Scarce waterfront assets sustain Key Biscayne luxury pricing

Key Biscayne’s highest-value opportunities continue to be driven by land scarcity, frontage, views, condition, and redevelopment potential rather than broad building averages. A $19.9 million Mashta Island offering includes 138 feet of Biscayne Bay frontage and approved seawall and dock plans, while Oceana resale evidence shows substantial unit-level variation. Asking-price and listing-page data should be separated from verified closed-sale performance.