June 24, 1984

Mary Decker, the world's most successful female distance runner, made the United States Olympic team tonight. So did August Wolf, a 1983 Princeton graduate who until three months ago was a journeyman shot-putter. Their heroics excited the crowd of 20,247 watching the United States Olympic track and field trials at the Los Angeles Memorial Coliseum, the site of the Olympic competition six weeks from now. But nothing caused more stir than the blanket finish in the women's 100-meter hurdles.

Soon to rise on a 24-acre site embracing a large piece of blighted urban renewal land in Glen Cove, L.I., will be a 328-unit residential condominium complex called Captain's Cove, overlooking Hempstead Harbor. The condominium project, off Dickson Lane, is part of a $100 million development program for the city by the GEO Group of Glen Cove and its subsidiaries.

-room Mediterranean style villa filled with priceless antiques might sound dramatic, but Michael Sweeley has become used to the experience. ''In a sense, I'm living over the store,'' he said, smiling, standing in a room whose vaulted ceiling was once part of a 16th-century Italian castle. ''A very grand store, but still, living over the store.'' Mr. Sweeley is executive director of Caramoor, the museum in Katonah that once was a private mansion and is each summer the site of the Caramoor Music Festival. Saturday, the festival opens its 39th season, and Mr. Sweeley begins his 30th year coordinating the event.

LOS ANGELES LAURIE FLACHMEIER spent her first week off since last Thanksgiving relaxing. Well, even sailors get to go on leave now and then, so why shouldn't the United States women's volleyball team be entitled to a few days of R & R? But while Miss Flachmeier was lying in the sun recently, resting her weary bones, her mind continued full speed ahead, cluttered with Olympic thoughts swirling around in an emotionally draining whirlpool. It occurred to her, she said, that it probably would be foolish to pretend she was just a college girl on a summer break. Living as she does near the volleyball team's permanent training center at Coto de Caza, Calif., there really isn't any way that she could avoid thinking about the Los Angeles Olympic Games or seeing physical evidence that they are close at hand. ''There are so many commercials on TV that it's not going to slip your mind,'' Miss Flachmeier said. ''There was a Saturday when I was driving in my car, watching people go past and I looked at them and thought, 'This is an ordinary day for an ordinary citizen. But in six weeks, I'll be in the Olympics.' I wondered whether there could be anything in their lives that could be like this.''

IN the last five years, condominium and cooperative apartments in prewar town houses, once viewed as the choice of just a few idiosyncratic developers and buyers, have become a significant part of New York City's private housing market. Brokers, developers, and housing experts say the number of owner-occupied apartments in town houses is substantial and growing, although there are no statistics to measure their popularity and acceptance. They can be found in all of the city's town- house and row-house neighborhoods, in Chelsea and Greenwich Village as well as the Upper East and West Sides in Manhattan and in Fort Greene, Clinton Hill and Boerum Hill as well as Park Slope and Brooklyn Heights in Brooklyn. ''The town-house condominium and cooperative market is very strong,'' said Neil Binder, a broker with Bellmarc Realty. ''People want to buy, and many buyers who won't accept an apartment in an elevator building without a doorman will accept one in a town house.''