PERSONNEL FILE . . . Roy G. Green has been appointed Washington director of the U.S. League of Savings Institutions. Green, currently president of First Federal Savings and Loan of Jacksonville, Fla., and immediate past president of the league, will be responsible for legislative and regulatory policy development and government relations activities . . . Shannon & Luchs has named Barbara Stone manager of its new residential sales office in White Oak. The office is the firm's 27th and will serve eastern Montogomery and northwestern Prince George's counties . . . Merrill Lynch Realty/Chris Coile Inc. has named Joe Kaplan, Marie Shannon and Willie Gutridge "managers of the year," an honor that nets each of them and their spouses an all-expense-paid trip to the Bahamas.

IN THE BUSINESS . . . Gross sales of houses and condos totaled 2,100 in the Washington area in January, according to Housing Data Reports, up 38 percent from December and 34 percent from a year ago. In fact, the figures are the best Janaury total in a decade, HDR says. At the same time, the Northern Virginia Board of Realtors reports that in its area, at least, the boom continued through February, resulting in a 37 percent improvement over the first two months of 1982. The average price in Northern Virginia in February was $104,300; it was $104,552 last year . . . Better Homes Realty Inc. announces that Cardinal Realty Inc. is merging with Better Homes' Springfield location. The acquisition is Better Homes' eighth in two years, according to President Thomas G. Shafran. Robert L. Inman, president of Cardinal, and 25 sales associates will be joining Better Homes . . . The Montgomery County Board of Realtors will present Jeffrey Radowich and John Cogar Wednesday in a seminar on "Practical Tax Planning for the Realtor." For information, call 933-3200 . . . The D.C. Builders Association's dinner meeting Tuesday will feature speakers from Washington Gas, Pepco and Steuart Petroleum on "What's the Best Buy and Why" in energy. Information: 966-8665 . . . The Washington chapter of the Community Associations Institute is presenting a leadership training program for people involved in condo or homeowner associations. The program is scheduled for next Saturday and the following Saturday. Information: 684-8654 . . . The Real Estate Expo will be held Thursday through Sunday at the new Washington Convention Center. Displays range from geodesic domes to log cabins, and there will be daily seminars on such topics as home buying, construction and solar design. Admission is $4. Call 537-1000 for tickets.

ON THE MOVE . . . The New York law firm of Lane & Mittendorf has leased 5,700 square feet at 1750 K St. NW for its Washington office, currently located at 815 Connecticut Ave. NW. Fred Ezra Co. represented the firm in the transaction . . . Construction and permanent financing of $500,000 each has been arranged by National Capital Corp. of Washington for an offshore corporation that plans to build a 7,600-square-foot retail and office building on the west side of the 2400 block of Wisconsin Ave NW. in upper Georgetown.