PERSONNEL FILE . . . The Washington Board of Realtors has appointed David E. Strachan as its executive vice president, succeeding James G. Banks, who is retiring. Strachan comes to the board from the National Association of Personnel Consultants, where he was executive vice president. Before that, he was an associate director of the American Bankers Association for the areas of real estate finance, investments and international banking. Banks, who has been with the board for the past six years, plans to devote full time to pursuing personal business interests, but will continue to work with the board as a consultant on legislative and community development affairs . . . Robert J. Brown has been named senior staff vice president for builder and association services of the National Association of Home Builders . . . Home Federal Savings and Loan has named Donald E. Tillson director of marketing . . . Anthony Adams has been appointed real estate manager for Danac . . . Hamilton E. Loving has become vice president of Baier Properties Inc., a Rockville-based commercial real estate company . . . Delores Hoover, Carolyn Woodrum and Linda Truesdale have joined Rector Associates Inc., Realtors, in Alexandria.

IN THE BUSINESS . . . Interested in old houses? Wondering how to go about fixing one up? The Capitol Hill Brokers Council is sponsoring an afternoon of seminars, displays and demonstrations tomorrow at the Eastern Market, Seventh and C streets SE. The annual Old House Fair will feature information on everything from landscaping to hardware, plus entertainment, beer and a raw bar between noon and 5 p.m. For information, call 546-7600, 547-2202 or 543-6162 . . . And for builders--and anyone interested in houses--the Home Builders Associations of Suburban Maryland, Northern Virginia and the District of Columbia are sponsoring the 10th annual Builders Regional Trade Show Tuesday at the Sheraton Washington Hotel. The show will offer education and entertainment, and more than 200 displays and exhibits concerning all phases of construction, even including small computers designed for use in the industry. For information, call 434-6800 . . . The Northern Virginia Apartment Association will feature Gregory J. Friess of Colonial Village, Inc. as the speaker at its dinner Monday night. Friess will discuss redevelopment plans and goals for Colonial Village, which is a subsidiary of Mobil Land Development Corp. For information, call 671-6777 . . . H. Grady Stebbins, president of the International Society of Real Estate Appraisers, and Anthony Reynolds, president of the American Institute of Real Estate Appraisers, will address a joint session of the Washington area chapters of the two organizations Tuesday night. For information, call 384-1149 . . . Rairfield Homes has sold 115 houses in Reston's North Point and South Lakes Villages to become that community's leading builder this year. Fairfield has been emphasizing very traditional achitecture--Williamsburg and New England village styles--and has met with great success. It features three- and four-bedroom models, beginning at about $110,000 and ranging up to about $172,000 . . . NV Homes has announced the grand opening of its new luxury development in Potomac known as Stonebridge. Architectural styles offered are traditional colonial, split colonial and Victorian. Prices begin in the $140,000 range . . . The first of three buildings planned for Research Office Park has been topped out ahead of schedule. The seven-story, 146,800-square-foot building is receiving its facade, and should be ready for tenant work in December and occupancy in February and March. Rents are expected to be in the $16.50 range, including free parking. The development is being done by Prudential Insurance Co.; leasing is by Fred Ezra Co. . . . Sequoia Building Corp. has begun construction of a $35 million, 33-acre garden condominium and town house project on the southeastern portion of the Chiles tract near the intersection of the Beltway and Route 50 in Virginia. The development will feature a 4.5-acre lake.

ON THE MOVE . . . Nonprofit Human Resources Research Organization (HumRRO) has moved its corporate headquarters to a new, three-story, 38,000-square-foot building at 1100 S. Washington St. in Alexandria. In addition to its headquarters, the new building also will house HumRRO's Performance Research Division and part of its Training Research Division. Smith-Braedon was the leasing agent.