Penthouse 70BCD at the Four Seasons Private Residences in Miami’s Brickell neighborhood will be sold by Platinum Luxury Auctions at a Luxury Auction without reserve on January 29th at 7p.m. EST. The penthouse was previously listed at $15M. The custom home is approximately 5,800 sq.ft. and a combination of 3 units which was done during initial construction and occupies half the building’s top floor.