Assa Properties is auctioning a triplex penthouse at 70 West 45th Street, Midtown West, after failing to sell it for $50 million. The minimum reserve bid is $30 million. The 8,000-square-foot triplex spans three units in the Cassa Hotel and Residences, featuring 13 bedrooms, 10 bathrooms, three powder rooms, and office space. The auction is set for November 13, conducted by Paramount Realty USA. The units can also be bought separately, with reserve bids between $10 million and $12 million each.