Mashta Island
Homes for Sale in Key Biscayne, FL
All 74 homes for sale in Key Biscayne, FL · median $1,237,000 · 143 homes for sale in 33149 · Miami-Dade County homes for sale
True comps, carrying-cost math, and listings before the portals.
Photo via MIAMI MLS
As of November 2026, Mashta Island in Key Biscayne, FL has 2 homes for sale. As of November 2026, the MLS records 1 closed sale in Mashta Island in Key Biscayne, FL, the most recent in August 2026. Across Key Biscayne as a whole, 35 homes closed in the last 12 months at a median of $1,480,000, 79 median days on market, with 34 homes for sale today. At that median and Miami-Dade County's FY2025-26 rate of 17.59 mills, annual property tax runs about $26,040 ($25,320 with the full homestead exemption).
Mashta Island shows almost no transaction volume in the current snapshot, which means there is not enough closed activity right now to draw a reliable read on pricing or pace. That thinness is itself the headline: this is a market where you negotiate off comparable evidence you assemble deal by deal, not off a running average.
For a seller, low turnover can work in your favor if you are patient and your home is genuinely distinct, but it also means you cannot lean on a recent-sales narrative to justify a number. For a buyer, it means doing homework beyond the MLS snapshot, because the public data here will not tell you much on its own.
Figures in this note are as of July 22, 2026. The live market numbers elsewhere on this page update nightly and are newer.
The 60-Second Overview
Mashta Island sits within Miami-Dade County, and current MLS data reflects very limited recent closing activity, which limits what can be said about pricing trends here with confidence.
MIAMI REALTORS sales records identify 24 homes in MASHTA ISLAND that have changed hands since 2010, built between 1960 and 2020 (median 1988), with a median living area of about 4,615 sq ft and a typical 5-bedroom, 5.5-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.
Who Mashta Island is best for.
Best for
- A buyer willing to do independent diligence rather than lean on market averages
- A seller prepared to price based on property-specific merit rather than recent comps
- Someone comfortable with a longer, more deliberate transaction timeline
Probably not for
- A buyer who wants a large set of recent comparable sales before making an offer
- A seller expecting a fast, high-volume market to move a listing quickly
- Anyone relying solely on listed amenities to define the community
The market around Mashta Island
Mashta Island is too small for its own price trend, so here is the market around it.
In ZIP 33149, 147 homes are on the market and 14% are under contract — a slower corner of Key Biscayne.
Across Miami-Dade County, 14,507 homes are active and 2,241 pending (13% under contract).
In ZIP 33149 (Key Biscayne), 35 homes closed in the last 12 months at a median of $1.48M ($939/sq ft), with a median 79 days on market. Right now 34 active and 6 pending listings put supply at about 11.7 months — a soft 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 specifically. Momentum Research analysis of MLS records.
Homes For Sale Right Now in Mashta Island
Live MLS inventory for Mashta Island. Every active listing, what is under contract right now, and the last 12 months of closed sales, refreshed twice a day. Closed comps beat an algorithm's guess every time.
Active and pending Mashta Island listings as of 2026-11-10, priced high to low. Based on information from the Southeast Florida Multiple Listing Service (SEFMLS) or from MIAMI Association of REALTORS(R) for the period 2026 through 2026. Tap any home to ask about it.
The Mashta Island buying strategy.
If we were buying in Mashta Island today, this is the order of operations we would run for our clients.
Underwrite the condition first. Price the roof, HVAC, and systems honestly before judging any list price; condition swings value here more than square footage alone.
Match the home to real comps. Recent sales of similar condition and lot, not the asking price, tell you what a home is worth.
Move deliberately, not desperately. Neither side has a decisive edge, so a well-prepared, fairly-priced offer wins without overpaying.
Line up financing and inspection early. A pre-approval and an inspection plan let you act fast and negotiate from evidence.
Keep an agent in your corner. The listing agent works for the seller; we represent you and prepare a hand-built valuation before any offer in Mashta Island.
A market with thin data
With only a single closing captured in this window, Mashta Island does not offer the kind of transaction volume that supports a confident pricing narrative. Any claim about value here should be treated as provisional until more closings accumulate.
No community amenities are currently identified from active MLS listings, which does not necessarily mean none exist, only that they are not being surfaced through listing data at this time. Buyers and sellers should verify amenities and any association details directly rather than relying on the feed.
The location and the amenities are priced into every listing in Mashta Island. The deal is won or lost on condition, the comps, and the renovation math.
Why work with Momentum here
In a market this thin on public data, the value of local representation goes up, not down. We track off-market context, recent activity that has not yet closed, and property-level detail that a standard search will not surface, so you are not pricing or negotiating blind.
Mashta Island in 15 seconds.
Tools for a Mashta Island buy.
Free calculators to pressure-test the real cost before you tour.
Selling here is won on condition and pricing to real comps, not an automated estimate. The right number comes from closed Mashta Island sales matched to your home.
Price it to the comps and condition, not an automated estimate.
If you are thinking about selling in Mashta Island, the right list price comes from recent comparable sales matched to your home's condition and location, not an automated estimate.
What is your Mashta Island home worth?
Get a no-obligation home value based on real comparable sales in Mashta Island, not an automated guess. Tell us about your home and we will personally prepare your numbers and a pricing strategy. No obligation, no spam.
See all homes for sale in Key Biscayne →
Should you buy in Mashta Island?
An honest fit check. We will tell you when it is not your community.
Data sources & freshness
| Live listings | MIAMI MLS, refreshed twice daily (last: November 10, 2026) |
| Under-contract shares | MIAMI MLS records, as of 2026-11-10 |
| Historical depth | Closed-sale records back to 2026 (1 transactions analyzed) |
Verify the primary sources yourself: Florida DOR · U.S. Census · FEMA flood maps · Citizens Property Insurance.
Momentum Research figures are our own analysis of MIAMI MLS records; MLS data is deemed reliable but not guaranteed. Methodology: how Momentum market scores are computed. Market metrics describe homes for sale and recent sales, not residents.
Recent Developments in Mashta Island
Development, infrastructure, retail, and school activity affecting Mashta Island, tracked by our team and summarized from public reporting and official sources, with links to the original coverage. Last updated November 2026.
- October 2026Parks & Amenities
Coral Gables extends Art Cinema lease and moves toward Aragon Avenue expansion
The commission extended the cinema operators' lease by five years, to September 2035, and directed staff to pursue West Construction at about $1.24M for the expansion. The project converts a storefront at 240 Aragon Ave. into a 92-seat theater with a lobby and cafe. The city had earlier provided $450,000.
What it may mean for the marketThe expansion adds a cultural and cafe destination to the Miracle Mile and Aragon Avenue area downtown. The project is about 11 miles north of Mashta Island, elsewhere in Miami-Dade County.
Source: Miami Today - October 2026Development
Homestead lands aerospace tenants building on spaceport designation
AST SpaceMobile has expanded satellite manufacturing into Homestead, and Global Engine Stands signed a 10-year lease for 35,000 SF at the Park of Commerce. The park has about 500,000 SF of available industrial space and nearly 500,000 SF more recently approved. The mayor said other prospects have discussed bringing several hundred jobs.
What it may mean for the marketAerospace and aviation tenants add industrial employment options in South Dade and put more of the Park of Commerce's space into use. The project is about 13 miles southwest of Mashta Island, elsewhere in Miami-Dade County.
Source: Miami Today - October 2026Retail & Dining
Shops at Sunset Place nears demolition for mixed-use redevelopment
The plan calls for 1,513 residences in seven towers of 12 to 33 stories, a 287-room hotel, a 1,300-seat theater, 202,462 square feet of retail and 65,892 square feet of office. Demolition is now targeted for early 2027 and a first phase around 2029. Plans estimate about $149 million in infrastructure improvements.
What it may mean for the marketReplaces a largely vacant mall with housing, hotel and street-level retail near Dadeland and the South Dade Metrorail line. The project is about 8 miles north of Mashta Island, elsewhere in Miami-Dade County.
Source: Miami Today - September 2026Development
University of Miami agreement with Coral Gables would add a hospital of up to 100 beds
A development agreement would allow construction of a hospital with up to 100 beds on the university's Coral Gables campus, offering inpatient, outpatient and emergency care. The agreement would also reshape the campus, which includes the Gables Village residential complex of 1,458 beds slated for mid-2029. Cost, size and timeline for the hospital were not stated.
What it may mean for the marketA campus hospital would add inpatient and emergency care capacity and healthcare employment in the Coral Gables area. The site is about 9 miles north of Mashta Island.
Source: Miami Today - September 2026Civic
Miami-Dade commissioners adopt $14.26 billion budget with flat tax rate
County commissioners approved the fiscal year 2026-27 budget after a meeting that ran from Thursday afternoon into Friday morning. The operating property tax rate stays flat at 4.57 mills. The county says the plan prioritizes public safety, parks and transportation amid slowing revenue growth.
What it may mean for the marketA flat operating millage keeps the county's property tax rate steady for owners across Miami-Dade for the coming fiscal year. The site is about 14 miles north of Mashta Island.
Source: Local 10 News - June 2026Development
Grupo T&C plans 62-story 13th Edge tower near Brickell
Grupo T&C filed a pre-application with Miami-Dade County for 13th Edge, a 62-story, 648,700-square-foot tower at 237 Southwest 13th Street with 400 apartments and 400 hotel rooms. The project, designed by Kobi Karp Architecture, would replace the 36-unit El Vedado condominium built in 1972.
What it may mean for the marketIntroduces a large mixed-use residential and hotel tower to the area west of Brickell, adding hundreds of apartments and hotel rooms and replacing a small older condominium. The project is about 13 miles north of Mashta Island, elsewhere in Miami-Dade County.
Source: The Real Deal
Summaries reflect public reporting and official sources linked above as of the dates shown. Project details, timelines, and approvals can change. Commentary on potential market effects is general observation, not investment advice or a prediction for any specific property. For the freshest items across the whole region, see This Week in Northeast Florida.
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