A non-waterfront home on Key Biscayne’s exclusive Mashta Island has sold for $7.3 million, setting an all-time record price-per-square-foot of $1,728 PSF as well as a land value record. Located at 730 N Mashta Drive, the recently listed home was sold in just 4 months by agent Joan Bruggink with ONE Sotheby’s International Realty.