A historic Georgetown school building at the corner of Wisconsin Avenue and 33rd Street NW has been restored into offices by the Wynmark Development Corp. for the Carley Capital Group, a major real estate investment firm.

Wynmark, which has restored a number of historic properties in the District for commercial use, including the former home of Theodore Roosevelt on 19th Street NW, bought the 73-year-old school in November 1983 for $686,349 from Parkmont School Inc. Carley, the only tenant, will rent the building for an undisclosed sum.

Wynmark partner Mark Griffin said the school building is an example of an historic property "whose architectural and historic value can be retained while put to efficient contemporary use."

As in most of Wynmark's restorations, much of the interior of the two-story building was restored, rather than gutted, which is usual in renovations. Architect James B. Bayley kept such interior features as precast metal cornices and marble flooring in the neo-Georgian structure, said Griffin.

The school, at the very edge of Georgetown's historic district, was built in 1911 as a high school for the teen-age girls of Georgetown. The District of Columbia school system converted the building into offices in 1950, then sold it as office space in 1954. In the late 1970s, the old school building was taken over by Parkmont, a private secondary school, which put it up for sale in 1983, after moving to new quarters further up Wisconsin Avenue.

The Carley Capital Group was ranked as the 37th largest diversified developer in the United States in 1983, according to a release issued by Wynmark. The company also has investments in cable television, publishing and financial brokerage.

The Montgomery County Planning Board is recommending that a federal agency turn down a plan by the U.S. Postal Service to add an indoor firing range and two parking lots to its management training facility in Potomac.

The National Capital Planning Commission will make a final decision on the additions sometime in the next few weeks, said Thomas V. Robertson, county planner.

Thompson said the Postal Service had requested the county planning board approve a number of modifications to the 80-acre facility, including the construction of a gardner's shed, tennis courts and a handball field. The board agreed to those additions, but balked at plans to increase parking from 220 spaces to 414 spaces and to construct the indoor firing range.

"When the facility was approved in 1981, the Postal Service promised the board it would use mass transportation in an effort to keep parking lots at a minimum," said Thompson. He said Potomac neighbors and board members also were concerned about the safety of the indoor range.

Postal Service spokeswoman Meg Harris said the facility does run shuttle buses to Metro stations, but said the 194 extra parking spaces are sorely needed.

"This facility was planned in the late 1970s, at the height of the gas crunch," she said. "We underestimated the number of people who would bring their cars." She said approximately 12,000 Postal Service employes from all over the country take one- to three-week courses at the facility each year.

Harris said the indoor firing range is needed to train Postal Service security guards. She said the guards now train at a number of government and military firing ranges but said it would be more convenient for the Postal Service to have its own range at Potomac.

PERSONNEL FILE . . . Warren Lasko, currently executive vice president of the Government National Mortgage Association, has been named executive vice president of the Mortgage Bankers Association of America. Lasko, who has been acting president of Ginnie Mae since November, will take his new post Feb. 19. He succeeds Mark J. Riedy, who has become president of the Federal National Mortgage Association . . . Fannie Mae itself has named three new directors: Riedy, Felix Beck, head of Margaretten & Co., a New Jersey-based mortgage banking company, and Christopher J. Sumner, head of Western Savings and Loan Co. of Salt Lake City . . . Fred Hetzel, president of Fred Hetzel and Associates of Leesburg, has assumed the presidency of the Virginian Association of Realtors . . . Promotions and additions at John G. Georgelas and Sons: Loran M. Adams has been promoted to executive vice president; Tom Newman and J. C. Richards have been promoted to vice presidents for commercial development; Anthony J. Georgelas has become vice president and director of residential construction; Steven Watts has joined the company as controller, and James Morehead, the former controller, has become president of Premium Management Co., a Georgelas subsidiary . . . Arthur G. Greenberg has joined Sequoia Building Corp. as director of finance . . . Charles W. Graybeal has been named a vice president of Dallas-based Rosewood Properties and will open a regional office for Rosewood in Washington . . . Kevin McCall has been named vice president and David M. Hassler assistant vice president at Spaulding & Slye.

IN THE BUSINESS . . . Shannon & Luchs reports that 1984 was its best year ever, with 11,048 home sales for a total volume of just under $3 billion . . . Coldwell Banker Residential Real Estate Services has acquired the Riverdale firm of Harloff & Perkins Inc. The firm is to become Coldwell Banker's College Park office . . . Building Design Construction magazine has ranked Dewberry & Davis as the nation's 14th-largest engineering and architecture firm.