New York penthouses lead the list of the world’s most expensive and rarest properties. Barely a hundred penthouses number amongst the more than 2,300 upscale NYC apartments currently up for sale. And the prices for these properties are no less astonishing than the views from their terraces; the most expensive penthouse available in New York today is listed for $90M, and 50% of the rest lie within the $30M-75M range.