1 Casuarina Concourse is under contract for $43.7 million, which would be the most expensive sale in Miami-Dade County in 2017. The home is being sold by Alan Potamkin, Co-Chairman of Potamkin Automotive Group. He purchased the property in 1987 for $2 million before later building the existing house in 2000. 1 Casuarina Concourse was originally listed for $67 million in May 2015. The home includes 20,682 SF spread over 9 bedrooms, 15 bathrooms, his and hers libraries, elevator, saltwater aquarium, boxing room, gym, spa & massage room, staff quarters and a 1,500-bottle wine room. Spread over 3-acres, the estate also features a koi pond, tennis court, beautifully landscaped pool, and over 1,000 SF of waterfront on Biscayne Bay.