Document:

<PAGE>

                                                                    EXHIBIT 10.5

                                                           Date: April 28, 1999
Bank Hapoalim B.M.
Head Office
45 Rothschild Blvd.
Tel-Aviv

                   Re: Intention Letter For Granting Credit
                   ----------------------------------------

Dear Sirs:

     This letter sets out our mutual agreement as follows:

1.   Pursuant to an Interim Letter for Granting Credit dated March 7, 1999 (the
     "Intention Letter"), Bank Hapoalim B.M. (the "Bank") has agreed to provide
     Accord Video Telecommunications Ltd. (the "Company") with a credit line in
     the amount of US$4,000,000 (the "Credit Line") and the Company agreed to
     grant the Bank an option to acquire shares in the Company. The Company and
     the Bank have since agreed that such option will be in the form of a
     Warrant in the form annexed hereto (the "Warrant").

2.   Pursuant to Section 10 of the Warrant, certain registration rights granted
     by the Warrant are subject to the consent of the shareholders of the
     Company and pursuant to Section 11 of the Warrant, the Warrant is subject
     to and conditional upon the waiver or non-exercise by all shareholders of
     the Company of certain pre-emptive rights.

3.   The Company and the Bank have agreed that the Company will use its
     reasonable efforts to obtain the Consents and Waiver referred to in Section
     2 above (the "Consent and Waiver") within the period of thirty-five (35)
     days following the Effective Date, as defined in the Warrant (the "Interim
     Period").

4.   Until the Consent and Waiver is obtained, the amount of the Credit Line
     utilized shall not exceed US$2,000,000. Once the Consent and Waiver is
     obtained the Credit Line shall be utilizable in full.

5.   In the event the Company has not informed the Bank of the receipt of the
     Consent and Waiver prior to the expiration of the Interim Period, the
     Warrant shall be null and void. In such case the Bank shall have the right,
     exercisable by written notice to the Company given within five (5) days of
     the end of the Interim Period, to demand immediate payment of all amounts
     outstanding pursuant to the Credit Line. The Bank's rights pursuant to this
     Section 5 shall constitute its sole and exclusive remedy in respect of the
     failure of the Company to obtain the Consent and Waiver.

Please indicate your acceptance of the foregoing in the space provided below.

                                                       Sincerely yours,

                                                       /s/ [ILLEGIBLE]
                                                 ------------------------------
                                                 Accord Telecommunications Ltd.

Agreed to and accepted:

/s/ [ILLEGIBLE]
-----------------------
Bank Hapoalim B.M.
<PAGE>

                               FORM OF WARRANT

                                      -1-

THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT HAVE NOT
BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT") OR QUALIFIED UNDER ANY STATE OR FOREIGN SECURITIES LAW, AND
MAY NOT BE SOLD, TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT COVERING THIS WARRANT
AND/OR SUCH SECURITIES, OR THE HOLDER RECEIVES AN OPINION OF COUNSEL FOR THE
HOLDER OF THIS WARRANT AND/OR SUCH SECURITIES SATISFACTORY TO THE COMPANY
STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE
REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF THE SECURITIES ACT AND THE
QUALIFICATION REQUIREMENTS UNDER APPLICABLE STATE OR FOREIGN LAW.

                      WARRANT TO PURCHASE ORDINARY SHARES
                      -----------------------------------

Accord Telecommunications Ltd., an Israeli company (the "Company") hereby grants
to Hapoalim Nechasim (Menayot) Ltd. (the "Holder"), the right to purchase from
the Company the number of Ordinary Shares of the Company, nominal value NIS 0.01
(the "Ordinary Shares") specified below, subject to the terms and conditions set
forth below, effective as of ___________________, 1999 (the "Effective Date").

1.   Number of Ordinary Shares Available for Purchase
     ------------------------------------------------

     This Warrant may be exercised to purchase that number of the Company's
     Ordinary Shares having an aggregate exercise price in an amount equivalent
     to five hundred thousand United States dollars (US$500,000), at an exercise
     price per each Ordinary Share which shall be calculated as set forth in
     Section 2 below, subject to adjustments under Section 8 of this Warrant
     (the "Warrant Shares").

2.   Exercise Price
     --------------

     The exercise price for each Warrant Share purchasable hereunder shall be
     calculated as set forth below, subject to adjustments under Section 8 of
     this Warrant (the "Warrant Price"):

     (i)  in the event that during the twelve (12) month period immediately
     following the Effective Date, the Company shall: (a) issue its securities
     in a Qualified Financing (as such term is defined below in this Section 2);
     (b) issue its securities in an Initial Public Offering (as such term is
     defined below in this Section 2); (c) enter into a sale of all or
     substantially all of the Company's property and assets; or (d) enter into a
     merger or consolidation of the Company with or into another corporation;
     (such transactions described in (a) through (d) above are collectively
     referred to as "Liquidity Events"), the exercise price for each Warrant
     Share purchasable hereunder shall be equal to eighty percent (80%) of the
     price per share paid by purchasers of the Company's

<PAGE>

                                      -2-

     securities in the Liquidity Event (the "Event Price");

     (ii) in the event that during the twelve (12) month period immediately
     following the Effective Date, the Company shall not undergo a Liquidity
     Event, then the exercise price for each Warrant Share purchasable hereunder
     during the period beginning twelve (12) months and one (1) day immediately
     following the Effective Date shall be the lower of: (i) the Event Price (in
     the event that the Company has undergone a Liquidity Event prior to the
     exercise of this Warrant); or (ii) a price per share reflecting a Company
     valuation of eighty million United States dollars (US$80,000,000), and
     shall be equal to a fraction, the numerator of which is eighty million
     United States dollars (US$80,000,000), and the denominator of which is the
     total number of issued and outstanding shares of the Company at the time of
     exercise (on a fully diluted and as-converted basis, taking into account
     all convertible securities, convertible loans, warrants, options and all
     other rights, whatsoever, to receive shares outstanding at the time of
     exercise).

     For the purpose of this Warrant, the term "Qualified Financing" shall mean
     the closing of the first financing after the date hereof in which the
     Company issues equity securities and in which persons and/or entities
     contribute aggregate gross proceeds to the Company in such financing in
     excess of Two Million United States Dollars (US$2,000,000); provided,
                                                                 --------
     however, that such financing shall not include issuances of the equity
     -------
     securities to the Company's existing shareholders immediately prior to such
     financing for consideration not reflective of the fair market value of such
     equity securities.

     For purposes of this Warrant "Initial Public Offering" shall mean the first
     underwritten public offering pursuant to an effective registration
     statement under the Securities Act, or any other comparable securities
     laws, covering the offering and sale of shares of Ordinary Shares for the
     account of the Company (other than a registration statement effected solely
     to implement an employee benefit plan, a transaction in which Rule 145 of
     the Securities and Exchange Commission is applicable or any other form or
     type of registration in which the Ordinary Shares cannot be included
     pursuant to the Securities and Exchange Commission rules of practice).

3.   Term
     ----

     This Warrant may be exercised, in whole, or in part, during the period
     beginning on the date of this Warrant and ending on the date which is the
     earlier of: (a) three (3) years following the date of this Warrant; (b) the
     closing of a sale of all or substantially all of the Company's property and
     assets, or (c) the closing of a merger or consolidation of the Company with
     or into another corporation; provided, however, that this Warrant may be
                                  --------  -------
     exercised during the twelve (12) months period following the Effective Date
     only in connection with or following the occurrence of a Liquidity Event.

4.   Exercise of Warrant
     -------------------

     This Warrant may be exercised in whole or in part on one or more occasions
     during its term. This Warrant may be exercised by the surrender of this
     Warrant to the Company at its principal office or at such other office or
     agency as the Company may designate

<PAGE>

                                      -3-

     in writing together with the appropriate Notice of Exercise in the form
     annexed hereto duly completed and executed on behalf of the Holder.

     a.   Exercise for Cash
          -----------------

          To exercise for cash, the Notice of Exercise must be accompanied by
          payment in full of the amount of the aggregate purchase price of the
          Warrant Shares being purchased upon such exercise in immediately
          available funds.

     b.   Net Exercise
          ------------

          In lieu of the payment method set forth in Section 4(a) above, subject
          to the occurrence of a Liquidity Event, the Holder may elect to
          exchange this Warrant for a number of Warrant Shares equal to the
          increase in value of the Warrant Shares otherwise purchasable
          hereunder on the date of exchange. If the Holder elects to exchange
          this Warrant as provided in this Section 4(b), the Holder shall tender
          to the Company this Warrant along with the Notice of Exercise as
          provided in the introductory clause to this Section 4, and the Company
          shall issue to the Holder the number of Warrant Shares computed using
          the following formula:

          X = Y (A-B)
              -------
                 A

          Where X = the number of Warrant Shares to be issued to the Holder.

          Y = the number of Warrant Shares which would otherwise have been
          purchasable under this Warrant (as adjusted to the date of such
          calculation, but excluding those Warrant Shares already issued under
          this Warrant).

          A = the Fair Market Value (as defined below) of one share of the
          Company's Ordinary Shares.

          B = The Warrant Price

          "Fair Market Value" of an Ordinary Share shall mean:

          (i)     If the Company's Ordinary Shares are listed on a national
                  securities exchange or are quoted on the National Association
                  of Securities Dealers, Inc. Automated Quotation/National
                  Market System (NASDAQ/NMS), then the closing or last sale
                  price, respectively, reported for the exercise date.

          (ii)    If the Company's Ordinary Shares are not listed on a national
                  securities exchange or quoted on NASDAQ/NMS, but are traded in
                  the over-the-counter market, then the mean of the closing bid
                  and asked prices as reported for the exercise date.

          (iii)   Except as set forth in subsection 4.b.(iv) (below), if the
                  Company's

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                                      -4-

                  Ordinary Shares are not publicly traded, then as determined by
                  the Company's Board of Directors in good faith.

          (iv)    If the exercise date is the date of closing of a public
                  offering of the Company's Ordinary Shares pursuant to an
                  effective registration statement under the Securities Act,
                  then the public offering price (before deduction of discounts,
                  commissions or expenses) in such offering.

           In the event of a net exercise, this entire Warrant must be
           surrendered, and no new Warrant shall be issued.

     c.   Issuance of Shares on Exercise
          ------------------------------

          The Company agrees that the Warrant Shares so purchased be issued as
          soon as practicable thereafter, and that the Holder shall be deemed
          the record owner of such Warrant Shares as of and from the close of
          business on the date on which this Warrant shall be surrendered,
          together with payment in full as required above. In the event of a
          partial exercise, the Company shall concurrently issue to the Holder a
          replacement Warrant on the same terms and conditions as this Warrant,
          but representing the number of Warrant Shares remaining after such
          partial exercise.

     d.   Conditional Exercise
          --------------------

          In any connection with a Liquidity Event, such exercise may be made
          conditional upon the completion of such Liquidity Event.

5.   Fractional Interest
     -------------------

     No fractional shares will be issued in connection with any exercise
     hereunder, but in lieu of such fractional shares the Company shall make a
     cash payment therefor upon the basis of the current market price of such
     shares then in effect as determined in good faith by the Company's Board of
     Directors.

6.   Warrant Confers No Rights of Shareholder
     ----------------------------------------

     Except as otherwise set forth in this Warrant, the Holder shall not have
     any rights as a shareholder of the Company with regard to the Warrant
     Shares prior to actual exercise resulting in the purchase of any Warrant
     Shares.

7.   Investment Representation
     -------------------------

     Neither this Warrant nor the Warrant Shares issuable upon the exercise of
     this Warrant have been registered under the Securities Act, or any other
     securities laws. The Holder acknowledges by acceptance of this Warrant that
     (a) it has acquired this Warrant for investment and not with a view to
     distribution; (b) it has either a pre-existing personal or business
     relationship with the Company, or its executive officers, or by reason of
     its business or financial experience, it has the capacity to protect its

<PAGE>

                                      -5-

     own interests in connection with the transaction; and (c) it is an
     accredited investor as that term is defined in Regulation D promulgated
     under the Securities Act. The Holder agrees that any Warrant Shares
     issuable upon exercise of this Warrant will be acquired for investment and
     not with a view to distribution and such Warrant Shares will not be
     registered under the Securities Act and applicable state securities laws
     and that such Warrant Shares may have to be held indefinitely unless they
     are subsequently registered or qualified under the Securities Act and
     applicable state securities laws, or based on an opinion of counsel
     reasonably satisfactory to the Company, an exemption from such registration
     and qualification is available. The Holder, by acceptance hereof, consents
     to the placement of legend(s) on all securities hereunder as to the
     applicable restrictions on transferability in order to ensure compliance
     with the Securities Act, unless in the opinion of counsel for the Company
     such legend is not required in order to ensure compliance with the
     Securities Act. The Company may issue stop transfer instructions to its
     transfer agent in connection with such restrictions.

8.   Adjustment of Warrant Price and Number of Shares
     ------------------------------------------------

     The number and kind of securities purchasable initially upon the exercise
     of this Warrant and the Warrant Price shall be subject to adjustment from
     time to time upon the occurrence of certain events, as follows:

     a.   Adjustment for Shares Splits and Combinations  If the Company at
          ---------------------------------------------
          any time or from time to time effects a subdivision of the outstanding
          Ordinary Shares, the number of Ordinary Shares issuable upon exercise
          of this Warrant immediately before the subdivision shall be
          proportionately increased, and conversely, if the Company at any time
          or from time to time combines the outstanding Ordinary Shares, the
          number of Ordinary Shares issuable upon exercise of this Warrant
          immediately before the combination shall be proportionately decreased.
          Any adjustment under this Section 8(a) shall become effective at the
          close of business on the date the subdivision or combination becomes
          effective.

     b.   Adjustment for Certain Dividends and Distributions  In the event
          --------------------------------------------------
          the Company at any time, or from time to time makes, or fixes a record
          date for the determination of holders of Ordinary Shares entitled to
          receive a dividend or other distribution payable in additional shares
          of Ordinary Shares, then and in each such event the number of Ordinary
          Shares issuable upon exercise of this Warrant shall be increased as of
          the time of such issuance or, in the event such a record date is
          fixed, as of the close of business on such record date, by multiplying
          the number of Ordinary Shares issuable upon exercise of this Warrant
          by a fraction: (i) the numerator of which shall be the total number of
          Ordinary Shares issued and outstanding immediately prior to the time
          of such issuance or the close of business on such record date plus the
          number of Ordinary Shares issuable in payment of such dividend or
          distribution, and (ii) the denominator of which is the total number of
          shares of Ordinary Shares issued and outstanding immediately prior to
          the time of such issuance or the close of business on such record
          date; provided, however, that if such record date is fixed and such
                -----------------
          dividend is not fully paid or if such distribution is not fully made
          on the date fixed thereof, the number of Ordinary Shares issuable

<PAGE>

                                      -6-

          upon exercise of this Warrant shall be recomputed accordingly as of
          the close of business on such record date and thereafter the number of
          shares of Ordinary Shares issuable upon exercise of this Warrant shall
          be adjusted pursuant to this Section 8(b) as of the time of actual
          payment of such dividends or distributions.

     c.   Adjustments for Other Dividends and Distributions.  In the event
          -------------------------------------------------
          the Company at any time or from time to time makes, or fixes a record
          date for the determination of holders of Ordinary Shares entitled to
          receive a dividend or other distribution payable in securities of the
          Company other than Ordinary Shares, then in each such event provision
          shall be made so that the Holder shall receive upon exercise of this
          Warrant, in addition to the number of Ordinary Shares receivable
          thereupon, the amount of securities of the Company that the Holder
          would have received had this Warrant been exercised for Ordinary
          Shares immediately prior to such event (or the record date for such
          event) and had the Holder thereafter, during the period from the date
          of such event to and including the date of exercise, retained such
          securities receivable by it as aforesaid during such period, subject
          to all other adjustments called for during such period under this
          Section and the Company's Articles of Association with respect to the
          rights of the Holder.

     d.   Adjustment for Reclassification, Exchange and Substitution  If
          ----------------------------------------------------------
          the Ordinary Shares issuable upon the exercise of this Warrant are
          changed into the same or a different number of shares of any class or
          classes of shares of the Company, whether by recapitalization,
          reclassification or otherwise (other than a subdivision or combination
          of shares or shares dividend provided for elsewhere in this Section),
          then and in any such event the Holder shall have the right thereafter
          to exercise this Warrant into the kind and amount of shares and other
          securities receivable upon such recapitalization, reclassification or
          other change, by holders of the number of shares of Ordinary Shares
          for which this Warrant might have been exercised immediately prior to
          such recapitalization, reclassification or change, all subject to
          further adjustment as provided herein and under the Company's Articles
          of Association.

     e.   General Protection. The Company will not, by amendment of its
          ------------------
          Articles of Association or through any reorganization,
          recapitalization, transfer of assets, consolidation, merger,
          dissolution, issue or sale of securities or any other voluntary
          action, avoid or seek to avoid the observance or performance of any of
          the terms to be observed or performed hereunder, or impair the
          economic interest of the Holder, but will at all times in good faith
          assist in the carrying out of all the provisions hereof and in taking
          of all such actions and making all such adjustments as may be
          necessary or appropriate in order to protect the rights and the
          economic interests of the Holder against impairment.

     f.   Notice of Capital Changes.  If at any time the Company shall
          -------------------------
          offer for subscription pro rata to the holders of Ordinary Shares any
                                 --------
          additional shares of any class, other rights or any equity security of
          any kind, or there shall be any capital reorganization or
          reclassification of the capital shares of the Company, or
          consolidation or merger of the Company with, or sale of all or
          substantially all of its assets to another company or there shall be a
          voluntary or involuntary

<PAGE>

                                      -7-

          dissolution, liquidation or winding up of the Company, or other
          transaction described in this Section 8, then, in any one or more of
          said cases, the Company shall give the Holder written notice, by
          registered or certified mail, postage prepaid, of the date on which
          (i) a record shall be taken for such subscription rights or (ii) such
          reorganization, reclassification, consolidation, merger, sale,
          dissolution, liquidation or winding up shall take place, as the case
          may be. Such notice shall also specify the date as of which the
          holders of record of Ordinary Shares shall participate in such
          subscription rights, or shall be entitled to exchange their Ordinary
          Shares for securities or other property deliverable upon such
          reorganization, reclassification, consolidation, merger, sale,
          dissolution, liquidation or winding up, as the case may be. Such
          written notice shall be given at least fourteen (14) days prior to the
          action in question and not less than fourteen (14) days prior to the
          record date in respect thereto.

     g.   Adjustment of Warrant Price.  Upon each adjustment in the number
          ---------------------------
          of Ordinary Shares purchasable hereunder, the Warrant Price shall be
          proportionately increased or decreased, as the case may be, in a
          manner that is the inverse of the manner in which the number of
          Ordinary Shares purchasable hereunder shall be adjusted.

     h.   Notice of Adjustments.  Whenever the Warrant Price or the number
          ---------------------
          of Ordinary Shares purchasable hereunder shall be adjusted pursuant to
          Section 8 hereof, the Company shall prepare a certificate setting
          forth, in reasonable detail, the event requiring the adjustment, the
          amount of the adjustment, the method by which such adjustment was
          calculated, and the Warrant Price and the number of Ordinary Shares
          purchasable hereunder after giving effect to such adjustment, and
          shall cause copies of such certificate to be mailed (by first class
          mail, postage prepaid) to the Holder.

9.   Transfer of This Warrant or Securities Issuable on Exercise Hereof
     ------------------------------------------------------------------

     With respect to any offer, sale or other disposition of this Warrant or
     securities into which such Warrant may be exercised, the Holder will give
     written notice to the Company prior thereto, describing briefly the manner
     thereof, together with, if requested by the Company, a written opinion of
     such Holder's counsel, to the effect that such offer, sale or other
     distribution may be effected without registration or qualification (under
     any federal or state law then in effect). Such opinion letter and all such
     transferees must warrant and represent that they are an "accredited"
     investor as that term is defined under Regulation D of the Securities Act.
     Promptly, as practicable, upon receiving such written notice and opinion
     and warranties and representations, if so requested, the Company, as
     promptly as practicable, shall deliver to the Holder one or more
     replacement Warrant certificates on the same terms and conditions as this
     Warrant for delivery to the transferees. Each Warrant thus transferred and
     each certificate representing the securities thus transferred shall bear
     legend(s) as to the applicable restrictions on transferability in order to
     ensure compliance with the Securities Act, unless in the opinion of counsel
     for the Company such legend is not required in order to ensure compliance
     with the Securities Act. The Company may issue stop transfer instructions
     to its transfer agent in connection with such restrictions. Any provision
     of this Warrant to the contrary notwithstanding, the

<PAGE>

                                      -8-

     Holder may not offer, sell or otherwise dispose of this Warrant to any
     third party, other than (i) to a wholly owned subsidiary of Bank Hapoalim
     B.M., or (ii) to any other transferee approved by the Company in writing
     with such approval not to be unreasonably withheld, provided that all
     transfers pursuant to clauses (i) and (ii) above or otherwise are subject
     to any restrictions on transfer contained in the Articles of Association of
     the Company as in effect from time to time.

10.  Registration Rights
     -------------------

     The Company covenants and agreed as follows:

     a.   Definitions  For purposes of this Section 10:
          -----------

               "Registrable Shares" means (i) the Warrant Shares, and (ii) any
               Ordinary Shares of the Company issued as (or issuable upon the
               conversion or exercise of any warrant, right or other security
               that is issued as) a dividend or other distribution with respect
               to, or in exchange for or in replacement of, such Warrant Shares;
               provided, however, that any exercise of this Warrant in
               connection with an exercise of rights to registration under this
               Section 10 may be made conditional upon the closing of the
               offering contemplated by such registration.

     b.   Subject to the requisite consent of shareholders of the Company as
          provided in Section 13(o)(i) of the Subscription Agreement dated
          February 28, 1996 between the Company and certain of its shareholders
          (the "Subscription Agreement"), the Holder shall be entitled to
          "incidental" registration rights in respect of the Registrable Shares,
          pari passu with the holders of the outstanding Ordinary Shares of the
          Company described in Section 13(a)(i)(A) of the Subscription
          Agreement, in accordance with Section 13 of the Subscription Agreement
          as such rights may be amended from time to time in accordance with the
          Subscription Agreement or any successor document granting such rights.
          By accepting this Warrant, the Holder agrees to be subject to the
          corresponding obligations of the Holder of "incidental" registration
          rights (including market stand-off or "lock-up" obligations) contained
          in the Subscription Agreement or any amendment thereto or to the
          rights therein, as aforesaid. If the Company has requested the Holder
          to adhere to a stand-off period as aforesaid, the Exercise Period of
          this Warrant shall be extended for a period equal to the term of the
          stand-off period requested by the Company.

     c.   Assignment of Registration Rights.  The rights to cause the Company to
          ---------------------------------
          register Registrable Shares pursuant to the registration rights set
          forth in this Section 10 (the "Registration Rights") may be assigned
          by a Holder to a transferee or assignee of all such securities to the
          same extent as permitted by Section 9 of this Warrant.

     d.   No Conflicting Agreements.  The Company represents and warrants to the
          -------------------------
          Holder that the Company is not a party to any agreement that conflicts
          in any manner with the Holder's rights to cause the Company to
          register Registrable

<PAGE>

                                      -9-

          Shares pursuant to the Registration Rights. The Company covenants and
          agrees that it shall not, without the prior written consent of the
          holders of a majority of the outstanding Registrable Securities,
          amend, modify or restate the Registration Rights if the Holder would
          be adversely affected by the amendment in a different manner than
          other holders of "Registrable Shares" similarly situated.

     e.   Rights and Obligations Survive Exercise and Expiration of Warrant  The
          -----------------------------------------------------------------
          rights and obligations of the Company and the Holder set forth in this
          Section 10 and in the Registration Rights shall survive the exercise,
          conversion and expiration of this Warrant.

11.  Representations and Warranties.
     ------------------------------

     The Company represents and warrants to the Holder that this Warrant is
     subject to and conditional upon the waiver by all shareholders of the
     Company of their preemptive rights pursuant to the Articles of Association
     of the Company and the Subscription Agreement, and the receipt of any
     approvals required of or filings required with Israeli governmental
     entities and Israeli banks, and that other than as aforesaid:

     a.   This Warrant has been duly authorized and executed by the Company and
          is a valid and binding obligation of the Company enforceable in
          accordance with its terms.

     b.   The Warrant Shares are duly authorized and reserved for issuance by
          the Company and, when issued in accordance with the terms hereof, will
          be validly issued, fully paid and nonassessable and not subject to any
          preemptive rights.

     c.   The execution and delivery of this Warrant are not, and the issuance
          of the Warrant Shares upon exercise of this Warrant in accordance with
          the terms hereof will not be, inconsistent with the Company's Articles
          of Association, do not and will not contravene any law, governmental
          rule or regulation, judgment or order applicable to the Company, and,
          except for consents that have already been obtained by the Company, do
          not and will not conflict with or contravene any provision of, or
          constitute a default under, any indenture, mortgage, contract or other
          instrument of which the Company is a party or by which it is bound or
          require the consent or approval of, the giving of notice to, the
          registration with or the taking of any action in respect of or by, any
          Federal, state or local government authority or agency or other
          person.

12.  Expenses
     --------

     The Company will pay the Israeli Stamp Duty on the issuance of the Warrant
     Shares, and will notify the Israeli Companies Registrar of such issuance
     within the time period required by law. The Stamp Duty on this Warrant, if
     any, will be paid in full by the Company.

13.  Loss, Theft, Destruction or Mutilation of Warrant
     -------------------------------------------------

<PAGE>

                                      -10-

     Upon receipt by the Company of evidence reasonably satisfactory to it of
     the loss, theft, destruction or mutilation of any Warrant or Shares
     certificate, and in case of loss, theft or destruction, of indemnity, or
     security reasonably satisfactory to it, and upon reimbursement to the
     Company of all reasonable expenses incidental thereto, and upon surrender
     and cancellation of such Warrant or Shares certificate, if mutilated, the
     Company will make and deliver a new Warrant or Shares certificate of like
     tenor and dated as of such cancellation, in lieu of such Warrant or Shares
     certificate.

14.  Notices
     -------

     Any notice or other communication hereunder shall be in writing and shall
     be deemed to have been given upon delivery, if personally delivered or
     three business days after deposit if deposited in the mail for mailing by
     certified mail, postage prepaid, and addressed as follows:

     If to Holder:         c/o Bank Hapoalim B.M.
                           Electronics Group - Industrial Sector
                           41-45 Rothschild Blvd.
                           Tel Aviv, Israel
                           attn.: Ruthi Simha
                           fax: 03-567-5699

     If to Company:        Accord Telecommunications Ltd.
                           10 Martin Gehl Street
                           Kiryat Arieh, Petach Tikva, 49130 Israel
                           attn.: Ori Shachar
                           fax: 03-921-1571

     Each of the above addressees may change its address for purposes of this
paragraph by giving to the other addressees notice of such new address in
conformance with this paragraph.

15.  Applicable Law; Jurisdiction
     ----------------------------

     This Warrant shall be governed by and construed in accordance with the laws
     of the State of Israel as applicable to contracts between two residents of
     the State of Israel entered into and to be performed entirely within the
     State of Israel. Any dispute arising under or in relation to this Warrant
     shall be resolved exclusively in the competent court for Tel Aviv-Jaffa
     district, and each of the parties hereby submits irrevocably to the
     exclusive jurisdiction of such court.

16.  Entire Agreement
     ----------------

<PAGE>

                                      -11-

     This Warrant constitutes the entire agreement between the parties hereto
     with regard to the subject matters hereof, and supersedes any prior
     communications, agreements and/or understandings between the parties hereto
     with regard to the subject matters hereof.

     Dated:  ______________, 1999

     ACCORD TELECOMMUNICATIONS LTD.

     By:  ________________________

     Title:  _____________________

<PAGE>

                                      -12-

                               NOTICE OF EXERCISE

To:

1.   The undersigned hereby elects to purchase _________ shares of Ordinary
     Shares of ____________, pursuant to the terms of the attached Warrant, and
     tenders herewith payment of the purchase price for such shares in full.

                                      OR

1.   The undersigned hereby elects to exchange the attached Warrant for ______
     Ordinary Shares of ______________ on a Net Exercise basis, pursuant to the
     terms of the attached Warrant.

2.   In exercising this Warrant, the undersigned hereby confirms and
     acknowledges that the shares of Ordinary Shares are being acquired solely
     for the account of the undersigned and not as a nominee for any other
     party, or for investment, and that the undersigned will not offer, sell or
     otherwise dispose of any such shares of Ordinary Shares except under
     circumstances that will not result in a violation of the Securities Act of
     1933, as amended, or any state securities laws.

3.   Please issue a certificate representing said shares of Ordinary Shares in
     the name of the undersigned.

4.   Please issue a new Warrant for the unexercised portion of the attached
     Warrant in the name of the undersigned.

_________________________           _________________________
(Date)                              (Print Name)

                                    _________________________
                                    (Signature)<PAGE>

                               EXHIBIT NO. 10.7

              Lease Agreement dated July 21, 1997 by and between
                the Registrant and 500 Northridge Pointe, Inc.
              --------------------------------------------------
<PAGE>

                                 CONFIDENTIAL

                        OFFICE BUILDING LEASE AGREEMENT

                                  THE POINTE
                                 BUILDING 500

                                   LANDLORD:

                          500 NORTHRIDGE POINTE, INC.

                                    TENANT:

                     ACCORD VIDEO TELECOMMUNICATIONS, INC.
<PAGE>

<TABLE>
<CAPTION>

                            TABLE OF CONTENTS
<S>                                                                    <C>
Section/Description                                                   Page
-------------------                                                   ----

 1.0  Definitions and Basic Provisions................................  1
 2.0  Lease Grant.....................................................  2
 3.0  Rent............................................................  3
 4.0  Consumer Price Index Increases: Operating Costs Escalations.....  4
 5.0  Landlord's Obligations..........................................  6
 6.0  Tenant Improvements.............................................  7
 7.0  Permitted Use...................................................  9
 8.0  Tenant's Repairs and Alterations................................ 10
 9.0  Subletting and Assigning........................................ 10
10.0  Indemnity....................................................... 12
11.0  Subordination and Mortgagee's Right to Cure Landlord's
      Defaults........................................................ 13
12.0  Rules and Regulations........................................... 13
13.0  Inspection...................................................... 13
14.0  Condemnation.................................................... 14
15.0  Fire or Other Casualty.......................................... 14
16.0  Holding Over.................................................... 14
17.0  Taxes on Tenant's Property...................................... 14
18.0  Events of Default............................................... 15
19.0  Remedies........................................................ 15
20.0  Attorneys' Fees................................................. 16
21.0  Security Interest............................................... 16
22.0  Mechanic's Lien................................................. 17
23.0  Waiver of Subrogation........................................... 17
24.0  Tenant's Insurance.............................................. 18
25.0  Brokerage....................................................... 18
26.0  Change of Building Name......................................... 19
27.0  Estoppel Certificates........................................... 19
28.0  Notices......................................................... 19
</TABLE>
<PAGE>

<TABLE>

<S>                                                                    <C>
29.0  Force Majeure................................................... 19
30.0  Severability.................................................... 19
31.0  Counterpart Signatures; Amendments; Binding Effect.............. 19
32.0  Quiet Enjoyment................................................. 20
33.0  Gender.......................................................... 20
34.0  Joint and Several Liability..................................... 20
35.0  Captions........................................................ 20
36.0  Exhibits and Attachments........................................ 20
37.0  No Joint Venture................................................ 20
38.0  Time of the Essence............................................. 20
39.0  Evidence of Authority........................................... 20
40.0  Governing Law................................................... 20
41.0  Entire Agreement................................................ 20
42.0  Exculpation..................................................... 20
43.0  Covenants are Independent....................................... 21
44.0  Usufruct........................................................ 21
45.0  Right to Relocate............................................... 21
46.0  Hazardous Materials............................................. 21
47.0  Letter of Credit................................................ 22
48.0  Special Provisions.............................................. 23
</TABLE>
<PAGE>

                                 500 NORTHRIDGE

                        OFFICE BUILDING LEASE AGREEMENT

    This Lease Agreement ("Lease") is entered into as of the ___ day of July,
1997, by and between 500 Northridge Pointe, Inc. ("Landlord") and Accord Video
Telecommunications, Inc., a _____________ corporation ("Tenant").

                             W I T N E S S E T H:

1.0  Definitions and Basic Provisions. Certain definitions and basic provisions
(the "Basic Lease Information") of this Lease are:

     1.1  Base Rent: $130,789.45 per annum, payable in monthly installments of
$10,899.12.

     1.2  Base Year: 1997.

     1.3  Building: The office building located at 500 Northridge Road, Atlanta,
Georgia 30350, commonly known as Building 500, at The Pointe, which is located
on the land more particularly described on Exhibit "A" attached hereto and made
a part hereof.

     1.4  Commencement Date: The earlier of (a) the date on which Substantial
Completion of the Tenant's Work occurs or is deemed to occur (as described in
Section 6 below), and Landlord tenders possession of the Premises to Tenant, or
(b) the date on which Tenant occupies the Premises for the conduct of business.

     1.5  Landlord: 500 Northridge Pointe, Inc., a Georgia corporation.

     1.6  Landlord's Address: LaSalle Partners Management Limited
                              200 E. Randolph
                              Chicago, IL 60601
          Contact:            500 Northridge Pointe, Inc. Portfolio Manager
                              Telephone: (312) 782-5800

          Copy to:            LaSalle Partners Management Limited
                              500 Northridge Road / Suite 110
                              Atlanta, GA 30350-3352
                              Attn: General Manager
                              Telephone: (770) 641-3500

     1.7  Lease Term: This Lease shall commence on the date of its execution
and delivery by both Landlord and Tenant, but, except for the obligations of
the parties under Section 6 of this Lease, the term of this Lease shall commence
on the Commencement Date and shall continue for sixty (60) months until the
last day of the 60th full calendar month following the calendar month in which
the Commencement Date occurs. The parties hereby acknowledge and agree that the
target Commencement Date is September 15, 1997.

     1.8  Lease Year: The period of twelve (12) calendar months or less
commencing with the Commencement Date and ending at midnight on the following
December 31, each successive period of twelve (12) calendar months thereafter
during the Lease Term, and the final period of twelve (12) calendar months or
less commencing on January 1 of the calendar year in which the Lease Term
expires. During any Lease Year within the Lease Term that is less than twelve
(12) full months, any amount to be paid with respect to such period shall be
prorated, based on the actual number of months and the actual number of days of
any partial month assuming each month to have thirty (30) days.

     1.9  Permitted Use:   General office purposes.

                                       1
<PAGE>

     1.10 Premises: The office space containing approximately 6,427 rentable
square feet of space, known as Suite No. 200, which is located in the Building,
a floor plan of which is depicted on Exhibit "A-1" attached hereto and made a
part hereof.

     1.11 Project: The Building, together with the land on which it is situated,
which is more particularly described in Exhibit "A" hereto.

     1.12 Security Deposit: $10,899.12.

     1.13 Substantial Completion: The terms "Substantial Completion" or
"Substantially Complete" shall have the meaning ascribed in Section 6.6 hereof.

     1.14 Tenant: Accord Video Telecommunications, Inc.

     1.15 Tenant's Address: 500 Northridge Rd. / Suite 200
                            Atlanta, GA 30350
                            Contact:  Mr. Jules DeVigne
                            Telephone:

     1.16 Tenant's Allowance: $6.00, multiplied by the number of rentable
square feet contained within the Premises or $38,562.00 in the aggregate, which
Landlord agrees to contribute to the cost of Tenant's Work.

     1.17 Tenant's Designated Representative: Jules DeVigne, who shall be
Tenant's authorized and designated representative for purposes of dealing with
Landlord as to all matter affecting Tenant's Work and the final plans and
specifications therefor.

     1.18 Tenant's Share: The percentage that expresses the ratio between the
number of rentable square feet comprising the Premises (6,427), and the number
of rentable square feet of the Building (156,281), which, for the purposes of
the Lease, shall be 4.11%.

     1.19 Tenant's Work: All of the tenant improvements to be constructed or
installed in or about the Premises, as shown on the Construction Documents more
particularly described in Section 6.1 hereof, and which Construction Documents
Landlord and Tenant each shall use their diligent, good faith efforts to approve
by July 30, 1997.

2.0  Lease Grant.

     2.1  In consideration of rent to be paid and the other covenants and
agreements to be performed by Tenant and upon the terms hereinafter stated,
Landlord hereby leases the Premises to Tenant, and Tenant hereby leases the
Premises from Landlord, for the Lease Term, unless sooner terminated as herein
provided. No easement for light, air or view is granted, given or implied
herein.

     2.2  If this Lease is executed before the Premises become vacant, or
otherwise available and ready for occupancy, or if any present tenant or
occupant of the Premises holds over, as a result of which Landlord cannot
acquire possession of the Premises sufficiently in advance of the target
Commencement Date to allow for completion of the Tenant's Work, or if for any
other reason the Premises have not been Substantially Completed by the target
Commencement Date, Landlord shall not be deemed to be in default hereunder or
have any liability to Tenant for any resulting loss, damage or inconvenience;
nor shall this Lease be void or voidable. Tenant agrees to accept possession of
the Premises at such time as Landlord is able to tender the same, and on such
date Tenant shall be deemed to have accepted the same as suitable for the
purposes herein intended and to have acknowledged that the same comply fully
with Landlord's obligations. Tenant agrees to give Landlord a document
confirming the Commencement Date and certifying that Tenant has accepted
delivery of the Premises and that the condition of the Premises complies with
Landlord's obligations hereunder. Such document shall be in the form attached
hereto as Exhibit "B", by this reference incorporated herein. The failure of
Landlord to request the execution of such agreement, or Tenant's failure to
execute such agreement, shall not affect the determination of the Commencement
Date.

                                       2
<PAGE>

3.0  Rent.

     3.1  Tenant agrees to pay to Landlord in advance on or before the first
day of each month the Base Rent, subject to adjustment as hereinafter provided,
without demand, deduction or set off, for each month of the entire Lease Term.
One such monthly installment ("Installment") together with the Security Deposit
shall be due and payable by Tenant to Landlord in accordance with paragraph 3.3
hereof, and a like monthly installment shall be due and payable without demand
on or before the first day of each calendar month succeeding the Commencement
Date during the Lease Term. Base Rent for any period of less than a full month
shall be prorated, based on one-thirtieth (1/30) of the current monthly Base
Rent for each day of the partial month this Lease is in effect.

     3.2  If any installment of the Base Rent, or any other sums which become
owing by Tenant to Landlord under the provisions hereof, is not received within
five (5) days after the due date thereof, without in any way implying Landlord's
consent to such late payment, Tenant, to the extent permitted by law, agrees to
pay, in addition to said installment of the Base Rent or such other sum owed, a
late payment charge equal to ten percent (10%) of the installment of the Base
Rent or such other sums owed, it being understood that said late payment charge
shall constitute liquidated damages and shall be for the purpose of reimbursing
Landlord for additional costs and expenses which Landlord presently expects to
incur in connection with the handling and processing of late installment
payments of the Base Rent and such other sums which become owing by Tenant to
Landlord hereunder. Landlord and Tenant expressly covenant and agree that in the
event of any such late payment by Tenant, the damages so resulting to Landlord
will be difficult to ascertain precisely, and that the foregoing charge
constitutes a reasonable and good faith estimate by the parties of the extent of
such damages and does not constitute interest. Notwithstanding the foregoing,
the foregoing late charges shall not apply to any sums which may have been
advanced by Landlord to or for the benefit of Tenant pursuant to the provisions
of this Lease.

     3.3  Tenant shall pay the Security Deposit and the Installment as soon as
practicable, but in no event later than August 1, 1997; a failure to pay the
Security Deposit and the Installment on or before August 1, 1997 shall
constitute an event of material default hereunder.  Furthermore, notwithstanding
anything to the contrary contained herein, Landlord shall have no obligation to
enter into any contracts with any contractor to perform the Tenant Work unless
and until Landlord has received the Security Deposit and the Installment, and
any delays caused to the Tenant Work by such non-receipt of the Security Deposit
and the Installment shall be Tenant Delay. The Security Deposit shall be held by
Landlord as security for the performance by Tenant of Tenant's covenants and
obligations under this Lease, it being expressly understood that such deposit
shall not be considered an advance payment of rent or a measure of Landlord's
damages in case of default by Tenant. Upon the occurrence of any event of
default by Tenant, Landlord may (but shall not be obligated to), from time to
time, without prejudice to any other remedy, apply the Security Deposit to any
arrearage of Rent or to any other damage, injury, expense or liability caused to
Landlord by such event of default. Following any such application of the
Security Deposit, Tenant shall pay to Landlord on demand the amount so applied
to restore the Security Deposit to its original amount. If Tenant is not then in
default hereunder, any remaining balance of the Security Deposit shall be
returned by Landlord to Tenant within thirty (30) days after the expiration of
this Lease. If Landlord transfers its interest in the Premises during the Lease
Term, Landlord may assign the Security Deposit to the transferee and thereafter
shall have no further liability for the return of the Security Deposit.

     3.4  All sums other than Base Rent payable by Tenant to Landlord under any
provision of this Lease, including without limitation the amounts due by Tenant
pursuant to Article 4 below, shall continue "Additional Rent." Base Rent and
Additional Rent are herein referred to collectively as "Rent". All Rent due
hereunder shall bear interest from the due date until paid in full at a rate
equal to the lesser of: (a) the prime interest rate in effect from day to day at
NationsBank of Georgia, plus three (3) percentage points; or (b) the maximum
legal rate allowed by law (the "Default Rate"). If more than the maximum legal
rate of interest should ever be collected with regard to any sum due hereunder,
said excess amount shall be credited against future payments of Rent thereafter
first accruing hereunder. If no such further Rent accrues hereunder, said excess
sums shall be promptly refunded by Landlord to Tenant upon written demand by
Tenant.

     3.5  No payment by Tenant or receipt by Landlord of a lesser amount than
the correct Rent shall be deemed to be other than a payment on account, nor
shall any endorsement or statement

                                       3
<PAGE>

or any check or any letter accompanying any check or payment be deemed an accord
and satisfaction. Landlord may accept such check or payment without prejudice to
Landlord's right to recover the balance or to pursue any other remedy in this
Lease or otherwise provided by law or equity.

4.0  Consumer Price Index Increases; Operating Costs Escalations.

     4.1  The Base Rent payable under Section 3.1 hereof is based upon the
Revised Consumer Price Index for Urban Wage Earners and Clerical Workers for
Atlanta, Georgia, U.S. Cities Average All Items (1982-1984 = 100) ("Consumer
Price Index") published by the Bureau of Labor Statistics, United States
Department of Labor. On the first January 1 occurring after the Commencement
Date, and on each January 1 thereafter during the Lease Term, the Base Rent
shall be increased by fifty percent (50%) of the percentage increase in the
Consumer Price Index over the Base Year. The increase in Base Rent shall be
determined as follows: (i) multiply the Base Rent for the calendar year
immediately preceding the January 1 in question (annualized if it was a partial
year) by a fraction, the numerator of which is the Consumer Price Index for the
month of December immediately prior to the January in question, and the
denominator of which is the Consumer Price Index for the month of December one
year and one month prior to the January in question; (ii) subtract from the
resulting product the Base Rent for the calendar year immediately prior to the
January 1 in question; (iii) multiply the remainder by 50%; and (iv) add the
resulting product to the Base Rent for the calendar year immediately prior to
the January 1 in question; however, in no event shall the Base Rent be less than
the amount of Base Rent due in the December immediately prior to such
adjustment. If the index for any December in question is not published as of the
effective date of adjustment, then Tenant shall continue to pay the existing
Base Rent due from Tenant until the index necessary to perform the calculations
described herein is published and Landlord is able to calculate the revised
amount of Base Rent due from Tenant. Upon the submission of such calculation
from Landlord, Tenant shall thereafter pay the adjusted Base Rent. Tenant shall
also pay within thirty (30) days after such calculations the difference between
what Tenant has paid in Base Rent for the year in question and what Tenant would
have paid, had the adjustment in question been made and Base Rent at the
adjusted rate paid as of January 1 of said year.

     4.2  If the Consumer Price Index as now published shall be revised or cease
to be compiled and published during the Lease Term, Landlord will substitute
therefor a comparable index based upon changes in the cost of living or
purchasing power of the consumer dollar published by any other U.S. government
agency or, if no such index is available, a comparable index published by a
major bank or other financial institution or by a recognized university or
financial publication.

     4.3  (a) In addition to Base Rent and increases Tenant is obligated to pay
pursuant to Section 4.1 above, Tenant agrees to pay as Additional Rent, Tenant's
Share of Operating Costs (as defined below) for each Lease Year during the Lease
Term to the extent the Operating Costs for such Lease Year exceed the Operating
Costs for the Building for the Base Year, on a per square foot per annum basis.
Commencing January 1 following the execution date of this Lease, estimated
monthly payments of Tenant's Share of Operating Costs shall be due and payable
without demand, deduction or set off in advance on or before the first day of
each month of the Lease Term. During any Lease Year within the Lease Term that
is less than twelve (12) full months, any amount to be paid with respect to
such period shall be proportionately adjusted based on that portion of the
Lease Year that this Lease is in effect.

         (b) On or before December 15 of each Lease Year, Landlord shall provide
Tenant with Landlord's estimate of Tenant's Share of Operating Costs for the
following Lease Year. Beginning on the January 1 of each Lease Year, the amount
of Tenant's Share of Operating Costs shall be adjusted to the amount set forth
in Landlord's estimate. As promptly as practicable after the end of each Lease
Year, Landlord shall compute the actual Operating Costs for the previous Lease
Year. If Tenant's Share of the actual Operating Costs is greater than the amount
Tenant paid to Landlord as the estimate of Tenant's Share of Operating Costs for
the previous Lease Year, Tenant shall, within fifteen (15) days after receipt of
notice of Tenant's Share of actual Operating Costs, pay to Landlord as
Additional Rent an amount equal to the difference between Tenant's Share of
actual Operating Costs and the estimate of Tenant's Share of Operating Costs. If
Tenant's Share of the actual Operating Costs for any Lease Year is less than the
amount Tenant paid to Landlord as the

                                       4
<PAGE>

estimate of Tenant's Share of Operating Costs for such Lease Year, such excess
amount shall be applied against the installment of Additional Rent next coming
due until the same has been fully applied.

        (c)  "Operating Costs" shall mean all costs paid by Landlord or its
representatives in connection with the ownership, management, maintenance,
operation, leasing, insuring, repairing, redecorating, cleaning and securing of
the Project, as determined by Landlord to be necessary or appropriate and
properly allocable to the Project, including, without limitation, all of the
following costs:

          (i) All wages, salaries, commissions and related expenses of all on-
site and off-site agents, employees and contractors engaged in the management,
operation, maintenance, repair, redecoration, cleaning, and security of the
Project, plus the costs of all management, maintenance, and security offices in
the Project.

          (ii) All supplies and materials used and labor charges incurred in the
management, operation, maintenance, repair, redecoration, cleaning and security
of the Project.

          (iii) All equipment purchased or leased for the performance of
Landlord's obligations hereunder.

          (iv) All management, maintenance, cleaning, security, advertising,
promotional and other service agreements for the Project and the equipment
therein, including, without limitation, alarm service, security service, window
cleaning, and elevator and escalator maintenance.

          (v) All accounting, legal and engineering fees and expenses,
including, without limitation, the cost of audits by certified public
accountants.

          (vi) All insurance premiums, including, without limitation, fire,
casualty, extended coverage, public liability, rent abatement, boiler, and
Worker's Compensation insurance applicable to the Project, Landlord's employees
and Landlord's personal property used in connection therewith.

          (vii) All redecorating (including painting, wall papering and floor
covering), maintaining and repairing of the Project, structural or
non-structural, including, without limitation, the mechanical, electrical,
heating, ventilating and air conditioning equipment, landscape maintenance and
the replacement of trees and shrubbery.

          (viii) All removing of trash, rubbish, garbage and other refuse from
the Project, as well as removal of ice and snow from the sidewalks, driveways
and parking lots.

          (ix)  All amortization of capital improvements (including accounting,
legal, architectural and engineering fees incurred in connection therewith) made
to the Project subsequent to the Commencement Date which: (i) will improve
operating efficiencies; (ii) are required to comply with, or to bring the
Project into compliance with any law (including, without limitation, ADA as
hereinafter defined); or (iii) improve or enhance the health of persons in the
Project or safety of the Project.

          (x) All charges for electricity, gas, water, sewer, and other
utilities furnished to or services or privileges made available to users of the
Project.

          (xi) All ad valorem property taxes covering all real and personal
property constituting a part of the Project, including, but not limited to, all
general and special assessments of every kind.

                                       5
<PAGE>

          (xii) All other expenses of owning, maintaining, operating, insuring.
securing, managing, cleaning, redecorating or repairing the Project.

Notwithstanding any of the foregoing to the contrary, Operating Costs shall not
include:

                (1)  Costs which are directly reimbursed to Landlord by other
      tenants.

                (2)  Payments on mortgages or ground leases owed by Landlord.

                (3)  Costs of leasehold improvements for which Landlord has
      agreed to pay.

                (4)  Payment of any return on equity to any owner of the
      Project.

                (5)  Costs reimbursed by proceeds of insurance.

                (6)  Costs of the initial construction of the Project or any
      depreciation thereof.

                (7)  Payments of claims, damages or expenses resulting from
      any willful misconduct of Landlord or any of its authorized
      representatives.

       (d) Notwithstanding anything to the contrary contained herein, if during
any full or partial calendar year constituting a portion of the term of this
Lease, less than one hundred percent (100%) of the total rentable area of the
Building is actually occupied, the calculation of Operating Costs for such full
or partial calendar year shall be adjusted to reflect Landlord's reasonable
estimate of Operating Costs had ninety-five percent (95%) of the Building been
occupied. Landlord and Tenant acknowledge that certain of the costs and expenses
of ownership, management, operation and maintenance of the Building and
supporting facilities are to be allocated entirely to the Building, while
certain of such costs are to be allocated between the Project and that certain
adjoining office building owned by Landlord and commonly known as Building 400
at The Pointe. The determination of such costs and their allocation shall be
made on an accrual basis and in accordance with generally accepted accounting
principles applied on a consistent basis.

5.0 Landlord's Obligations.

   5.1 Subject to the limitations hereinafter set forth, Landlord agrees to
furnish Tenant, while Tenant is occupying the Premises but is not in default
under this Lease, facilities to provide: (a) water at those points of supply
provided for general use of tenants of the Building; (b) heated and refrigerated
air conditioning in season, from 8:00 a.m. to 6:00 p.m. Monday through Friday
and from 8:00 a.m. to 1:00 p.m. on Saturdays, except for holidays, at such
temperatures and in such amounts as are reasonably considered by Landlord to be
standard; (c) janitorial services to the Premises on weekdays other than
holidays and such window washing as may from time to time, in the Landlord's
judgment, be reasonably required; and (d) operatorless passenger elevators for
ingress and egress to the floor on which the Premises are located, in common
with other tenants, provided that Landlord may reasonably limit the number of
elevators to be in operation at times other than during customary business hours
for the Building and on holidays. In addition, Landlord agrees to maintain the
public and common areas (the "Common Facilities") of the Building, such as
lobbies, stairs, corridors and restrooms, in reasonably good order and
condition, except for damage occasioned by Tenant, or its employees, agents or
invitees. If Tenant shall desire any of the services specified in this Section
5.1 on any days or at any time other than times herein designated, such service
or services shall be supplied to Tenant only at the written request of Tenant
delivered to Landlord before 3:00 p.m. on the business days preceding such extra
usage, and Tenant shall pay to Landlord as Additional Rent the cost of such
service(s) immediately upon receipt of a bill therefore.

    5.2  Without additional cost to Tenant, Landlord shall provide standard
electric lighting and current for Tenant's use and occupancy of the Premises and
shall make available electric lighting and current for the common areas of the
Building in the manner and to the extent deemed by Landlord to be standard. If
Tenant's use of electric current (a) exceeds 110 volt power, or (b) exceeds

                                       6
<PAGE>

that required for routine lighting and operation of general office machines
(such as typewriters, dictating equipment, copying machines, personal computers,
desk model adding machines and the like) which use 110 volt electrical power,
then Tenant shall pay on demand the cost (as determined in good faith by
Landlord) of any such excess electrical consumption. Without Landlord's prior
written consent, Tenant shall not install any data processing or computer
equipment (other than personal computers) in the Premises or any other equipment
which it shall require for its use other than the normal electrical current or
other utility service. Whenever heat generating machines or equipment (other
than general office machines as described hereinbefore) are used in the Premises
by Tenant which affect the temperature otherwise maintained by the air
conditioning system or otherwise overload any utility, Landlord shall have the
right to install supplemental air conditioning units or other supplemental
equipment in the Premises, and the cost thereof (as determined in good faith by
Landlord), including without limitation, the cost of installation, operation,
use and maintenance, shall be paid by Tenant to Landlord on demand. The rate
charged by Landlord shall not exceed the rate prevailing for Tenant as a user as
established by the applicable rate classification published from time to time by
the local electric power company or other utility supplier. The obligation of
the Landlord hereunder to make available such utilities shall be subject to the
rules and regulations of the supplier of such utilities and of any municipal or
other governmental authority regulating the business of providing such utility
service. Tenant will be billed monthly for such additional utility service and
all such charges shall be considered due upon delivery of such bill and be
deemed to be Additional Rent due from Tenant to Landlord.

   5.3 Landlord shall not in any way be liable or responsible to Tenant for any
loss or damages or expense which Tenant may sustain or incur if either the
quantity or character of any utility service is changed or is no longer
available or is no longer suitable for Tenant's requirements. Tenant covenants
and agrees that at all times its use of electric current shall never exceed the
capacity of existing feeders to the Building or the risers or wiring
installations. Any riser or risers or wiring required or necessary to meet
Tenant's excess electrical requirements upon written request of Tenant will be
installed by Landlord at the sole cost and expense of Tenant (if, in Landlord's
sole judgment, the same are necessary and will not cause permanent damage or
injury to the Building or the Premises or cause or create a dangerous or
hazardous condition or entail excessive or unreasonable alterations, repairs or
expense or interfere with or disturb other tenants or occupants). At any time
when Landlord is making such additional utility service available to the
Premises pursuant to this Section, Landlord may, at its option, upon not less
than thirty (30) days' prior written notice to Tenant, discontinue the
availability of such additional utility service. If Landlord gives any such
notice of discontinuancy, Landlord shall make all the necessary arrangements
with the public utility supplying the utilities to the Premises with respect to
obtaining such additional utility service to the Premises, but Tenant will
contract directly with such public utility for the supplying of such additional
utility service to the Premises.

   5.4  Failure to any extent to make available, or any slow-down, stoppage or
interruption of, these defined services resulting from any cause (including, but
not limited to, Landlord's compliance with (a) any voluntary or similar
governmental or business guideline now or hereafter published or (b) any
requirements now or hereafter established by any governmental agency, board or
bureau having jurisdiction over the operation and maintenance of the Building)
shall not render Landlord liable in any respect for damages to either person,
property, or business, nor be construed as an eviction of the Tenant or work an
abatement of Rent, nor relieve Tenant from fulfillment of any covenant or
agreement in this Lease. Should any equipment or machinery furnished by Landlord
break down or for any cause cease to function properly, Landlord shall use
reasonable diligence to repair same promptly, but Tenant shall have no claim for
abatement of rent or damages on account of any interruptions in service
occasioned thereby or resulting therefrom.

   5.5  Tenant's obligations to pay any and all Additional Rent pursuant to this
Section 5.0 shall continue and shall cover all periods up to the actual date of
expiration or termination of this Lease; provided, however, if Landlord
terminates this Lease without waiving Landlord's right to seek damages against
Tenant. Tenant's obligation to pay any and all Additional Rent pursuant to this
Section 5.0 shall not terminate as a result thereof.

                                       7
<PAGE>

6.0  Tenant Improvements.

    6.1 Landlord and Tenant have reviewed and approved that certain preliminary
space plan dated June 26, 1997 ("Preliminary Plans"), prepared by The Hauseman
Group ("Architect"). As soon as reasonably possible following the execution and
delivery of this Lease by both parties, Landlord shall cause its Architect to
prepare detailed design plans, specifications and working drawings, designated
as being ready for construction ("Construction Documents"). The Construction
Documents shall include, but not be limited to, the location of all interior
partitions, doors, electrical switches and outlets and telephone outlets;
reflected ceiling plan showing the location of all lights, fans, diffusers, and
vents; electrical plumbing and mechanical plans; floor and wall coverings; and
signs. During the preparation of the Construction Documents, Tenant shall supply
the Architect, within five (5) business days following written request therefor,
with any information necessary for the completion of the Construction Documents.
Upon completion of the Construction Documents, Landlord shall deliver the
Construction Documents to Tenant for approval, which approval may not be
withheld by Tenant so long as the Construction Documents are substantially in
accordance with the Preliminary Plans. Tenant's approval or disapproval must be
provided, in writing, within five (5) business days of Tenant's receipt of the
Construction Documents. If Tenant validly disapproves the Construction
Documents, Landlord will cause the Architect to revise the Construction
Documents and will resubmit the Construction Documents to Tenant for approval or
disapproval, which must be provided by Tenant within five (5) business days. If
Landlord and Tenant have a dispute about whether the Construction Documents are
substantially in accordance with the Preliminary Plans, the parties agree to
submit the dispute to an independent third-party architect for resolution. The
parties agree that the decision of the third-party architect shall be final and
binding on the parties.

    6.2 Promptly upon the completion and approval of the Construction
Documents, Landlord shall submit the Construction Documents to three (3)
contractors for bid. Upon receipt of the bids from the contractors, Landlord
shall select the lowest conforming bid and shall enter into a guaranteed maximum
price contract with that contractor ("Contractor") to perform the Tenant Work
(as defined below). Landlord will provide Tenant a copy of the Contractor's
bids. Tenant may, within two (2) business days of its receipt of such bid,
request changes to the Construction Documents, but any delay caused by such
request for changes shall be a Tenant Delay.

    6.3 Promptly after Landlord enters into a contract ("Construction Contract")
with the Contractor and Tenant pays to Landlord the Cost Differential (as
defined below), if any, Landlord shall cause construction of all the work shown
on the Construction Documents ("Tenant's Work") to be commenced. Landlord shall
use all reasonable efforts to cause Tenant's Work to be completed substantially
in accordance with the Construction Documents by the target Commencement Date
set forth in Section 1.7, subject, however, to extension for delays caused by
Tenant Delay (as defined below) or by any of the following events: acts of God;
weather of unusual severity; fire; earthquake; flood; explosion; action of the
elements; malicious mischief; inability to procure or general shortage of labor;
services, material, equipment, facilities or supplies; strikes; lockouts;
actions of labor unions; or any other cause, whether similar or dissimilar to
the foregoing, not within the reasonable control of Landlord (all of the
foregoing collectively being referred as "unavoidable delays").

   6.4 Tenant hereby appoints the individual named in Section 1.17 hereof as
Tenant's Designated Representative for purposes of dealing with Landlord with
respect to all matters involving, directly or indirectly, the Construction
Documents or Tenant's Work including, without limitation, change orders to the
Construction Documents. Tenant hereby warrants and represents to Landlord that
Tenant's Designated Representative has all of the requisite power and authority
to deal with Landlord in the manner contemplated herein and that Tenant shall be
bound by the acts and omissions of Tenant's designated representative.

   6.5 Landlord shall provide Tenant with an amount up to, but not to exceed,
the amount specified as Tenant's Allowance in Section 1.16 hereof to apply
toward the design, construction and installation of Tenant's Work within the
Premises. Tenant shall be responsible for all costs related to Tenant's Work
("Costs of Tenant's Work") that are in excess of Tenant's Allowance, including,
without limitation, (i) all costs to prepare the Construction Documents, (ii)
all costs required to be paid under the Construction Contract, (iii) all permit
fees and costs and (iv) a construction supervision fee payable to LaSalle (as
defined in Paragraph 25) in an amount equal to five percent (5%)

                                       8
<PAGE>

of the total price under the Construction Contract. If the Cost of Tenant's Work
exceeds Tenant's Allowance, Landlord will invoice Tenant for such excess ("Cost
Differential"), prior to beginning Tenant's Work and Tenant shall pay Cost
Differential to Landlord within two (2) business days thereafter. Landlord will
then disburse payments directly to the Architect, Contractor and LaSalle. Any
unused portion of Tenant's Allowance shall be retained by Landlord, and Tenant
shall have no interest therein.

   6.6 Upon Substantial Completion of Tenant's Work in accordance with the
Construction Documents, Landlord shall furnish Tenant written notice of
Substantial Completion and shall deliver possession of the Premises to Tenant.
The term "Substantial Completion" shall mean the date that (i) a certificate of
occupancy has been issued for the Premises and (ii) the Architect certifies, in
writing, that Tenant's Work has been completed substantially in accordance with
the Construction Documents, except for punchlist items (as defined and described
in Section 6.7 below). Within five (5) calendar days after Tenant's receipt of
such written notice from Landlord, Tenant shall execute and deliver to Landlord
the certificate attached to this Lease as Exhibit B.

    6.7 Within five (5) days after the date of notice of Substantial Completion
referred to in Section 6.6, Landlord and Tenant's designated representative
shall jointly inspect the Premises for the purposes of determining whether any
additional or corrective work is needed in order for Tenant's Work to
substantially comply with the Construction Documents (such additional or
corrective work being hereinafter referred to as the "punchlist items").
Landlord shall be responsible for causing the punchlist items to be completed or
corrected as expeditiously as reasonably practicable, but in any event within
thirty (30) days after the date of notice of Substantial Completion, subject,
however, to extensions of such thirty (30) days period resulting from
unavoidable delays. Substantial Completion of the Premises shall be deemed to
have occurred so long as any punchlist item does not prevent Tenant from
beneficially occupying substantially all of the Premises for the purposes set
forth in this Lease without material disruption.

   6.8 After commencement of Tenant's Work by Landlord, any changes to the
Construction Documents and the cost arising from such changes (either deductive
or additional), shall be mutually agreed upon in writing by both Landlord and
Tenant, and the Cost of Tenant's Work shall be adjusted accordingly. If any
change results in an increase in the Cost of Tenant's Work, Tenant shall pay the
amount of such increase to Landlord simultaneously with the approval of such
change by both Landlord and Tenant and Landlord shall not be obligated to make
the change unless Tenant makes the advance payment. In the event that, in
Landlord's opinion, any change will delay Substantial Completion of Tenant's
Work, such delay will be a Tenant Delay (as defined in Section 6.9 below).

   6.9 The Term "Tenant Delay" shall mean each day that Substantial Completion
of Tenant's Work is delayed by any act or omission of Tenant, including, but
not limited to the following:

       (a) Tenant's failure to respond, within the prescribed time periods, to a
request for information necessary for the completion of the Construction
Documents;

       (b) Tenant's failure to approve or disapprove the Construction Documents
(or any revision thereto) within the prescribed time periods;

       (c) Tenant's request for change order; and

       (d) Any interference by Tenant with the performance of Tenant's Work.

   The date that Substantial Completion actually occurs will be moved back
for all purposes of this Lease (including, without limitation, for determination
of the Commencement Date), on a day-for-day basis for each day of Tenant Delay.
For example, if Substantial Completion actually occurs on December 15 but there
were fifteen (15) days of Tenant Delay, Substantial Completion (and thus the
Commencement Date) will be deemed to occur on December 1.

7.0 Permitted Use. Tenant shall use the Premises only for the Permitted Use.
Tenant will not occupy or use the Premises, or permit any portion of the
Premises to be occupied or used, for any

                                       9
<PAGE>

business or purpose other than the Permitted Use or for any use or purpose which
is unlawful in part or in whole or deemed to be disreputable in any manner or
extra hazardous on account of fire, nor shall Tenant use, store or discharge
any "Hazardous Material" as defined in Section 46.0 hereof, nor permit anything
to be done which will in any way increase the rate of insurance on the Building
or contents; and in the event that, by reasons of acts of the Tenant, there
shall be any increase in the rate of insurance on the Building or contents
created by Tenant's acts or conduct of business, then such acts of Tenant shall
be deemed to be an event of default hereunder and Tenant hereby agrees to pay to
Landlord the amount of such increase on demand, and acceptance of such payment
shall not constitute a waiver of any of Landlord's other rights provided herein.
Tenant will conduct its business and control its agents, employees and invitees
in such a manner as not to create any nuisance, nor interfere with, annoy or
disturb other tenants or Landlord in the management of the Building. Tenant will
maintain the Premises in a clean, healthful and safe condition and will comply,
at Tenant's expense, with all laws, ordinances, orders, rules and regulations
(state, federal, municipal and other agencies of bodies having jurisdiction
thereof) with reference to the use, condition or occupancy of the Premises,
including, without limitation, ADA. Tenant will not, without the prior written
consent of the Landlord, paint, install lighting or decorations, or install any
signs, window or door lettering or advertising media of any type on or about the
Premises or any part thereof.

8.0  Tenant's Repairs and Alterations.

    8.1 Tenant will not in any manner deface or injure the Building, and will
pay the cost of repairing any damage or injury done to the Building or any part
thereof by Tenant or Tenant's agents, employees or invitees. Tenant shall take
good care of the Premises throughout the Lease Term and keep them free from
waste and nuisance of any kind. Tenant agrees to keep the Premises, including
all fixtures installed by Tenant, in good condition, and to make all necessary
non-structural repairs except those caused by fire, casualty or acts of God
covered by Landlord's insurance policy covering the Building (if any). The
performance by Tenant of its obligations to maintain and make repairs shall be
conducted only by contractors and subcontractors approved by Landlord, and
Tenant shall procure and maintain and shall cause such contractors and
subcontractors engaged by or on behalf of Tenant to procure and maintain
insurance coverage against such risks, in such amounts and with such companies
as Landlord requires in connection with such maintenance and repair. Tenant
shall prohibit any contractor it engages or subcontractor or material suppliers
engaged through such contractor from filing any notice or notices of
commencement of public record as a part of or in connection with any work on the
Premises. Tenant hereby further convenants and agrees to provide Landlord with
copies of any notices Tenant may receive in connection with any such work.

    8.2 If Tenant fails to make the repairs described above within fifteen (15)
days after the occurrence of the damage or injury, Landlord may at its option
make such repair; and upon demand therefor, Tenant shall pay Landlord for the
cost thereof. At the end or other termination of this Lease, Tenant shall
deliver the Premises with all improvements located thereon (except as otherwise
herein provided) in good repair and condition, reasonable wear and tear
excepted, and shall deliver to Landlord all keys to the Premises. Tenant will
not make or allow to be made any alterations or physical additions in or to the
Premises without the prior written consent of the Landlord. All alternations,
additions or improvements (whether temporary or permanent in character) made in
or upon the Premises by Landlord or Tenant shall be Landlord's property on
termination or expiration of this Lease and shall remain on the Premises without
compensation to Tenant, provided that Landlord, at its option, may by notice to
Tenant, require Tenant to remove any such alternations, additions or
improvements at Tenant's cost and to restore the Premises to the condition of
the Premises at the Commencement Date, normal wear and tear excepted. All
furniture, movable trade fixtures and equipment installed by Tenant may be
removed by Tenant at the termination of this Lease if Tenant so elects, and
shall be so removed if required by Landlord, or if not so removed shall, at the
option of Landlord, become the property of Landlord. All such installations,
removals and restoration shall be accomplished in a good workmanlike manner so
as not to damage the Premises or the primary structure or structural qualities
of the Building or the plumbing, electrical lines or other utilities.

9.0  Subletting and Assigning.

   9.1 Tenant shall not assign, mortgage or encumber this Lease, nor sublet,
suffer or permit the Premises or any part thereof to be used by others, without
the prior written consent of Landlord

                                       10
<PAGE>

in each instance. If this Lease be assigned, or if the Premises or any part
hereof be sublet or occupied by anyone other than Tenant, without Landlord's
prior written consent, Landlord may collect from the assignee, subtenant or
occupant, and apply the net amount collected to the Rent, but no such
assignment, subletting, occupancy or collection shall be deemed a waiver of this
covenant, or the acceptance of the assignee, subtenant or tenant, of a release
of Tenant from the further performance of its covenants herein contained. The
consent by Landlord to an assignment or subletting shall not be construed to
relieve Tenant from obtaining Landlord's written consent to any further
assignment or subletting. Should Tenant desire to assign this Lease or any right
or interest herein or sublet the Premises or any part thereof, Tenant shall give
Landlord written notice of such desire, which notice shall contain (1) the name
and address of the proposed assignee or subtenant and its form of organization,
(2) the nature of the proposed assignee or subtenant's business to be conducted
in the Premises, (3) the terms and conditions of the proposed assignment or
sublease, and (4) financial statements for the three most recent completed
fiscal years of the proposed assignee or subtenant and such other financial
information as Landlord may request and a bank reference, together with a
written request that Landlord approve such assignment or subletting. Together
with the delivery of said notice, Tenant also shall pay to Landlord an
administrative processing fee in the amount of $500.00, which fee shall be
nonrefundable in any event, regardless of whether Landlord approves the proposed
assignment or sublease (but also fully applicable to Landlord's costs and
expenses incurred in reviewing said request, including, without limitation,
attorney's fees).

     9.2  (a) For the purposes of this Lease, an "assignment" prohibited by this
Section 9.0 shall be deemed to include the following: if Tenant is a partnership
or limited liability company, a withdrawal or change (voluntary, involuntary, by
operation of law) of any one or more of the general partners or manager thereof,
or the dissolution of the partnership or limited liability company; or, if
Tenant consists of more than one person, a purported assignment, transfer,
mortgage or encumbrance (voluntary, involuntary, by operation of law or
otherwise) from one constituent member to any other constituent member, or to
any third party, or, if Tenant is a corporation, any dissolution, merger,
consolidation or other reorganization of Tenant, or any change in the ownership
(voluntary, involuntary, by operation of law, creation of new stock or
otherwise) of fifty percent (50%) or more of its capital stock from the
ownership existing on the date of execution hereof, or, the sale of fifty
percent (50%) of the value of the assets of Tenant.

          (b) Notwithstanding the foregoing, without Landlord's consent, but
upon ten (10) days' prior written notice to Landlord, this Lease may be
assigned, or the Premises may be sublet (i) to any corporation or other legal
entity which is a parent, subsidiary or affiliate of Tenant, (ii) to any
successor entity resulting from the initial public offering of the Tenant stock,
or (iii) by virtue of a merger into, stock sale to or sale of substantially all
of Tenant's assets to, any public corporation whose stock is traded on a major
national or international stock exchange and whose demonstrated net worth is not
less than One Million U.S. Dollars (U.S.$1,000,000); provided that both Tenant
and the parent, subsidiary, affiliate or successor entity to whom Tenant assigns
the Lease shall be jointly and severally liable for all of Tenant's obligations
and liabilities under this Lease whether arising before or after the date of
assignment, and further provided that in the event of such an assignment
described in this paragraph 9.2(b), any such assignee shall have a net worth as
determined in accordance with generally accepted accounting principles
consistently applied that is at least equal to the net worth of Tenant
(determined in a similar manner) on the date of execution of this Lease. For the
purpose of this Section, a "parent" shall mean a corporation or other legal
entity which owns not less than one hundred percent (100%) of the outstanding
voting interests in Tenant, a "subsidiary" shall mean any entity not less than
one hundred percent (100%) of whose outstanding voting interests shall be owned
by Tenant, and an "affiliate" shall mean any entity not less than one hundred
percent (100%) of whose outstanding voting interests shall be owned by Tenant's
parent.

     9.3 No less than thirty (30) days prior to the effective date of a proposed
assignment or sublease [other than one made pursuant to Subsection 9.2(b)],
Tenant shall offer to reconvey to Landlord, as of said effective date, that
portion of the Premises which Tenant is seeking to assign or sublet, which offer
shall contain an undertaking by Tenant to accept, as full and adequate
consideration for the reconveyance, Landlord's release of Tenant from all future
Rent and other obligations under this Lease with respect to the Premises or the
portion thereof so reconveyed. Landlord, in its absolute discretion, shall
accept or reject the offered reconveyance within ten (10) business days of the
offer and if Landlord accepts, the reconveyance shall be evidenced by an

                                       11
<PAGE>

agreement acceptable to Landlord in form and substance. If Landlord fails to
accept or reject the offer within the ten (10) business day period, Landlord
shall be deemed to have rejected the offer.

   9.4 If Landlord rejects or is deemed to have rejected Tenant's offer of
reconveyance and if Landlord gives its consent to any assignment of this Lease
or to any sublease, or if Tenant is otherwise permitted to make any assignment
or sublease pursuant to this Lease, Tenant shall in consideration therefore, pay
to Landlord, as Additional Rent the amounts described in subparagraphs (a) and
(b) below. The sums due under subparagraphs (a) and (b) below shall be paid by
Tenant to Landlord as and when payable by the assignee or subtenant to Tenant:

       (a) In the case of an assignment, an amount equal to all sums and
consideration paid to Tenant by the assignee for or by reason of such assignment
(including any sums paid for the sale, rental, or use of Tenant's Property (as
hereinafter defined in Section 17) in excess of the then unamortized value of
Tenant's Property as reflected in Tenant's federal income tax returns less the
reasonable brokerage commissions and legal fees, if any, actually paid by Tenant
in connection with such assignment; and

       (b) In the case of a sublease, any rents, additional charge or other
consideration payable under the sublease to Tenant by the subtenant (including
any sums paid for the sale, rental or use of Tenant's Property in excess of the
then unamortized value of Tenant's Property as reflected in Tenant's federal
income tax returns) that are in excess of the Rent during the term of the
sublease with respect to the subleased space, less the reasonable brokerage
commissions and legal fees, if any, actually paid by Tenant in connection with
such subletting.

   9.5 Tenant shall reimburse Landlord on demand for any reasonable costs that
Landlord may incur in connection with a request by Tenant to consent to any
assignment or sublease, including the reasonable costs of investigating the
acceptability of the proposed assignee or subtenant, and reasonable legal costs
incurred in connection with the granting of any requested consent and in
negotiating and documenting any sublease or assignment.

   9.6 No assignment or subletting shall affect the continuing primary liability
of Tenant (which, following assignment, shall be joint and several with the
assignee), and Tenant shall not be released from performing any of the terms,
covenants and conditions of this Lease.

10.0 Indemnity. Landlord shall not be liable for and Tenant will indemnify and
save harmless Landlord of and from all fines, suits, demands, damages, losses
and actions (including, without limitation, attorney's fees) for any injury to
person or damage to or loss of property: (i) occurring in the Premises, unless
caused by the willful misconduct of Landlord, its agents or employees; (ii)
caused in whole or in part by the negligence or misconduct of, or breach of the
Lease by Tenant, its employees, subtenants, invitees or by any other person
entering the Premises or the Building under express or implied invitation of
Tenant; or (iii) arising out of Tenant's use of the Premises. Landlord shall not
be liable or responsible for any loss or damage to any property or death or
injury to any person occasioned by theft, fire, act of God, public enemy,
criminal conduct of third parties, injunction, riot, strike, insurrection, war,
court order, requisition of other governmental body or authority, by other
tenants of the Building or any other matter, or for any injury or damage or
inconvenience which may arise through repair or alteration of any part of the
Building, or failure to make repairs, or from any cause whatever except the
gross negligence or willful misconduct of Landlord, its agents or employees.

11.0 Subordination and Mortgagee's Right to Cure Landlord's Defaults.

   11.1  This Lease and all rights of Tenant hereunder are subject and
subordinate to any deeds to secure debt, mortgages or any other instruments of
security, as well as to any ground leases or primary leases, that now or
hereafter cover all or any part of the Building, the land situated beneath the
Building or any interest of Landlord therein, and to any and all advances made
on the security thereof, and to any and all increases, renewals, modifications,
consolidations, replacements and extensions of any such deeds to secure debt,
mortgages, instruments of security or leases. This provision shall be self-
operative and no further instrument shall be required to effect such
subordination of this Lease. Tenant shall, however, upon demand at any time or
times execute, acknowledge and deliver to Landlord any and all instruments and
certificates that in the judgement

                                       12
<PAGE>

of Landlord or its lender may be necessary or proper to confirm or evidence such
subordination. Notwithstanding the generality of the foregoing provisions of
this Section 11.0, Tenant agrees that any such mortgagee shall have the right at
any time to subordinate any such deeds to secure debt, mortgages or any other
instruments of security to this Lease on such terms and subject to such
conditions as such mortgagee may deem appropriate in its discretion. Tenant
further covenants and agrees upon demand by Landlord's mortgagee at any time,
before or after the institution of any proceedings for the foreclosure of any
such deeds to secure debt, mortgages or other instruments of security, or sale
of the Building pursuant to any such deeds to secure debt, mortgages or other
instruments of security, to attorn to such purchaser upon any such sale and to
recognize such purchaser as Landlord under this Lease. The agreement of Tenant
to attorn upon demand of Landlord's mortgagee contained in the immediately
preceding sentence shall survive any such foreclosure sale. Tenant shall upon
demand at any time or times before or after any such foreclosure sale, execute,
acknowledge and deliver to Landlord's mortgagee any and all instruments and
certificates that in the judgment of Landlord's mortgagee may be necessary or
proper to confirm or evidence such attornment, and Tenant hereby irrevocably
appoints Landlord's mortgagee as Tenant's agent and attorney-in-fact for the
purpose of executing, acknowledging and delivering any such instruments and
certificates.

    11.2 Notwithstanding anything contained herein to the contrary, Tenant
shall not terminate this Lease, assert any claim for damages against the
Landlord, assert any right of set-off against the Rent or exercise any other
rights or remedies provided under the Lease or arising at law or in equity,
because of a breach or default by Landlord under this Lease, without first
giving to any mortgagee, from time to time, of the property of which the
Premises is part, written notice of and the right, but not the obligation, for a
reasonable time, not to exceed sixty (60) days, to cure such breach or default,
provided Tenant has been notified in writing of the name and address of such
mortgagee.

12.0 Rules and Regulations. Tenant and Tenant's agents, employees and invitees
will comply fully with all requirements of the rules and regulations of the
Building and related facilities which are attached hereto as Exhibit "C", and
made a part hereof as though fully set forth herein. Landlord in its sole
judgement shall it all times have the right to change such rules and regulations
or to promulgate other rules and regulations in such manner as may be deemed
advisable for safety, care, or cleanliness of the Building and related
facilities or premises, and for preservation of good order therein, all of which
rules and regulations, changes and amendments will be forwarded to Tenant in
writing and shall be carried out and observed by Tenant. Tenant shall further be
responsible for the compliance with such rules and regulations by the employees,
servants, agents, visitors and invitees of Tenant.

13.0 Inspection. Landlord or its officers, agents, and representatives shall
have the right to enter into and upon any and all parts of the Premises at all
reasonable hours (or, in any emergency, at any hour) to (i) inspect same or
clean or make repairs or alterations or additions as Landlord may deem necessary
(but without any obligation to do so, except as expressly provided for herein)
or (ii) show the Premises to prospective tenants, purchasers or lenders; and
Tenant shall not be entitled to any abatement or reduction of Rent by reason
thereof, nor shall any such entry be deemed to be an actual or constructive
eviction.

14.0 Condemnation. If the Premises, or any part thereof, or if any material
portion of the Building shall be taken or condemned for public purposes, or sold
in lieu of condemnation, then the Lease Term shall, at the sole option of
Landlord, cease and terminate. If Landlord does not elect to terminate this
Lease following any such condemnation, Landlord shall restore the Building and
Project to an integrated whole as soon as reasonably practicable following such
condemnation, but Landlord shall not be obligated to spend in excess of any
condemnation award actually received by Landlord as a result of such
condemnation. All compensation awarded for any taking (or sale proceeds in lieu
thereof) shall be the property of Landlord, and Tenant shall have no claim
thereto, the same being hereby expressly waived by Tenant.

15.0 Fire or Other Casualty. If the Building is totally destroyed by fire,
tornado or other casualty or if the Premises or the Building should be so
damaged that rebuilding or repairs cannot be completed within one hundred eighty
(180) days after the date of such damage, Landlord may at its option terminate
this Lease by written notice to Tenant, in which event the Rent shall be abated

                                       13
<PAGE>

during the unexpired portion of this Lease effective from the date of such
damage. If the Building or the Premises are damaged by fire, tornado or other
casualty covered by Landlord's insurance, but only to such extent that
rebuilding or repairs can be completed within one hundred eighty (180) days
after the date of such damage, or if the damage should be more serious but
Landlord does not elect to terminate this Lease, in either such event Landlord
shall commence rebuilding or repairing within ninety (90) days after the date of
such damage and shall proceed with reasonable diligence to restore the Building
and/or Premises to not less than substantially the same condition in which it
was immediately prior to the related casualty, and from the date of such
casualty until the date Landlord has completed such restoration, Rent shall
abate in such proportion as the Premises have been made untenantable. If
Landlord elects to rebuild or repair the Building and/or Premises as provided
herein, but Landlord fails to substantially complete said restoration or repair
within twelve (12) months after the date of such damage, Tenant shall have the
right to terminate this Lease upon ten (10) days' prior written notice thereof
to Landlord. Landlord shall not be required, however, to rebuild, repair or
replace any part of the furniture, equipment, fixtures and other improvements
which may have been placed by Tenant or other tenants within the Building on the
Premises. There shall be a fair diminution of Rent during the time the Premises
are unfit for occupancy. If, following casualty of any magnitude, any mortgagee
under a deed to secure debt, security agreement or mortgage on the Building
should require that the insurance proceeds be used to retire the mortgage debt,
Landlord shall have no obligation to rebuild and this Lease shall terminate upon
notice to Tenant. Except as hereinafter provided, any insurance which may be
carried by Landlord or Tenant against loss or damage to the Building or to the
Premises shall be for the sole benefit of the party carrying such insurance and
under its sole control.

16.0 Holding Over. If Tenant remains in possession of the Premises, or any part
thereof, after the expiration or any earlier termination of the Lease Term,
without the execution of a new Lease between Landlord and Tenant, but with the
acquiescence of Landlord, Tenant shall be deemed to be occupying the Premises
under a month-to-month tenancy at a daily rental equal to the daily Rent payable
for the last month of the Lease Term multiplied by (a) one and one half (1 1/2)
during the first (1st) month of the holdover and (b) two (2) during each month
thereafter, and otherwise subject to all of the terms and conditions of this
Lease to the extent the same are applicable to a month-to-month periodic
tenancy. Landlord and Tenant agree that such periodic tenancy may be terminated
by either party upon thirty (30) days prior written notice to the other. The
inclusion of the preceding sentences shall not be construed as Landlord's
consent for Tenant to hold over. If Tenant remains in possession after
termination or expiration of this Lease without the consent or acquiescence of
Landlord, Tenant shall be deemed to be a tenant at sufferance only, and may be
evicted at once without notice. In no event shall there be any renewal of this
Lease by operation of law or otherwise.

17.0 Taxes on Tenant's Property. Tenant shall be liable for all taxes levied or
assessed against personal property, furniture or fixtures placed by Tenant in
the Premises (herein called "Tenant's Property"). If any such taxes for which
Tenant is liable are levied or assessed against Landlord or Landlord's property
and if Landlord elects to pay the same or if the assessed value of Landlord's
property is by inclusion of personal property, furniture or fixtures placed by
Tenant in the Premises, and Landlord elects to pay the taxes based on such
increase, Tenant shall pay to Landlord upon demand that part of such taxes for
which Tenant is primarily liable hereunder.

18.0 Events of Default. The following shall be events of default by Tenant under
this Lease:

    18.1 Tenant shall fail to pay when due any Rent or other sums payable by
Tenant hereunder (or under any other lease now or hereafter executed by Tenant
in connection with space in the Building) within ten (10) calendar days
following the date Tenant receives written notice thereof from Landlord;
provided however, that Landlord shall not be required to give any such notice of
non-payment more than one (1) time in any consecutive 12-month period, and for
the second (2nd) such non-payment, it shall be an event of default if such
payment is not received by Landlord when due.

    18.2 Tenant shall fail to comply with or observe any other provision of this
Lease (or any other lease now or hereafter executed by Tenant in connection with
space in the Building), and shall not cure such nonmonetary failure within
thirty (30) days following written notice from Landlord; provided, however, that
notwithstanding anything to the contrary contained herein, no cure periods

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<PAGE>

of any kind shall apply to non-monetary defaults of Tenant which pose a health
or safety hazard to any tenants, occupants, invitees or any other persons in the
Premises, the Building or the Project, or which interfere with the quiet
enjoyment of the other tenants of the Project.

   18.3 Tenant or any guarantor of Tenant's obligations hereunder shall make an
assignment for the benefit of creditors.

   18.4 Any petition shall be filed by or against Tenant or any guarantor of
Tenant's obligations hereunder under any section or chapter of the Federal
Bankruptcy Act, as amended from time to time, or under any similar law or
statute of the United States or any State thereof; or Tenant or any guarantor
of Tenant's obligations hereunder shall be adjudged bankrupt or insolvent in
proceedings filed thereunder.

   18.5 A receiver or trustee shall be appointed for all or substantially all of
the assets of Tenant or any guarantor of Tenant's obligations hereunder.

   18.6 Tenant shall desert or vacate the Premises.

   18.7 Any writ of execution, attachment, or garnishment shall be levied
against any interest of Tenant in this Lease, the Premises, or any property
located in the Premises.

19.0 Remedies. Upon the occurrence of any event of default under this Lease as
specified in Article 18 above, then without any notice or demand to Tenant
whatsoever, Landlord shall have the right (but not any duty) to exercise, on a
cumulative basis, any or all of the following remedies:

   19.1 Landlord may continue this Lease in full force and effect, and proceed
to collect all Rent when due.

   19.2 Landlord may continue this Lease in full force and effect and may enter
the Premises and relet all or any portion thereof to other parties for Tenant's
account. Tenant shall pay to Landlord on demand all costs Landlord incurs in
entering the Premises and releasing them, including, without limitation,
brokers' commissions, expenses of repairs and remodeling, attorneys' fees, and
all other actual costs. Reletting may be for a period shorter or longer than the
remaining term of this Lease. During the term of any reletting, Tenant shall pay
to Landlord the Rent due under this Lease on the dates due, less any net rents
Landlord receives from any reletting.

   19.3 Landlord may, without any notice or demand whatsoever, terminate
Tenant's rights under this Lease at any time. From and after any such
termination, Landlord shall have the right to recover from Tenant all costs,
expenses, losses and damages caused by, resulting from or incurred in connection
with said default and/or termination including, but not limited to:

    19.3.1 An amount equal to all unpaid Rent that had accrued prior to the time
of termination of this Lease;

    19.3.2 An amount equal to (a) the amount of Rent that would have accrued
under this Lease between (i) the date of termination of this Lease, and (ii) the
date the calculation is made under this Subsection 19.3.2 if this Lease had not
been so terminated, less (b) any net amounts of rent actually received by
Landlord with respect to such time period, plus

    19.3.3 An amount equal to (a) the present value of all Rent (assuming that
the Additional Rent payable hereunder for the future will be the same as for
the most recent Lease Year, with adjustments for partial Lease Years, as
necessary) which would have accrued under this Lease had this Lease not been
terminated, for the period of time between (i) the date of calculation of the
amounts due under Subsection 19.3.2, and (ii) the date the Lease Term would have
expired if this Lease had not been so terminated; less (b) the present value of
the average fair market rental price then being agreed to by landlords and
tenants in comparable leases of comparable size in comparable buildings in the
North Central/Perimeter market of metropolitan Atlanta, Georgia as determined
based upon all relevant factors by a broker selected by Landlord who is not
affiliated with Landlord but who is licensed in the State of Georgia and who has
had at least ten (10) years experience.

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<PAGE>

    immediately prior to the date in question, in evaluating similar, office
    space in metropolitan Atlanta, Georgia; and

       19.3.4 An amount equal to (a) all actual costs and expenses, including
    but not limited to attorneys' fees, that have been incurred by Landlord
    prior to the date the calculation of said amounts is made, plus (b) the
    present value of all costs and expenses, including but not limited to
    attorneys' fees, that with reasonable certainty are likely to be incurred
    thereafter by Landlord, which are reasonably necessary to compensate
    Landlord for all economic losses proximately caused by Tenant's default.

    In computing the present value of amounts for purposes of this Subsection
19.3, a discount rate of eight percent (8%) per annum shall be used.

    19.4 Landlord may have a receiver appointed to take possession of the
Premises and relet all or any portion thereof, in accordance with Subsection
19.2. Tenant shall pay to Landlord on demand all costs Landlord incurs in
connection therewith.

    19.5 Landlord may cure any default at Tenant's cost. If Landlord at any
time, by reason of Tenant's default, pays any sum to cure any default, the sum
so paid by Landlord shall be immediately due from Tenant to Landlord on demand,
and shall bear interest at the Default Rate from the date paid by Landlord until
Landlord shall have been reimbursed by Tenant. Said sum, together with interest
thereon, shall be Additional Rent.

    19.6 Landlord may apply a11 or part of the Security Deposit, as provided in
Section 3.3, to cure any Tenant default.

    19.7 Landlord may exercise any or all other rights or remedies available at
law or equity, including, without limitation, the right to seek to obtain
restraining orders, injunctions and decrees of specific performance.

20.0 Attorneys' Fees. If Landlord should bring any action under this Lease or
consult or place said Lease, or any amount payable by Tenant hereunder, with an
attorney concerning or for the enforcement of any of Landlord's rights
hereunder, then Tenant agrees in each and any such case to pay to Landlord all
costs, including, but not limited to, court costs and reasonable attorneys' fees
incurred in connection herewith.

21.0 Security Interest. In addition to the statutory landlord's lien, Landlord
shall have, at all times, and Tenant hereby grants to Landlord, a valid security
interest to secure payment of all rentals and other sums of money becoming due
hereunder from Tenant, and to secure payment of any damages or loss which
Landlord may suffer by reason of the breach of Tenant of any covenant, agreement
or condition contained herein, upon all goods, wares, equipment, fixtures,
furniture, improvements and other personal property of Tenant ("Tenants
Personal Property") presently or which may hereafter be situated on the
Premises, and all proceeds therefrom, and such property shall not be removed
therefrom without the consent of Landlord until all arrearages in Rent as well
as any and all other sums of money then due to Landlord hereunder shall first
have been paid and discharged and all the covenants, agreements and conditions
hereof have been fully complied with and performed by Tenant. Upon the
occurrence of an event of default by Tenant, Landlord may, in addition to any
other remedies provided herein, enter upon the Premises and take possession of
any and all goods, wares, equipment, fixtures, furniture, improvements and other
personal property of Tenant situated on the Premises, without liability for
trespass or conversion, and sell the same at public or private sale, with or
without having such property at the sale, after giving Tenant reasonable notice
of the time and place of any public sale or of the time after which any private
sale is to be made, at which sale Landlord or its assigns may purchase said
property unless otherwise prohibited by law. Unless otherwise provided by law,
and without intending to exclude any other manner of giving Tenant reasonable
notice, the requirement of reasonable notice shall be met if such notice is
given in the manner prescribed in Section 28.0 of this Lease at least five (5)
days before the time of sale. The proceeds from any such disposition, less any
and all expenses connected with the taking of possession, holding and selling of
the property (including reasonable attorneys' fees and other expenses), shall be
applied as a credit against the debts secured by the security interest granted
in this Section 21.0. Any surplus shall be paid to Tenant or as otherwise
required by law; and

                                       16
<PAGE>

Tenant shall pay any deficiencies forthwith. Upon request by Landlord, Tenant
agrees to execute and deliver to Landlord a financing statement in form
sufficient to perfect the security interest of Landlord in the said property and
the process thereof under the provisions of the Uniform Commercial Code in force
in the State of Georgia. The statutory lien for rent is not hereby waived, the
security interest herein granted being in addition and supplementary thereto.
Landlord covenants and agrees that, so long as Tenant is not in default
hereunder, Landlord will subordinate the security interest granted to Landlord
in this Section 21 to any future commercial lender of Tenant that desires to
attach and perfect a security interest in Tenant's Personal Property for
purposes of using same as collateral for a loan made to Tenant in connection
with an initial public offering of Tenant's stock. Furthermore, Landlord
covenants and agrees that, so long as Tenant is not in default hereunder,
Landlord will subordinate the security interest granted to Landlord in this
Section 21 to any commercial lender of Tenant that desires to attach and perfect
a security interest in Tenant's Personal Property to secure a purchase money
loan from said lender to Tenant for Tenant's purchase of Tenant's Personal
Property.

22.0 Mechanic's Lien. Tenant will not permit any mechanic's lien to be placed
upon the Premises, the Building or any improvements thereon, during the Lease
Term caused by or resulting from any work performed, materials furnished or
obligation incurred by or at the request of Tenant, and in the case of the
filing of any such lien, Tenant will promptly pay or otherwise discharge the
same. If default in payment or discharge thereof shall continue for forty-five
(45) days after written notice thereto from Landlord to Tenant, Landlord shall
have the right and privilege at Landlord's option of paying the same or any
portion thereof without inquiry as to the validity thereof, and any amounts so
paid, including expenses and interest, shall be so much Additional Rent
hereunder due from Tenant to Landlord and shall be repaid to Landlord
immediately on demand.

23.0 Waiver of Subrogation. Each party to this Lease (the "Waiving Party")
hereby waives any cause of action it might have against the other party hereto
on account of any loss or damage that is covered by any property insurance
policy that covers the Premises, Tenant's fixtures, personal property, leasehold
improvements or business and which names Tenant as a party insured, it being
understood and agreed that this provision is cumulative of Section 10.0 hereof.
Landlord and Tenant shall each have included in all policies of property
insurance respectively obtained by them with respect to the Building or Premises
a waiver by the insurer of all right of subrogation against the other (and, with
respect to Tenant's insurance, against Landlord's property manager) in
connection with any loss or damage insured against. To the full extent permitted
by law, Landlord and Tenant each waives all right of recovery against the other
(and, with respect to Tenant, against Landlord's property manager), and agrees
to release the other from liability for loss or damage to property to the extent
such loss or damage is covered by valid and collectible property insurance in
effect at the time of such loss or damage; provided, however, that the foregoing
release by each party is conditioned upon the other party's carrying insurance
with the above described waiver of subrogation, and if such coverage is not
obtained or maintained by either party, then the other party's foregoing release
shall be deemed to be rescinded until such waiver is either obtained or
reinstated. All said insurance policies shall be carried with companies licensed
to do business in the State of Georgia reasonably satisfactory to Landlord and
shall be noncancellable except after thirty (30) days written notice to
Landlord. Each party shall name Landlord, Landlord's property manager and any
other person designated by Landlord as additional insureds and provide that it
is primary to, and not contributing with, any policy carried by Landlord,
Landlord's property manager, or other designated person covering the same loss.
Tenant shall deliver duly exercised certificates of such insurance to Landlord
prior to the Commencement Date and at least thirty (30) days prior to the
expiration of each respective policy term. No insurance policy or policies
required to be carried by Tenant will be subject to more than a $25,000.00
deductible limit without Landlord's prior written consent. Landlord reserves the
right to require Tenant to carry such other insurance (including, without
limitation and as applicable, plate glass insurance, automobile liability
insurance, builder's risk insurance and liquor liability insurance) and
endorsements in such amounts as Landlord in its sole discretion may deem
necessary or appropriate. If Tenant fails to take out or keep in force any
insurance required to be carried by Tenant or to provide evidence of the same as
required herein, Landlord shall have the right, but shall not be obligated, to
obtain such insurance at the sole cost and expense of Tenant, and Tenant shall
reimburse Landlord for the cost thereof upon demand as additional Rent.

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<PAGE>

24.0 Tenant's Insurance

     Tenant shall carry (at its sole expense during the Term):

   (a)  all-risk property insurance, insuring Tenant's interest in its
improvements to the Premises and any and all furniture, fixtures, equipment,
supplies, inventory, contents and other property owned, leased, held or
possessed by Tenant and contained therein, such insurance coverage to include
business interruption insurance for one hundred percent (100%) of Tenant's gross
revenues for a period of twelve (12) months. Such insurance shall be in an
amount equal to the full replacement cost of such improvements and property, as
such may increase from time to time, without deduction for depreciation,
providing protection against all perils included within the classification of
fire, extended coverage, vandalism, malicious mischief, special extended peril
(a11 risk), boiler and machinery, flood, glass breakage and sprinkler leakage,
and naming Landlord as loss payee as its interest may appear;

   (b)  Workers' Compensation insurance as required by applicable law;

   (c)  commercial general liability insurance on an occurrence basis for injury
to or death of a person or persons and for damage to property occasioned by or
arising out of any construction work being done on the Premises, or arising out
of the condition, use, or occupancy of the Premises, or other portions of the
Building or Project, and covering Tenant's indemnification obligations imposed
by Paragraph 15 of this Lease, the limits of such policy or policies to be in
combined single limits amounts for both personal injury and property damage of
not less than Two Million and No/100 Dollars ($2,000,000) in primary liability
coverage and Five Million and No/100 Dollars ($5,000,000) in excess liability
coverage; and

   (d)  primary automobile liability insurance with limits of not less than One
Million and No/100 Dollars ($1,000,000) per occurrence, covering owned and non-
owned vehicles used by Tenant.

   Landlord retains the right, in its sole discretion, to increase the amount of
insurance required to be carried by Tenant not more frequently than annually
based on such factors as inflation, Tenant's insurance claims history, the
advice of Landlord's insurance advisors and any other relevant factors. Landlord
shall maintain all risk property insurance on the Building and commercial
general liability insurance coverage in an amount no less than the amount
required to be maintained by Tenant hereunder provided, however, that Landlord
may provide such coverage through self-insurance.

25.0 Brokerage. LaSALLE PARTNERS MANAGEMENT LIMITED ("LaSALLE") HAS REPRESENTED
LANDLORD IN THIS TRANSACTION. LASALLE SHALL BE PAID A COMMISSION BY LANDLORD IN
CONNECTION WITH THIS LEASE, UNDER A SEPARATE AGREEMENT. Tenant warrants that it
has had no dealings with any broker or agent in connection with the negotiation
or execution of this Lease other than with the broker specifically identified
above, and Tenant agrees to indemnify Landlord against all costs, expenses,
attorneys' fees or other liability for commissions or other compensation or
charges claimed by any broker or agent claiming the same by, through or under
Tenant, other than with the broker specifically identified above.

26.0 Change of Building Name. Landlord reserves the right to change the name by
which the Building is designated.

27.0 Estoppel Certificates. Tenant shall furnish from time to time when
requested by Landlord or the holder of any deed to secure debt or mortgage
covering all or any part of the Building or the improvements therein or the
Premises or any interest of Landlord therein, a certificate signed by
Tenant confirming and containing such factual clarifications and representations
deemed appropriate by Landlord or the holder of any deed to secure debt or
mortgage covering all of any part of the Building or the improvements therein
or the Premises or any interest of Landlord therein, and Tenant shall, within
ten (10) days following receipt of said proposed certificate from Landlord,
return a fully executed copy of said certificate to Landlord. In the event
Tenant shall fail to return a fully

                                       18
<PAGE>

executed copy of such certificate to Landlord within the foregoing ten (10) day
period, then Tenant shall be deemed to have approved and confirmed all of the
terms, conditions and representations contained in such certificate.

28.0 Notices. Each provision of this Lease, or of any applicable laws,
ordinances, regulations and other requirements with reference to the sending,
mailing or delivery of any notice, or with reference to the making of any
payment by Tenant to Landlord, shall be deemed to be compiled with when and if
the following steps are taken:

   (a) All Rent and other payments required to be made by Tenant to Landlord
hereunder shall be payable to Landlord at Landlord's Address set forth in
Section 1.5 or at such other address as Landlord may specify from time to time
by written notice delivered in accordance herewith, and

   (b) All notices, demands, requests, consents, documents and approvals
desired, necessary, required or permitted to be given pursuant to the terms
hereof shall be in writing and shall be to deemed to have been properly given if
personally delivered (including delivery by courier or by United Parcel Service
or similar overnight delivery service) or sent, postage prepaid, by first class
registered or certified United States mail, with or without return receipt
requested, addressed to the parties hereto at the respective addresses set forth
in Article 1, or at such other address in the United States as either of said
parties may from time to time designate by like notice. Any such notice, demand,
request or other communication shall be considered given or delivered, as the
case may be, on the date of personal delivery or if mailed, on the date
deposited in the United States mail, as evidenced by the registered or certified
receipt. Rejection or other refusal to accept or inability to deliver because of
changed address of which no notice was given shall be deemed to be receipt of
the notice, demand, request or other communication.

29.0 Force Majeure. When a period of time is herein prescribed for any action to
be taken by Landlord, Landlord shall not be liable or responsible for and there
shall be excluded from the computation for any such period of time, any delays
due to strikes, riots, acts of God, shortages of labor or materials, war, laws,
regulations or restrictions or any other causes of any kind whatsoever which are
beyond the control of Landlord.

30.0 Severability. If any clause or provision of this Lease is illegal, invalid
or unenforceable under present or future laws effective during the Lease Term,
then and in that event, it is the intention of the parties hereto that the
remainder of this Lease shall not be affected thereby, and it is also the
intention of the parties to this Lease that in lieu of each clause or provision
of this Lease that is illegal, invalid or unenforceable, there be added as a
part of this Lease a clause or provision as similar in terms to such illegal,
invalid or unenforceable clause or provision as may be possible and be legal,
valid and enforceable.

31.0 Counterpart Signatures; Amendments; Binding Effect. This Lease may be
executed by the parties in separate counterparts which shall constitute one
original when taken together. This Lease may not be a1tered, changed or amended,
except by instrument in writing signed by both parties hereto. No provision of
this Lease shall be deemed to have been waived by Landlord unless such waiver be
in writing signed by Landlord and addressed to Tenant, nor shall any custom or
practice which may evolve between the parties in the administration of the terms
hereof be construed to waive or lessen the right of Landlord to insist upon the
performance by Tenant in strict accordance with the terms hereof. The terms and
conditions contained in this Lease shall apply to, inure to the benefit of,
and be binding upon the parties hereto, and upon their respective successors in
interest and legal representatives, except as otherwise herein expressly
provided.

32.0 Quiet Enjoyment. Provided Tenant has performed all of the terms and
conditions of this Lease, including the payment of Rent, to be performed by
Tenant, Tenant shall peaceably and quietly hold and enjoy the Premises for the
Lease Term, without hindrance from Landlord, subject to the terms and
conditions of this Lease.

33.0 Gender. Words of any gender used in this Lease shall be held and construed
to include any other gender, and words in the singular number shall be held to
include the plural, unless the context otherwise requires.

                                       19
<PAGE>

34.0 Joint and Several Liability. If there be more than one Tenant, the
obligations hereunder imposed upon Tenant shall be joint and several. If there
be a guarantor of Tenant's obligations hereunder, the obligations hereunder
imposed upon Tenant shall be the joint and several obligations of Tenant and
such guarantor and Landlord need not first proceed against Tenant before
proceeding against such guarantor nor shall any such guarantor be released from
its guaranty for any reason whatsoever, including without limitation, in case of
any amendments hereto, waivers hereof or failure to give such guarantor any
notices hereunder.

35.0 Captions. The captions contained in this Lease are for convenience of
reference only, and in no way limit or enlarge the terms and conditions of this
Lease.

36.0 Exhibits and Attachments. All exhibits, attachments, riders and addenda
referred to in this Lease are incorporated into this Lease and made a part
hereof for all intents and purposes.

37.0 No joint Venture. Landlord and Tenant are not and shall not be deemed to
be, for any purpose, partners or joint venturers with each other.

38.0 Time of the Essence. Time is of the essence with regard to each provision
of this Lease.

39.0 Evidence of Authority. If Tenant is other than a natural person, Tenant
shall deliver to Landlord such legal documentation as Landlord may request to
evidence the authority of those signing this Lease to bind the Tenant.

40.0 Governing Law. The Lease shall be construed and interpreted in accordance
with and governed by the substantive laws (not the conflicts laws or choice of
law rules) of the State of Georgia.

41.0 Entire Agreement. This Lease constitutes the entire agreement between the
parties, and there is no other agreement between the parties relating in any
manner to the Project.

42.0 Exculpation. The term Landlord as used in this Lease so far as covenants
or obligations on the part of Landlord are concerned shall be limited to mean
and include only the owner or owners at the time in question of the Landlord's
interest in the Building. Tenant acknowledges and agrees, for itself and its
successors and assigns, that no trustee, director, officer, employee or agent of
Landlord shall be personally liable for any of the terms, covenants or
obligations of Landlord hereunder, and Tenant shall look solely to Landlord's
interest in the Building for the collection of any judgment (or enforcement of
any other judicial process) requiring the payment of money by Landlord with
respect to any of the terms, covenants and conditions of this Lease to be
observed or performed by Landlord and no other property or assets of Landlord
shall be subject to levy, execution or other enforcement procedures for the
satisfaction of any obligation due Tenant or its successors or assigns.

43.0 Covenants are Independent. Each convenant of Landlord and Tenant under this
Lease is independent of each other covenant under this Lease, and no default by
either party in performance of any covenant shall excuse the other party from
the performance of any other covenant.

44.0 Usufruct. The rights of Tenant hereunder constitute a usufruct, which is
not subject to levy or sale. No estate shall pass out of Landlord.

                                       20
<PAGE>

45.0  Right to Relocate. At any time or from time to time during the Lease Term
or any renewal thereof, Landlord shall have the unrestricted and unconditional
right to relocate Tenant from the Premises to any other office space that is
substantially similar in size to the Premises in the Project or within the
Northridge office complex. Landlord shall deliver notice to Tenant of Landlord's
desire to relocate Tenant, together with a proposal for the area to which such
Premises shall be relocated and an estimated date on which Tenant will be
relocated. Should Landlord exercise its right to relocate Tenant under this
Section 45.0, then: (a) expenses of said relocation or of any necessary
renovation or alteration, as calculated by Landlord prior to any relocation,
shall be paid by Landlord prior to any relocation, shall be paid by Landlord;
and (b) following such relocation, the substituted space shall for all purposes
(including the calculation of Rent) thereinafter constitute the Premises and all
terms and conditions of this Lease shall apply with full force and effect to the
Premises as so relocated. If Tenant refuses to move its premises on the date
specified in Landlord's notice, Landlord shall have the right to terminate this
Lease by giving notice of such termination to Tenant (the "Termination Notice").
Such termination shall be effective upon my date selected by Landlord in the
Termination Notice which is at least ten (10) days after the Termination Notice
is given by Landlord to Tenant. Upon the effective due of such termination,
Tenant shall have not further Rent or other obligations hereunder for any
periods after the effective date of such termination, provided, however, that
nothing contained in sentence shall affect Tenant's obligations to pay to
Landlord any Rent or other money due hereunder, or to fulfill or remain liable
for any other obligations, that accrued prior to said termination date. Within
twenty (20) days after such termination, Landlord shall return the balance of
the Security Deposit and the Letter of Credit to Tenant. Tenant hereby further
covenants and agrees to promptly execute and deliver to Landlord any lease
amendment or other such document appropriate to reflect the changes in the Least
described or contemplated above.

46.0 Hazardous Materials.

   (a) Tenant shall not cause or permit any Hazardous Material (as defined in
Section 46.0(c) below) to be brought, kept or used in or about the Building by
Tenant, its agents, employees, contractors or invitees. Tenant hereby
indemnifies Landlord from and against any breach by Tenant of the obligations
stated in the preceding sentence, and agrees to defend and hold Landlord
harmless from and against any and all loss, damage, cost and/or expenses
(including, without limitation, diminution in value of the Building, damages for
the loss or restriction on use of rentable or usable space or of any amenity of
the Building, damages arising from any adverse impact on marketing of space in
the Building, and sums paid in settlement of claims, attorneys' fees, consultant
fees, and expert fees) which arise during or after the Lease Term as a result of
such breach. This indemnification of Landlord by Tenant includes, without
limitation, costs incurred in connection with any investigation of site
conditions or any cleanup, remedial, removal, or restoration work required by
any federal, state, or local governmental agency or political subdivision
because of Hazardous Material present in the soil or ground water on or under
the Building which results from such a breach. Without limiting the foregoing,
if the presence of any Hazardous Material in the Building caused or permitted by
Tenant results in any contamination of the Building. Tenant shall promptly take
all actions at its sole expense as are necessary to return the Building to the
conditions existing prior to the introduction of such Hazardous Material to the
Building; provided that the Landlord's approval of such actions, and the
contractors to be used by Tenant in connection therewith, shall first be
obtained.

   (b) Notwithstanding any provision in this Lease to the contrary, it shall
not be unreasonable for Landlord to withhold its consent to any proposed
transfer, assignment, or subletting of the Premises if: (i) the proposed
transferee's anticipated use of the Premises involves the generation, storage,
use, treatment, or disposal of Hazardous Material; (ii) the proposed transferee
has been required by any prior landlord, lender, or governmental authority to
take remedial action in connection with Hazardous Material contaminating a
property if the contamination resulted from such transferee's actions or use of
the property in question; or (iii) the proposed transferee is subject to an
enforcement order issued by any governmental authority in connection with the
use, disposal, or storage of a Hazardous Material.

   (c) As used herein, the term "Hazardous Material"  means any hazardous or
toxic substance, material, or waste which is or becomes regulated by any local
governmental authority or the United States Government. The term "Hazardous
Material" includes, without limitation, any

                                       21
<PAGE>

material or substance which is: (i) defined as a "hazardous waste", "extremely
hazardous waste", or "restricted hazardous waste", or similar term under the law
of the jurisdiction where the property is located; or (ii) designated as a
"hazardous substance" pursuant to Section 311 of the Federal Water Pollution
Control Act (33 U.S.C. (S) 1317); (iii) defined as a "hazardous waste" pursuant
to Section 1004 of the Federal Resource Conservation and Recovery Act, 47 U.S.S.
(S) 6901 et seq. (42 U.S.C. (S) 6903); or (iv) defined as a "hazardous
substance" pursuant to Section 101 of the Comprehensive Environmental Response,
Compensation and Liability Act, 42 U.S.C. (S) 9601 et seq. (42 U.S.C. (S) 9601).

   (d) As used herein, the term "Laws" means any applicable federal, state, or
local laws, ordinances, or regulation relating to any Hazardous Material
affecting the Building, including, without limitation, the laws, ordinances, and
regulations referred to in Section 46.0(c) above.

   (e) Landlord and its employees, representatives and agents shall have access
to the Building during reasonable hours and upon reasonable notice to Tenant in
order to conduct periodic environmental inspections and tests of Hazardous
Material contamination of the Building.

   (f) Landlord represents that to the Landlord's knowledge, Landlord has not
received any written notices from any governmental authority having authority
over the Premises that the Premises are in violation of any Laws.

47.0 Letter of Credit.

   Tenant shall, within twenty (20) business days after the date hereof, deliver
to Landlord an irrevocable, unconditional letter of credit ("Letter of Credit")
in favor of Landlord in the following amounts:

       Lease Year           Letter of Credit Amount
       ----------           -----------------------
           1                   U.S. $120,000.00
           2                          95,000.00
           3                          60,000.00
           4                          45,000.00
           5                              -0-

   Tenant's failure to provide the Letter of Credit within said twenty (20)
business day period after the date hereof shall constitute an event of material
default hereunder. The expiration date of the Letter of Credit shall be no
earlier than the end of the fourth (4th) Lease Year of the Lease Term; provided,
however, that such Letter of Credit may be of a duration shorter than said
period, so long as Tenant replaces said Letter of Credit with a new Letter of
Credit, on the same terms and conditions as the prior Letter of Credit, and in
the applicable amount based on the foregoing schedule in this Section 47.0, at
least one (1) month prior to the expiration of the prior Letter of Credit. If
Tenant fails to replace a prior Letter of Credit within the period required
herein, then Landlord shall be immediately authorized and entitled to demand and
receive payment under said Letter of Credit, and to apply and hold the proceeds
therefrom as an additional security deposit under the terms and conditions of
Section 3.3 of this Lease. Said Letter of Credit must be acceptable to Landlord
as to form, content, and issuing bank, and must not require any documentation in
order to be valued upon and must contain an explicit waiver by the issuing bank
of any statutory or other right to delay or defer payment upon demand including,
but not limited to, a waiver of such rights as are set forth in Article 5,
Section 5-112(l)(a) and (b) of the Uniform Commercial Code. Said Letter of
Credit must also provide that the issuing bank, upon any presentation of a draft
for valuation thereon, shall honor such draft by promptly delivering the amount
of the draft, by official bank or cashier's check, to Landlord or, at Landlord's
sole option, by promptly wiring Federal Funds in the amount of the draft into
such account(s) as Landlord may specifically direct, in writing. Landlord may
draw down upon said Letter of Credit in the event that Tenant is in default with
respect to the payment of any rent

                                       22
<PAGE>

or other sums due to be paid to the Landlord under this Lease, and the
applicable grace, notice and cure period, if any, has expired.

48.0 Special Provisions. The special provisions set forth in Exhibit "D" hereto,
if any, are made a part hereof.

     SIGNED, SEALED AND DELIVERED as of the date first above written.

                                    TENANT:

                                    ACCORD VIDEO TELECOMMUNICATIONS, INC.

7/21/97                             BY:  /s/ Jules L. DeVigne
-----------------                       -------------------------------
Date Executed                           Name: Jules L. DeVigne
                                        Its:  CEO

                                    Attest  /s/ Jules L. DeVigne
                                           ----------------------------
                                        Name: Jules L. DeVigne
                                        Its:  Secretary

    By the execution and delivery of this Lease, Tenant has made and shall be
deemed to have made a continuous and irrevocable offer to lease the Premises, on
the terms contained in this Lease, subject only to acceptance by Landlord (as
evidenced by Landlord's signature hereon), which Landlord may accept in its sole
and absolute discretion.

                                        LANDLORD:

                                        500 NORTHRIDGE POINTE, INC.,
                                        a Georgia corporation

7/30/97                                 BY:   /s/ [ILLEGIBLE]
---------------                             -------------------------
Date Executed

                                       23
<PAGE>

                                  EXHIBIT "A"

                               Legal Description

                           NORTHRIDGE BUILDING 5OO

    ALL THAT TRACT OR PARCEL OF LAND lying and being in Land Lot 385, 18th
District, Fulton County, Georgia, and being more particularly described as
follows:

    To FIND THE POINT OF BEGINNING, commence at a point located on the northerly
right-of-way of Northridge Road (100-foot right-of-way), said point being
located at the intersection of said right-of-way line with the land lot line
common to Land Lots 25 and 385 (said land lot line also being the district line
dividing the 17th and l8th Districts, Fulton County); thence along said
northerly right-of-way line of Northridge Road North 84 degrees 58 minutes 00
seconds East, a distance of 546.56 feet to a point on said right-of-way line,
and THE POINT OF BEGINNING; FROM THE POINT OF BEGINNING AS THUS ESTABLISHED, and
leaving said northerly right-of-way line of Northridge Road, run North 05
degrees 02 minutes 00 seconds West, a distance of 95.00 feet to a point; thence
North 20 degrees 50 minutes 00 seconds East, a distance of 105.00 feet to a
point; thence North 10 degrees 55 minutes 00 seconds East, a distance of 120.00
feet to a point; thence North 23 degrees 20 minutes 00 seconds East, a distance
of 122.00 feet to a point; thence North 52 degrees 24 minutes 00 seconds East, a
distance of 197.00 feet to a point; thence North 20 degrees 01 minutes 00
seconds East, a distance of 75.00 feet to a point; thence North 22 degrees 15
minutes 17 seconds West, a distance of 83.35 feet to a point located on the
southerly right-of-way of Northridge Parkway (variable right-of-way); thence
northeasterly along the southerly right-of-way line of Northridge Parkway along
the arc of a curve to the left an arc distance of 45.71 feet (said curve having
a radius of 858.51 feet, being subtended by a chord bearing North 69 degrees 16
minutes 17 seconds East, and having a chord distance of 45.71 feet) to a point
located on said southerly right-of-way line; thence continuing along said right-
of-way line North 67 degrees 44 Minutes 43 seconds East, a distance of 52.81
feet to a point; thence continuing along said right-of-way line along the arc of
a curve to the right an arc distance of 599.91 feet (said curve having a radius
of 802.79 feet, being subtended by a chord bearing North 89 degrees 09 minutes
13 seconds East, and having a chord distance of 586.05 feet) to a point; thence
continuing along said right-of-way line South 69 degrees 26 minutes 19 seconds
East, a distance of 145.88 feet; thence southeasterly and southwesterly
rounding the arc of a curve at a point where Northridge Parkway and Dunwoody
Place (variable right-of-way) intersect (said arc having a radius of 20.00 feet,
being subtended by a chord bearing South 18 degrees 53 minutes 54 seconds East,
and having a chord distance of 30.88 feet) an arc distance of 35.28 feet to a
point located on the westerly right-of-way of Dunwoody Place; thence South 31
degrees 38 minutes 30 seconds West along the westerly right-of-way line of
Dunwoody Place a distance of 51.60 feet to a concrete monument found; thence
continuing along said right-of-way line South 34 degrees 52 minutes 07 seconds
West, a distance of 310.68 feet to a point; thence continuing along said right-
of-way line South 43 degrees 22 minutes 04 seconds West, a distance of 302.98
feet to a concrete monument found; thence continuing along said right-of-way
line South 63 degrees 11 minutes 04 seconds West, a distance of 207.91 feet to a
point located at the intersection of the westerly right-of-way line of Dunwoody
Place and the northerly right-of-way line of Northridge Road (100-foot right-of-
way); thence along the northerly right-of-way line of Northridge Road South 84
degrees 58 minutes 00 seconds West, a distance of 478.00 feet to a point located
on said right-of-way line and the POINT OF BEGINNING; said parcel being depicted
as "Tract III" containing 12.309 acres of land, as shown on that certain plat of
survey entitled "As Built Survey [Northridge Building 500] for LaSalle Advisors
Limited, 500 Northridge Pointe, Inc., MLH Income Realty Partnership III, and
Commonwealth Land Title Insurance Company," prepared by Cleveland S. Boutwell,
Jr., Georgia Registered Land Surveyor No. 1704, of Benchmark Engineering
Corporation, dated June 22, 1982, and last revised December 18, 1995.

    AND TOGETHER WITH an undivided fifty percent (50%) interest in all that
certain tract or parcel of land lying and being in Land Lot 385, 18th District,
Fulton County, Georgia and being more particularly described as follows:

    To FIND THE POINT OF BEGINNING, commence at a point located on the northerly
right-of-way of Northridge Road (100-right-of-way), said point being located at
the intersection of said right-of-way line with the land lot line common to Land
Lots 25 and 385 (said land lot line also being the district line dividing the
17th and 18th Districts, Fulton County); thence along said northerly right-of-
way line of Northridge Road North 84 degrees 58 minutes 00 seconds East, a
distance of 468.56 feet to a point on said

                                       24
<PAGE>

right-of-way line, and THE POINT OF BEGINNING; FROM THE POINT OF BEGINNING AS
THUS ESTABLISHED, and leaving said northerly right-of-way line of Northridge
Road, run thence North 05 degrees 26 minutes 00 seconds East, a distance of
88.75 feet to a point; thence North 26 degrees 07 minutes 00 seconds East, a
distance of 136.54 feet to a point; thence North 10 degrees 55 minutes 00
seconds East, a distance of 154.00 feet to a point; thence North 23 degrees 20
minutes 00 seconds East, a distance of 95.00 feet a point; thence North 52
degrees 24 minutes 00 seconds East, a distance of 206.00 feet to a point; thence
North 20 degrees 01 minutes 00 seconds East, a distance of 50.00 feet to a
point; thence North 22 degrees 15 minutes 17 seconds West, a distance of 68.00
feet to a point located on the southerly right-of-way line of Northridge Parkway
(variable right-of-way); run thence along the southerly right-of-way line of
said Northridge Parkway along the arc of a curve to the left (said arc having a
radius of 858.51 feet, a chord bearing of North 72 degrees 07 minutes 52 seconds
East and a chord length of 40.00 feet) an arc distance of 40.00 feet to a point
located on said southerly right-of-way line; thence leaving southerly right-of-
way line, run South 22 degrees 15 minutes 17 seconds East, a distance of 83.35
feet to a point; thence South 20 degrees 01 minutes 00 seconds West, a distance
of 75.00 feet to a point South 52 degrees 24 minutes 00 seconds West, a distance
of 197.00 feet to a point, thence South 23 degrees 20 minutes 00 seconds West, a
distance of 122.00 feet to a point; thence South 10 degrees 55 minutes 00
seconds West, a distance of 120.00 feet to a point; thence South 20 degrees 50
minutes 00 seconds West, a distance of 105.00 feet to a point; thence South 05
degrees 02 minutes 00 seconds East, a distance of 95.00 feet to a point located
on the northerly right-of-way line of Northridge Road (100-foot right of-way);
thence along said northerly right-of-way line of Northridge Road South 84
degrees 58 minutes 00 seconds West, a distance of 78.00 feet to a point located
on said northerly right-of-way line, and the POINT OF BEGINNING; said parcel
containing 0.834 acres of land, as shown as "Tract IV (Private Road)" on that
certain plat of survey entitled, "As-Built Survey [of Northridge Building 400]
for LaSalle Advisors Limited, 400 Northridge Pointe, Inc., Northridge 400
Associates and Commonwealth Land Title Insurance Company," prepared by Cleveland
S. Bourwell, Jr., Georgia Land Surveyor No. 1704, of Benchmark Engineering
Corporation, dated December 21, 1984, and last revised December 18, 1995.

                                       25
<PAGE>

                                  EXHIBIT A-1

           [Diagram of 6,427 square feet of leased office space in
       Suite 200 at 500 Northridge Road, Atlanta, Georgia appears here.]

<PAGE>

                                  EXHIBIT "B"

                          MEMORANDUM CONFIRMING TERM

               [FORM ONLY - NOT TO BE EXECUTED UNTIL OCCUPANCY]

     THIS MEMORANDUM ("Memorandum") is made as of ________________, 19__ between
500 NORTHRIDGE POINTE, INC., a Georgia corporation ("Landlord" ) and Accord
Video Telecommunications, Inc., a __________________ corporation ("Tenant"),
pursuant to that certain Lease Agreement between Landlord and Tenant dated as of
_______________, 1997 (the "Lease") for the premises located at 500 Northridge
Road, Suite 200, as more particularly described in the Lease. All initial-
capitalized terms used in this Memorandum have the meanings ascribed to them in
the Lease.

     1. Landlord and Tenant hereby confirm that:

        (a)  The Commencement Date of the Term is __________________, 19__;

        (b)  The Expiration Date of the Term is __________________, 19__;

        (c)  The date rental commences under the Lease is ______________, 19__.

     2. Tenant hereby confirms that:

        (a)  All commitments, arrangements or understandings made to induce
             Tenant to enter into the Lease have been satisfied;

        (b)  All space and improvements have been completed and furnished in
             accordance with the provisions of the Lease; and

        (c)  Tenant has accepted and is in full and complete possession of the
             Premises.

     3. This Memorandum shall be binding upon and inure to the benefit of the
parties and their permitted successors and assigns.

     IN WITNESS WHEREOF, the parties have executed this Memorandum as of the
date first set forth above.

LANDLORD:                                 TENANT:

500 NORTHRIDGE POINTE, INC.               ACCORD VIDEO TELECOMMUNICATIONS, INC.

BY:_____________________________          BY:__________________________________
   Authorized Representative
                                             Name:_____________________________

                                             Its:______________________________

                                       27
<PAGE>

                                  EXHIBIT "C"

                         Attached to and made part of

                    Lease Agreement dated: July ____, 1997

Landlord: 500 Northridge Pointe, Inc.

Tenant:   Accord Video Telecommunications, Inc.

     The following rules and regulations shall apply, where applicable, to the
Premises, the Building, the parking garage associated therewith, the land
situated beneath the Building and the appurtenances thereto:

     1.   Sidewalks, doorways, vestibules, halls, stairways and other similar
areas shall not be obstructed by tenants or used by any tenant for any purpose
other than ingress and egress to and from the leased premises and for going from
one to another part of the Building.

     2.   Plumbing, fixtures and appliances shall be used only for the purpose
for which designed, and no sweepings, rubbish, rags, Hazardous Material as
defined herein, or other unsuitable material shall be thrown or placed therein.
Damage resulting to any such fixtures or appliances from misuse by a tenant or
such tenant's agents, employees or invitees, shall be paid by such tenant, and
Landlord shall not in any case be responsible therefore.

     3.   No signs, advertisements or notices shall be painted or affixed on or
to any windows or doors or other part of the Building except of such color,
size and style and in such places as shall be first approved in writing by
Landlord. No nails, hooks, or screws shall be driven or inserted in any part of
the Building except as a part of the hanging of normal office art, and except by
the building maintenance personnel nor shall any part of the Building be defaced
by tenants. No curtains or other window treatments shall be placed between the
glass and the Building standard window treatments.

     4.   Landlord will provide and maintain in alphabetical directory board for
all tenants in the main lobby of the Building and no other directory shall be
permitted unless previously consented to by Landlord in writing.

     5.   Landlord shall provide all locks for doors in each tenant's leased
premises, at the cost of such tenant, and no tenant shall place any additional
lock or locks on any doors in its leased area without Landlord's prior written
consent. A reasonable number of keys to the locks on the doors in each tenant's
leased premises shall be furnished by Landlord to each tenant, at the cost of
such tenant, and the tenants shall not have any duplicate keys made.

     6.   With respect to work being performed by tenants in any leased premises
with the approval of Landlord, all tenants will refer all contractors,
contractors' representatives and installation technicians rendering any service
to them to Landlord for Landlord's supervision, approval and control before the
performance of any contractual services. This provision shall apply to all work
performed in the Building including, but not limited to, installations of
telephones, telegraph equipment, electrical devices and attachments, and any
and a11 installations of every nature affecting floors, walls, woodwork, trim,
windows, ceilings, equipment and any other physical portion of the Building.

     7.   Movement in or out of the Building of furniture or office equipment,
or dispatch or receipt by tenants of any bulky material, merchandise or
materials which requires the use of elevators or stairways, or movement through
the Building entrances or lobby shall be restricted to such hours as Landlord
shall designate. All such movement shall be under the supervision of Landlord
and in the manner agreed between the tenants and Landlord by prearrangement
before performance. Such prearrangement initiated by a tenant will include
determination by Landlord, and subject to its decision and control, as to the
time, method, and routing of movement and as to limitations for safety

                                      C-1

<PAGE>

or other concern which may prohibit any article, equipment or any other item
from being brought into the Building. The tenants are to assume all risks as to
the damage to articles moved and injury to persons or public engaged or not
engaged in such movement, including equipment, property and personnel of
Landlord if damaged or injured as a result of acts in connection with carrying
out this service for a tenant from the time of entering the Project to
completion of work; and Landlord shall not be liable for acts of any person
engaged in, or any damage or loss to any of said property or persons resulting
from, and act in connection with such service performed for a tenant.

     8.   Landlord shall have the power to prescribe the weight and position of
safes and other heavy equipment or items, which shall in all cases, to
distribute weight, stand on supporting devices approved by Landlord. All damages
done to the Building by the installation or removal of any property of a tenant,
or done by a tenant's property while in the Building, shall be repaired at the
expense of such tenant.

     9.   A tenant shall notify the Building manager when safes or other heavy
equipment are to be taken in or out of the Building, and the moving shall be
done under the supervision of the Building manager, after written permission
from Landlord. Persons employed to move such property must be acceptable to
Landlord.

     10.  Corridor doors, when not in use, shall be kept closed.

     11.  Each tenant shall cooperate with Landlord's employees in keeping its
leased premises neat and clean. Tenants shall not employ any person for the
purposes of such cleaning other than the Building's cleaning and maintenance
personnel. Landlord shall be in no way responsible to the tenants, their agents,
employees, or invitees for any loss of property from the leased premises or
public areas or for any damages to any property thereon from any cause
whatsoever.

     12.  To insure orderly operation of the Building, no water, newspapers or
the like shall be delivered to any leased area except by persons consented to
by Landlord.

     13.  Should a tenant require telegraphic, telephone, annunciator or other
communication service, Landlord will direct the electrician where and how wires
are to be introduced and placed and none shall be introduced or placed except as
Landlord shall direct. Electric current shall not be used for power of heating
without Landlord's prior written permission.

     14.  Tenants shall not make or permit any improper, objectionable or
unpleasant noises or odors in the Building or otherwise interfere in any way
with other tenants or persons having business with them.

     15.  Nothing shall be swept or thrown into the corridors, halls, elevator
shafts or stairway. No birds or animals shall be brought into or kept in, on or
about any tenant's leased premises.

     16.  No machinery of any kind shall be operated by any tenant in its
leased premises without the prior written consent of Landlord, nor shall any
tenant use or keep in the Building any inflammable or explosive fluid or any
other Hazardous Material.

     17.  No portion of any tenant's leased premises shall at any time be used
or occupied as sleeping or lodging quarters.

     18.  Landlord reserves the right to rescind any of these rules and
regulations and to make such other and further rules and regulations as in its
sole judgment shall from time to time be deemed appropriate for the safety,
protection, care and cleanliness of the Building, the operation thereof, the
preservation of good order therein and the protection and comfort of the tenants
and their agents, employees and invitees, which rules and regulations, when made
and written notice thereof is given to tenant, shall be binding upon it in like
manner as if originally herein prescribed.

     19.  Landlord will not be responsible for lost or stolen personal property,
money or jewelry from tenant's leased premises or public or common areas
regardless of whether such loss occurs when the area is locked against entry or
not.

                                      C-2

<PAGE>

     20.  Any additional services, not required by lease to be performed by
Landlord, which Tenant requests Landlord to perform and which are performed by
Landlord shall be billed to Tenant at Landlord's cost plus twenty percent (20%).

     21.  Smoking is prohibited in a11 areas of the Building except where
expressly permitted by Landlord, if any. Landlord reserves the right to relocate
or eliminate any such areas where smoking is permitted, at any time.

                                      C-3

<PAGE>

                                  EXHIBIT "D"

                              SPECIAL PROVISIONS

                      SPECIAL PROVISIONS INVOLVING LEASE
                                    BETWEEN
                          500 NORTHRIDGE POINTE, INC.
                                      AND
                     ACCORD VIDEO TELECOMMUNICATIONS, INC.

                                     NONE.

     [NO SPECIAL PROVISIONS WERE INCLUDED AS PART OF THE ORIGINAL LEASE.]

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