1

                                                                    Exhibit 99.2

COSTAR ANNOUNCES EXCHANGE RATIOS FOR COMPS.COM STOCK

     BETHESDA, Md., Feb. 15 /PRNewswire/ -- CoStar Group, Inc. (Nasdaq: CSGP)
     announced last Friday that it had completed the acquisition of COMPS.COM
     under a merger agreement entered into on November 3, 1999, among CoStar,
     COMPS and a wholly-owned subsidiary of CoStar.

     Under the terms of the merger agreement, each share of COMPS common stock
     will be exchanged for either $7.50 in cash or 0.31496 shares of CoStar
     common stock, at the election of the holder and subject to adjustment to
     ensure that 49.9% of the COMPS shares will be exchanged for cash and 50.1%
     of the COMPS shares will be exchanged for CoStar common stock.

     Based on available information, CoStar estimates that COMPS stockholders
     that have elected 100% stock in the merger will receive approximately 54.5%
     CoStar common stock and approximately 45.5% cash for each share of COMPS
     stock. These percentages are subject to finalization by the exchange agent.
     COMPS stockholders that have elected 100% cash will receive all cash, and
     COMPS stockholders that did not make any election will receive all cash.
     CoStar estimates that the exchange agent will issue CoStar common stock and
     cash payments within approximately one week to COMPS stockholders who have
     properly tendered their COMPS common stock, subject to finalization of the
     percentages.

     For more information, please contact Meredith Leyva at (202) 421-6214. This
     news release includes "forward-looking statements," which involve many
     risks and uncertainties that could cause actual results to differ
     materially from these statements. If CoStar is not able to integrate the
     operations of COMPS on a timely and cost effective basis, then the merger
     may be not be successful. This could occur for a number of reasons,
     including errors in planning, delays in implementing the integration and
     unexpected events in the markets in which CoStar operates. Important
     factors that could cause actual results to differ materially include, but
     are not limited to, those listed in CoStar's Registration Statement on form
     S-1, filed March 24, 1999, and CoStar's Registration Statement on Form S-4,
     filed on December 10, 1999.

     SOURCE CoStar Group, Inc.
     CONTACT: Meredith Leyva, 202-421-6214, for CoStar Group, Inc./