Document:

<PAGE>

                                                                 Exhibit 10.15.3

                                AMENDMENT NO. 3

          AMENDMENT NO. 3, dated as of February 25, 2000 (this "Amendment"), to
                                                                ---------
the Credit Agreement, dated as of April 30, 1999 (the "Agreement"), among
                                                       ---------
INTERNET CAPITAL GROUP, INC., a Delaware corporation ("ICG"), INTERNET CAPITAL
                                                       ---
GROUP OPERATIONS, INC., a Delaware corporation ("ICG Operations" and together
                                                 --------------
with ICG, each a "Borrower" and collectively the "Borrowers"), the BANKS (as
                  --------                        ---------
defined therein) and PNC BANK, NATIONAL ASSOCIATION, in its capacity as agent
for the Banks (the "Agent"), as amended by that certain Amendment No. 1, dated
                    -----
as of October 27, 1999 ("Amendment No. 1"), that certain Amendment No. 2, dated
                         ---------------
as of November 22, 1999 ("Amendment No. 2"), and that certain Amended and
                          ---------------
Restated Amendment No. 2, dated as of December 10, 1999 ("Amended and Restated
                                                          --------------------
Amendment No. 2"), each by and among ICG, ICG Operations, the Banks and the
---------------
Agent (the Agreement, as amended by Amendment No. 1, Amendment No. 2 and Amended
and Restated Amendment No. 2, being collectively referred to herein as the

"Credit Agreement").
-----------------

                                   RECITALS

          The Borrowers have advised the Agent and the Banks that they, among
other things, wish to amend certain provisions of the Credit Agreement which
prohibit the Borrowers from making investments in third parties under certain
circumstances and the Borrowers have requested the Agent and the Banks to agree
to amend certain provisions of the Credit Agreement as set forth in this
Amendment.  The Agent and the Banks parties hereto are willing to agree to such
amendments, but only on the terms and subject to the conditions set forth in
this Amendment.

          NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Borrowers and the Agent and the Banks parties hereto hereby
agree as follows:

     1.   Defined Terms.  Unless otherwise defined herein, terms defined in the
          -------------
Credit Agreement are used herein as therein.

     2.   Amendments.
          ----------

          (a) Section 1.1 of the Credit Agreement is hereby amended by adding
the following new definitions thereto in the appropriate alphabetical order:

          "Third Supplemental Closing Date" shall have the meaning ascribed to
           -------------------------------
     such term in Section 3 hereof.

          (b) The definition of the term "Permitted Liens" in Section 1.1 of the
Credit Agreement is hereby amended in its entirety to read as follows:
<PAGE>

                                                                 Amendment No. 3

               "Permitted Liens" shall mean:
                ---------------

                        (i)    Liens for taxes, assessments, or similar charges,
incurred in the ordinary course of business and which are not yet due and
payable or which are being contested in good faith by appropriate proceedings,
provided that adequate reserves with respect thereto are maintained on the
--------
books of such Borrower and its respective Subsidiaries, as the case may be, in
conformity with GAAP;

                        (ii)   Pledges or deposits made in the ordinary course
of business to secure payment of workmen's compensation, or to participate in
any fund in connection with workmen's compensation, unemployment insurance, old-
age pensions or other social security programs;

                        (iii)  Liens of mechanics, materialmen, warehousemen,
carriers, or other like Liens, securing obligations incurred in the ordinary
course of business that are not yet due and payable and Liens of landlords
securing obligations to pay lease payments that are not yet due and payable or
in default except where contested in good faith and by appropriate proceedings;
provided that adequate reserves with respect thereto are maintained on the
--------
books of such Borrower and its respective Subsidiaries, as the case may be, in
conformity with GAAP;

                        (iv)   Good-faith pledges or deposits made in the
ordinary course of business to secure performance of bids, tenders, contracts
(other than for the repayment of borrowed money) or leases, not in excess of the
aggregate amount due thereunder, or to secure statutory obligations, or surety,
appeal, indemnity, performance or other similar bonds required in the ordinary
course of business;

                        (v)    Encumbrances consisting of zoning restrictions,
easements or other restrictions on the use of property, none of which materially
impairs the use of such property or the value thereof, and none of which is
violated in any material respect by existing or proposed structures or land use;

                        (vi)   Liens and security interests in favor of the
Agent for the benefit of the Banks;

                        (vii)  Any Lien existing on the date of this Agreement
and described on Schedule 1.1(P), provided that the principal amount secured
                 ---------------  --------
thereby is not hereafter increased, and no additional assets become subject to
such Lien;

                        (viii) Purchase Money Security Interests, provided that
                                                                  --------
the aggregate amount of loans and deferred payments secured by such Purchase
Money Security Interests shall not exceed $2,000,000 (excluding for the purpose
of this computation any loans or deferred payments secured by Liens described on
Schedule 1.1(P));
---------------

                        (ix)   Claims or Liens upon, and defects of title to,
real or personal property other than the Collateral, including any attachment of
real or personal property or other legal process prior to adjudication of a
dispute on the merits; and
<PAGE>

                                                                 Amendment No. 3

                        (x) Cash or Cash Equivalents securing reimbursement
obligations permitted under Section 7.2.1(vii).

     (c) Section 7.1.15 of the Credit Agreement is hereby amended by deleting
such Section in its entirety and substituting in lieu thereof a new Section
7.1.15 to read as follows:

     "7.1.15    Investments.
                -----------

            The Borrowers may make Investments in other Persons in addition to
Investments existing on the Closing Date and disclosed in Schedules 1.1(A-1),
1.1(A-2) and 1.1(A-3) attached hereto as follows:

            (1) the Borrowers may make any Investment without restriction as to
amount, but otherwise subject to the terms and conditions of this Agreement, if
on the date of the proposed Investment, after giving effect to the proposed
Investment, the sum of (i) the Borrowers' Cash and Cash Equivalents and (ii)
Borrowing Base Availability shall exceed $500,000,000;

            (2) if on the date of the proposed making of the Investment, after
giving effect to the proposed Investment, the sum of (i) the Borrowers' Cash and
Cash Equivalents and (ii) Borrowing Base Availability shall be greater than
$200,000,000 but less than or equal to $500,000,000, the Borrowers may make an
Investment in such Investment Entity of up to 50% of the sum of (i) the
Borrowers' Cash and Cash Equivalents and (ii) Borrowing Base Availability,
determined as of the date of the Investment but before giving effect to the
proposed Investment; and

            (3) if on the date of the proposed making of the Investment, after
giving effect to the proposed Investment, the sum of (i) the Borrowers' Cash and
Cash Equivalents and (ii) Borrowing Base Availability shall be between zero and
$200,000,000, the Borrowers may make an Investment in such Investment Entity of
up to 40% of the sum of (i) the Borrowers' Cash and Cash Equivalents and (ii)
Borrowing Base Availability, determined as of the date of the Investment but
before giving effect to the proposed Investment.

The Borrowers will promptly, and in any event within five (5) Business Days of
the making of any such Investment, provide to the Agent and the Banks an updated
Annex A to the Letter Agreement reflecting any such additional Investment.
Notwithstanding anything to the contrary contained herein, the prohibitions
contained in this Section 7.1.15 shall not apply to the extent Investments are
made with the capital stock of ICG."

            (d) Section 7.2.1 of the Credit Agreement is hereby amended by
deleting the word "and" at the end of subclause (v), adding the word "; and"
prior to the period at the end of subclause (vi), deleting the period at the end
of subclause (vi) and adding a new subclause (vii) to read as follows: "(vii)
Indebtedness in respect of (1) reimbursement obligations with respect to letters
of credit and acceptances and (2) the undrawn portion of the face amount of
letters of credit issued for the account of any Borrower in an aggregate amount
exceeding for the Borrowers' $25,000,000 at any one time outstanding."
<PAGE>

                                                                 Amendment No. 3

     3.  Effectiveness.  The effectiveness of this Amendment, is subject to the
         -------------
satisfaction of the following conditions precedent (the date of such
satisfaction being herein referred to as the "Third Supplemental Closing Date"):
                                              -------------------------------

         (a) Amendment.  The Agent shall have received this Amendment, executed
             ---------
     and delivered by a duly authorized officer of each of the Borrowers, with a
     counterpart for each Bank.

         (b) Borrowing Base Certificate.  On or prior to the Third Supplemental
             --------------------------
     Closing Date, the Agent and the Banks shall have received and the Agent and
     the Banks shall be satisfied (both as to form and substance) with a pro
                                                                         ---
     forma Borrowing Base Certificate in the form set forth in Exhibit 1.1(B) to
     -----
     the Credit Agreement which shall be prepared as of a date prior to the
     Third Supplemental Closing Date.

         (c) Proceedings of the Borrower.  The Agent shall have received, with
             ---------------------------
     a counterpart for each Bank, a copy of the resolutions, in form and
     substance satisfactory to the Agent, of each of the Borrowers authorizing
     the execution, delivery and performance of this Amendment and the other
     Amendment Documents to which it is a party, certified by the Secretary or
     an Assistant Secretary of each of the Borrowers as of the Third
     Supplemental Closing Date, which certificate shall be in form and substance
     satisfactory to the Agent and shall state that the resolutions thereby
     certified have not been amended, modified, revoked or rescinded.

         (d) Borrower Incumbency Certificate.  The Agent shall have received,
             -------------------------------
     with a counterpart for each Bank, a certificate of each of the Borrowers,
     dated the Third Supplemental Closing Date, as to the incumbency and
     signature of the officers of each of the Borrowers executing this Amendment
     or the other Amendment Documents to which each of the Borrowers is a party,
     satisfactory in form and substance to the Agent, executed by an Authorized
     Officer of each of the Borrowers.

         (e) Representations and Warranties.  Each of the representations and
             ------------------------------
     warranties made by each of the Borrowers and the other Loan Parties in or
     pursuant to the Loan Documents shall be true and correct in all material
     respects on and as of the Third Supplemental Closing Date as if made on and
     as of such Third Supplemental Closing Date (and after giving effect to the
     amendments provided for in this Amendment) (or, if any such representation
     or warranty is expressly stated to have been made as of a specific date, as
     of such specific date).

         (f) No Default.  No Potential Default or Event of Default shall have
             ----------
     occurred and be continuing on the Third Supplemental Closing Date or after
     giving effect to the amendments provided for in this Amendment.

         (g) Additional Matters.  All corporate and other proceedings, and all
             ------------------
     documents, instruments and other legal matters in connection with the
     transactions contemplated by this Agreement, the other Loan Documents and
     the 1999 Subordinated Loan Documents shall be satisfactory in form and
     substance to the Agent, and the Agent shall have received such other
     documents and legal opinions in respect of any aspect or
<PAGE>

                                                                  Amendment No.3

     consequence of the transactions contemplated hereby or thereby as it shall
     reasonably request.

     4.  Representations and Warranties.  To induce the Agent and the Banks to
         ------------------------------
enter into this Amendment, the Borrowers hereby represent and warrant to the
Agent and the Banks that, after giving effect to the amendments provided for
herein, the representations and warranties contained in the Credit Agreement and
the other Loan Documents will be true and correct in all material respects as if
made on and as of the date hereof and that no Potential Default or Event of
Default will have occurred and be continuing (or, if any such representation or
warranty is expressly stated to have been made as of a specific date, as of such
specific date).

     5.  No Other Amendments.  Except as expressly amended hereby, the Credit
         -------------------
Agreement, the Notes and the other Loan Documents shall remain in full force and
effect in accordance with their respective terms, without any waiver, amendment
or modification of any provision thereof.

     6.  Counterparts.  This Amendment may be executed by one or more of the
         ------------
parties hereto on any number of separate counterparts and all of said
counterparts taken together shall be deemed to constitute one and the same
instrument.

     7.  Expenses.  The Borrowers agree to pay and reimburse the Agent for all
         --------
of the out-of-pocket costs and expenses incurred by the Agent in connection with
the preparation, execution and delivery of this Amendment, including, without
limitation, the reasonable fees and disbursements of Buchanan Ingersoll
Professional Corporation, counsel to the Agent.

     8.  Applicable Law.  THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND
         --------------
INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE COMMONWEALTH OF PENNSYLVANIA.

                  [remainder of Page Intentionally Left Blank]
<PAGE>

                                                                 Amendment No. 3

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 3 to
be duly executed and delivered as of the day and year first above written.

                              INTERNET CAPITAL GROUP, INC.

                              By:  /s/  John N. Nickolas
                                   -----------------------------------
                                   Name:   John N. Nickolas
                                   Title:  Managing Director, Finance

                              INTERNET CAPITAL GROUP OPERATIONS, INC.

                              By:  /s/  John N. Nickolas
                                   -----------------------------------
                                   Name:   John N. Nickolas
                                   Title:  Managing Director, Finance

                              PNC BANK, NATIONAL ASSOCIATION,
                              individually and as Agent

                              By:  /s/  Wayne D. Lavelle
                                   -----------------------------------
                                   Name:   Wayne D. Lavelle
                                   Title:  Vice President

                              BANK OF AMERICA, N.A., formerly known as
                              BANK OF AMERICA NATIONAL TRUST AND
                              SAVINGS ASSOCIATION

                              By:  /s/  Jouni Korhonen
                                   -----------------------------------
                                   Name:   Jouni Korhonen
                                   Title:  Principal
<PAGE>

                                                                 Amendment No. 3

                              COMERICA BANK-CALIFORNIA

                              By:  /s/  Alan Jepsen
                                   ---------------------------
                                   Name:   Alan Jepsen
                                   Title:  Vice President

                              IMPERIAL BANK

                              By:  /s/  James N. Reddish
                                   ---------------------------
                                   Name:   James N. Reddish
                                   Title:

                              PROGRESS BANK

                              By:  /s/  Liz Lambert
                                   ---------------------------
                                   Name:   Liz Lambert
                                   Title:  Vice President<PAGE>

                                                                   Exhibit 10.30

                              SUBLEASE AGREEMENT

1.   PARTIES

          THIS SUBLEASE, dated January 6, 2000 is made between SP INVESTMENTS
INC., a Washington corporation ("Sublessor") and INTERNET CAPITAL GROUP, INC., a
Delaware corporation ("Sublessee").

2.   MASTER LEASE AND PREMISES

          Sublessor is the tenant under a written Lease Agreement (the "Master
Lease"), dated March 13, 1995, wherein Third and University Limited Partnership,
a Washington limited partnership (hereinafter "Landlord" shall refer to Third
and University Limited Partnership, or its successor in interest) leases to
Sublessor those certain premises (the "Master Premises") consisting of
approximately 18,563 rentable square feet located on the 54th and 55th floors of
the building ("Building") commonly known as Washington Mutual Tower, 1201 Third
Avenue, Seattle, Washington situated on the real property located in the City of
Seattle, County of King, State of Washington, legally described in the Master
Lease.

3.   PREMISES

          For the entire term, as set forth in Section 4 below, Sublessor hereby
subleases to Sublessee and Sublessee subleases from Sublessor, on and subject to
the terms, conditions and reservations set forth in this Sublease, the portion
of the Master Premises consisting of 4,281 rentable square feet as shown on the
Floor Plans for the 54th floor of the Building attached hereto as Exhibit A (the
"Premises").

4.   TERM

          The term of this Sublease shall commence on the later of January 1,
2000 or two weeks after the Premises are delivered to Sublessee ("Commencement
Date"), and end on November 30, 2004 ("Termination Date"), unless otherwise
sooner terminated in accordance with the provisions of this Sublease.
Possession of the Premises ("Possession Date") shall be delivered to Sublessee
on or before January 1, 2000.  In the event the Possession Date shall not have
occurred for any reason on or before January 1, 2000, in addition to Sublessee's
other rights and remedies, Sublessee shall have the right to terminate the
Sublease upon written notice to Sublessor upon which Sublessor shall reimburse
Sublessee all monies paid by Sublessee, except if delay in Possession Date is
caused by current Sublessee wrongfully failing to vacate the Premises,
Sublessee's remedy shall be termination of this Sublease and reimbursement of
monies paid.
<PAGE>

5.   RENT

     5.1. Base Rent. Commencing on the Commencement Date, Sublessee shall pay to
Sublessor as base rent, without deduction, setoff, notice, or demand, at the
address of Sublessor set forth below or at such other place as Sublessor shall
designate from time to time by notice to Sublessee, the sum of $16,053.75 per
month, in advance on the first day of each month of the term of this Sublease
(the "Base Rent"). The first month's rent (for the period commencing on January
15 and ending January 31 in the event the Possession Date occurs on January 1,
2000) payable by Sublessee shall be $8,026.88 and shall be payable upon
execution of this Sublease.

     5.2. Operating Costs and Taxes. In addition to base rent payable by
Sublessee to Sublessor as set forth in Section 5.1 above, commencing on January
1, 2001, Sublessee shall pay Sublessor, as additional rent, 23% of the amount by
which "operating costs" and "taxes," as such terms are defined in the Master
Lease payable by Tenant under the Master Lease exceeds operating costs and/or
taxes payable by Tenant under the Master Lease with respect to calendar year
2000 (the "Base Year"). Such additional rent shall be payable as and when
operating costs and taxes are payable by Tenant to Landlord. If the Master Lease
provides for the payment by Tenant of operating costs and taxes on the basis of
an estimate thereof, then as and when adjustments between estimated and actual
operating costs and taxes are made under the Master Lease, the obligations of
Sublessor and Sublessee hereunder shall be adjusted in a like manner, and if any
such adjustment shall occur after the expiration or earlier termination of this
Sublease, then the obligations of Sublessor and Sublessee under this Subsection
5.2 shall survive such expiration or termination. Sublessor shall promptly
furnish Sublessee with copies of all statements by Landlord of actual or
estimated operating costs and taxes during the term. In the event Sublessor is
required to pay any other additional rents or other sums pursuant to the Master
Lease which benefits the Premises and/or Sublessee's operations during the term
of this Sublease, Sublessee shall pay to Sublessor 23% of such costs incurred as
additional rent hereunder. Notwithstanding anything in this Section 5.2 to the
contrary, in the event special or extra services or utilities are requested by
Sublessee or Sublessor with respect to their use of the Premises, as applicable,
the party requesting such special or extra services or utilities shall be solely
responsible for payment of the same.

     5.3. Rent. The Base Rent payable by Sublessee pursuant to Section 5.1
above, together with additional rent payable by Sublessee pursuant to 5.2 above
and any other sums payable by Sublessee under this Sublease shall be
collectively referred to herein as "Rent."

6.   SECURITY DEPOSIT.

          As security for the performance of this Sublease by Sublessee,
Sublessee shall pay a security deposit equal to the first and last months' Base
Rent $24,080.63 upon full execution of the sublease. To the extent such funds
are not otherwise applied under the terms of this Section 6, Sublessor shall
apply such Security Deposit to Rent due for the first and last months of the
Sublease term. Sublessor may apply all or any part of the Security Deposit to
the payment of any sum in default (beyond applicable notice and cure periods) or
any other sum which Sublessor may be required or may in its reasonable
discretion deem necessary to spend or

                                      -2-
<PAGE>

incur by reason of Sublessee's default (beyond applicable notice and cure
periods). In such event, Sublessee shall, within five days of written demand
therefor by Sublessor, deposit with Sublessor the amount so applied. The amount
of the Security Deposit held by Sublessor at the expiration or sooner
termination of this Sublease and not applied by Sublessor under the provisions
of this Section 6 shall be repaid to Sublessee within 30 days after expiration
or sooner termination of this Sublease. Sublessor shall not be required to keep
any Security Deposit separate from its general funds and Sublessee shall not be
entitled to any interest thereon.

7.   USE OF PREMISES

          The Premises shall be used and occupied only for the uses allowed
under the Master Lease and for no other use or purpose.

8.   ASSIGNMENT AND SUBLETTING

          Sublessee shall not assign, mortgage, encumber or otherwise transfer
this Sublease or sublet the whole or any part of the Premises without in each
case first obtaining Sublessor's prior written consent, and the prior written
consent of the Landlord under the Master Lease, except that assignment to an
affiliate of Sublessee shall not require Sublessor's consent.  Sublessor shall
not unreasonably withhold or delay its consent under this Section 8, except that
Sublessor may withhold in its absolute and sole discretion, its consent to any
mortgage, hypothecation, pledge or other encumbrance of any interest in this
Sublease or the Premises by Sublessee or any subtenant of Sublessee, whereby
this Sublease or any interest therein becomes collateral for any obligation of
Sublessee.  In lieu of granting any such consent, Sublessor reserves the right
to terminate this Sublease, or in the case of subletting or assignment, in which
event Sublessor may elect to enter into the relationship of sublandlord and
subtenant with such proposed assignee or subtenant, based upon the rent and
other compensation and terms and conditions agreed to by such subtenant or
assignee and otherwise upon the terms and conditions of this Sublease.  If there
is a partial termination of the Sublease pursuant to this Section 8, the Rent
payable hereunder shall be reduced based upon the square footage of the area
subject to the partial termination.  In connection with each request for an
assignment or subletting, Sublessee shall pay the reasonable cost of processing
such assignment or subletting, including attorneys fees, upon demand of
Sublessor (not to exceed $1,000 in the aggregate).  Sublessee shall provide
Sublessor with copies of all assignments, subleases and assumption instruments.

9.   RIGHT OF FIRST NEGOTIATION

          If Sublessor desires from time to time, during the terms of this
Sublease, to sublease additional portions of the Master Premises to someone
other than an affiliate or business associate (i.e., someone with whom Sublessor
or one or more of its affiliates has or expects to have a business relationship
other than one of Landlord and Tenant), Sublessor shall offer Sublessee a
continuing first right to negotiate a sublease for all such additional spaces
(each, an "Additional Space").  In such event, Sublessor shall give Sublessee
written notice indicating the portion of the Master Premises that will be
available, the timing of such availability, and proposed rental terms.  In the
event Sublessee desires to sublease such Additional Space,

                                      -3-
<PAGE>

Sublessee and Sublessor shall then negotiate in good faith all terms and
conditions of an amendment to the Sublease to include such Additional Space into
the Premises. If the parties fail, for any reason, to enter into such amendment
within thirty (30) days, then Sublessor shall be free to sublease the subject
space to others upon similar terms and conditions provided, however, such terms
and conditions offered to any third party shall not be more economically
favorable than those offered to Sublessee without first offering such Additional
Space to Sublease on such favorable terms and conditions (in such case Sublessee
shall have five (5) business days of written notice to accept the offer).

10.    OTHER PROVISIONS OF SUBLEASE

          All applicable terms and conditions of the Master Lease are
incorporated into and made a part of this Sublease as if fully set forth herein
except that references to "Landlord" and "Tenant" shall mean "Sublessor" and
"Sublessee" respectively and except that the following provisions of the Master
Lease shall not be incorporated into this Sublease:

          (a)  Subsections 1(b)(c)(d)(e)(f)(g)(h) and (j) are excluded
          (b)  Exhibit C is excluded except for paragraphs 2 (as modified by
               Section 11 below), 3, 4 and 5
          (c)  Section 3 is superseded and replaced with Section 4 above
          (d)  Section 4 is excluded
          (e)  Section 5 is superseded and replaced with Section 5.1 above
          (f)  Section 10 is modified to be consistent with Section 5.2 above
          (g)  Section 27, 29 and 35(c) are excluded
          (h)  References to "Landlord" in Sections 13 and 26 of the Master
               Lease shall mean Landlord under the Master Lease only and not
               Sublessor.

          In addition, the terms and conditions of Section 21 of the Master
Lease are incorporated as if Sublessee were the Tenant and the Sublease were the
Lease; except that a non-disturbance agreement shall not be required with
respect to this sublease.

          Sublessee agrees to perform the Tenant's obligations under the Master
Lease (except such provisions as excluded or replaced as set forth above) during
the term of this Sublease, except that the obligation to pay Rent to Landlord
shall be considered performed by Sublessee to the extent Rent is paid to
Sublessor in accordance with Section 5 of this Sublease.  Sublessee shall not
commit or suffer any act or omission that will violate any of the provisions of
the Master Lease.  Sublessor shall exercise due diligence in attempting to cause
Landlord to perform its obligations under the Master Lease for the benefit of
Sublessee.

          If the Master Lease terminates for any reason, this Sublease shall
terminate and the parties shall be relieved of any further liability or
obligation under this Sublease, provided, however, that if the Master Lease
terminates as a result of a default or breach by Sublessor or Sublessee under
this Sublease and/or the Master Lease, then the defaulting party shall be liable
to the nondefaulting party for the damage suffered as a result of such
termination.  Sublessor shall not voluntarily terminate the Master Lease, except
as permitted in Sections 13 and 26 of the

                                      -4-
<PAGE>

Master Lease. Notwithstanding the foregoing, if the Master Lease gives Sublessor
any right to terminate the Master Lease in the event of the partial or total
damage, destruction, or condemnation of the Master Premises or the Building of
which the Premises are a part, the exercise of such right by Sublessor shall not
constitute a default or breach hereunder. Notwithstanding the preceding
sentence, Sublessor shall not exercise any such right to terminate the Master
Lease in the event of damage, destruction or condemnation if Sublessee agrees in
writing, prior to the date upon which such termination notice must be given, to
assume all obligations of Sublessor under the Master Lease (including the full
rent and other monetary obligations thereunder) from and after the date upon
which Sublessor had the right to terminate the Master Lease.

11.    IMPROVEMENTS TO PREMISES

          (a) Sublessor shall provide to Sublessee a $5.00 per rentable square
foot tenant improvement allowance for the work as shown on Exhibit B (the "Floor
Plan"), which shall be credited toward rent beginning the month following
completion of such improvements. Sublessee shall be responsible for any and all
costs in excess of the $5.00 per rentable square foot allowance provided by
Sublessor.

          (b) Subject to obtaining Landlord's written consent, Sublessor
consents to Sublessee's alteration of the Premises as indicated in the Floor
Plan, including the hard wall changes indicated on the Floor Plan, and changing
the existing wall color and carpet. The existing wood trim finish (including as
to color) shall not be changed, but pieces may be removed and new pieces
installed as needed to reconfigure the Premises as shown in the Floor Plan. Any
new trim pieces shall match the existing trim (including as to color) as close
as reasonably practical. Any and all tenant improvements shall be coordinated
through Landlord and are subject to the provisions of Section 11 of the Master
Lease. Sublessee shall provide additional plans and specifications for the
alterations as required by Landlord and shall not proceed with the alterations
until Landlord's written consent is obtained.

          (c) Subject to the provisions of Section 13 of the Master Lease
relating to damage and destruction, upon expiration or sooner termination of
this Lease, Sublessee shall restore the three exterior offices marked on Exhibit
C (the "Restoration Offices") to substantially the same condition as they were
in when delivered to Sublessee, except that wall paint and carpet shall match
what is then used in the rest of the private offices in the Premises.
Notwithstanding the foregoing, Sublessor may subsequently elect to waive the
requirement that the Restoration Offices be restored. Such election shall only
be effective when and if written notice of such election is given by Sublessor
to Sublessee. Unless Sublessor subsequently waives the restoration requirement,
the provisions in Section 10(c) shall control over those of Section 22 of the
Master Lease with respect to the Restoration Offices.

          (d) Sublessee may deliver to Sublessor items of wood trim, doors,
hardware and other such finish items for the Restoration Offices. Sublessor will
store such items during the term of this Sublease at its costs and return such
items to Sublessee for use in restoring the

                                      -5-
<PAGE>

Restoration Offices as required by Section 10(c). If Sublessor subsequently
waives the restoration requirements in Section 10(c), Sublessor may then dispose
of the items stored under this Section 10(d), as Sublessor deems appropriate.

          (e) If Sublessee's net worth drops below $100,000,000 (as indicated in
any publicly available financial statements) at any time during the term of this
Sublease and unless Sublessee has waived the restoration requirements in Section
10(c) of this Sublease, Sublessee shall immediately increase the Security
Deposit under Section 6 of this Sublease by $20,000. Notwithstanding the
provisions of Section 6, Sublessor shall not be required to apply the increased
deposit amount to the last month or months rent, and the increased amount may be
held by Sublessee until the Premises are returned as provided in Section 22 of
the Master Lease, as modified by Section 10(c) of this Sublease.

12.  PARKING AND SIGNAGE

          Sublessee shall be entitled to lease from Landlord four of the parking
stalls provided under Section 7 of the Master Lease during the term of this
Sublease.  Sublessee shall be entitled to building standard suite and directory
signage.

13.  BROKER PARTICIPATION

          Sublessor and Sublessee warrant and represent that they have dealt
with no real estate broker in connection with this Sublease other than Pacific
Real Estate Partners, Inc. and Washington Partners, Inc. pursuant to separate
agreements, and that no other broker is entitled to any commission on account of
this Sublease.

14.  ATTORNEY'S FEES

          If Sublessor or Sublessee shall commence an action against the other
arising out of or in connection with this Sublease, the prevailing party shall
be entitled to recover its costs of suit and reasonable attorney's fees.

15.  NOTICES

          All notices and demands which may or are to be required or permitted
to be given by either party on the other hereunder shall be in writing.  All
notices and demands by the Sublessor to Sublessee shall be delivered by hand or
sent by overnight courier or by United States Mail, postage prepaid, addressed
to the Sublessee at the Premises, and to the addresses herein below, or to such
other place as Sublessee may from time to time designate in a notice to the
Sublessor.  All notices and demands by the Sublessee to Sublessor shall be sent
by United States Mail, postage prepaid, addressed to the Sublessor at the
address set forth herein, and to such other person or place as the Sublessor may
from time to time designate in a notice to the Sublessee.

                                      -6-
<PAGE>

          To Sublessor:  SP Investments Inc.
                         1201 Third Avenue, Suite 5400
                         Seattle, WA  98101-3031
                         Attn:  Legal Department

          To Sublessee:  Internet Capital Group, Inc.
                         1201 Third Avenue, Suite 5450
                         Seattle, WA  98101-3031

          All notices and demands sent by United States Mail shall be deemed
delivered three business days after mailing, and those sent by overnight courier
shall be deemed delivered one business day after being deposited with an
overnight courier.

16.  SUBLESSOR'S OBLIGATIONS

          Sublessor shall fully perform all of its obligations under the Master
Lease to the extent Sublessee has not expressly agreed to perform such
obligations under the Sublease.  Sublessor, with respect to the obligations of
Landlord under the Master Lease, shall use Sublessor's diligent good faith
efforts to cause Landlord to perform such obligations for the benefit of
Sublessee.  Such diligent good faith efforts shall be satisfied by the
following: (a) upon Sublessee's written request, promptly notifying Master
Landlord of its nonperformance under the Master Lease, and requesting that
Landlord perform its obligations under the Master Lease; and (b) Sublessor shall
not unreasonably withhold consent to Sublessee to commence arbitration pursuant
to Paragraph 5 of Exhibit C of the Master Lease in Sublessor's name to obtain
the performance required from Landlord under the Master Lease; provided,
however, that if Sublessee commences an arbitration action, Sublessee shall pay
all costs and expenses incurred in connection therewith, and Sublessee shall
indemnify Sublessor against, and hold Sublessor harmless from, all reasonable
costs and expenses incurred by Sublessor in connection therewith.

17.  CONSENT BY LANDLORD

          This Sublease shall be of no force or effect unless consented to by
Landlord within 15 days after execution hereof.  Such consent shall state, and
Sublessee hereby agrees, that the waiver of subrogation set forth in Section 14
and shall apply as between Landlord and Sublessee.

                                      -7-
<PAGE>

18.  COUNTERPART SIGNATURES

          This document may be executed by the parties in counterpart and, when
so executed by all parties, all such original counterparts shall together
constitute a single binding document.

SUBLESSOR:                                    SUBLESSEE:

SP INVESTMENTS INC.                           INTERNET CAPITAL GROUP, INC.

By: /s/  John M. Orelek                       By: /s/  Henry N. Nassau
    -----------------------------                 -----------------------------
    Its:   President                              Its:   Managing Director and
                                                         General Counsel
Date: 1/13/00                                 Date:

                                      -8-
<PAGE>

STATE OF PENNSYLVANIA  )
                       )  ss
COUNTY OF CHESTER      )

          I certify that I know or have satisfactory evidence that the person
appearing before me and making this acknowledgment is the person whose true
signature appears on this document.

          On this 6th day of January, 2000, before me personally appeared, Henry
Nassau to me known to be the ______________ of SP Investments Inc., a Washington
corporation, the corporation that executed the within and foregoing instrument,
and acknowledged the said instrument to be the free and voluntary act and deed
of said corporation, for the uses and purposes therein mentioned, and on oath
stated that he was authorized to execute said instrument and that the seal
affixed, if any, is the corporate seal of said corporation.

          WITNESS my hand and official seal hereto affixed the day and year
first above written.

          /s/  Carol J. Robey
          -------------------
          Notary Public in and for the State of Pennsylvania, residing at
          ______________________
          My commission expires:  10/06/03

STATE OF WASHINGTON    )
                       )  ss
COUNTY OF KING         )

          I certify that I know or have satisfactory evidence that the person
appearing before me and making this acknowledgment is the person whose true
signature appears on this document.

          On this 13th day of January, 2000, before me personally appeared, John
M. Orelek, to me known to be the President of SP Investments Inc., a Washington
corporation, the entity that executed the within and foregoing instrument, and
acknowledged the said instrument to be the free and voluntary act and deed of
said corporation, for the uses and purposes therein mentioned, and on oath
stated that he was authorized to execute said instrument and that the seal
affixed, if any, is the corporate seal of said corporation.

          WITNESS my hand and official seal hereto affixed the day and year
first above written.

          /s/  Toni Fimiani
          -----------------------------------
          Notary Public in and for the State of Washington, residing at King Co.
          My commission expires:  11/19/2000

                                      -9-
<PAGE>

                              CONSENT BY LANDLORD

          The undersigned, the Prime Landlord, joins in the execution of this
Sublease solely to evidence its consent to the subletting of the Premises
described herein, as such consent is required pursuant to the Prime Lease.
However, by this consent Prime Landlord does not approve or disapprove this
Sublease, and neither the execution of this Sublease nor anything done pursuant
to the provisions thereof shall be deemed or constructed to modify the Prime
Lease; and it is understood that SP Investments Inc. (Sublessor) remains liable
for its obligations under the Lease.  This consent shall not be deemed to
increase the obligations or liabilities of the Prime Landlord, nor to reduce the
Prime Landlord's rights and remedies under the Prime Lease.  This consent shall
not be deemed a consent to any other or further subletting.  Notwithstanding the
foregoing, Prime Landlord hereby agrees that the waiver of subrogation
provisions set forth in Section 14 of the Prime Lease shall apply as between
Prime Landlord and Sublessee.

LANDLORD: THIRD AND UNIVERSITY LIMITED PARTNERSHIP,
          a Washington limited partnership

          By:  1212 SECOND AVENUE LIMITED PARTNERSHIP,
               a Washington limited partnership,
               Its General Partner

               By:  1201 THIRD AVENUE LIMITED PARTNERSHIP,
                    a Washington limited partnership,
                    Its General Partner

                    By:  WRIGHT RUNSTAD ASSOCIATES LIMITED PARTNERSHIP, a
                         Washington limited partnership,
                         Its General Partner

                         By:  WRIGHT RUNSTAD & COMPANY, a
                              Washington corporation
                              Its General Partner

                              By:  /s/  H. Jon Runstad
                                   --------------------------------------
                                    H. Jon Runstad
                                    Chairman and Chief Executive
                                    Officer

                                      -10-
<PAGE>

                         PRIME LANDLORD ACKNOWLEDGMENT

STATE OF WASHINGTON    )
                       )  ss
COUNTY OF KING         )

          This is to certify that on this 20th day of January, 2000, before me
personally appeared H. Jon Runstad, to me known to be the Chairman and CEO of
WRIGHT RUNSTAD & COMPANY, a corporation to me known to be the general partner of
WRIGHT RUNSTAD ASSOCIATES LIMITED PARTNERSHIP, a limited partnership, to me
known to be the general partner of 1201 THIRD AVENUE LIMITED PARTNERSHIP, a
limited partnership, to me known to be the general partner of 1212 SECOND AVENUE
LIMITED PARTNERSHIP, a limited partnership, to me known to be the general
partner of THIRD AND UNIVERSITY LIMITED PARTNERSHIP, the Washington limited
partnership that executed the within and foregoing instrument, and acknowledged
the said instrument and that the seal affixed, if any, is the corporate seal of
said corporation.

          WITNESS my hand and official seal hereto affixed the day and year
first above written.

          /s/  Nathan Paul Good
          ---------------------------------------
          Notary Public in and for the State of Washington, residing at Seattle
          My commission expires:  11/29/03

                                      -11-

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