Two unreleased penthouses in Brooklyn’s tallest tower, 388 Bridge Street, will soon come to market as an optional two-condo combo apartment. If someone choses to purchase the $4.538 million duplex 52F and $5.124 million 53B to make a combination penthouse, it will be the highest triplex apartment in the borough as well as the priciest apartment in the building. That being said, all legwork to combine the apartments will be on the buyer the combination of the two apartments can be handled by the buyer, or may be aided by the sponsor, determined on a case-by-case basis. The most expensive single listing in the building will be the $6 million 53A (PDF!).