The 15-room duplex, listed with Sotheby's brokers Serena Boardman and Meredyth Smith for $23 million, is now in contract, according to the Olshan Luxury Market report (it was also last week's biggest residential contract, broker Donna Olshan reveals).

The deal, coming close on the heels of the record-for-a-co-op sale of Courtney Sale Ross' apartment to Oaktree Capital Chief Howard Marks, means the end of available units at the most venerated of all New York addresses.

It's unclear why apartment 4/5 C, which belonged to June Speight—widow of the one-time co-op board president Randolph Speight, a gate-keeper more feared and admired than St. Peter—took so long to sell. Perhaps it was the apartment's entrance at 71 East 71st Street, as Curbed speculated, or maybe it was haunted by the Speight's ghosts, unable to depart the earthly realm until a buyer with sufficiently blue blood was found?

The four-bedroom apartment certainly ticks all the 740 Park boxes. There's a private elevator landing, a "vast marble gallery," a "baronial living room" and a "handsome walnut-paneled library." Really, it sounds like the perfect place for a person of the proper pedigree.

Perhaps the apartment just had the bad fortune to be listed not long before the recession? Or maybe a fresh coat of paint and the removal of Ms. Speight's fusty furniture—visible in the new listing photos—did the trick? After all, even in apartment buildings with the most celebrated histories, a buyer has to be able to visualize the future, or you end up living in River House.

kvelsey@observer.com