Recently, at a dinner party, I listened to our hostess, who is Jewish, converse with my husband about the Fifth Avenue buildings in which they grew up. Our hostess noted that even though my husband’s parents were Social Register WASPS, they chose to live in a building that, like her family’s, was not “restricted.” Does anyone recall the meaning of this once-commonplace euphemism? At least until the 1970s, and in some cases, beyond, certain apartment buildings and hotels in New York banned Jews. Our hostess still has a map seared into her brain of the Upper East Side co-ops that...