Mashta Island Homes for Sale

Mashta Island is a residential community in Key Biscayne, Florida.

Pure Equity Realty covers Mashta Island and the Key Biscayne area. We list for 1%, which includes photography, MLS syndication, and negotiation support. Buyers pay nothing for representation. For current market data, see Florida Realtors' market statistics.

Our MLS feed shows 2 Mashta Island Key Biscayne homes for sale as of October 2026. The median asking price is $17.6M. Asking prices run from $16.8M to $18.5M.

That is 609% above the Key Biscayne median of $2.49M. On a per-foot basis, homes here ask about $6,422 per square foot, compared with $1,151 across Key Biscayne. So the median price buys roughly 2,750 square feet of living area. With so few listings, though, treat these figures as a snapshot rather than a trend.

Listings here have averaged 121 days on the market. That tracks the Key Biscayne average of 130 days, so pricing and terms follow the wider city market.

Homes listed in Mashta Island date from 1958 to 1968. That puts them between 58 and 68 years old.

All of these homes predate Florida's 2002 statewide building code. So roof age, window protection and the wind mitigation report matter a great deal for insurance.

In addition, most Florida insurers ask for a four-point inspection on homes 30 years or older. It covers the roof, electrical, plumbing and HVAC. Updated systems usually make coverage easier to place.

Rentals in Mashta Island have a median asking rent of $15,750 per month, across 2 active rental listings. For comparison, the Key Biscayne median is $7,900, so rents here run 99% higher.

You can browse current Key Biscayne rentals or ask us for a rent estimate on a specific Mashta Island home.

Here is what the median Mashta Island price means in Florida closing terms. At $17.6M, a 20% down payment comes to about $3.53M, leaving a loan near $14.1M.

Florida then taxes that loan twice. First, documentary stamp tax on the note runs 35 cents per $100, or about $49,420. Next, the intangible tax of 0.2% adds about $28,240. Buyers normally pay both at closing.

On the seller side, Miami-Dade charges deed stamps of 60 cents per $100 on a single-family home, about $105,900 at this price. Condos and other property types pay a higher rate.

Finally, owner-occupants should file for the Florida homestead exemption by March 1. It removes up to $50,000 of assessed value. After that, Save Our Homes caps yearly assessment increases at 3% or inflation, whichever is lower. To see what these numbers mean for your budget, get pre-approved before you tour.

Recent Mashta Island listings show assignments to Key Biscayne K-8 (elementary), Ponce De Leon (middle) and Coral Gables (high). However, boundaries can change each year, so confirm the assignment for a specific address with Miami-Dade County Public Schools.