The Apartment and Office Building Association of Metropolitan Washington has elected Stephen A. Goldberg of Portal Enterprises its president for this year. The AOBA board also elected Robert T. Foley of Robert T. Foley Co., vice president for commercial properties, B. L. Christenson of Daro Realty Inc. vice president for the District, Morton I. Funger of Community Realty vice president for Maryland, Myron Erkiletian of Erkiletian Construction Co. acting vice president for Virginia, and Joseph E. Seubert of J.B.G. Properties treasurer . . . The Federal National Mortgage Association has appointed Linda Parke Gallagher senior vice president for corporate affairs. In that post she will oversee Fannie Mae's public and government relations and its publications and advertising . . . Arnold S. Tesh has joined Jackson-Cross Appraisal Co. as a vice president specializing in the marketing of real estate counseling and appraisal services. He was formerly director of the United States Railway Association . . . Michael K. Stamper has been named vice president of corporate planning and development at the Federal Home Loan Mortgage Corp. . . . Lee Sammis Associates Inc. has appointed David M. Chalmers its design and construction vice president and Joseph L. Ritchie its vice president of marketing . . . Russell T. Baker & Co. of Baltimore has announced that Charlotte Lindemann, an associate broker, set a record for the central Maryland real estate market by selling more than $6 million in residential properties in 1982 . . . Richard S. Hantgan has joined DRG Ventures Inc. as project manager for acquisitions and development . . . Federal Realty Investment Trust has appointed Meredith A. Olson acquisitions officer for the trust. She was formerly a partner and vice president of Montrose Corp. Fidelity, based in Chevy Chase, owns 19 shopping centers and four apartment developments, most of them in the Washington suburbs . . . Mararin and Odle Realtors Inc. has named Gregory L. Holland chief executive officer of its property management subsidiary . . . James R. Dillon has been named vice president of Spaulding & Slye Construction . . . Richard F. Siegel has joined the downtown office of the commercial sales department of Barnes, Morris & Pardoe Inc. . . . Elmer G. Fannin is now with the Ryland Group Inc. as vice president and plant manager of Ryland Modular Homes' new factory in North East, Md.