, the Change Order
Request shall become a "Change Order" and Landlord may retain the amount
delivered by Tenant pursuant to the Change Order Statement therefor as Tenant's
contribution to the cost of such Change Order. If the adoption of a Change Order
causes a delay in the Commencement Date that would have otherwise been
established in the absence of such Change Order, such delay shall be a "Tenant
Delay" (as defined in Section 4(b) below). In addition, in the event that the
net cost of construction of the Tenant Improvements increases due to changes
requested by

                              EXHIBIT "C" - PAGE 1
<PAGE>   35

any applicable governmental authority in the Tenant Improvements as set forth in
the Final Plans approved by Landlord and Tenant pursuant to Section 1 above,
Tenant shall be pay to Landlord the amount of such increased costs within 10
days after Tenant's receipt from Landlord of written notice thereof.

        4. Commencement Date.

           (a) The "Commencement Date" shall mean the earlier of (i) November 1,
1999, (ii) the date on which Tenant takes possession of any portion of the
Premises for any purpose other than those permitted under Section 5(a) below,
and (iii) the date on which construction by Landlord of the Tenant Improvements
is SUBSTANTIALLY COMPLETED AND READY FOR OCCUPANCY. For purposes hereof,
"Substantial Completion" shall be deemed to occur on the date upon which the
Tenant Improvements have been substantially completed pursuant to the Final
Plans (as determined by Landlord's architect or space planner), with the
exception of any PUNCH LIST ITEMS AND TENANT'S CONTROLLED IMPROVEMENTS, IF ANY
(E.G., TENANT'S FIXTURES, TELEPHONES, DATA LINES, COMPUTERS, FURNITURE, ETC.) TO
BE INSTALLED BY TENANT AND/OR UNDER THE SUPERVISION OF LANDLORD'S CONTRACTOR.

           (b) If there shall be a delay or there are delays in the occurrence
of the Commencement Date as a direct, indirect, partial, or total result of any
of the following (in any such case, a "Tenant Delay"): (i) Tenant's failure to
timely perform its obligations under this Exhibit "C" or the other provisions of
this Lease requiring Tenant's approval, (ii) Tenant's request for any Change
Orders and/or the implementation thereof, (iii) Tenant's requirement for
materials, components, finishes or improvements which are not available in a
commercially reasonable time given the anticipated date of substantial
completion of the Premises, or which are different from Building standards, or
(iv) any other acts or omissions of Tenant, or its agents, employees and/or
contractors, then, notwithstanding anything to the contrary set forth in this
Lease (including, without limitation, this Exhibit "C") and regardless of the
actual date of the Commencement Date, the Commencement Date shall be the date on
which the Commencement Date would have occurred if no Tenant Delay or Tenant
Delays, as set forth above, had occurred. If Tenant Delays exist, then upon the
substantial completion of the Premises, Landlord shall notify Tenant of (1) the
aggregate period of the Tenant Delays and (2) the Commencement Date as
determined pursuant hereto. Tenant shall, within five (5) days following receipt
of such notice, perform or cause to be performed all obligations under this
Lease (including, without limitation, the payment of rent) that have accrued
from the Commencement Date as determined pursuant hereto, to the date on which
Tenant received Landlord's notice, and the Commencement Date shall, for all
purposes under this Lease, be the Commencement Date as determined pursuant
hereto. Nothing contained herein shall be deemed to relieve Landlord of its
obligation to use diligent efforts to complete the Tenant Improvements in a
timely manner subject to Tenant Delays and delays due to the occurrence of any
Force Majeure Events.

        5. Miscellaneous.

           (a) Provided that Tenant and its agents do not interfere with the
construction of the Tenant Improvements, upon reasonable prior written notice to
Landlord, Tenant shall be permitted access to the Premises not earlier than
thirty (30) days prior to the date on which Landlord anticipates that
substantial completion of the Tenant Improvements will occur for the purpose of
installing over-standard equipment or fixtures (including Tenant's data and
telephone equipment) in the Premises. Prior to any such entry upon the Premises,
Tenant shall deliver to Landlord evidence of the satisfaction of Tenant's
insurance obligations set forth in this Lease. Any such occupancy of the
Premises by Tenant prior to the Commencement Date shall be subject to all
applicable provisions of the Lease (including, without limitation, the indemnity
and insurance provisions of Lease Sections 12 and 13) other than the obligation
for the payment of Base Rent and Escalation Rent.

           (b) Tenant has designated Lance Buterbaugh as its sole representative
with respect to the matters set forth in this Exhibit "C", who, until further
notice to Landlord, shall have full authority and responsibility to act on
behalf of the Tenant as required in this Exhibit "C".

           (c) Landlord has designated Jeff Johnston as its sole representative
with respect to the matters set forth in this Exhibit "C", who, until further
notice to Tenant, shall have full authority and responsibility to act on behalf
of the Landlord as required in this Exhibit "C".

                              EXHIBIT "C" - PAGE 2
<PAGE>   36

           (d) At Landlord's option, all subcontractors, laborers, materialmen,
and suppliers retained directly by Tenant shall be union labor in compliance
with the master labor agreements existing between trade unions and the Southern
California Chapter of the Associated General Contractors of America.

           (e) All references herein to a number of days shall mean and refer to
calendar days. In all instances where Tenant is required to approve or deliver
an item, if no written notice of approval is given or the item is not delivered
within the stated time period, at Landlord's sole option, at the end of such
period the item shall automatically be deemed approved or delivered by Tenant
and the next succeeding time period shall commence.

                              EXHIBIT "C" - PAGE 3

<PAGE>   37

                                   SCHEDULE 1

Landlord retains the right to add floor areas to open area above tenant's lobby.
All furniture and card key access by tenant.

DEMOLITION

Demo existing walls as indicated.

Demo existing power and communication outlets as indicated.

Disconnect power to nearest j-box and remove all unused cable.

Remove all unused low voltage cable in ceiling.

Demo existing ceiling grid and as required to maintain a consistent overall new
look.

Demo existing gypsum board ceiling/soffit as required to create an overall
consistent new look.

Remove existing light fixtures as required and save for relocation.

Demo existing flooring and base throughout.

Demo existing wallcovering throughout.

Remove existing doors, frames and hardware indicated on plan; save for reuse.

CONSTRUCTION

F & I 1/4" copper line to refrigerator at lounge.

Patch and repair existing walls as required. Prep smooth for finish.

Scar patch at demo'd walls.  Prep smooth for finish.

Provide 4' x 8' fire retardant, paint grade plywood backboard with finished
edges, for tenants telephone equipment.

Top of backboard mounted at ceiling, bottom to be 28" aff. Min.

Paint to match adjacent wall.

Core drill for new floor outlets as shown.

F & I carpet borders or insets. $1,500 allowance.

Tenant to F & I movable partition between demo and conference room. Landlord to
pay cost to purchase building standard white board and vertical blinds. Tenant
contractor to install.

Paint all surfaces.  Eggshell finish (semi-gloss in lunchroom) u.o.n.

F & I building standard window treatment on perimeter glass as required.

Refinish existing doors (touch up).

Paint existing doorframes (touch up).

                                       1

<PAGE>   38

MILLWORK

F & I stain grade wood media cabinet in conference room with retractable doors
and pull out, swivel shelf.

F & I 34"h. Plastic laminate base cabinet with ada accessible sink cabinet.
Counter to step up to 36"h above dishwasher, back and one side splash. (lunch
room) Drawers in lower cabinets.

Fill existing holes in slab with fire rated material.

F & I new building standard doors, frames and hardware as required.

Relocate existing doors, frames and hardware. F & I new to match as required.

Reuse existing hardware on new doors and frames where possible.

F & I (clear, tempered) glass (no double glazing) with maximum spacing (as
reasonably determined by architect & contractor) between mullions at conference
room opposite demo room. (frames & glass) F & I glass in lobby wall ($1,200
allowance).

Use existing (88) dove grey mail slots (include 8 larger ones).

F & I 9 12"d laminate shelf w/reverse corbels & backsplash in copy/storage
behind reception.

Tenant to pay for cabinets at storage & server rooms as well as assistant's desk
outside Errol's office.

GC to install dishwasher, refrigerator and microwave supplied by tenant.

F & I bldg. Std. Garbage disposal and under-counter hot water heater.

F & I toilets.

F & I lavatory and faucets as indicated.

F & I paper towel dispenser/waste receptacle.

F & I toilet paper and seat cover dispenser with sanitary disposal.

F & I grab bars at 33" centerline, aff.

F & I mirrors above splash, length of counter.

Install new one hour corridor as indicated.

POWER AND COMMUNICATIONS

Provide two separate circuit quadruplex outlets (110v/20a) with isolated
grounds, for tenant's telephone and computer equipment.

Provide one quad. One duplex and one combo (phone/data), one phone outlet in
executive offices.

Provide two duplex and one combo (phone/data) outlet in all other offices.

Provide one quadruplex and one combo (phone/data) outlet in all open offices.

Provide 3/4" conduit stub-up 6" above ceiling for all communications outlets.

Re-use existing 3" home run conduit from building telephone closet to tenants
equipment.

                                       2

<PAGE>   39

F & I doorbell/buzzer at front and back door per plan.

Provide 12 additional duplexes throughout.

Install and provide power to tenant-provided projector. Provide 220 volts in
each lab area at racks.

Provide 20 additional separate circuit outlets (110v/20a) for copiers, file
server and lunchroom equipment.

Furnish and install flush floor outlet with quadruplex electrical and combo
(phone/data) outlet for main conference room.

Contractor to connect furniture panel whip to electrical. Furniture vendor to
provide whip.

Provide four feet of lead for buzzer release attach to underside of reception
desk after furniture installation.

Contractor to inspect and verify that the existing electrical panel(s) will
accommodate the electrical requirements per plan.

Budget to include additional panel (if required) at required size and all
associated costs.

Landlord to provide conduit only for all phone and data lines. 3 per 20 amp
circuit per each 3 cubes will be provided.

All electrical engineering to be design-build by contractor.

REFLECTED CEILING

Existing ceiling grid and tile to remain. Patch and repair grid. Relocate or
replace tiles as required to maintain a consistent overall look and meet code.
Replace damaged/missing ceiling tiles and locate all same color tiles in the
same space (or office) as required. Add new ceiling to match and align with
existing as required for consistent overall look.

F & I new building standard 2 x 4 fluorescent fixtures as required.

Relocate, repair or replace existing 2 x 4 fluorescent fixtures to maintain an
overall new look and meet current code.

F & I 16 new low voltage adjustable, recessed downlights in reception and
conference room. (install in center of tile, u.o.n.)

F & I new or relocate existing thermostats as required. Install close to door
openings; do not install in center of wall.

Provide alternate switching or sensors on fluorescent fixtures as required by
code.

Night lights to be on 24-hour circuit. Connect to building emergency back-up
system or f & i new fixture with battery back-up unit.

Exit signs to be connected to emergency back-up system or f & i new fixture with
battery unit.

F & I building standard exit signs as required.

Relocate existing exit signs as required.

Remove existing exit signs as required.

                                       3

<PAGE>   40

Rework existing sprinklers as required per new wall layout and current code.
Engineering to be design build by contractor.

F & I additional hvac zones if required.

Engineering and installation by building recommended sub-contractor.

FINISHES

Install building standard vct in labs, storage, utility and lunchrooms.

Building standard carpet (centerpoint) throughout where specified including
expansion area. Anti-static carpet in demo room.

Landlord will agree to F & I building standard carpet or vct (or a combination
of both) at a later date in expansion area on this floor.

                                       4

<PAGE>   41
                                   EXHIBIT "D"

                              RULES AND REGULATIONS

        1. The sidewalks, halls, passages, exits, entrances, shopping malls,
elevators, escalators and stairways of the Building shall not be obstructed by
Tenant or used by Tenant for any purpose other than for ingress to and egress
from the Premises. The halls, passages, exits, entrances, shopping malls,
elevators, escalators and stairways are not for the general public, and Landlord
shall in all cases retain the right to control and prevent access thereto of all
persons whose presence in the judgment of Landlord would be prejudicial to the
safety, character, reputation and interests of the Project and its tenants,
provided that nothing herein contained shall be construed to prevent such access
to persons with whom Tenant normally deals in the ordinary course of its
business, unless such persons are engaged in illegal activities. Neither Tenant
nor any employee or invitee of Tenant shall go upon the roof of the Building.

        2. No sign, placard, picture, name, advertisement or notice visible from
the exterior of Tenant's Premises shall be inscribed, painted, affixed or
otherwise displayed by Tenant on any part of the Building without the prior
written consent of Landlord in its sole and absolute discretion. Landlord will
adopt and furnish to tenants general guidelines relating to signs inside the
Building on the office floors. All approved signs or lettering on doors shall be
printed, painted, affixed or inscribed at the expense of Tenant by Landlord.
Material visible from outside the Building will not be permitted.

        3. The Premises shall not be used for the storage of merchandise held
for sale to the general public or for lodging. No cooking shall be done or
permitted by Tenant on the Premises, except that use by Tenant of food and
beverage vending machines and Underwriters' Laboratory approved microwave ovens
and equipment for brewing coffee, tea, hot chocolate and similar beverages shall
be permitted, provided that such use is in accordance with all applicable Laws.
No food or drink shall be permitted in the common areas of the Project without
the express approval of Landlord. Food or drink shall never be permitted in the
common areas of any building. Tenant shall be responsible for any damage to the
improvements in any building due to food or drink spillage. If the Premises or
any portion of the Project shall become infected with vermin as a result of
Tenant's violation of the foregoing, Tenant, at its sole cost and expense, shall
cause the same to be exterminated as may be required by contractors approved by
Landlord.

        4. Tenant shall not employ any person or persons other than Landlord's
janitorial service for the purpose of cleaning the Premises, unless otherwise
specifically approved by Landlord. No person or persons other than those
approved by Landlord shall be permitted to enter the Building for the purpose of
cleaning the same. Tenant shall not cause any unnecessary labor by reason of
carelessness or indifference in the preservation of good order and cleanliness.
Janitor service will not be furnished on nights when rooms are occupied after
9:30 P.M. unless, by prior arrangement with Landlord, service is extended to a
later hour for specifically designated rooms.

        5. Landlord will furnish Tenant free of charge two keys to each door
lock in its Premises. Landlord may make a reasonable charge for any additional
keys. Tenant shall not have any keys made. Tenant shall not alter any lock or
install a new or additional lock or any bolt on any door of its Premises without
the prior consent of Landlord. Tenant shall in each case furnish Landlord with a
key for any such lock. Tenant, upon the termination of its tenancy, shall
deliver to Landlord all keys to doors in the Building which shall have been
furnished to Tenant.

        6. The freight elevator shall be available for use by all tenants in the
Building, subject to such reasonable scheduling as Landlord in its discretion
shall deem appropriate. The persons employed to move such equipment in or out of
the Building must be acceptable to Landlord. Landlord shall have the right to
prescribe the weight, size and position of all equipment, materials, furniture
or other properly brought into the Building. Heavy objects shall, if considered
necessary by Landlord, stand on wood strips of such thickness as is necessary to
properly distribute the weight. Landlord will not be responsible for loss of or
damage to any such property from any cause, and all damage done

                              EXHIBIT "D" - PAGE 1
<PAGE>   42

to the Building by moving or maintaining such property shall be repaired at the
expense of Tenant.

        7. Tenant shall not use or keep in the Premises or the Building any
kerosene, gasoline or inflammable or combustible fluid or material other than
limited quantities thereof reasonably necessary for the operation or maintenance
of office equipment, or use any method of heating or air conditioning other than
that supplied by Landlord. Tenant shall not use or keep or permit to be used or
kept any foul, noxious or hazardous gas or substance in the Premises, or permit
or suffer the Premises to be occupied or used in a manner offensive or
objectionable to Landlord or other occupants of the Building by reason of noise,
odors, or vibrations, or interfere in any way with other tenants or those having
business therein. No pets shall be kept in the Premises.

        8. Landlord shall have the right, exercisable without notice and without
liability to any tenant, to change the name and street address of the Building
and/or Project.

        9. Landlord reserves the right to exclude from the Building and/or
Project between the hours of 6 P.M. and 7 A.M. and at all hours on Saturdays,
Sundays and legal holidays any person who does not present a proper access card
or other identification as a tenant or an employee of a tenant, or who does not
otherwise present proper authorization by a tenant for access to its premises.
Tenant shall be responsible for all persons for whom it authorizes access and
shall be liable to Landlord for all acts of such persons. Landlord shall in no
case be liable for damages for any error with regard to the admission to or
exclusion from the Building and/or Project of any person. In the case of
invasion, mob, riot, public excitement or other circumstances rendering such
action advisable in Landlord's opinion, Landlord reserves the right to prevent
access to the Building and/or Project during the continuance of the same by such
action as Landlord may deem appropriate.

        10. The directory of the Building will be provided for the display of
the name and location of Tenant, and Landlord reserves the right to exclude any
other names therefrom. Any additional name which Tenant desires to have added to
the directory shall be subject to Landlord's approval and may be subject to a
charge therefor.

        11. No curtains, draperies, blinds, shutters, shades, screens or other
coverings, hangings or decorations shall be attached to, hung or placed in, or
used in connection with any exterior window in the Building other than Building
standard window coverings.

        12. Messenger services and suppliers of bottled water, food, beverages,
and other products or services shall be subject to such reasonable regulations
as may be adopted by Landlord. Landlord may establish a central receiving
station in the Building for delivery and pick-up by all messenger services, and
may limit delivery and pick-up at Tenant's Premises to Building personnel.

        13. Tenant shall see that the doors of its Premises are closed and
locked and that all water faucets or apparatus, cooking facilities and office
equipment (excluding office equipment required to be operative at all times) are
shut off before Tenant or its employees leave the Premises at night, so as to
prevent waste or damage, and for any default or carelessness in this regard,
Tenant shall be responsible for any damage sustained by other tenants or
occupants of the Building or Landlord. If the Premises is located in whole or
part on a multipletenancy floor, Tenant shall keep the doors to its Premises and
Building corridors closed at all times except for ingress and egress.

        14. The toilets, urinals, wash bowls and other restroom facilities shall
not be used for any purpose other than that for which they were constructed, no
foreign substance of any kind whatsoever shall be thrown therein and the expense
of any breakage, stoppage or damage resulting from the violation of this rule
shall be borne by the tenant who, or whose employees or invitees, shall have
caused it.

        15. Tenant shall not sell, or permit the retail sale of newspapers,
magazines, periodicals, theater tickets or any other goods or merchandise to the
general public in or on the Premises, nor shall Tenant carry on, or permit

                              EXHIBIT "D" - PAGE 2
<PAGE>   43

or allow any employee or other person to carry on, the business of stenography,
typewriting or any similar business in or from the Premises for the service or
accommodation of occupants of any other portion of the Building, nor shall the
Premises be used for manufacturing of any kind, or any business or activity
other than that specifically provided for in the Lease.

        16. Tenant shall not install any antenna, loudspeaker, or other device
on the roof or exterior walls of the Building.

        17. In order to ensure more orderly and efficient parking at the
Project, Tenant shall within ten (10) days after request by Landlord deliver to
Landlord a written list of all of Tenant's full and part-time employees and
independent contractors, which list shall include the make, model, year, color
and license plate number of each such person's vehicle(s). In addition, if
Landlord determines that Tenant and its officers, directors, employees, and
agents are using more parking spaces than are allotted to Tenant under the Basic
Lease Information, Landlord may require Tenant, at Tenant's expense, to locate
off-site parking for such persons (to the extent they exceed Tenant's
allotment), and to implement an off-site parking plan reasonably acceptable to
Tenant, which plan shall if necessary include a shuttle service. No motorcycles
or motor scooters shall be parked or stored anywhere in the Project other than
in the designated areas therefor in the Common Areas of the Project, and no
bicycles may be parked or stored anywhere in the Building other than in
facilities provided therefor in the Common Areas of the Project.

        18. Neither Tenant nor its invitees shall use in any portion of the
Building, any hand trucks or other material handling equipment except those
equipped with rubber tires and side guards.

        19. Tenant shall store its refuse within its Premises. No material shall
be placed in the refuse boxes or receptacles if such material is of such nature
that it may not be disposed of in the ordinary and customary manner of removing
and disposing of refuse in the municipality having jurisdiction over the
Premises without being in violation of any law or ordinance governing such
disposal. All refuse disposal shall be made only through entryways and elevators
provided for such purposes and at such times as Landlord shall designate.

        20. Canvassing, peddling, soliciting, and distribution of handbills or
any other written materials in the Building are prohibited, and Tenant shall
cooperate to prevent the same.

        21. The requirements of Tenant will be attended to only upon application
by telephone or in person at the office of the Project. Employees of Landlord
shall not perform any work or do anything outside of their regular duties unless
under special instructions from Landlord.

        22. Smoking shall be prohibited within the building and shall be
permitted within the exterior areas of the Project only in locations designated
by Landlord.

        23. Landlord may waive any one or more of these Rules and Regulations
for the benefit of any particular tenant or tenants, but no such waiver by
Landlord shall be construed as a waiver of such Rules and Regulations in favor
of any other tenant or tenants, nor prevent Landlord from thereafter enforcing
any such Rules and Regulations against any or all of the tenants of the Project.

        24. These Rules and Regulations are in addition to, and shall not be
construed to in any way modify or amend, in whole or in part, the terms,
covenants, agreements and conditions of the Lease.

        25. Landlord reserves the right to make such other and reasonable rules
and regulations as in its judgment may from time to time be needed for the
safety, care and cleanliness of the Project and/or Building, and for the
preservation of good order therein.

                              EXHIBIT "D" - PAGE 3
<PAGE>   44

                                   EXHIBIT "F"

                                FURNITURE SYSTEMS

                                   EXHIBIT "F"
<PAGE>   45
                         FIRST AMENDMENT TO OFFICE LEASE

        THIS FIRST AMENDMENT TO OFFICE LEASE ("Amendment") is entered as of
March 22, 2000 by and between Malibu Canyon Office Partners, LLC, a California
limited liability company ("Landlord"), and Ixia, a California corporation
(formerly known as Ixia Communications, Inc., a California corporation)
("Tenant"), with reference to the following facts:

                                 R E C I T A L S

A.      Landlord and Tenant previously entered into that certain Office Lease
        dated November 5, 1999 (the "Lease") pursuant to which Tenant leased
        from Landlord certain Premises comprising a portion of the Building
        commonly known as 26601 W. Agoura Road, Calabasas, CA 91302 (the
        "Premises");

B.      Tenant desires to expand the Premises to include the entirety of the
        aforementioned Building, and Landlord is willing to lease such
        additional space to Tenant subject to and as provided for in this
        Amendment; and

C.      Landlord and Tenant desire to modify the Lease as provided in this
        Amendment,

        NOW THEREFORE, in consideration of the mutual covenants and agreements
contained herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Landlord and Tenant agree as
follows:

                                A G R E E M E N T

4.      Expansion Premises. From and after the "Expansion Premises Commencement
        Date" (as defined in Section 2 below), the Premises leased to Tenant
        pursuant to the Lease shall for all purposes be deemed to include that
        certain space (the "Expansion Premises") located on the third (3rd)
        floor of the Building, as more particularly described in Exhibit "A"
        attached hereto and incorporated by this reference herein. The Expansion
        Premises is agreed by the parties to contain twenty thousand square feet
        of Rentable Area. The entire Premises (after giving effect to the
        Expansion Premises and the initial "Must Take Space" under Section 41 of
        the Lease) is agreed by the parties to contain forty-five thousand
        (45,000) square feet of Rentable Area in the Building. With the
        exception of the Tenant Improvements provided for in Section 6 below,
        the Expansion Premises shall be leased on an entirely "AS IS" basis,
        Tenant hereby agreeing that Tenant has thoroughly inspected the
        Expansion Premises and is completely satisfied with the condition of the
        same. Therefore, except as specifically provided in Section 6 below,
        Tenant shall accept the Expansion Premises without Landlord having any
        obligation for the improvement or alteration thereof.

5.      Expansion Premises Commencement Date. The term of Tenant's lease of the
        Expansion Premises under the Lease shall commence on June 1, 2000 (the
        "Expansion Space Commencement Date"), and shall be for a term
        co-terminus with the Lease Term (after giving effect to the extension
        under Section 9 below)).

6.      Base Rent; Percentage Share. Commencing upon the Expansion Premises
        Commencement Date, (i) the Base Rent payable by Tenant for the entire
        Premises (ie the original Premises, the initial Must Take Space and the
        Expansion Premises) shall be one and 50/100 dollars ($1.50) per month
        for each square foot of Rentable Area contained in the Premises and (ii)
        Tenant's Percentage Share of Building Operating Expenses and Building
        Tax Expenses shall be one hundred percent (100%). Tenant's Percentage
        Share

                                       1
<PAGE>   46

        of Operating Expenses attributable to any restaurant, fitness center or
        similar amenities shall continue to be calculated as provided in Section
        1(j) of the Lease.

7.      Security Deposit. Concurrently with its execution of this Amendment,
        Tenant shall deposit an additional Security Deposit with Landlord in the
        amount of two hundred twenty-five thousand dollars ($225,000.00) (the
        "Additional Security Deposit"), which amount equals three (3) months"
        Base Rent for the entire Premises (including all Must Take Space). That
        portion, if any, of the Additional Security Deposit which has not been
        applied by Landlord in accordance with the Lease shall earn interest at
        the rate of six percent (6%) per annum; provided, however, that upon any
        default by Tenant (including any matter which would constitute a default
        either with the passage of time or the giving of notice), (i) such
        interest shall immediately cease to accrue and (ii) any interest
        previously earned shall automatically be forfeited by Tenant (ie deemed
        not to have accrued). Landlord will refund the Additional Security
        Deposit, together with accrued interest thereon, if any, (to the extent
        not previously applied by Landlord in accordance with the Lease) to
        Tenant upon the completion of an initial public offering of Tenant's
        stock on either the New York Stock Exchange or the National Association
        of Securities Dealers Exchange if, and only if, such initial public
        offering generates immediately available cash to Tenant of forty million
        dollars ($40,000,000.00) or more (excluding debt or debt instruments);
        provided, that Landlord shall have no obligation to refund any portion
        of the Additional Security Deposit if a default (including any matter
        which would constitute a default either with the passage of time or the
        giving of notice) by Tenant has occurred. If Landlord is entitled to
        apply any portion of Tenant's Security Deposit under the Lease, Landlord
        may apply Tenant's Additional Security Deposit before applying the
        original Security Deposit previously made by Tenant. Except for
        Landlord's obligation, if any, to pay interest on and to otherwise
        refund the Additional Security Deposit as provided in this Amendment,
        the Additional Security Deposit shall be governed by the provisions of
        Section 29 of the Lease.

8.      Parking. Commencing upon the Expansion Premises Commencement Date and in
        addition to any parking allocated to Tenant in Section 35 of the
        original Lease, Tenant shall be entitled, at no additional cost to
        Tenant, to three point eight (3.8) non-exclusive surface parking spaces
        for each one thousand square feet of Usable Area located within the
        Expansion Premises, plus two (2) additional subterranean parking spaces
        located in such areas of the Building as Landlord may from time to time
        designate. Subject to availability, as from time to time determined by
        Landlord in its sole and absolute discretion, Tenant may also lease (i)
        fifteen reserved subterranean parking spaces, at a rate of sixty-five
        dollars ($65.00) per month per space, to be located in such areas of the
        Building as Landlord may from time to time designate, and (ii) nineteen
        (19) non-exclusive surface parking spaces, at no additional charge to
        Tenant, to be located in the northwest corner of the Project, as more
        particularly shown in Exhibit "B" attached hereto and incorporated by
        this reference herein. Any parking space described in clause (ii) of the
        preceding sentence which is not used by Tenant during normal business
        hours shall, at Landlord's option after one (1) business day's notice to
        Tenant, be forfeited by Tenant. In addition to the monthly parking fees,
        if any, provided for in the Lease, Tenant shall also pay to Landlord the
        following sums for each subterranean parking card provided to Tenant:
        (i) a ten dollar ($10.00) security deposit and (ii) a fifteen dollar
        ($15.00) non-refundable programming fee, in each case on a per card
        basis. Landlord shall refund the aforementioned per card security
        deposit to Tenant (or, at Landlord's option, to the last assignee, if
        any, of Tenant's interest hereunder) for each card that Tenant returns
        to Landlord (in good working condition) at the expiration of the Term
        hereof; provided that (i) Tenant must have vacated the Premises and (ii)
        Landlord may retain said security deposit to the extent that the
        Security Deposit received by Landlord under the Lease is not sufficient
        to pay any rent or other sums owing to Landlord under this Lease. Tenant
        shall deliver the aforementioned security deposit and programming fee to
        Landlord

                                       2
<PAGE>   47

        concurrently with its request for subterranean parking, unless this
        Lease initially provides for subterranean parking, in which case Tenant
        shall deliver such sums concurrently with its execution of this Lease.
        Except as expressly provided in this Section 5 to the contrary, any
        parking spaces allocated to Tenant under this Amendment shall be subject
        to the terms and provisions of Section 35 of the Lease.

9.      Tenant Improvements. Landlord, at Tenant's sole cost and expense but
        subject to the "Landlord's Contribution" (as such term is defined
        below), shall improve the Expansion Premises, the "Second Must Take
        Space" (as defined in Section 10 below) and the interior non-structural
        portions of the Building not previously occupied by Tenant consistent
        with space plans and working drawings to be prepared by Tenant and
        approved by Landlord in accordance with Section 8 of the Lease (said
        improvements are hereinafter referred to as the "Tenant Improvements").
        Landlord shall have the right to reasonably approve or disapprove
        Tenant's space planner and/or architect. Tenant shall also pay The
        Johnston Group, an affiliate of Landlord, a construction administration
        fee in an amount equal to ten percent (10%) of the total costs of design
        and construction of the Tenant Improvements. Landlord and Tenant
        acknowledge and agree that the Tenant Improvements may be completed in
        one (1) or more phases, and that Tenant may present Landlord with
        additional sets of space plans and working drawings with respect to each
        such phase; provided, however, that all Tenant Improvements shall be
        completed on or before May 31, 2002. Landlord shall contribute up to
        four hundred thirty-three thousand dollars ($433,000.00) (the
        "Landlord's Contribution") solely towards (i) Tenant's reasonable,
        actual and verifiable costs for the space plans and working drawings for
        the Tenant Improvements as described above and (ii) the construction
        costs, including permit costs and the aforementioned construction
        administrative fee, for the Tenant Improvements, but excluding Tenant's
        telephone, computer, and data systems, furniture, or other personal
        improvements desired by Tenant. Landlord shall have no obligation to pay
        for design or construction costs of the Tenant Improvements or for
        construction administration fees to the extent the same exceed the
        Landlord's Contribution as set forth above. If Landlord estimates that
        the costs of Tenant Improvements (including the aforementioned
        construction administration fees) will, in the aggregate, exceed the
        Landlord's Contribution, Tenant shall pay such estimated overage to
        Landlord prior to commencement of construction of the pending or
        proposed phase of Tenant Improvements. Tenant shall not be entitled to
        any credit, offset or refund if Landlord is able to construct the Tenant
        Improvements described in the approved space plans and/or working
        drawings for less than the Landlord's Contribution, or if the Tenant
        Improvements are not completed by May 31, 2002. Subject to Force Majeure
        Events, Landlord shall use its best efforts to complete construction of
        the initial phase of the Tenant improvements within sixty (60) days
        following the date on which Tenant provides Landlord with a permit
        permitting Landlord to commence construction of all aspects of such
        Tenant Improvements. Tenant's initial set of space plans and/or working
        drawings for the Tenant Improvements shall provide for material
        improvements to all of the Building's lobbies, the Building's second
        (2nd) and third (3rd) floor corridors, the bathrooms contained in what
        was previously "Common Area" of the Building (ie without giving effect
        to the addition to the Premises of the Expansion Space), and the
        elevator cabs of the Building. All permits shall be processed and
        obtained by Tenant.

10.     Sublease of Expansion Space. The original Tenant hereunder may sublet
        all or any portions of the third (3rd) floor of the Building leased by
        Tenant subject to the restrictions contained in Section 15(g) of the
        Lease applicable to the six thousand (6,000) square feet of Rentable
        Area of the original Premises which the original Tenant may sublease
        without the Landlord's consent; provided, however that the term(s) of
        any such sublease (including option periods) may be up to twenty-four
        (24) months from the Expansion Space Commencement Date as opposed to the
        eighteen (18) month limitation established in said Section 15(g) of the
        Lease.

                                       3
<PAGE>   48

11.     Signage. In addition to Tenant's existing signage rights under the
        Lease, Tenant may install non-exclusive freeway facing Building signage
        identifying Tenant's business name. Tenant shall also have the exclusive
        right to place its business name on the existing monument sign located
        in front of, or immediately adjacent to, the Building; provided,
        however, that Tenant may upon thirty (30) days" notice to Landlord place
        on said monument sign the business name of up to two (2) subtenants
        occupying space in the Building in accordance with the Lease. The
        signage rights granted in this Section 8 shall commence upon the
        Expansion Space Commencement Date, and shall automatically terminate if
        placement of said signage is not completed within one (1) year following
        the Expansion Space Commencement Date. All such signage, including,
        without limitation, the size, dimensions, color and location thereof,
        shall (i) be subject to Landlord's prior approval, (ii) conform to
        Building standards from time to time adopted by Landlord and (iii) and
        comply in all respects with all applicable Laws. Tenant shall pay all
        costs and expenses associated with placement of the signage described in
        this Section 8.

12.     Commencement Date for Initial Premises; Initial Must Take Space
        Commencement Date; Extension of Term. Landlord and Tenant agree that (i)
        the "Commencement Date" for the initial Premises under the Lease will be
        March 27, 2000, (ii) the "Must Take Space Commencement Date" under
        Section 41 of the Lease shall be no later than July 1, 2000 and (iii)
        the Expiration Date of the Term of the Lease for the entire Premises is
        hereby extended to and including May 31, 2007.

13.     Second Must Take Space. On December 1, 2000 (the "Second Must Take Space
        Commencement Date"), the Premises leased to Tenant shall be increased to
        include the Rentable Area identified on Exhibit "A" as the "Second Must
        Take Space" (the "Second Must Take Space"), which the parties agree
        contains five thousand square feet of Rentable Area. Following the
        Second Must Take Space Commencement Date, Tenant's use and occupancy of
        the Second Must Take Space shall be for a term co-terminus with the
        Lease Term (after giving effect to the extension of the Term under
        Section 9 above), and shall otherwise be subject to all applicable terms
        and conditions of this Lease; provided, however, that Landlord shall
        have no obligation to improve the Second Must Take Space beyond the
        improvements to be constructed pursuant to Section 6 above. Tenant shall
        not be required to pay Base Rent for the Second Must Take Space until
        the Second Must Take Space Commencement Date or such earlier date on
        which Tenant commences to occupy any portion of the Second Must Take
        Space, at which time Tenant's Base Rent and other matters in this Lease
        pertaining to the amount of Rentable Area contained within the Premises
        shall be adjusted accordingly, as reasonably determined by Landlord.

14.     Existing Expansion Rights. Tenant's rights under Section 42 of the Lease
        are hereby deleted in their entirety, and shall be of no further force
        or effect.

15.     Telecommunications Services; Business Loss. Landlord shall have no
        obligation or liability whatsoever to Tenant in connection with any
        telecommunications or similar services which Tenant receives from
        others, notwithstanding the fact that Landlord may have (i) introduced
        the provider or facilitator thereof to Tenant or (ii) a preexisting or
        affiliate relationship with such provider or facilitator, and Tenant
        hereby waives any and all claims against Landlord with respect thereto.
        Under no circumstances will Landlord be liable to Tenant for damages to
        Tenant's business or loss of income therefrom.

16.     Other Terms of Occupancy. Except as expressly provided in this Amendment
        to the contrary, Tenant's occupancy of the Expansion Premises and Second
        Must Take Space shall be subject to all of the terms and conditions
        contained in the Lease, including, without limitation, payment of and
        escalations to Base Rent, Building Operating

                                       4
<PAGE>   49

        Expenses and Building Tax Expenses based upon the addition to the
        Premises of the Expansion Premises and the Second Must Take Space.

17.     Miscellaneous.

        a.      Landlord and Tenant acknowledge and agree that this Amendment is
                subject to Landlord's receiving from its mortgagee(s) approval
                of all of the terms contained herein.

        b.      The terms used herein shall have the same meaning as those
                defined in the Lease unless expressly contradicted in this
                Amendment.

        c.      The submission of the Amendment is only an invitation to deal
                and shall not be deemed an offer by Landlord. Only a fully
                executed and delivered Amendment shall bind the parties hereto.

        d.      In the event of a conflict between the provisions of this
                Amendment and those of the Lease, the provisions of this
                Amendment shall control. Except for purposes of determining
                whether a conflict exists between the Lease and this Amendment,
                the term "Lease" as used herein shall include the provisions of
                this Amendment. The Lease and this Amendment are deemed to have
                been jointly prepared by the parties, and shall not be
                interpreted against any party as drafter.

        e.      Except as expressly provided herein, all of the terms and
                provisions contained in the Lease remain unmodified.

        IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment as
of the date first set forth above.

"TENANT"                                       "LANDLORD"
IXIA, a California corporation (formerly
known as IXIA COMMUNICATIONS, INC., a          MALIBU CANYON OFFICE PARTNERS,
California corporation)                        LLC, a California limited
                                               liability company

                                               By:  MB Real Estate, Inc.,
By:    /s/ Errol Ginsberg                           a California corporation,
   ----------------------------------------         Managing Member

Print Name:    Errol Ginsberg                       By:  /s/ Calvin H. Johnston
           --------------------------------             ------------------------
                                                         Calvin H. Johnston,
Its:           President                                 President
    ---------------------------------------

By:     /s/ Thomas Miller
   ----------------------------------------

Print Name:    Thomas Miller
           --------------------------------

Its:    Chief Financial Officer
    ---------------------------------------

                                       5

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