Perhaps there's no better time than sweltering early summer to market a unit in Shigeru Ban's Metal Shutter Houses, since the building has built-in shades to help it face off against the neighboring starchitecture. Now testing that theory is the building's penthouse. It first came on the market in 2007 with an asking price of $10.5 million. We assumed the apartment was spoken for, like all of the building's units. But we don't see a closing recorded, so we're not sure whether the new listing is a flip or just a fresh attempt at relisting an unsold condo. Either way, the ask is a whopper at $12.95 million. At 3BRs, 4BAs, and 3,319 square feet, that works out to $3,901/square foot.