Even though billionaires dropped a shitload of money on luxury real estate in New York City this year, many of the year’s most expensive listings still remain on the market. Like? The $100 million City Spire penthouse, the $95 million Sherry-Netherland Listing, and the $95 million combo at 15 Central Park West. Predictions for 2013: will they be pricechopped or purchased? [NYT]