Document:

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                                                                   Exhibit 10.12

                       NOTE AND WARRANT PURCHASE AGREEMENT

THIS NOTE AND WARRANT PURCHASE AGREEMENT is made as of the 3lst day of March,
1998 by and among VStream Incorporated, a Delaware corporation (the "Company"),
and the persons and entities named on the Schedule of Purchasers attached hereto
(individually, a "Purchaser" and collectively, the "Purchasers").

The Parties hereby agree as follows:

1.   Amount and Terms of the Loan; Purchase and Sale of the Warrants

     1.1. The Loan. Subject to the terms of this Agreement, the Company shall
          --------
borrow from each Purchaser and each Purchaser shall lend to the Company the
amount set forth opposite each such Purchaser's name in the first column of the
attached Schedule of Purchasers (the "Loan Amount") pursuant to a convertible
subordinated promissory note in the form attached hereto as Exhibit A (the
"Note" or collectively, the "Notes"). The Loan Amounts are hereinafter referred
to collectively as the "Loan."

     1.2. Purchase and Sale of Warrants. The Company will issue and sell to each
          -----------------------------
Purchaser and each Purchaser will purchase, severally and not jointly, warrants
in the form attached hereto as Exhibit B (the "Warrants") to purchase that
number of shares of the Company's Series C Preferred Stock as set forth opposite
each Purchaser's name in the second column of the Schedule of Purchasers on the
following terms: (i) the per share exercise price will be One Dollar and Four
Cents ($1.04) per share (subject to adjustment as set forth therein) and (ii)
the purchase price of the Warrants will be One Tenth of One Cent ($.00l) per
warrant share. These warrants shall be issued simultaneously with the closing of
the Loan.

2.   The Closing

     2.1. Closing Date. The closing shall be held no later than March 31, 1998
          ------------
at the offices of Holland & Hart LLP, 555 Seventeenth Street, Suite 3200,
Denver, Colorado 80202, or at such other time as the Company and Purchasers
shall agree (the "Closing Date").

     2.2. Delivery. At the Closing (i) each Purchaser will deliver to the
          --------
Company a check or wire transfer of funds in the amount of such (A) Purchaser's
Loan Amount plus (B) the purchase price of the Warrants being issued to such
Purchaser; and (ii) the Company shall deliver to each Purchaser a Note
representing such Purchaser's Loan Amount and an executed Warrant for the shares
indicated opposite such Purchaser's name on the Schedule of Purchasers.

3.   Representations and Warranties of the Company.

The Company hereby represents and warrants to each Purchaser as follows:
<PAGE>

     3.1. Corporate Power. The Company will have at the Closing Date all
          ---------------
requisite corporate power to execute and deliver this Agreement, the Notes and
the Warrants and to carry out and perform its obligations under the terms of
this Agreement, the Notes and the Warrants.

     3.2. Authorization. All corporate action on the part of the Company, its
          -------------
directors and its stockholders necessary for the authorization, execution,
delivery and performance of this Agreement by the Company and the performance of
the Company's obligations hereunder, including the issuance and delivery of the
Notes and the Warrants has been taken or will be taken prior to the Closing.
This Agreement, the Notes and the Warrants, when executed and delivered by the
Company, and upon the filing with the Secretary of State of the state of
Delaware of an amendment to the Company's Certificate of Incorporation to
authorize the Series C Preferred Stock into which the Notes are convertible and
for which the Warrants are exercisable shall constitute valid and binding
obligations of the Company enforceable in accordance with their terms, subject
to laws of general application relating to bankruptcy, insolvency, the relief of
debtors and, with respect to rights to indemnity, subject to federal and state
securities laws. The Series C Preferred Stock or other equity securities of the
Company, when issued in compliance with the provisions of this Agreement, the
Notes and the Warrants, and the Company's Certificate of Incorporation will be
validly issued, fully paid and nonassessable and free of any liens or
encumbrances.

     3.3. Consents. All consents, approvals, orders or authorizations of, or
          --------
registrations, qualifications, designations, declarations or filings with, any
governmental authority or other third party, required on the part of the Company
in connection with the valid execution and delivery of this Agreement, the
offer, sale or issuance of the Notes, the Warrants and the equity securities
issuable upon exercise of the Warrants, conversion of the Notes or the
consummation of any other transaction contemplated hereby shall have been
obtained and will be effective at the Closing, except for notices required or
permitted to be filed with certain state and federal securities commissions
following the Closing, which notices will be filed on a timely basis.

     3.4. Offering. Assuming the accuracy of the representations and warranties
          --------
of the Purchasers contained in Section 4 hereof, the offer, issue and sale of
the Notes and the Warrants are and will be exempt from the registration and
prospectus delivery requirements of the Securities Act of 1933, as amended (the
"1933 Act"), and, upon the filing of certain forms which will be completed
promptly following the Closing, are exempt from registration and qualification
under the registration, permit or qualification requirements of all applicable
state securities laws.

4.   Representations and Warranties of the Purchasers

     4.1. Purchase for Own Account. Each Purchaser represents that it is
          ------------------------
acquiring the Notes, the equity securities issuable upon conversion of the
Notes, the Warrants and the equity securities issuable upon exercise of the
Warrants (collectively, the "Securities") solely for its own account and
beneficial interest and not as nominee for any other party, and for investment
and not for sale or with a view to distribution of the Securities or any part
thereof, and has no present intention of selling (in connection with a
distribution or otherwise), granting any participation in, or otherwise
distributing the same.

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<PAGE>

     4.2. Information and Sophistication. Each Purchaser acknowledges that it
          ------------------------------
has received all the information it has requested from the Company and considers
necessary or appropriate for deciding whether to acquire the Notes and Warrants.
Each Purchaser represents that it has had an opportunity to ask questions and
receive answers from the Company regarding the terms and conditions of the
offering of the Notes and the Warrants and to obtain any additional, information
necessary to verify the accuracy of the information given the Purchaser. Each
Purchaser further represents that it has such knowledge and experience in
financial and business matters that it is capable of evaluating the merits and
risk of this investment.

     4.3. Ability to Bear Economic Risk. Each Purchaser acknowledges that
          -----------------------------
investment in the Notes and the Warrants involves a high degree of risk, and
represents that it is able, without materially impairing its financial
condition, to hold the Securities for an indefinite period of time and to suffer
a complete loss of its investment.

     4.4. Further Limitations on Disposition. Without in any way limiting the
          ----------------------------------
representations set forth above, each Purchaser further agrees not to make any
disposition of all or any portion of the Securities unless and until:

          (a) There is then in effect a registration statement under the 1933
Act covering such proposed disposition and such disposition is made in
accordance with such registration statement; or

          (b) (i) The Purchaser shall have notified the Company of the proposed
disposition and shall have furnished the Company with a detailed statement of
the circumstances surrounding the proposed disposition, and (ii) if reasonably
requested by the Company, such Purchaser shall have furnished the Company with
an opinion of counsel, reasonably satisfactory to the Company, that such
disposition will not require registration under the 1933 Act.

          (c) Notwithstanding the provisions of paragraphs (a) and (b) above, no
such registration statement or opinion of counsel shall be necessary for a
transfer by such Purchaser to a stockholder or partner (or retired partner) of
such Purchaser, or its affiliates, associates or partners, or transfers by gift,
will or intestate succession to any spouse or lineal descendants or ancestors,
if all transferees agree in writing to be subject to the terms hereof to the
same extent as if they were Purchasers hereunder.

Each Purchaser understands that the Securities are "restricted securities" under
the federal securities laws inasmuch as they are being acquired from the Company
in a transaction not involving a public offering and that under such laws and
applicable regulations such securities may be resold without registration under
the 1933 Act only in certain limited circumstances. In this connection, the
Purchaser represents that it is familiar with Rule 144 promulgated under the
1933 Act, as presently in effect, and understands the resale limitations imposed
thereby and by the 1933 Act.

     4.5. Accredited Investor. Each Purchaser is an "accredited investor" as
          -------------------
such term is defined in Rule 501 under the Securities Act.

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<PAGE>

5.   Conditions to Closing

Each Purchaser's obligation to make its portion of the Loan shall be subject to
satisfaction of the following conditions precedent:

     5.1. Opinion. Such Purchaser shall have received the written opinion of
          -------
Brobeck Phleger & Harrison LLP, counsel to the Company.

     5.2. Certificate. Each other Purchaser shall have concurrently performed
          -----------
its obligations hereunder, and Centennial Fund V, L.P.'s obligation is subject
to its receipt of certification from the Company with respect to interests of
certain disqualified persons.

6.   Miscellaneous

     6.1. Binding Agreement. The terms and conditions of this Agreement shall
          -----------------
inure to the benefit of and be binding upon the respective successors and
assigns of the parties. Nothing in this Agreement, express or implied, is
intended to confer upon any third party any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

     6.2. Governing Law. This Agreement shall be governed by and construed under
          -------------
the laws of the State of Colorado as applied to agreements among Colorado
residents, made and to be performed entirely within the State of Colorado.

     6.3. Counsel Fees. The Company agrees to reimburse the fees (up to a
          ------------
maximum of $5,000) and expenses of Holland & Hart LLP, legal counsel to the
Purchasers in connection with the transactions contemplated hereby.

     6.4. Counterparts. This Agreement may be executed in two or more
          ------------
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

     6.5. Titles and Subtitles. The titles and subtitles used in this Agreement
          --------------------
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

     6.6. Notices. Any notice required or permitted under this Agreement shall
          -------
be given in writing and shall be deemed effectively given upon personal delivery
or upon deposit with the United States Post Office, by registered or certified
mail, postage prepaid, addressed to the Company at 5777 Central Avenue, Boulder,
Colorado 80301, or to a Purchaser at its address shown on the Schedule of
Purchasers, or at such other address as such party may designate by ten (10)
days advance written notice to the other party.

     6.7. Modification; Waiver. Any term of this Agreement may be amended and
          --------------------
the observance of any term of this Agreement may be waived (either generally or
in a particular instance and either retroactively or prospectively), with the
written consent of the Company and the holders of Notes representing a majority
of the outstanding aggregate principal amount of the Notes. Any waiver or
amendment effected in accordance with this Section 6.7 shall be binding

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upon each holder of any securities purchased under this Agreement at the time
outstanding (including securities into which such securities have been
converted) and each future holder of all such securities and the Company.

                                       5
<PAGE>

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first written above.

COMPANY:                                PURCHASERS:

VSTREAM INCORPORATED                    CENTENNIAL FUND V, L.P.

                                        By:  Centennial Holdings V, L.P.,
By: /s/                                 Its General Partner
   ----------------------------
Title: Chief Financial Officer
       -------------------------
                                             By: /s/ Donald H. Parsons, Jr.
                                                ---------------------------
                                                 a General Partner

                                        CENTENNIAL ENTREPRENEURS FUND V, L.P.

                                        By:  Centennial Holdings V, L.P.
                                        Its General Partner

                                             By: /s/ Donald H. Parsons, Jr.
                                                ---------------------------
                                             Title: A General Partner
                                                   --------------------

                                        SOFTBANK TECHNOLOGY VENTURES IV L.P.

                                        By:  STV IV LLC

                                        By: /s/ Brad Feld
                                           ----------------------------
                                           Managing Director

                                        SOFTBANK TECHNOLOGY ADVISORS FUND L.P.

                                        By:  STV IV LLC

                                        By: /s/ Brad Feld
                                           ----------------------------
                                           Managing Director

                                       6

<PAGE>

                             SCHEDULE OF PURCHASERS
                             ----------------------
<TABLE>
<CAPTION>

                                           CONVERTIBLE        SERIES C     SERIES C STOCK
                                           SUBORDINATED        STOCK          WARRANT          TOTAL
            PURCHASER                         NOTES           WARRANTS         PRICE       PURCHASE PRICE

<S>                                        <C>                <C>          <C>             <C>
Centennial Fund V, L.P                      $242,500            5829          $  5.83       $242,505.83
1428 15th Street
Denver, CO 80202

Centennial Entrepreneurs                       7,500             180              .18          7,500.18
          Fund V, L.P.
1428 15th Street
Denver, CO 80202

SOFTBANK Technology                          245,000            5889             5.89        245,005.89
    Ventures IV L.P.
c/o Bradley Feld
333 W. San Carlos Road, Suite 1225
San Jose, CA 95510

SOFTBANK Technology Advisors                   5,000             120              .12          5,000.12
     Fund L.P.
c/o Bradley Feld
333 W. San Carlos Road, Suite 1225
San Jose, CA 95510
                                      ----------------------------------------------------------------------
TOTAL                                       $500,000          12,018            12.02       $500,012.02
</TABLE><PAGE>

                                                                   EXHIBIT 10.13

                                     LEASE
                                     -----

  1.  PARTIES.  This Lease, dated, for reference purposes only, March 3, 1997 is
made by and between BMC PROPERTIES,LLC (herein called "Landlord") and
INTELLISTAT MEDIA RESEARCH, INC. (herein called "Tenant").

  2.  PREMISES.  Landlord does hereby lease to Tenant and Tenant hereby leases
from Landlord that certain office space (herein called "Premises") indicated on
Exhibit A attached hereto and by reference thereto made a part hereof, said
Premises being agreed, for the purposes of this Lease, to have an area of
approximately 4,295 square feet (including a pro rata share of the common areas)
and being situated on the FIRST FLOOR of that certain building known as THE
LAKESHORE BUILDING ("Building"), 5777 Central Avenue, Boulder, Colorado 80301.
Said Lease is subject to the terms, covenants and conditions herein set forth
and the Tenant covenants as a material part of the consideration for this Lease
to keep and perform each and all of said terms, covenants and conditions by it
to be kept and performed and that this Lease is made upon the condition of said
performance.

  3.  TERM.  The term of this Lease shall be for three (3) years.  This lease
shall commence on the 1st day of June, 1997("Commencement Date"), and end on the
31st day of May, 2000.

  4.  POSSESSION.

      a.  If the Landlord cannot deliver possession of the Premises to Tenant at
the commencement of the term hereof, this Lease shall not be void or voidable,
the expiration date of the above term shall be extended, to three (3) years
after the end of the month during which Landlord delivers possession to Tenant
and all rent shall be abated during the period between the commencement date and
the time when Landlord delivers possession. Notwithstanding anything to the
contrary contained in this section 4(a), in the event that Landlord has not
delivered possession of the Premises to Tenant, for any reason whatsoever, on or
prior to ninety (90) days after the commencement date set forth in Section 3(a)
above, then Tenant may terminate this Lease upon written notice to Landlord and
neither party shall thereafter have any obligations or liability under this
Lease. Nothing in the contrary shall relieve Landlord of its obligation to use
its best efforts to complete the Tenant Improvements and to deliver possession
of the Premises to Tenant on or before the commencement date set forth in
Section 3(a) above. In the event that this Lease is terminated pursuant to this
Section 4(a), Landlord shall promptly return to Tenant the first month's rent
and security deposit prepaid pursuant to Section 5(a) below.

      b.  In the event that Landlord shall permit Tenant to occupy the Premises
prior to the commencement date of the term, such occupancy shall be subject to
all the provisions of the Lease.  Said early possession shall not advance the
termination date herein above provided.  Notwithstanding the foregoing, in the
event that Landlord permits Tenant to enter the Premises prior to completion of
the Tenant Improvements solely for the purposes of performing Tenant's pre-
opening activities, Tenant shall not be obligated to pay Rent while Tenant is
performing such pre-opening activities.

  5.  RENT.

      a.  Tenant agrees to pay to Landlord as basic rental, without prior notice
or demand, the sum of FOUR THOUSAND TWO HUNDRED NINETY-FIVE AND NO/100 Dollars
($4,295.00), on or before the first day of the first full calendar month of the
term hereof and a like sum on or before the first day of each and every
successive calendar month thereafter during the term hereof, except that the
first month's rent shall be paid upon the execution hereof. Rent for any period
during the term hereof which is for less than one (1) month shall be a prorated
portion of the monthly installment herein, based upon a thirty (30) day month.
Said rental shall be paid to Landlord, without deduction or offset in lawful
money of the United States of America, which shall be legal tender at the time
of payment at 3434 47th Street, Suite 220, Boulder, Colorado 80301, or to such
other person or at such other place as Landlord may from time to time designate
in writing.
<PAGE>

      b.  On the first day of the month following the end of a Lease year
Landlord may increase the basic rental payable for the subsequent twelve (12)
month period. The increase shall be measured by the increase in the Consumer
Price Index, as described below, but shall not exceed five percent (5%) of the
basic rental owing for the immediately preceding year ("the 5% Cap"). The
following definitions and methods shall be used to calculate the increases in
basic rental under this paragraph:

          (1)  "Consumer Price Index" shall mean the semi-annual indexes of the
Consumer Price Index for all Urban Consumers, Denver-Boulder, Colorado (All
items; 1982-84 equals 100) issued by the United States Department of Labor,
Bureau of Labor Statistics, or any successor agency of the United States that
issues such indexes or any successor index.

          (2)  "Initial Consumer Price Index" shall mean the Consumer Price
Index published for the nearest calendar period preceding the Commencement Date
of this Lease.

          (3)  "Latest Consumer Price Index" shall mean the Consumer Price Index
published for the nearest calendar period preceding the first day on which an
increase under this Lease is to be effective.

          (4)  "Previous Consumer Price Index" shall mean the Consumer Price
Index published for the nearest calendar period preceding the first day on which
the previous increase under this Lease was effective.

          (5)  The first increase will be calculated by multiplying the basic
rental by a fraction, with the numerator being the Latest Consumer Price Index
and the denominator being the Initial Consumer Price Index.

          (6)  Each subsequent increase will be calculated by multiplying the
then current basic rental by a fraction, with the numerator being the Latest
Consumer Price Index and the denominator being the Previous Consumer Price
Index.

          (7)  To the extent that the calculation under subparagraphs (5) and
(6) above exceed the 5% Cap, such excess ("Excess") shall be preserved and
carried forward to subsequent years until utilized. All or part of the Excess
may be added to the amount calculated under subparagraph (6) above for any
subsequent year, subject to the 5% Cap.

          (8)  If the Consumer Price Index is discontinued, Landlord will
designate an alternative comparable index to be used in calculating the increase
in the basic rental under this Lease.

          (9)  Tenant will not be entitled to a credit for any decrease in the
Consumer Price Index except to the extent that it shall be off-set against any
Excess carried forward under the provisions of paragraph 5(b)(7).

      c.  Notwithstanding any provision contained herein, the basic monthly
rental due under the terms hereof shall at no time be less than FOUR THOUSAND
TWO HUNDRED NINETY-FIVE AND NO/100 Dollars ($4,295.00).

  6.  SECURITY DEPOSIT.  Tenant has deposited with Landlord the sum of FIVE
THOUSAND SEVEN HUNDRED TWENTY-SEVEN AND NO/100 Dollars ($5,727.00).  Said sum
shall be held by Landlord as security for the faithful performance by Tenant of
all the terms, covenants, and conditions of this Lease to be kept and performed
by Tenant during the term hereof. If Tenant defaults with respect to any
provision of this Lease, including, but not limited to the provisions relating
to the payment of rent, Landlord may (but shall not be required to) use, apply
or retain all or any part of this security deposit for the payment of any rent
or any other sum in default, or for the payment of any amount which Landlord may
spend or become obligated to spend by reason of Tenant's default, or to
compensate Landlord for any other loss or damage which Landlord may suffer by
reason of Tenant's default.  If any portion of said deposit is so used or
applied, Tenant

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<PAGE>

shall within five (5) days after written demand therefor, deposit cash with
Landlord in an amount sufficient to restore the security deposit to its original
amount and Tenant's failure to do so shall be a material breach of this Lease.
Landlord shall not be required to keep this security deposit separate from its
general funds, and Tenant shall not be entitled to interest on such deposit. If
Tenant shall fully and faithfully perform every provision of this Lease to be
performed by it, the security deposit or any balance thereof shall be returned
to Tenant (or at Landlord's option, to the last assignee of Tenant's interest
hereunder) at the expiration of the Lease term. In the event of termination of
Landlord's interest in this Lease, Landlord shall transfer said deposit to
Landlord's successor in interest.

  7.  OPERATING EXPENSES.  For the purposes of this Article, operating expenses
means all reasonable and necessary costs and expenses of every kind and nature,
other than those expressly excluded below, paid or incurred by Landlord in
operating, managing, repairing, maintaining and administering the Building
including, without limitation or duplication:

      a.  The cost of all insurance required to be kept by Landlord pursuant to
this Lease and any other insurance customarily procured for other commercial
buildings in the same geographical area as the Building and which Landlord may
reasonably elect to obtain with respect to the operation or ownership of the
Property and the part of any claim required to be paid under the deductible
portion of any insurance policies carried by Landlord in connection with the
Property.

      b.  The cost of reasonable and necessary general repairs, maintenance and
replacements, excluding capital expenditures, made from time to time by Landlord
to the Property, including costs under mechanical or other maintenance contracts
and repairs and replacements of equipment used in connection with such
maintenance and repair work.

      c.  The cost of pest control, security, cleaning and snow and ice removal
services.

      d.  The cost of maintaining, repairing, redecorating, renovating,
replacement of floor coverings of common areas, and landscaping the Common
Facilities, and of maintaining and operating any fire detection, fire
prevention, lighting and communications systems. Redecorating, renovating and
replacement of floor coverings of common areas shall be charged to operating
expenses as provided in subparagraph i. of this paragraph.

      e.  The cost of all utilities (including, without limitation, water,
sewer, gas and electricity) used or consumed.

      f.  The cost of providing heating, ventilating and cooling to the interior
portions of the Building.

      g.  Remuneration (including wages, usual expense accounts and fringe
benefits, costs to Landlord of workmen's compensation and disability insurance
and payroll taxes) and fees of persons and companies to the extent directly
engaged in operating, managing, repairing, maintaining, or administering the
Property.

      h.  The cost of professional property management fees, supplying any on-
site manager with necessary office space, office equipment and supplies in the
Building, and costs incurred by Landlord or its agents in engaging accountants
or other consultants to assist in making the computations required hereunder.

      i.  The cost of capital improvements and structural repairs and
replacements made in, on or to the Property that are [i] made in order to
conform to changes subsequent to the Commencement Date in any applicable laws,
ordinances, rules, regulations or orders of any governmental or quasi-
governmental authority having jurisdiction over the Property, or [ii] designed
primarily to reduce Operating Expenses or the rate of increase in Operating
Expense, [iii] redecoration, renovating and replacement of floor coverings; such
costs shall be charged Landlord to Operating Expense in equal annual
installments over the useful life of such capital improvement or structural
repair or replacement (as reasonably determined by Landlord) together with
interest on

                                       3
<PAGE>

the balance of the unreimbursed cost at 4% above the Prime Rate charged by Bank
One, Colorado, N.A. in Boulder on the date the cost was incurred by Landlord.

      j.  Real property taxes and assessments, gross receipts, taxes (whether
assessed against the Landlord or assessed against the Tenant and collected by
the Landlord, or both).  Tenant shall not be responsible to pay any fines, late
charges or penalties assessed against Landlord as a result of Landlord's failure
to timely pay such taxes and assessments.

      k.  Other costs and expenses, including supplies, not otherwise expressly
excluded hereunder attributable to the operation, management, repair,
maintenance and administration of the Property.

      l.  A reserve for replacement of heating, ventilating and air-conditioning
equipment, replacement of the roof, and parking lot of THIRTY THOUSAND and
NO/100 Dollars ($30,000.00) per annum.

  Operating Expenses shall not, however, include the following:

      m.  Any charge for depreciation of the Building or equipment and any
principal, interest or other finance charge.

      n.  The cost of any work, including painting, decorating and work in the
nature of tenant finish, which Landlord performs in any Rentable Premises other
than work which Landlord performs in the Premises.

      o.  The cost of repairs, replacements or other work occasioned by insured
casualty or defects in construction or equipment to the extent such cost is
reimbursed to Landlord (or not charged to Landlord) by reason of collected
insurance proceeds (using Landlord's good faith efforts to collect such
proceeds) or any contractors', manufacturers' or suppliers' warranties.

      p.  Expenditures required to be capitalized for federal income tax
purposes (except as provided in Article 7, paragraph d. and i.).

      q.  Leasing commissions, advertising expenses and other costs incurred in
leasing space in the Building except as otherwise expressly provided in this
Lease.

      r.  The cost of repairing or rebuilding necessitated by condemnation.

      s.  The cost of any damage to the Property or any settlement, payment or
judgment incurred by Landlord, resulting in neither case from Landlord's
tortious act, neglect or breach of this Lease that is not covered by insurance
proceeds.

      t.  Costs (including, without limitation, attorneys fees) incurred by
Landlord in attempting to collect rent or evict tenants (other than Tenant) from
the Building.

      u.  Costs, including, without limitation, any penalties, fines and legal
expenses incurred by Landlord or any other tenant in the Building as a result of
a violation of any federal, state or local law, code or regulation.

      Tenant shall pay 7.7882% of Operating Expenses paid or incurred by the
Landlord for the operation or maintenance of the Building of which the Premises
are a part. This percentage is calculated as Tenant's pro-rata share of such
Operating Expenses based upon the assumption of a 95% occupancy rate and a total
net rentable area of 58,050 square feet. Upon commencement of this Lease,
Landlord shall give Tenant a statement of the amount of Operating Expenses
payable by Tenant with each payment of rent, which shall be based upon a best
estimate of such expenses if no record of actual expenses for the prior year are
available. Landlord shall endeavor to give to Tenant on or before the first day
of March of each year thereafter an itemized statement of the prior year's
Operating Expenses payable by Tenant hereunder and advise Tenant of any increase
in Operating

                                       4
<PAGE>

Expenses, but failure by Landlord to give such statement by said date shall not
constitute a waiver by Landlord of its right to require an increase in Operating
Expenses. The total amount of actual Operating Expenses for the prior year shall
be used as an estimate for current year and this amount shall be divided into
twelve (12) equal monthly installments, and Tenant shall pay to Landlord,
concurrently with the regular monthly rent payment next due following the
receipt of such statement, an amount equal to one (1) monthly installment
multiplied by the number of months from January in the calendar year in which
said statement is submitted to the month of such payment. Subsequent
installments shall be payable concurrently with the regular monthly rent
payments for the balance of that calendar year and shall continue until the next
year's statement is rendered. If actual Operating Expenses are more than
estimated, then upon receipt of a statement from Landlord, Tenant shall pay a
lump sum equal to such total increase with the next succeeding regular monthly
rent payment. Tenant or its representative shall have the right to inspect
Landlord's books and records relating to the Operating Expenses during normal
business hours.

      Even though the term has expired and Tenant has vacated the Premises, when
the final determination is made of Tenant's share of Operating Expenses for the
year in which this Lease terminates, Tenant shall immediately pay any increase
due over the estimated expenses paid and, conversely, if at any time an
overpayment made in the event said expenses decrease shall be immediately
rebated by Landlord to Tenant or credited to future operating expenses at
Landlord's option.

  8.  USE. Tenant shall use the Premises for TELECOMMUNICATIONS, HARDWARE AND
SOFTWARE DEVELOPMENT and shall not use or permit the Premises to be used for any
other purpose without the prior written consent of Landlord.

      Tenant shall not do or permit anything to be done in or about the Premises
nor bring or keep anything therein which will in any way increase the existing
rate or affect any fire or other insurance upon the Building or any of its
contents, or cause cancellation of any insurance policy covering said Building
or any part thereof or any of its contents. Tenant shall not do or permit
anything to be done in or about the Premises which will, in any way, obstruct or
interfere with the rights of other tenants or occupants of the Building or
injure or annoy them or use or allow the Premises to be used for any improper,
immoral, unlawful or objectionable purpose, nor shall Tenant cause, maintain or
permit any nuisance in, on or about the Premises. Tenant shall not commit or
suffer to be committed any waste in or upon the Premises.

  9.  COMPLIANCE WITH LAW.  Tenant shall not use the Premises or permit anything
to be done in or about the Premises which will, in any way, conflict with any
law, statute, ordinance or governmental rule or regulation now in force or which
may hereafter be enacted or promulgated. Tenant shall, at its sole cost and
expense, promptly comply with all laws, statutes, ordinances and governmental
rules, regulations or requirements now in force or which may hereafter be in
force, and with the requirements of any board of fire insurance underwriters or
other similar bodies now or hereafter constituted, relating to, or affecting the
condition, use or occupancy of the Premises, excluding structural changes not
related to or affected by Tenant's improvements or acts.  The judgment against
Tenant, whether the Landlord be a party thereto or not, that Tenant has violated
any law, statute, ordinance or governmental rule, regulation or requirement,
shall be conclusive of that fact as between the Landlord and Tenant.

  10. ALTERATIONS AND ADDITIONS.  Tenant shall not make or suffer to be made
any alterations, additions or improvements to or of the Premises or any part
thereof without the written consent of Landlord first had and obtained, which
will not be unreasonably withheld, conditioned or delayed, and any alterations,
additions or improvements to or of said Premises, including, but not limited to,
wall covering, paneling and built-in cabinet work, but excepting movable
furniture and trade fixtures, shall, on the expiration of the term, become a
part of the realty and belong to the Landlord and shall be surrendered with the
Premises.  In the event Landlord consents to the making of any alterations,
additions or improvements to the Premises by Tenant, the same shall be made by
Tenant at Tenant's sole cost and expense, and any contractor or person selected
by Tenant to make the same, must first be approved of in writing by the
Landlord, which will not be unreasonably withheld, conditioned or delayed.  Upon
the expiration or earlier

                                       5
<PAGE>

termination of the term hereof, Tenant shall, upon the written demand by the
Landlord, given at least thirty (30) days prior to the end of the term, at
Tenant's sole cost and expense, forthwith and with all due diligence, remove any
alterations, additions, or improvements made which have been designated by the
Landlord to be removed, and repair any damage to the Premises caused by such
removal.

  11. REPAIRS.

      a. Subject to Tenant's right to inspect the Premises prior to occupancy
thereof and submit a "Punch List" to Landlord in accordance with Paragraph 32 of
this Lease, by taking possession of the Premises, Tenant shall be deemed to have
accepted the Premises as being in good, sanitary order, condition and repair.
Tenant shall, at Tenant's sole cost and expense, keep the Premises and every
part thereof in good condition and repair, damage thereto from causes beyond the
reasonable control of Tenant and ordinary wear and tear excepted. Tenant shall,
upon the expiration or sooner termination of this Lease hereof, surrender the
Premises to the Landlord in good condition, ordinary wear and tear and damage
from causes beyond the reasonable control of Tenant excepted. Except as
specifically provided in an addendum, if any, to this Lease, Landlord shall have
no obligation whatsoever to alter, remodel, improve, repair, decorate or paint
the Premises or any part thereof, and the parties hereto affirm that Landlord
has made no representations to Tenant respecting the condition of the Premises
or the Building except as specifically herein set forth.

      b. Landlord shall repair and maintain the structural portions of the
Building, including the roof, basic plumbing, air conditioning, heating, and
electrical and sprinkler systems installed or furnished by Landlord, unless such
maintenance and repairs are caused in part or in whole by the act, neglect,
fault or omission of any duty by the Tenant, its agents, servants, employees or
invitees, in which case Tenant shall pay to Landlord the reasonable cost of such
maintenance and repairs.  The cost of all such repairs (except repairs of
structural defects) shall be included in Operating Expenses as provided in
Article 7 hereof.  Landlord shall not be liable for any failure to make any such
repairs or to perform any maintenance unless such failure shall persist for an
unreasonable time after written notice of the need of such repairs or
maintenance is given to Landlord by Tenant.  Except as provided in Article 22
hereof, there shall be no abatement of rent and no liability of Landlord by
reason of any injury to or interference with Tenant's business arising from the
making of any repairs, alterations or improvements in or to any portion of the
Building or the Premises or in or to fixtures, appurtenances and equipment
therein.  Except in the event of an emergency, Tenant waives the right to make
repairs at Landlord's expense under any law, statute or ordinance now or
hereafter in effect.

  12. LIENS.  Tenant shall keep the Premises and the property in which the
Premises are situated free from any liens arising out of any work performed,
materials furnished or obligations incurred by Tenant.  Landlord may require, at
Landlord's sole option, that Tenant shall provide to Landlord, at Tenant's sole
cost and expense, a lien and completion bond or other security reasonably
acceptable to Landlord in an amount equal to one and one-half (1-1/2) times any
and all estimated cost of improvements, additions, or alterations in the
Premises, to insure Landlord against any liability for mechanics' and
materialmen's liens and to insure completion of the work.

  13. ASSIGNMENT AND SUBLETTING.  Except as expressly provided below,Tenant
shall not either voluntarily or by operation of law, assign, transfer, mortgage,
pledge, hypothecate or encumber this Lease or any interest therein, and shall
not sublet the said Premises or any part thereof, or any right or privilege
appurtenant thereto, or suffer any other person (the employees, agents, servants
and invitees of Tenant excepted) to occupy or use the said Premises, or any
portion thereof, without the written consent of Landlord first had and obtained,
which consent shall not be unreasonably withheld, conditioned or delayed, and a
consent to one assignment, subletting, occupation or use by any other person
shall not be deemed to be a consent to any subsequent assignment, subletting,
occupation or use by another person.  Any such assignment or subletting without
such consent shall be void, and shall, at the option of the Landlord, constitute
a default under this Lease.  Tenant may, upon written notice to Landlord, but
without the consent of Landlord, (i) transfer (by assignment or sublease, in

                                       6
<PAGE>

whole or in part) this Lease to any parent or affiliate of Tenant or to a wholly
owned subsidiary of Tenant, or (ii) transfer (by assignment or sublease, in
whole or in part) this Lease to any person or entity acquiring, by asset or
stock purchase, merger, consolidation or liquidation, all or substantially all
of Tenant's assets or voting stock, provided that such person or entity assumes
in writing the obligations of Tenant under this Lease.

  14. HOLD HARMLESS.  Tenant shall indemnify and hold harmless Landlord against
and from any and all claims arising from Tenant's use of the Premises for the
conduct of its business or from any activity, work, or other thing done,
permitted or suffered by the Tenant in or about the Building, and shall further
indemnify and hold harmless Landlord against and from any and all claims arising
from any breach or default in the performance of any obligation on Tenant's part
to be performed under the terms of this Lease, or arising from any act or
negligence of the Tenant, or any officer, agent, employee, guest, or invitee of
Tenant, and from all and against all costs, reasonable attorneys' fees, expenses
and liabilities incurred in or about any such claim or any action or proceeding
brought thereon, and, in any case, action or proceeding be brought against
Landlord by reason of any such claim, Tenant, upon notice from Landlord shall
defend the same at Tenant's expense.  Tenant, as a material part of the
consideration to Landlord, hereby assumes all risk of damage to property or
injury to persons, in, upon or about the Premises, from any cause other than
Landlord's negligence or willful acts.  Landlord or its agents shall not be
liable for any damage to property entrusted to employees of the Building, nor
for loss or damage to any property by theft or otherwise, nor for any injury to
or damage to persons or property resulting from fire, explosion, falling
plaster, steam, gas, electricity, water or rain which may leak from any part of
the Building or from the pipes, appliances or plumbing works therein or from the
roof, street or subsurface or from any other place resulting from dampness or
any other cause whatsoever, unless caused by or due to the negligence of
Landlord, its agents, servants or employees.  Landlord or its agents shall not
be liable for interference with the light or other incorporeal hereditament,
loss of business by Tenant, nor shall Landlord be liable for any latent defects
in the Premises or in the Building.  Tenant shall give prompt notice to Landlord
in case of fire or accidents in the Premises or in the Building or of defects
therein or in the fixtures or equipment.

  15. SUBROGATION.  As long as their respective insurers so permit, Landlord
and Tenant hereby mutually waive their respective rights of recovery against
each other for any loss insured by fire, extended coverage and other property
insurance policies existing for the benefit of the respective parties.  Each
party shall obtain any special endorsements, if required by their insurer to
evidence compliance with the aforementioned waiver.  If one party is unable to
obtain a waiver of subrogation, the other party is not required to maintain
same.

  16. LIABILITY INSURANCE.  Tenant shall, at Tenant's expense, obtain and keep
in force during the term of this Lease a policy of comprehensive public
liability insurance with limits not less than $2,000,000, combined single limit,
insuring Landlord and Tenant against any liability arising out of the ownership,
use, occupancy or maintenance of the Premises and all areas appurtenant thereto,
as their interests may appear.  The limit of said insurance shall not, however,
limit the liability of the Tenant hereunder.  Tenant may carry said insurance
under a blanket policy, providing, however, said insurance by Tenant shall have
a Landlord's protective liability endorsement attached thereto.  If Tenant shall
fail to procure and maintain said insurance, Landlord may, but shall not be
required to, procure and maintain same, but at the expense of Tenant after
notifying Tenant and allowing ten (10) business days.  Tenant shall deliver to
Landlord prior to occupancy of the Premises certificates evidencing the
existence and amounts of such insurance with named insured as their interests
may appear.  No policy shall be cancelable or subject to reduction of coverage
except after thirty (30) days' prior written notice to Landlord.

  17. SERVICES AND UTILITIES.  Provided that Tenant is not in default
hereunder, Landlord agrees to furnish to the Premises during reasonable hours of
generally recognized business days, to be determined by Landlord at its sole
discretion, and subject to the rules and regulations of the Building of which
the Premises are a part, electricity for normal lighting and fractional
horsepower office machines, heat and air conditioning required in Landlord's
judgment for the comfortable use and occupation of the Premises.  Landlord shall
also maintain and keep lighted the common stairs, common entries and toilet
rooms in the Building of which the Premises are a part.  Landlord shall not be
liable for, and Tenant shall not be entitled to, any reduction of rental by
reason of Landlord's failure to furnish any of the foregoing when such failure
is caused by accident,

                                       7
<PAGE>

breakage, repairs, strikes, lockouts or other labor disturbances or labor
disputes of any character, or by any other cause, similar or dissimilar, beyond
the reasonable control of Landlord. Landlord shall not be liable under any
circumstances for a loss or injury to property, however occurring, through or in
connection with or incidental to failure to furnish any of the foregoing, except
as to Landlord's negligence or willful acts. Wherever heat generating machines
or equipment are used in the Premises which affect the temperature otherwise
maintained by the air conditioning system, Landlord reserves the right to
install supplementary air conditioning units in the Premises and the cost
thereof, including the cost of installation, and the cost of operation and
maintenance thereof shall be paid by Tenant to Landlord upon demand by Landlord.

      Tenant will not, without written consent of Landlord, use any apparatus or
device in the Premises, including, but without limitation thereto, electronic
data processing machines, punch card machines, and machines using in excess of
120 volts, which will in any way increase the amount of electricity usually
furnished or supplied for the use of the Premises as general office space; nor
connect with electric current except through existing electrical outlets in the
Premises, any apparatus or device, for the purpose of using electric current.
If Tenant shall require water or electric current in excess of that usually
furnished or supplied for the use of the Premises as general office space,
Tenant shall first procure the written consent of Landlord, which Landlord may
not unreasonably refuse, to the use thereof and Landlord may cause a water meter
or electrical current meter to be installed in the Premises, so as to measure
the amount of water and electric current consumed for any such use.  The cost of
any such meters and of installation, maintenance and repair thereof shall be
paid for by the Tenant and Tenant agrees to pay to Landlord promptly upon demand
therefor by Landlord for all such water and electric current consumed as shown
by said meters at the rates charged for such services by the local public
utility furnishing the same, plus any additional expense incurred in keeping
account of the water and electric current so consumed.  If a separate meter is
not installed, such excess cost for such water and electric current will be
established by an estimate made by a utility company or electrical engineer.

      Notwithstanding the foregoing, if any essential service to be provided is
interrupted or curtailed for a period of forty-eight (48) hours and is caused by
Landlord or lies within Landlord's control, in addition to other remedies
available to Tenant, the Rent (inclusive of all payments) for the Premises shall
completely abate from such forty-eight (48) hour period and continue until such
services are fully restored.  Landlord shall provide a minimum of seventy-two
(72) hours' prior written notice of any planned interruption of services in
connection with the repair and maintenance of the Premises or the Building.

  18. PROPERTY TAXES.  Tenant shall pay, or cause to be paid, before
delinquency, any and all taxes levied or assessed and which become payable
during the term hereof upon all Tenant's leasehold improvements, equipment,
furniture, fixtures and personal property located in the Premises; except that
which has been paid for by Landlord, and is the standard of the Building.  In
the event any or all of Tenant's leasehold improvements, equipment, furniture,
fixtures and personal property shall be assessed and taxed with the Building,
Tenant shall pay to Landlord its share of such taxes within thirty (30) days
after receipt by Tenant from Landlord of a statement in writing setting forth
the amount of such taxes applicable to Tenant's property which statement shall
include a copy of the tax bill.

  19. RULES AND REGULATIONS.  Tenant shall faithfully observe and comply with
the non-discriminatory rules and regulations that Landlord shall, from time to
time, promulgate.  Landlord reserves the right, from time to time, to make all
reasonable modifications to said rules.  The additions and modifications to
those rules shall be binding upon Tenant upon delivery of a copy of them to
Tenant.  Landlord shall not be responsible to Tenant for the nonperformance of
any said rules by any other tenants or occupants.  A copy of the current rules
and regulations are attached hereto as Exhibit B.

  20. HOLDING OVER.  If Tenant remains in possession of the Premises or any
part after the expiration of the term hereof, without the express written
consent of Landlord, such occupancy shall be a tenancy from month-to-month at a
rental in the amount of one and one-half times the last

                                       8
<PAGE>

monthly rental, plus all other charges payable hereunder, and upon all the terms
hereof applicable to a month-to-month tenancy.

  21. ENTRY BY LANDLORD.  Landlord reserves, and shall during normal business
hours upon reasonable written notice to Tenant and subject to Tenant's security
requirements, as herein defined, have the right to enter the Premises, inspect
the same, supply janitorial service and any other service to be provided by
Landlord to Tenant hereunder, to submit said Premises to prospective purchasers
or during the last six months of the term to prospective tenants, to post
notices of non-responsibility, and to alter, improve or repair the Premises and
any portion of the Building of which the Premises are a part that Landlord may
deem necessary or desirable, without abatement of rent and may for that purpose
in connection with any work to be performed by Landlord under this Lease,
Landlord may erect scaffolding and other necessary structures where reasonably
required by the character of the work to be performed, always providing that the
entrance to the Premises shall not be blocked thereby, and further providing
that the business of the Tenant shall not be interfered with unreasonably.
Tenant hereby waives any claim for damages or for any injury or inconvenience to
or interference with Tenant's business, any loss of occupancy or quiet enjoyment
of the Premises, and any other loss occasioned thereby unless caused by
negligence or willful acts of Landlord.  For each of the aforesaid purposes,
Landlord shall, at all times, have and retain a key with which to unlock all of
the doors in, upon and about the Premises, excluding Tenant's vaults, safes and
files and locked documentation room, as defined in Paragraph 31, and Landlord
shall have the right to use any and all means which Landlord may deem proper to
open said doors in an emergency, in order to obtain entry to the Premises
without liability to Tenant except for any failure to exercise due care for
Tenant's property.  Any entry to the Premises obtained by Landlord by any of
said means, or otherwise shall not, under any circumstances, be construed or
deemed to be a forcible or unlawful entry into, or a detainer of, the Premises,
or an eviction of Tenant from the Premises or any portion thereof.

  22. RECONSTRUCTION.  In the event the Premises, or the Building of which the
Premises are a part, are damaged by fire or other perils covered by extended
coverage insurance, Landlord agrees to forthwith repair the same to
substantially the same condition as existed immediately prior to such damage;
and this Lease shall remain in full force and effect, except that the Tenant
shall be entitled to a proportionate reduction of the rent while such repairs
are being made, such proportionate reduction to be based upon the extent to
which the damage and the making of such repairs shall materially interfere with
the business carried on by the Tenant in the Premises.  If the damage is due to
the fault or neglect of Tenant or its employees, there shall be no abatement of
rent.

      In the event the Premises or the Building of which the Premises are a part
are damaged as a result of any cause other than the perils covered by fire and
extended coverage insurance, then Landlord shall forthwith repair the same
within one hundred and fifty (150) days of casualty, provided the extent of the
destruction be less than ten percent (10%) of the then full replacement cost of
the Premises or the Building of which the Premises are a part. In the event the
destruction of the Premises or the Building is to an extent greater than ten
percent (10%) of the full replacement cost, then Landlord shall have the option:
(1) to repair or restore such damage, this Lease continuing in full force and
effect, but the rent to be proportionately reduced as hereinabove in this
Article provided; or (2) give notice to Tenant at any time within thirty (30)
days after such damage terminating this Lease as of the date specified in such
notice, which date shall thirty (30) days after the giving of such notice. In
the event of giving such notice, this Lease shall expire and all interest of the
Tenant in the Premises shall terminate on the date so specified in such notice
and the Rent, reduced by a proportionate amount, based upon the extent, if any,
to which such damage materially interfered with the business carried on by the
Tenant in the Premises, shall be paid up to date of said such termination.
Notwithstanding anything to the contrary contained in this Article, Landlord
shall not have any obligation whatsoever to repair, reconstruct or restore the
Premises when the damage resulting from any casualty covered under this Article
occurs during the last twelve (12) months of the term of this Lease or any
extension thereof and in the event of such casualty during the last twelve (12)
months of the term of this Lease either Landlord or Tenant shall have the right
to terminate this Lease by giving written notice to the other party within
thirty (30) days of such casualty.

                                       9
<PAGE>

      Landlord shall not be required to repair any injury or damage by fire or
other cause, or to make any repairs or replacements of any panels, decoration,
office fixtures, railings, floor coverings, partitions, or any other property
installed in the Premises by Tenant unless covered by Landlord's insurance as
part of the building.

      The Tenant shall not be entitled to any compensation or damages from
Landlord for loss of the use of the whole or any part of the Premises, Tenant's
personal property or any inconvenience or annoyance occasioned by such damage,
repair, reconstruction or restoration unless caused by Landlord.

  23. DEFAULT.  The occurrence of any one or more of the following events shall
constitute a default and breach of this Lease by Tenant:

      a.   The vacating or abandonment of the Premises by Tenant, without
payment of rent.

      b.  The failure by Tenant to make any payment of rent or any other payment
required to be made by Tenant hereunder, as and when due, where such failure
shall continue for a period of ten (10) days after written notice thereof by
Landlord to Tenant.

      c.  The failure by Tenant to observe or perform any of the covenants,
conditions or provisions of this Lease to be observed or performed by the
Tenant, other than described in Article 23.b above, where such failure shall
continue for a period of thirty (30) days after written notice thereof by
Landlord to Tenant; provided, however, that if the nature of Tenant's default is
such that more than thirty (30) days are reasonably required for its cure, then
Tenant shall not be deemed to be in default if Tenant commences such cure within
said thirty (30) day period and thereafter diligently prosecutes such cure to
completion.

      d.  The making by Tenant of any general assignment or general arrangement
for the benefit of creditors; or the filing by or against Tenant of a petition
to have Tenant adjudged a bankrupt, or a petition of reorganization or
arrangement under any law relating to bankruptcy (unless, in the case of a
petition filed against Tenant, the same is dismissed within sixty [60] days); or
the appointment of a trustee or a receiver to take possession of substantially
all of Tenant's assets located at the Premises or of Tenant's interest in this
Lease, where possession is not restored to Tenant within thirty (30) days; or
the attachment, execution or other judicial seizure of substantially all of
Tenant's assets located at the Premises or of Tenant's interest in this Lease,
where such seizure is not discharged in thirty (30) days.

      e.  If Landlord is in default in the performance of any obligation under
this Lease on the part of Landlord to be performed and such default continues
for a period of thirty (30) days after Tenant's written notice to Landlord
specifying the nature of the default, then Tenant may exercise any right or
remedy it may possess at law or equity, which is not otherwise waived in this
Lease. If the default set forth in Tenant's notice cannot reasonably be cured
within thirty (30) days, then Landlord shall not be deemed to be in default if
(i) Landlord notifies Tenant in writing that it will cure the default, (ii)
commences to cure the default within such thirty (30)-day period, and (iii)
proceeds diligently and in good faith thereafter to cure such default and does
cure such default within a reasonable time.

  24. REMEDIES IN DEFAULT.  In the event of any such default or breach by
Tenant, Landlord may at any time thereafter, with or without notice or demand,
and without limiting Landlord in the exercise of a right or remedy which
Landlord may have by reason of such default or breach:

      a.  Terminate Tenant's right to possession of the Premises by any lawful
and peaceful means, in which case this Lease shall terminate and Tenant shall
immediately surrender possession of the Premises to Landlord. In such event
Landlord shall be entitled to recover from Tenant all damages incurred by
Landlord by reason of Tenant's default including, but not limited to, the cost
of recovering possession of the Premises; expenses of reletting, including
necessary and

                                      10
<PAGE>

reasonable expenses incurred in connection with renovation and alteration of the
Premises, reasonable attorneys' fees, any real estate commission actually paid;
the worth at the time of award by the court having jurisdiction thereof of the
amount by which the unpaid rent for the balance of the term after the time of
such award exceeds the amount of such rental loss for the same period that
Tenant proves could be reasonably avoided; that portion of the leasing
commission paid by Landlord and applicable to the unexpired term of the Lease.
Unpaid installments of rent or other sums shall bear interest from the date due
at the rate of twenty percent (20%) per annum. In the event Tenant shall have
abandoned the Premises without payment of rent, Landlord shall have the option
of (a) taking possession of the Premises and recovering from Tenant the amount
specified in this paragraph, or (b) proceeding under the provisions of the
following Article 24.b.

      b.  Maintain Tenant's right to possession, in which case this Lease shall
continue in effect whether or not Tenant shall have abandoned the Premises.  In
such event, Landlord shall be entitled to enforce all of Landlord's rights and
remedies under this Lease, including the right to recover the rent as it becomes
due hereunder.

      c.  Pursue any other remedy now or hereafter available to Landlord under
the laws or judicial decision of the State in which the Premises are located.

  25. EMINENT DOMAIN.  If more than twenty-five percent (25%) of the Premises
shall be taken or appropriated by any public or quasi-public authority under the
power of eminent domain, either party hereto shall have the right, at its
option, to terminate this Lease by giving written notice to the other party, and
Landlord shall be entitled to any and all income, rent, award, or any interest
therein whatsoever which may be paid or made in connection with such public or
quasi-public use or purpose, and Tenant shall have no claim against Landlord for
the value of any unexpired term of this Lease.  If either less than or more than
twenty-five percent (25%) of the premises is taken, or neither party elects to
terminate as herein provided, the rental thereafter to be paid shall be
proportionately reduced.  If more than ten percent (10%) of the Building other
than the Premises may be so taken or appropriated, Landlord shall have the right
at its option to terminate this Lease by giving thirty (30) days written notice
to Tenant and shall be entitled to the entire award as above provided.  Tenant
shall, however, have the right to pursue a separate claim for any damage
suffered as a result of such taking.

  26. ESTOPPEL STATEMENT.  Landlord and Tenant shall at any time and from time
to time upon not less than ten (10) business days' prior written notice from the
other party execute, acknowledge, and deliver to the other party a statement in
writing, (a) certifying that this Lease is unmodified and in full force and
effect (or, if modified, stating the nature of such modification and certifying
that this Lease as so modified, is in full force and effect), and the date to
which the rental and other charges are paid in advance, if any, and (b)
acknowledging that there are not, to Tenant's or Landlord's knowledge, as
appropriate, any uncured defaults on the part of the other party hereunder, or
specifying such defaults if any are claimed.  Any such statement may be relied
upon by any prospective purchaser or encumbrancer of all or any portion of the
real property of which the Premises are a part.

  27. PARKING.  Tenant shall have the right to use in common with other tenants
or occupants of the Building the parking facilities of the Building, subject to
the non-discriminatory rules and regulations which may be established or altered
by Landlord at any time or from time to time during the term hereof.  Tenant
shall have the right to the use of fourteen (14) parking spaces.

  28. AUTHORITY OF PARTIES.

      a.  Corporate Authority.  If Tenant is a corporation, each individual
executing this Lease on behalf of said corporation represents and warrants that
he is duly authorized to execute and deliver this Lease on behalf of the
corporation, in accordance with a duly adopted resolution of the board of
directors of said corporation or in accordance with the bylaws of said
corporation, and that this Lease is binding upon said corporation in accordance
with its terms.

                                      11
<PAGE>

      b.  Limited Partnerships. If the Landlord herein is a limited partnership,
it is understood and agreed that any claims by Tenant on Landlord shall be
limited to the assets of the limited partnership, and furthermore, Tenant
expressly waives any and all rights to proceed against the individual partners
or the officers, directors or shareholders of any corporate partner, except to
the extent of their interest in said limited partnership.

  29. GENERAL PROVISIONS.

      a.  Plats and Riders. Clauses, plats, exhibits and riders, if any, signed
by the Landlord and the Tenant and endorsed on or affixed to this Lease are a
part hereof.

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

      c.  Notices.  All notices and demands which may or are to be required or
permitted to be given by either party to the other hereunder shall be in
writing. All notices and demands by the Landlord to the Tenant shall be sent by
a) United States Mail, postage prepaid, or b) nationally recognized overnight
bonded courier, addressed to the Tenant at 5777 Central Avenue, Boulder, CO
80301, or to such other place as Tenant may, from time to time, designate in a
notice to the Landlord. All notices and demands by the Tenant to the Landlord
shall be sent by a) United States Mail, postage prepaid, addressed to the
Landlord at the Office of the Building, or to such other person or place as the
Landlord may, from time to time, designate in a notice to the Tenant.

      d.  Joint Obligation.  If there be more than one Tenant the obligations
hereunder imposed upon Tenants shall be joint and several.

      e.  Marginal Headings.  The marginal headings and Article titles to the
Articles of this Lease are not a part of this Lease and shall have no effect
upon the construction or interpretation of any part hereof.

      f.  Time.  Time is of the essence of this Lease and each and all of its
provisions in which performance is a factor.

      g.  Successors and Assigns. The covenants and conditions herein contained,
subject to the provisions as to assignment, apply to and bind the heirs,
successors, executors, administrators and assigns of the parties hereto.

      h.  Recordation. Neither the Landlord nor Tenant shall record this Lease
or a short form memorandum hereof without the prior written consent of the other
party.

      i.  Quiet Possession.  Upon Tenant paying the rent reserved hereunder and
observing and performing all of the covenants, conditions and provisions of
Tenant's part to be observed and performed hereunder, Tenant shall have quiet
possession of the Premises for the entire term hereof, subject to all the
provisions of this Lease.

      j.  Late Charges. Tenant hereby acknowledges that late payment by Tenant
to Landlord of rent or other sums due hereunder will cause Landlord to incur
costs not contemplated by this Lease, the exact amount of which will be
extremely difficult to ascertain. Such costs include, but are not limited to,
processing and accounting charges, and late charges which may be imposed upon
Landlord by terms of any mortgage or trust deed covering the Premises.
Accordingly, if any installment of rent or of a sum due from Tenant shall not be
received by Landlord or Landlord's designee within five (5) business days after
said amount is due, then Tenant shall pay to Landlord a late charge equal to
five percent (5%) of such overdue amount. The parties hereby agree that such

                                      12
<PAGE>

late charges represent a fair and reasonable estimate of the cost that Landlord
will incur by reason of the late payment by Tenant. Acceptance of such late
charges by the Landlord shall in no event constitute a waiver of Tenant's
default with respect to such overdue amount, nor prevent Landlord from
exercising any of the other rights and remedies granted hereunder.

      k.  Prior Agreements.  This Lease contains all of the agreements of the
parties hereto with respect to any matter covered or mentioned in this Lease,
and no prior agreements or understanding pertaining to any such matters shall be
effective for any purpose.  No provision of this Lease may be amended or added
to except by an agreement in writing signed by the parties hereto or their
respective successors in interest.  This Lease shall not be effective or binding
on any party until fully executed by both parties hereto.

      l.  Attorneys' Fees.  In the event of any action or proceeding brought by
either party against the other under this Lease, the prevailing party shall be
entitled to recover all costs and expenses, including the fees of its attorneys
in such action or proceeding in such amount as the court may adjudge reasonable
as attorneys' fees.

      m.  Sale of Premises by Landlord. In the event of any sale of the
Building, Landlord shall be and is hereby entirely freed and relieved of all
liability under any and all of its covenants and obligations contained in or
derived from this Lease arising out of any act, occurrence or omission occurring
after the consummation of such sale; and the purchaser, at such sale or any
subsequent sale of the Premises, shall be deemed, without any further agreement
between the parties or their successors in interest or between the parties and
any such purchaser, to have assumed and agreed to carry out any and all of the
covenants and obligations of the Landlord under this Lease.

      n.  Subordination, Non-Disturbance and Attornment.  Upon request of the
Landlord, Tenant will, in writing, subordinate its rights hereunder to the lien
of any first mortgage or first deed of trust to any bank, insurance company or
other lending institution, now or hereafter in force against the land and
Building of which the Premises are a part, and upon any buildings hereafter
placed upon the land of which the Premises are a part, and to all advances made
or hereafter to be made upon the security thereof.

      In the event any proceedings are brought for foreclosure, or in the event
of the exercise of the power of sale under any mortgage or deed of trust made by
the Landlord covering the Premises, the Tenant shall attorn to the purchaser
upon any such foreclosure or sale and recognize such purchaser as the Landlord
under this Lease.

      Notwithstanding anything to the contrary contained herein, Tenant shall
only be obligated under this Section 29(n) if such bank, insurance company or
other lending institution or purchaser upon any such foreclosure or sale (a)
recognizes Tenant's interest under this Lease, (b) agrees that, so long as
Tenant is not in default under this Lease beyond any applicable cure periods,
not to disturb Tenant's possession of the Premises, and (c) executes and
delivers a subordination, non-disturbance and attornment agreement substantially
in the form attached hereto as Exhibit D.

      o.  Name.  Tenant shall not use the name of the Building or of the
development in which the Building is situated for any purpose other than as an
address of the business to be conducted by the Tenant in the Premises.

      p.  Separability.  Any provision of this Lease which shall prove to be
invalid, void or illegal shall in no way affect, impair or invalidate any other
provision hereof and such other provision shall remain in full force and effect.

      q.  Cumulative Remedies.  No remedy or election hereunder shall be deemed
exclusive but shall, wherever possible, be cumulative with all other remedies at
law or in equity.

      r.  Choice of Law.  This Lease shall be governed by the laws of the State
in which the Premises are located.

                                      13
<PAGE>

      s.  Signs and Auctions. Tenant shall not place any sign upon the Premises
or Building or conduct any auction thereon without Landlord's prior written
consent which shall not be unreasonably withheld, conditioned or delayed.

      t.  Landlord's Liability.  The liabilities of the partners of the Landlord
pursuant to this Lease shall be limited to the assets of the partnership, and
Tenant, its successors and assigns hereby waive all right to proceed against any
of the partners, or the officers, shareholders, or directors of any corporate
partner of Landlord.  The term "Landlord," as used in this article, shall mean
only the owner or owners at the time in question of the fee title or an interest
in a ground lease of the building.  Notwithstanding anything to the contrary
contained herein, the extent of the Landlord's liability under this Lease shall
be limited to the property of which the Premises herein are a part, and Tenant
shall not seek any personal liability against Landlord or any of Landlord's
partners.

      u.  Waiver of Jury Trial.  Landlord and Tenant waive trial by jury in any
action, proceeding or counterclaim brought by either of the parties to this
Lease against the other on any matters whatsoever arising out of or in any way
connected with this Lease,  the relationship of Landlord and Tenant, Tenant's
use of occupancy of the Premises, or any other claims (except claims for
personal injury or property damage), and any emergency statutory or any other
statutory remedy.

      v.  Arbitration.  With the exception of an action to gain possession of
the Premises, in the event of any other dispute arising out of this Agreement,
the parties agree to submit that dispute to binding arbitration in Boulder,
Colorado, according to the then existing rules for commercial arbitration of the
American Arbitration Association. Either of the parties shall agree to submit
the dispute to the Judicial Arbiter Group, or if they do not so agree, then each
party shall appoint one (1) arbitrator. Those two (2) arbitrators shall select a
third (3rd) arbitrator. The dispute shall be heard within forty-five (45) days
of selection of the third arbitrator. The prevailing party shall be entitled to
recover costs and reasonable attorneys' fees in addition to any other relief to
which they may be entitled. A decision shall be rendered no later than ten (10)
days after the close of the arbitration hearing.

      w.  Financial Statements.  Tenant shall provide their most recent annual
report, including statements of income and expense and statements of net worth
("financial statements") within 15 business days following the written request
of Landlord.  Landlord my request said annual report once during any twelve (12)
month period.  Said annual report shall be verified as being true and correct
and Landlord agrees to keep said annual report confidential, but may use the
annual report for purposes of obtaining financing upon the property.  At the
time Landlord requests annual financial statements from Tenant for financing
purposes, Landlord shall advise Tenant to whom the annual report will be
submitted and Landlord shall, if requested to do so by Tenant, obtain from such
individual or entity a written agreement which shall provide that said annual
report will be and shall remain confidential.  Within fifteen (15) days after
the execution of this Lease, Tenant shall submit to Landlord its most recent
financial statements.

  30. BROKERS.  Tenant warrants that it has had no dealings with any real
estate brokers or agents in connection with the negotiation of this Lease
excepting only The Prudential Wise-McIntire Realtors and The Colorado Group,
Inc. and it knows of no other real estate broker or agent who is entitled to a
commission in connection with this Lease.

  31. HAZARDOUS MATERIALS AND ENVIRONMENTAL CONSIDERATIONS

      a.  Tenant covenants and agrees that Tenant and its agents, employees,
contractors and invitees shall comply with all Hazardous Materials Laws (as
hereinafter defined).  Without limiting the foregoing, Tenant covenants and
agrees that it will not use, generate, store or dispose of, nor permit the use,
generation, storage or disposal of Hazardous Materials (as hereinafter defined)
on, under or about the Leased Premises, nor will it transport or permit the
transportation of Hazardous Materials to or from the Leased Premises, except in
full compliance with any applicable Hazardous Materials Laws.  Any Hazardous
Materials located on the Leased Premises shall be handled in an appropriately
controlled environment which shall include the use of such equipment

                                      14
<PAGE>

(at Tenant's expense) as is necessary to meet or exceed standards imposed by any
Hazardous Materials Laws and in such a way as not to interfere with any other
tenant's use of its premises. Upon breach of any covenant contained herein,
Tenant shall, at Tenant's sole expense, cure such breach by taking all action
prescribed by any applicable Hazardous Materials Laws or by any governmental
authority with jurisdiction over such matters.

      b.  Tenant shall inform Landlord at any time of (i) any Hazardous
Materials it intend to use, generate, handle, store or dispose of, on or about
or transport from, the Leased Premises and (ii) of Tenant's discovery of any
event or condition which constitutes a violation of any applicable Hazardous
Materials Laws. Tenant shall provide to Landlord copies of all communications to
or from any governmental authority or any other party relating to Hazardous
Materials affecting the Leased Premises.

      c.  Tenant shall indemnify and hold Landlord harmless from any and all
claims, judgements, damages, penalties, fines, costs, liabilities, expenses or
losses (including without limitation, diminution on value of the Leased
Premises, damages for loss or restriction on use of all or part of the Leased
Premises, sums paid in settlement of claims, investigation of site conditions,
or any cleanup, removal or restoration work required by any federal, state or
local governmental agency, attorney's fees, consultant fees and expert fees)
which arise as a result of or in connection with any breach of the foregoing
covenants or any other violation contained herein shall also accrue to the
benefit of the employees, agents, officers, directors and/or partners of
Landlord.

      d.  Upon termination of the Lease and/or vacation of the Leased Premises,
Tenant shall properly remove all Hazardous Materials and shall provide to
Landlord an environmental audit report, prepared by a professional consultant
satisfactory to Landlord and at Tenant's sole expense, certifying that the
Leased Premises have not been subjected to environmental harm caused by Tenant's
use and occupancy of the Leased Premises; provided, however, Landlord reasonably
believes that such a report is necessary.  Landlord shall grant to Tenant and
its agents or contractors such access to the Leased Premises as is necessary to
accomplish such removal and prepare such report.

      e.  "Hazardous Materials" shall mean (a) any chemical, material, substance
or pollutant which poses a hazard to the Leased Premises or to persons on or
about the Leased Premises or would cause a violation of or is regulated by any
Hazardous Materials Laws, and (b) any chemical, material or substance defined as
or included in the definitions of "hazardous substances", "hazardous wastes",
"hazardous materials", "extremely hazardous waste", "restricted hazardous
waste", "toxic substances", "regulated substances", or words of similar import
under any applicable federal, state or local law or under the regulations
adopted or publications promulgated pursuant thereto, including, but not limited
to, the Comprehensive Environmental Response. Compensation and Liability Act of
1980, as amended, 42 U.S.C. Sec. 9601, et seq.; the Hazardous Materials
Transportation Act, as amended, 49 U.S.C. Sec. 1801, et seq.; the Resource
Conservation and Recover Act, as amended, 42 U.S.C. Sec. 6901, et seq.; the
Solid Waste Disposal Act, 42 U.S.C. Sec. 6991 et seq.; the Federal Water
Pollution Control Act, as amended, 33 U.S.C. Sec. 1251, et seq., of the Colorado
Revised Statutes. "Hazardous Materials Laws" shall mean any federal, state or
local laws, ordinances, rules, regulations, or policies (including, but not
limited to, those laws specified above) relating to the environment, health and
safety or the use, handling, transportation, production, disposal, discharge or
storage of Hazardous Materials, or to industrial hygiene or the environmental
conditions on, under or about the Leased Premises. Said term shall be deemed to
include all such laws as are now in effect or as hereafter amended and all other
such laws as may hereafter be enacted or adopted during the term of this Lease.

      f.  All obligations of Tenant hereunder shall survive and continue after
the expiration of this Lease or its earlier termination for any reason.

     g.  Tenant further covenants and agrees that it shall not install any
storage tank (whether above or below the ground) on the Leased Premises without
obtaining the prior written consent of the Landlord, which consent may be
conditioned upon further requirements imposed by

                                      15
<PAGE>

Landlord with respect to, among other things, compliance by Tenant with any
applicable laws, rules, regulations or ordinances and safety measures or
financial responsibility requirements.

  32. MISCELLANEOUS

      a.  Heating and air conditioning will be available to the Premises during
normal business hours.  If Tenant wishes to have air conditioning and heat to
the Premises between the hours of 6 p.m. and 6:30 a.m., Monday through Friday,
and the 48 hours of Saturday and Sunday, Tenant agrees to pay for the cost of
operating the system as estimated by Control Service Center.  The cost currently
is estimated to be not more than $10.00 per hour.  There is a dial for after
hour usage located within the Tenant's suite.

      b.  At Tenant's option, Landlord shall provide janitorial services to the
Premises at Tenant's cost and shall bill Tenant therefor monthly.

      c.  Landlord shall, at Landlord's expense construct certain build-out
improvements to the Premises, including construction of suspended ceilings and
outside and partitioning walls; installation of carpeting; painting;
installation of fire sprinkling system; HVAC, and lighting systems; and other
improvements as agreed upon in accordance with plans and specifications
("Plans") to be approved by Landlord and Tenant, and attached hereto as Exhibit
C (hereinafter collectively referred to as the "Tenant Improvement").  Landlord
and Tenant will use their best effort to prepare and approve construction
drawings and specifications, in writing, within twenty-one (21) days after the
date of this Lease.

          Basic rental as set forth in Paragraph 5(a) is based upon Landlord
completing the Tenant Improvements in accordance with the Plans. Landlord's
allowance for Tenant Improvements is $85,900.00. To the extent that the cost of
said improvements is less than or exceeds $85,900.00, basic monthly rental shall
increase or decrease by amortizing the increase or decrease over three (3) years
at 11% per annum. In other words, if Tenant Improvement costs increase or
decrease by $1,000, the basic monthly rental will increase or decrease by
$32.74.

      d.  Tenant has the right, within 10 days prior to possession, to inspect
the Premises after Landlord completes the Tenant Improvements. Tenant has the
right to create a "punch list" of unfinished items based on Tenant's pre-
possession inspection and to add to the "punch list" for a period of 30 days
after taking possession. Landlord is obligated to complete items on the "punch
list" within 30 days.

      e.  Upon full and complete performance of all the terms, covenants and
conditions herein contained by Tenant and payment of all rental due under the
terms hereof, Tenant shall be given the option to renew this Lease for one
additional term of two (2) years.  In the event Tenant desires to exercise said
option, Tenant shall give written notice of such fact to Landlord not less than
one hundred eighty (180) days prior to the expiration of the then current term
of this Lease.  In the event of such exercise, this Lease shall be deemed to be
extended for the additional period on the same terms and conditions; provided,
however, Landlord shall have the option of increasing basic monthly rental under
the provisions of Paragraph 5(a) hereof to the then existing market rate for
similar space in the Boulder vicinity.

      f.  Notwithstanding the provisions of Paragraph 5(a) hereof, Tenant will
receive free basic rental of $40,000.00 from the Commencement Date until the
$40,000.00 has been fully used, and Landlord agrees to accept two hundred fifty
thousand (250,000) shares of the common stock of Tenant, in lieu of an
additional $25,000.00 of basic rent.  Tenant will pay Operating

                                      16
<PAGE>

Expenses from and after the Commencement Date of this Lease. Said stock shall be
issued to Byron R. Chrisman on behalf of BMC Properties, LLC.

LANDLORD:                                TENANT:

BMC PROPERTIES, LLC                      INTELLISTAT MEDIA RESEARCH, INC.

By: /s/Byron R. Chrisman                 By: /s/James M. Le Jeal
   ---------------------                    ----------------------
 Byron R. Chrisman                        James M. Le Jeal
 Manager                                  Chief Financial Officer
 1900 Fifteenth Street                    5777 Central Avenue
 Boulder, CO  80302                       Boulder, CO 80301
 Tax I.D. 84-1322498

                                      17
<PAGE>

                                   ADDENDUM

     THIS ADDENDUM, made and entered into this _____ day of  September, 1997, to
that Lease dated March 3, 1997, by and between BMC Properties, LLC (herein
called "Landlord") and VSTREAM, INCORPORATED, f/k/a Intellistat Media Research,
Inc., (herein called "Tenant").

     The parties hereto agree to modify said Lease as follows:

     1.  It is understood and agreed by Landlord and Tenant that the cost of
Tenant Improvements to be paid by Tenant was $76,780.00.  Under the provisions
of Paragraph 32.c of this Lease, Basic Monthly Rental under the provisions of
paragraph 5.a is to be increased by $32.74 for each $1,000.00 of Tenant
Improvements to be paid by Tenant.  Basic Monthly Rental under the provisions of
paragraph 5.a is hereby increased from $4,295.00 to $6,808.77 ($4,295.00 plus
76.780 x $32.74).

     2.  Tenant hereby acknowledges delivery of  possession of the Premises on
May 16, 1997.

     3.  Other than as modified herein, all terms and conditions of the Lease
shall remain unchanged.

     IN WITNESS WHEREOF, the undersigned have executed this document as of the
date above written.

LANDLORD:                            TENANT:

BMC PROPERTIES, LLC                  VSTREAM, INCORPORATED

By:___________________________       By:_________________________
   Byron R. Chrisman, Manager           James M. LeJeal, Chief Financial Officer
   1900 Fifteenth Street                President
   Boulder, CO 80302                    5777 Central Avenue, Suite 120
                                        Boulder, CO 80301

                                       18

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