The late Pat and William F. Buckley’s $24.5 million duplex maisonette at 778 Park Avenue is a very proper co-op (it includes a “staff changing room,” according to a listing), with a very proper provenance (he the blue-eyed patriarch of conservatism, she the 6-foot-tall society doyenne), in a very proper apartment house (Brooke Astor’s old duplex is upstairs).
Yet selling the co-op hasn’t been smooth. It has been marketed only unofficially, according to two sources,...
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