Mashta Island
Homes for Sale in Key Biscayne, FL
All 86 homes for sale in Key Biscayne, FL · median $1,299,000 · 138 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 September 2026, Mashta Island in Key Biscayne, FL has 2 homes for sale. As of September 2026, the MLS records 21 closed sales in Mashta Island in Key Biscayne, FL since 2012, the most recent in August 2026.
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.
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, 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 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 2026-09-18, 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 2012 through 2026. Tap any home to ask about it.
Every Home for Sale in Mashta Island Right Now (2)
All 2 active and pending Mashta Island listings with a detail page, newest first, refreshed twice a day from the MLS.
- 640 S Mashta Dr · $16,800,000 · 4 bd / 4 ba · listed Sep 7, 2026 · listed by DLS International Realty
- 631 N Mashta Drive · $18,500,000 · 4 bd / 5 ba · listed Jul 31, 2026 · listed by Coldwell Banker
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.
HOA, CDD & Fees
- HOA status not on record. Verify any dues before you offer
- Any club/amenity membership is billed separately
Confirm the current HOA dues, exactly what they cover, and any CDD bond or special assessment for a specific address before you offer.
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: September 18, 2026) |
| Under-contract shares | MIAMI MLS records, as of 2026-09-20 |
| Historical depth | Closed-sale records back to 2012 (21 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.
Own a home here?
You just read the data. Now see what your home is worth.
The numbers on this page move markets in the aggregate. The number that matters to you is what a buyer pays for your address. Momentum sells for 1.25% above the MIAMI MLS member average and 8 days faster, and we’ll price yours against live local comps.
Looking to buy here? Search homes for sale →
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A real valuation with real comps from a local listing agent, not an instant algorithm. Response within one business day.
See how MASHTA ISLAND fits the bigger picture — live prices, inventory, and Momentum Scores:
Common questions about Mashta Island
Where is Mashta Island?
Mashta Island is a community in Key Biscayne, Miami-Dade County, Florida, ZIP 33149.
Are there homes for sale in Mashta Island right now?
Yes — 2 active and 0 pending listings as of the last feed refresh (twice daily). They are listed on this page.
Does Mashta Island have an HOA or CDD?
No HOA is on record for Mashta Island in our data. Verify dues, what they cover, and any special assessment for a specific address before you offer.
Answers are generated from county property records, MLS feeds and the figures on this page, as of the page date; deemed reliable but not guaranteed.
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