W Hollywood penthouse, at 25,000 sq. ft., on market for $45 million

Even by L.A. standards, this one is a jaw-dropper. With four bedrooms, eight bathrooms, and stunning views of pretty much everything, the 15th floor property is part of the 143-unit W Hollywood residences complex (other units range from a measly $800,000 to $3 million). Only two-thirds of the units have sold, which tells you that the condo-on-top-of-luxury-hotel craze hasn't been a huge hit with buyers. The $45 million penthouse seems like an especially tough sell. As reported by the WSJ:

It includes a ballroom that can fit 250 people, a wine room and wine vault, a screening room with LCD projection, a solarium, a gallery and a pub-style tap room. The nearly 4,000-square-foot master suite has a fireplace, entry foyer and oversize walk-in closet and dressing room designed to look like a Ralph Lauren store, says Richard Robertson III, the apartment's architect. The unit also includes a fitness center with an attached beauty parlor, a library, 17 valet parking spaces and a reception area with separate women's and men's powder rooms.