Plans are under way for the development of the 80-acre Frederick Office and Research Park. Construction on two, 50,000-square-foot buildings is tentatively scheduled to begin in early 1984. There are about 25 building lots available in the park, depending on demands of future tenants.

The office park tract stretches from Interstate Route 270 to Maryland Route 355 with about 900 feet of frontage on Route 270 and 1,800 feet on Route 355. Access to the park will be from two entrances on Route 355.

Crown American Corp., of Johnstown, Pa., is the owner and developer of the Frederick Office and Research Park. In 1976, Crown purchased the old 209-acre Harding estate located at the interchange of Interstate 270 and Route 85 for the purpose of developing, besides the office park, the already completed Francis Scott Key Mall and the Frederick Sheraton Inn. The office park tract adjoins the Sheraton Inn.

Recent developments in commercial realty in the Washington metropolitan area:

* Ground has been broken on the 12-story Silver Spring Business Center project at 8737 Colesville Road. Financing for the project is being provided by First Maryland Savings & Loan, which will relocate its headquarters to the new building. Completion of the project is expected in summer 1984.

* Ground has been broken in Maryland on the 120,000-square-foot Burtonsville Office Park at the intersection of routes 29 and 198. The first building of the 4.5-acre condominium office park will contain 20,000 square feet of space. The 5,000-square-foot units are for sale or lease. The developer is Phillips/Stevens & Associates Inc. of Columbia.

* Social and Scientific Systems has leased an additional 16,433 square feet at its Bethesda location at 7101 Wisconsin Ave. The computer systems development company has consolidated its Washington office with the Bethesda operations.

* Williamsburg Deli & Donuts has leased 540 square feet at the Williamsburg Shopping Center at 2900 N. Sycamore St. in Arlington. The aggregate rental value of the lease is about $75,000. A Touch of Tan, a sun tanning salon, has leased 600 square feet at the same address.