TRANQUILITY BAY
Homes for Sale in Marathon, FL
True comps, carrying-cost math, and listings before the portals.
Tranquility Bay sits inside Monroe County's Florida Keys market, where land scarcity and coastal exposure set the floor on value independent of what any comparable mainland community would price at. The single data point buyers need to anchor their thinking is a median close price of $375,000 — a figure shaped heavily by lot position, water access, and construction type rather than by square footage alone.
At a median of 71 days on market against only three closings in the tracked window, this is a thin, deliberate market. Sellers are not in a hurry, and buyers who rush without local guidance regularly misjudge condition risk and flood-insurance carrying costs. Patience and due diligence are not optional here — they are the strategy.
The 60-Second Overview
TRANQUILITY BAY market snapshot (as of July 27, 2026): the median sale price is about $375K, and a median 71 days on market for closed sales.
Tranquility Bay is a small-scale community in Marathon, Monroe County, where the Florida Keys' constrained land supply and waterfront character define market dynamics more than any amenity package does — current MLS data identifies no structured community amenities, so value is driven by the individual site and the Keys location itself.
Who TRANQUILITY BAY is best for.
Best for
- A buyer targeting the Keys specifically for its coastal character and comfortable budgeting at or near the $375,000 median, with flexibility on closing timeline given the 71-day median DOM.
- A buyer who has already modeled Monroe County flood-insurance costs and understands that carrying costs here differ materially from inland Florida markets.
- A seller with a well-maintained, favorably positioned property who can wait out a deliberate buyer pool and does not need a rapid transaction.
Probably not for
- A buyer expecting a structured amenity community — pools, fitness centers, managed common areas — as no such amenities are documented in current MLS data.
- A buyer who requires multiple active listings to compare simultaneously; with only three closings in the window, inventory is extremely limited and choices are narrow.
- A buyer counting on a short due-diligence period or a steep discount from ask — the 71-day DOM reflects buyers who take their time, not sellers under pressure.
Price History: What Homes Here Have Actually Sold For
Median sale price over the trailing 12 months ending July 27 of each year, from record-level floridakeys closed sales. Same methodology as every appreciation figure on this page: the 2026 point ($375K) IS the median in the snapshot above.
Windows contain 2 to 16 sales each (3 in the current window); every figure carries its sample size, and thin markets swing on single closings. Listing data provided by Florida Keys MLS, Inc. Information is deemed reliable but is not guaranteed by the MLS to be accurate. Deemed reliable but not guaranteed.
The TRANQUILITY BAY buying strategy.
If we were buying in TRANQUILITY BAY 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 TRANQUILITY BAY.
Reading a thin market correctly
Three closings in the measurement window is not a soft market — it is a market with very few available properties. That distinction matters enormously to buyers: low transaction volume in the Keys typically reflects limited inventory rather than soft demand, and it means the next listing that comes to market may face little direct competition from comparable properties. For sellers, that scarcity supports pricing, but unrealistic asks still sit; the 71-day median DOM signals that buyers here are doing full homework before committing.
No community amenities are documented in current MLS data, which is common for smaller Keys enclaves where the surrounding environment — boating access, proximity to the water, the Monroe County coastal setting — functions as the amenity. Buyers expecting a managed amenity package should verify directly what, if anything, is maintained in common. What the data does confirm is that price spread in this kind of market is wide and condition-driven: two properties at the same address type can sit on opposite ends of the value range depending on dock configuration, elevation, and the age of mechanical systems.
The location and the amenities are priced into every listing in TRANQUILITY BAY. The deal is won or lost on condition, the comps, and the renovation math.
Why work with Momentum here
A community with three closings in its recent window and no documented amenity structure is exactly where broker-level market intelligence separates a good outcome from an expensive mistake. Momentum brings Northeast Florida transactional depth and a clear-eyed read on Keys-specific due-diligence requirements — flood zone classifications, insurance cost modeling, and the structural questions that matter on coastal properties. We will tell you when a listing is priced correctly and when it is not, and we will tell you when Tranquility Bay is simply not the right fit for what you are trying to accomplish.
TRANQUILITY BAY in 15 seconds.
HOA, CDD & Fees
- Mandatory HOA — confirm current dues
- 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 TRANQUILITY BAY 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 TRANQUILITY BAY sales matched to your home.
Price it to the comps and condition, not an automated estimate.
If you are thinking about selling in TRANQUILITY BAY, the right list price comes from recent comparable sales matched to your home's condition and location, not an automated estimate.
What is your TRANQUILITY BAY home worth?
Get a no-obligation home value based on real comparable sales in TRANQUILITY BAY, not an automated guess. Tell us about your home and we will personally prepare your numbers and a pricing strategy. No obligation, no spam.
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Frequently Asked Questions
What is the median home price in TRANQUILITY BAY?
How long do homes in TRANQUILITY BAY take to sell?
Do cash buyers compete in TRANQUILITY BAY?
Have TRANQUILITY BAY home prices gone up?
Who is the best real estate agent for TRANQUILITY BAY?
How do I find a top Marathon real estate agent who knows TRANQUILITY BAY?
Can Momentum Realty connect me with an agent for TRANQUILITY BAY?
Should you buy in TRANQUILITY BAY?
An honest fit check. We will tell you when it is not your community.
Data sources & freshness
| Community market stats | floridakeys closed sales, 12-month windows ending July 27, 2026 |
| Historical depth | Closed-sale records back to 2005 (136 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 floridakeys 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.
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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 floridakeys member average and 8 days faster, and we’ll price yours against live your area comps.
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