3 East 85th Street $749,000. One-bedroom, one-bath co-op with 760-square-foot terrace. Brokers: Scott Varga and Luke Evans, Corcoran. Photomontage by Caroline Shepard

This petite penthouse was added, cake-topper style, on the roof of a genteel limestone co-op building in the late forties. The interiors cover a little over 600 square feet, with a tiny kitchen; the wraparound terrace’s 760 square feet look right over the Temple of Dendur and out to Central Park West. By the peculiar logic that adheres to prestige buildings, one broker claims that if the apartment carried an actual Fifth Avenue address it would fetch $2 million.

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