This utterly unreal five-story penthouse at 45 East 30th Street has been on the market for the better part of a decade. When it first came on the market in the late summer of 2006, the 4,400-square-foot sky palace was asking a whopping $12M. Since then, the neighborhood has seen a revival and this penthouse has only seen its price repeatedly chopped. By February 2011, the four-bedroom spread was asking $6.75M. Now, it's been chopped again to $6M and popped up on the rental market to boot. The asking price? A heady $30,000 per month. Does this place have a chance as a high-priced rental? Maybe if the swimming pool on the floor plan actually exists, but sadly, it didn't make the listing photos.