Nearly three years after the first owner-occupants moved into the Fort Lincoln new town in Northeast, the 360-acre community is introducing the first section of new one-storey units for adults.

Located in three-storey buildings with a total of 10 dwelling units, the Summitt Villas section of Fort Lincoln already offers two-bedroom and three-bedroom living units ranging from about $55,000 to $62,000. Nine buildings are planned. The buildings, located near two new high rises for senior tenants, are near a supermarket, a pharmacy, a dental office and a medical officer center operated by Providence Hospital.

Introduction of an adult neighborhood in Fort Lincoln coincides with the continued growth of this area's first all-adult community, Rossmoor, in Montgomery County, and the recent openings of Crestwood Village for adults in the Frederick area and Heritage Harbor near Annapolis.

Theodore R. Hagans, principal developer and president of Fort Lincoln said 270 units in Fort Lincoln now are occupied by owners and 484 rental apartments for elderly persons are also part of the growing complex at SouthDakota Avenue and Bladensburg Road NE.

Also currently available at Fort Lincoln are the Hillside Village condominiums priced to $97,500. These units, with two fireplaces and 2,000 square feet of finished living space, have been the best sellersa along with a two-bedroom unit selling for $68,500, according to H. Ralph Taylor, executive vice president of the development.

Taylor added that a sic-acre park, to be maintained by the National Park Service, is nearing completion on a hill. Visitors can sit on benches there and see such landmarks as the Washington Monument, the Capitol and the National Arboretum. Eight tennis courts have been completed in the 10-acre recreation area. CAPTION: Picture 1, An overall view of the new town of Fort Lincoln, by Joel Richardson-The Washington Post; Picture 2, tennis courts.