Key Biscayne is a barrier island, and that physical limitation is the strongest value driver in the market. The Rickenbacker Causeway is the only road access. Buyers cannot simply go one block farther west and find a comparable address. That sense of entry and separation is part of why buyers pay the premium.
Venezuelan and Colombian communities have shaped this market significantly. Many buyers know the island personally, and that familiarity creates stable demand that is deeper than generic luxury tourism. Latin American families seek Key Biscayne for its combination of privacy, safety, schools, marina access, and village identity. That buyer loyalty persists even when broader luxury markets become more selective.
For short sales, scarcity is a concrete argument. Lenders know island inventory is finite and that properly marketed homes can attract serious attention quickly. That does not remove the need for strategy, but it creates excellent conditions for approval when the file is prepared well and the island's genuine advantages are presented clearly.