Arthur and Will Zeckendorf, developers of Fifteen Central Park West, have announced plans to market a $100 million penthouse at their next tower, 520 Park Avenue (rendering at right), a deal many years in the making, many details of which were first revealed in House of Outrageous Fortune. Read the Real Deal’s report on it here. Could this be the first NYC $100 million sale I predicted in the last issue of Departures? Only time will tell.