An Upper East Side co-op board has sued sponsor Frost Equities, alleging the development firm failed to sell the vast majority of its units 25 years after converting the building from a rental. Frost Equities, led by general partner Robert Singer, controls nearly 33 percent of the shares of 1160 Third Avenue, according to the suit, filed Nov. 6 in New York State Supreme Court. With such a large stake in the sponsor’s hands, board members [more]
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