Just as the stars of the champion Boston Celtics of the 1980s eventually left one by one, the start-up team of Residential Services Corporation of America is losing its third member to retirement.

Howard B. Culang, whose last position at Residential Services was vice chairman, is retiring at the end of this month. He said he plans to start a small investment bank with a former colleague from his days at Citibank. He also plans to open a health club with an emphasis on teenage athletes, he said.

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