EXHIBIT 10.51 INTELLECTUAL PROPERTY SECURITY AGREEMENT This Intellectual Property Security Agreement is entered into as of April 9, 1999 by and between Silicon Valley Bank ("Bank") and Comps.com, Inc. ("Grantor"). Recitals A. Bank has agreed to make certain advances of money and to extend certain financial accommodation to Grantor (the "Loans") in the amounts and manner set forth in that certain Loan and Security Agreement by and between Bank and Grantor dated of even date herewith (as the same may be amended, modified or supplemented from time to time, the "Loan Agreement"; capitalized terms used herein are used as defined in the Loan Agreement). Bank is willing to make the Loans to Grantor, but only upon the condition, among others, that Grantor shall grant to Bank a security interest in certain Copyrights, Trademarks, Patents, and Mask Works to secure the obligations of Grantor under the Loan Agreement. B. Pursuant to the terms of the Loan Agreement, Grantor has granted to Bank a security interest in all of Grantor's right, title and interest, whether presently existing or hereafter acquired, in, to and under all of the Collateral. Now, Therefore, for good and valuable consideration, receipt of which is hereby acknowledged, and intending to be legally bound, as collateral security for the prompt and complete payment when due of its obligations under the Loan Agreement, Grantor hereby represents, warrants, covenants and agrees as follows: Agreement To secure its obligations under the Loan Agreement, Grantor grants and pledges to Bank a security interest in all of Grantor's right, title and interest in, to and under its Intellectual Property Collateral (including without limitation those Copyrights, Patents, Trademarks and Mask Works listed on Schedules A, B, C, and D hereto), and including without limitation all proceeds thereof (such as, by way of example but not by way of limitation, license royalties and proceeds of infringement suits), the right to sue for past, present and future infringements, all rights corresponding thereto throughout the world and all re-issues, divisions continuations, renewals, extensions and continuations-in-part thereof. This security interest is granted in conjunction with the security interest granted to Bank under the Loan Agreement. The rights and remedies of Bank with respect to the security interest granted hereby are in addition to those set forth in the Loan Agreement and the other Loan Documents, and those which are now or hereafter available to Bank as a matter of law or equity. Each right, power and remedy of Bank provided for herein or in the Loan Agreement or any of the Loan Documents, or now or hereafter existing at law or in equity shall be cumulative and concurrent and shall be in addition to every right, power or remedy provided for herein and the exercise by Bank of any one or more of the rights, powers or remedies provided for in this Intellectual Property Security Agreement, the Loan Agreement or any of the other Loan 1 Documents, or now or hereafter existing at law or in equity, shall not preclude the simultaneous or later exercise by any person, including Bank, of any or all other rights, powers or remedies. 2 In Witness Whereof, the parties have cause this Intellectual Property Security Agreement to be duly executed by its officers thereunto duly authorized as of the first date written above. Address of Grantor: Grantor: 9888 Carroll Centre Drive, Suite 100 Comps.com, Inc., San Diego, CA 92126 a Delaware corporation By: /s/ Christopher A. Crane -------------------------- Name: Christopher A. Crane -------------------------- Title: President and CEO ------------------------- Address of Bank: Bank: 3003 Tasman Drive Silicon Valley Bank Santa Clara, CA 95054-1191 Attn: Mezzanine Finance, NC475 By: /s/ Laurita J. Hernandez -------------------------- Name: Laurita J. Hernandez -------------------------- Title: Vice President ------------------------- EXHIBIT A COPYRIGHTS No. Title Physical Name of Date of Date of Eff. Date of Limitation Description Claimant Creation Publication Registration Claim - ------------------------------------------------------------------------------------------------------------------------------------ 4-182-197 Vacant Land Sales, Will 410 p. Comps 1995 10/15/95 12/26/95 Co.,IL, 1/95-9/95 Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-814 Commercial & Industrial 280 p. Comps 1995 10/15/95 12/26/95 building sales, the City Infosystems, Inc. of Chicago, 1/95-9/95 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-815 Commercial & Industrial 1 v. Comps 1995 10/15/95 12/26/95 building sales, the City Infosystems, Inc. of Chicago, year end 1994 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-816 Vacant land sales, the 240 p. Comps 1995 1/15/95 12/26/95 City of Chicago, year end Infosystems, Inc. 1994 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-817 Vacant land sales, the 303 p. Comps 1995 1/15/95 12/26/95 City of Chicago, 1/95-9/95 Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-818 Vacant land sales- 133 p. Comps 1995 10/15/95 12/26/95 sketches, Will Co., IL, Infosystems, Inc. year end 1994 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-819 Commercial & industrial 62 p. Comps 1995 10/15/95 12/26/95 building sales, Will Co., Infosystems, Inc. IL, 1/95-9/95 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-820 Commercial & industrial 193 p. Comps 1995 10/15/95 12/26/95 building sales, No. Cook Infosystems, Inc. Co., IL, 1/95-9/95 - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-821 Vacant land sales, No. 118 p. Comps 1995 1/15/95 12/26/95 Co., IL, 1/95-9/95 Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-822 Vacant land sales, So. 257 p. Comps 1995 1/15/95 12/26/95 Co., IL, 1/95-9/95 Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 4-201-823 Vacant land sales, So. 239 p. Comps 1995 1/15/95 12/26/95 Cook Co., IL, year end Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 4-471-526 COMPSBase (group Comps 1996 12/31/96 1/21/97 registration for Infosystems, Inc. automated database, updates from 1/1/96-9/30/96 - ------------------------------------------------------------------------------------------------------------------------------------ 4-709-358 COMPSBase (group Comps 1996 12/31/96 10/2/97 registration for Infosystems, Inc. automated database, updates from 10/1/96-12/31/96 - ------------------------------------------------------------------------------------------------------------------------------------ 4-709-359 COMPSBase (group Comps 1997 12/31/97 10/2/97 registration for automated Infosystems, Inc. database, updates from 1/1/97-3/31/97 - ------------------------------------------------------------------------------------------------------------------------------------ 4-709-360 COMPSBase (group Comps 1997 9/30/97 1/20/98 registration for automated Infosystems, Inc. database, updates from 7/1/97-9/30/97 - ------------------------------------------------------------------------------------------------------------------------------------ 4-715-252 COMPSBase (group 2 computer Comps 1997 12/31/97 2/2/98 registration for disk Infosystems, Inc. automated database, updates from 10/1/97- 12/31/97 - ------------------------------------------------------------------------------------------------------------------------------------ 4-715-524 COMPSBase (group Comps 1997 6/30/97 10/2/97 registration for automated Infosystems, Inc. database, updates from 4/1/97-6/30/97 - ------------------------------------------------------------------------------------------------------------------------------------ A - 1 - ------------------------------------------------------------------------------------------------------------------------------------ u-682-577 Win Comps 2.0 computer Comps 1995 3/25/96 program Infosystems, Inc. - ------------------------------------------------------------------------------------------------------------------------------------ 103104 Commercial & industrial Land Sales 1994 10/15/95 building sales, So. Cook Resources, Inc. Co., IL, year end 1992 (Comps Infosystems, Inc.) - ------------------------------------------------------------------------------------------------------------------------------------ 115989 Vacant land sales data, Comps Infosystems, 1995 1/15/95 Will Co., IL, year end 1994 Inc. - ------------------------------------------------------------------------------------------------------------------------------------ EXHIBIT B PATENTS - -------------------------------------------------------------------------------- NONE - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- B - 1 EXHIBIT C TRADEMARKS Mark Title Application Number Filing Date Owner of Record Assignment History - ------------------------------------------------------------------------------------------------------------------------ COMPS 75-451,196 March 16, 1998 COMPS INFOSYSTEMS, INC. - ------------------------------------------------------------------------------------------------------------------------ COMPS 75-440,873 February 26, 1998 COMPS INFOSYSTEMS, INC. - ------------------------------------------------------------------------------------------------------------------------ E COMPS 75-342,595 August 18, 1997 COMPS INFOSYSTEMS, INC. - ------------------------------------------------------------------------------------------------------------------------ COMPS NET 2,192,183 September 29, 1998 COMPS INFOSYSTEMS, INC. - ------------------------------------------------------------------------------------------------------------------------ WINCOMPS 2,047,151 March 25, 1997 COMPS Assigned to Venture INFOSYSTEMS, INC. Lending & Leasing - ------------------------------------------------------------------------------------------------------------------------ CALLCOMPS 1,957,864 February 20, 1996 COMPS Assigned to Venture INFOSYSTEMS, INC. Lending & Leasing - ------------------------------------------------------------------------------------------------------------------------ COMPSLINK 1,662,350 October 29, 1991 COMPS Assigned to Venture INFOSYSTEMS, INC. Lending & Leasing - ------------------------------------------------------------------------------------------------------------------------ COMPS 1,653,036 August 6, 1991 COMPS Assigned to Venture INFOSYSTEMS, INC. Lending & Leasing - ------------------------------------------------------------------------------------------------------------------------ REALBID 2,201,095 November 3, 1998 COMPS INFOSYSTEMS, INC. - ------------------------------------------------------------------------------------------------------------------------ C - 1 EXHIBIT D MASKWORKS - -------------------------------------------------------------------------------- NONE - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- D - 1