Mashta Island A
Homes for Sale in Key Biscayne, FL
All 83 homes for sale in Key Biscayne, FL · median $1,265,000 · 133 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 A Replat of in Key Biscayne, FL has 2 homes for sale. As of September 2026, the MLS records 16 closed sales in Mashta Island A Replat of in Key Biscayne, FL since 2019, the most recent in August 2026.
Last 30 days in Mashta Island A: 2 new listings (median asking $13,125,000). As of September 18, 2026, Listing information provided by the Southeast Florida MLS (SEFMLS) / MIAMI Association of REALTORS(R). Information is deemed reliable but not guaranteed by the MLS to be accurate.
Mashta Island A Replat Of shows zero recorded closings in the current window, and current MLS listings do not surface any confirmed community amenities. That combination means there is no reliable price signal to point to right now — no median, no volume, nothing to benchmark against recent activity.
For a buyer or seller, that is not a red flag so much as a data gap. It means pricing here has to be built from direct comparable research and agent outreach rather than pulled from a dashboard. Anyone quoting you a number for this specific replat plat right now is either working from off-MLS knowledge or guessing.
The 60-Second Overview
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.
Who Mashta Island A is best for.
Best for
- Buyers with a specific reason to target this exact plat, willing to verify details directly rather than lean on listing data
- Sellers open to a pricing process built from broader area comparables rather than same-plat closings
- Buyers comfortable moving forward without confirmed community amenity listings
Probably not for
- Buyers who want a clear median price and recent sales trend before making an offer
- Anyone relying solely on MLS-listed amenities to shape their decision
- Buyers who need a fast, data-backed comparison against several recent closings
The market around Mashta Island A
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.
Homes For Sale Right Now in Mashta Island A
Live MLS inventory for Mashta Island A. 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 A 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 2019 through 2026. Tap any home to ask about it.
Every Home for Sale in Mashta Island A Replat Of Right Now (2)
All 2 active and pending Mashta Island A Replat Of listings with a detail page, newest first, refreshed twice a day from the MLS.
- 571 S Mashta Dr · $6,350,000 · 4 bd / 3 ba · listed Sep 4, 2026 · listed by HR 19 Realty LLC
- 520 S Mashta Dr · $19,900,000 · 5 bd / 4 ba · listed Aug 27, 2026 · listed by Coldwell Banker Realty
The Mashta Island A buying strategy.
If we were buying in Mashta Island A 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.
When the data goes quiet
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.
The location and the amenities are priced into every listing in Mashta Island A. The deal is won or lost on condition, the comps, and the renovation math.
Why work with Momentum here
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.
Mashta Island A 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 A 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 A 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 A, 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 A home worth?
Get a no-obligation home value based on real comparable sales in Mashta Island A, 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 A?
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 2019 (16 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.
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See how MASHTA ISLAND A REPLAT OF fits the bigger picture — live prices, inventory, and Momentum Scores:
Common questions about Mashta Island A
Where is Mashta Island A?
Mashta Island A is a community in Key Biscayne, Miami-Dade County, Florida, ZIP 33149.
Are there homes for sale in Mashta Island A 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 A have an HOA or CDD?
No HOA is on record for Mashta Island A 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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