Mashta Island A
Homes for Sale in Key Biscayne, FL

This is a small, specifically platted section within Miami-Dade County, and the current MLS feed does not show enough recent transaction volume to describe a market pattern with any confidence.

MIAMI REALTORS sales records identify 13 homes in MASHTA ISLAND A that have changed hands since 2021, built between 1960 and 2014 (median 1969), with a median living area of about 4,290 sq ft and a typical 4-bedroom, 5-bath layout; 100% are single-family homes. Source: MIAMI REALTORS closed-sale history compiled by Momentum Research; counts reflect homes with a recorded MLS sale, not every home in the community.

Pre-construction details are compiled from public records, builder announcements and builder listings, and are subject to change without notice; figures are deemed reliable but not guaranteed. Momentum Research figures are our own analysis. This page describes homes, pricing and community attributes, not residents.

Mashta Island A is too small for its own price trend, so here is the market around it.

In ZIP 33149, 158 homes are on the market and 15% are under contract — a slower corner of Key Biscayne.

Across Miami-Dade County, 15,314 homes are active and 3,367 pending (18% under contract).

In ZIP 33149 (Key Biscayne), 134 homes closed in the last 12 months at a median of $1.49M ($921/sq ft), up 18.0% year over year, with a median 77 days on market. Right now 61 active and 13 pending listings — a buyer's market. See the live ZIP 33149 housing market and the Miami-Dade County market.

ZIP and county figures describe the wider market, not Mashta Island A specifically. Momentum Research analysis of MLS records.

A closings count of zero for the tracked window is itself informative. It tells you this is not a high-turnover pocket where you can lean on the last few sales to set expectations — there simply are not recent MLS-recorded transactions to reference for this specific replat.

The same applies to amenities: nothing is identified from current listings, which likely reflects what agents have chosen to list rather than a confirmed absence of features on the ground. Either way, the honest move is to treat this community as a research project, not a spreadsheet lookup, before making any pricing or offer decisions.

In a pocket this thin on recent MLS activity, the value we add is legwork the dashboards cannot do — pulling comparable sales from adjacent areas, checking county records directly, and confirming what amenities and terms actually apply before you commit to a number.