It was inevitable that Fifteen Central Park West would have to give up its crown as Manhattan’s most expensive building, but its seven-year run has nonetheless been impressive, and the building that finally usurped it owes it and its developers, Will and Arthur Zeckendorf, Eyal Ofer‘s Global Holdings, and Goldman Sachs, a great debt of thanks for setting the stage for the emergence of the Billionaire’s Belt that now girds fat-cat Midtown Manhattan, stretching from 15CPW at West 61st Street’ along 57th Street, past Beacon Court and on to two East Side towers by Sir Norman Foster, 50 United Nations Plaza, now filling up on the corner of East 47th Street and First Avenue and 100 East 53rd Street (now rising at Lexington Avenue). CityRealty’s 100 Report, released today details the state of luxury development–and makes fascinating reading, whether you approve or not. The background of this luxury boom–a story in which presidential canditate Donald J. Trump also looms large–is told in full in House of Outrageous Fortune. Now, the big question is: How long will usurper One57 hold the apartment sales throne? Will even newer buildings like 432 Park, 220 Central Park South and 520 Park cut Extell’s erection down to size? Watch this space.