Richard C. D. Fleming, now general deputy assistant secretary in the Department of Housing and Urban Development here, has been named president and chief executive officer of Downtown Denver Inc., a nonprofit group created to revitalize that city's downtown core and to increase housing opportunities throughout the city.

The law firm of Wickwire, Peterson and Gavin has signed a contract to relocate its offices in the new Tysons Business Center being built at 8230 Boone Blvd. Long & Foster Realtors arranged the lease for the building being developed by the Palumbo-Veatch partnership.

C. J. (Bud) O'Shaughnessy, formerly vice president of Roger H. Spencer & Co. Inc., has opened his own real estate brokerage office at 260 E. Jefferson St., Rockville.

Lawrence F. Simmons has been named a property manager with Willowick Management Co. in this area. He had been with Poretsky Management Inc. and Landow & Co.

Industrial and office park development in the 1980s will be the topic of Coldwell Banker executive Brian D. Hogg, who will speak Sept. 19 at a luncheon meeting of the Northern Virginia chapter of the National Association of Industrial and Office Parks. The luncheon will be held at the Springfield Hilton. Hogg is president of the NAIOP.

Boston Properties announced that Raymond A. Ritchey has joined the firm as vice president with responsibility for marketing and devlopment in the Washington area. Ritchey, who had been with Coldwell Banker here as a specialist in commercial leasing, is a graduate of the Naval Academy.