Developer Kenneth H. Michael disclosed his "concept" plan for the Greenbelt "Golden Triangle" and, after five years of struggle over the future of the site, came up with a design "acceptable" to everyone involved.

Michael's plan, presented to Prince George's County Council members this week and to Greenbelt cry officials last week, calls for a 20-story needle-thin office building, a 400-room motor inn, a banquet-type restaurant, several small office buildings, a drive-in bank, a service station and Capital Cadillac, a cadillac dealership. The area will be fronted by a small lake and will be serviced by two feeder roads.

The Greenbelt "Golden Triangle," so-called because the 55-acre pilot is shaped like a traingle with Greenbelt Road at its base and Kenilworth Avenue and the Beltway on its sides, is one of the many triangles of prime undeveloped land in the country.

Michael, the Cheverly-based developer for owners Kravco Co. of Philadelphia, has been working with county planners. Greenbelt officials, the Maryland Department of Transportation, the Washington Suburban Sanitary Commission and the Prince George's County Council for several months to produce an overall general plan for the area.

Development of the site, reported to be worth $100,000 an acre, has been held up because of proposed road changes, slowed-down growth activity in the area, and the city of Greenbelt opposition to what many officials called "piecemeal developmnt of the area.

Robert Borth of Walton, Madden & Cooper, architectural designers contracted by Michael, said he "tried to look at the area thoughtfully" before considering the site plan. He said the development will begin in stages with the first activity on the side near the beltway.

Capital Cadillac will be the first to build in the area, Michael said, and will be what Michael called "a model facility" with "outdoor displays in a loop visible from the beltway." Micahel is now bidding on a contract wth "two nationally known computer firms" for the southeastern side of the property.

A "showpiece" for the development would be a proposed 20-storey office building, which would be built on the highest part of the triangle and would have a rooftop restaurant.

Construction of his own 60,000 square foot office building is scheduled to begin with a completion date in March, Michael said. "It should cost $3 million, and when I'm investing that kind of money . . . you can see the kind of serious intentions I have" for the property.

"But," Michael stressed again and again throughout the meeting, "this is a conceptual plan. Things might change. If I can't market it, I'm not going to move on it. We've got to move on it. We've had it for five years and we are ready now to start developing."