PERSONNEL FILE . . .The Association of Local Housing Finance Officers has elected Bernard L. Tetreault president. Tetreault is executive director of the Montgomery County Housing Opportunities Commission and is one of the organizers of ALFHA. The association was formed last year and represents those interested in financing housing through tax-exempt bonds . . . The National Corporation for Housing Partnerships has named George M. Brady Jr. chairman, succeeding George W. DeFranceaux, and has promoted Robert Bennett to president and chief operating officer . . . Allen F. Hainge has been named director of training and recruiting for the Virginia division of Merrill Lynch Realty Inc. . . . and Sigrid Kingsbury of Merrill LynchChris Coile Realtors has been named distinguished associate of the year by the Maryland Association of Realtors . . . Robert W. Snider has assumed the post of president of Snider Bros. Property Management Inc. . . . Jerrold H. Malamut has joined Danac as a retail leasing specialist. IN THE BUSINESS . . . Long Enterprises announces the formation of Signature Communities Inc. to concentrate on residential and light commercial construction in the area. The new firm is to be headed by F. Gary Garczynski, former head of Scarborough Corp. in Northern Virginia . . . Shannon & Luchs reports record May sales in both its Virginia and Maryland/D.C. divisions. The firm sold 348 homes in Virginia and 658 in Maryland and the District. Both figures represent an increase of more than 100 percent over a year ago . . . Fairfax Adult Education is sponsoring a 10-hour course, starting June 30, on using the new tax law to make money in real estate. For information, call 698-0400, ext. 38 . . . Stuart A. Bernstein & Co. has retained Roger Houle and Whitney Stewart as consultants for the planned conversion to condo of Boston House, a 270-unit building at 1711 Massachusetts Ave. NW . . . Slye & Associates is opening a new offices at 9902 Counselman Rd. in Potomac. ON THE MOVE . . . The National Geographic Society has leased 10,000 square feet at 1730 M St. NW, and the Student Loan Marketing Association has taken about 12,000 square feet at 3953 Pender Dr., Fairfax. Julien J. Studley handled both transactions . . . Rouse & Associates has sold Fairfax Executive Park to Buvermo Management Inc., a Dutch group. Fairfax Executive Park, at the intersection of Routes 50 and 66, consists of four one-story and two three-story buildings totally 170,000 square feet. The price was not disclosed . . . B. F. Saul Co. has begun construction of a 53,000-square-foot office and R&D complex in Sugarland Business Park located in Herndon/Reston along the Dulles corridor. Occupancy is planned for early next year . . . Scientific Management Associates has leased 21,500 square feet of office space in Metro-Plex II in Landover. The firm is relocating from Riverdale. And Chrysler Corp. has taken 10,000 square feet in Landover's Corporate Plaza for its zone sales office, which is being relocated from Greenbelt. Coldwell Banker Commercial Real Estate handled both transactions.