The 17,978 square foot Penthouse I at Oceana Key Biscayne just hit the market today for a whopping $25 million. Surrounded by deep balconies, glass walls, and gorgeous views, the huge unit is Key Biscayne’s most expensive listing at the moment, and the only penthouse currently on the market on the island, or so we hear.

The unit has a pool, but besides that is a white box inside, so whoever buys it should probably bring an interior designer. The building itself, a minimalist glass box ringed with balconies, was designed by Arquitectonica’s Bernardo Fort-Brescia, and the common areas were done by interior designers Yabu Pushelberg. The minimalism even extends to the large and perfectly square pool by the beach. It also has a square breezeway on the ground floor, which you can’t see in the pictures. The unit is listed by Saddy Delgado with ONE Sotheby’s International Realty.