Noted art dealer Laurence Gagosian put down nearly $13 million for a penthouse at the 18-story, 42-unit tower Faena House, according to Miami-Dade County records. The Armenian American art collector owns the Gagosian Gallery art galleries in the United States, as well as London, Paris, Rome, Athens, Geneva and Hong Kong. Spanning 4,730 interior square feet (which translates to $2,747 per square foot), the penthouse comes with four bedrooms, six bathrooms and one half-bath as well as a 1,516-square-foot terrace. Designed by Foster + Partners, Faena House, at 3315 Collins Avenue, is the first of four planned oceanfront condo towers for developer Alan Faena.