SEA CREST
Homes for Sale in Marathon, FL
True comps, carrying-cost math, and listings before the portals.
Sea Crest sits in Marathon, Monroe County — the Florida Keys, where land scarcity and coastal exposure together set the floor on what housing costs. The community's median price of $520,000 reflects that reality, not square footage. At a median of 1,519 square feet, these are modest homes by any mainland standard, and the spread from 1953 to 2022 in construction vintage means condition, elevation certificate status, and insurance cost vary considerably from parcel to parcel. Price here is driven less by size and far more by lot position, flood zone, and how recently a structure was built or brought up to current wind-mitigation standards.
The market posture right now favors patience over urgency. A median of 182 days on market is not noise — it signals that buyers in Sea Crest have time to negotiate and that overpriced or under-improved listings are sitting. Only three closings in the tracking window reinforce that this is a thin, slow-moving market. Sellers who price to condition and insurance reality are moving; those chasing peak comps are not. Buyers should treat that DOM figure as leverage, not as a warning to hesitate.
The 60-Second Overview
SEA CREST market snapshot (as of July 27, 2026): the median sale price is about $520K, and a median 182 days on market for closed sales.
SEA CREST is a community of 19 homes in Marathon, Monroe County, built between 1953 and 2022 (median 1958), with a median living area of about 1,519 square feet. 35% of parcels are homesteaded, the owner-occupancy proxy in the Florida DOR assessment roll (2025 roll, public records).
Sea Crest is a small, vintage Marathon community — 19 homes, a build history stretching back to 1953, and a median year built of 1958 — where the Keys context does as much to set value as anything inside the property lines. With no identified community amenities, the draw is the location itself: Monroe County waterfront proximity, the Keys lifestyle, and the finite supply of buildable land that underpins the $520,000 median.
Who SEA CREST is best for.
Best for
- Buyers targeting a Keys vacation or second property at a median around $520,000 who understand that operating costs — insurance, flood coverage, maintenance — require a realistic budget beyond the purchase price.
- Patient buyers willing to wait out a slow market, use 182-day DOM as negotiating leverage, and conduct thorough due diligence on flood zone, elevation, and wind mitigation before committing.
- Buyers open to older construction who have the appetite for renovation or updating and want access to the Monroe County coastal environment without a larger-scale community's price premium.
Probably not for
- Buyers who need a liquid, high-turnover market — three closings in the recent window and a median of 182 days on market mean exit timing is uncertain.
- Buyers whose budget does not leave room for insurance costs, elevation certificate work, or structural upgrades that aging Keys homes routinely require.
- Buyers expecting a full-amenity, managed community environment — Sea Crest has no identified community amenities, and the value proposition is location, not infrastructure.
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 ($520K) IS the median in the snapshot above.
Windows contain 0 to 4 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 real cost & risk here
Before the list price, the Florida math the portals skip. These are Monroe County typicals — your exact home, flood zone, and insurance quote will vary, so verify each before you offer.
Check it for your address: look up your flood zone (FEMA) · insurance by county · true-cost calculator · Monroe County scorecard.
County typicals from Momentum’s Florida housing data (Zillow & Realtor.com aggregates, Census, FRED), updated monthly; insurance modeled. Flood zone is property-specific — always confirm via FEMA.
The SEA CREST buying strategy.
If we were buying in SEA CREST 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 SEA CREST.
Vintage stock, Keys premium
Roughly two-thirds of Sea Crest's 19 homes carry no homestead exemption, meaning the majority of the inventory is held as investment, vacation, or rental property rather than as a primary residence. That is a meaningful signal for a prospective buyer: the competition you may face is often from cash-oriented or investment-minded purchasers, not owner-occupants stretched to their limit. It also means that when the market softens, as the current DOM suggests it has, motivated non-resident sellers can emerge.
The age profile of the housing stock — median year built of 1958, with the oldest homes dating to 1953 — means due diligence here is not optional. Wind mitigation ratings, flood zone designations, elevation certificates, and the state of roofs, electrical panels, and plumbing are each capable of swinging your actual cost of ownership well beyond the purchase price. A buyer who skips a thorough inspection and an independent insurance quote before making an offer is not prepared for this market. The newer end of the build range, reaching to 2022, shows the community does turn over to modern construction, but at 19 homes total, every individual property has to be evaluated on its own terms.
The location and the amenities are priced into every listing in SEA CREST. The deal is won or lost on condition, the comps, and the renovation math.
Why work with Momentum here
Sea Crest is not a market where you can rely on volume-based pattern recognition — there are 19 homes and three closings in the recent window. A brokerage that works the Florida Keys understands how to read thin data, pull the right comparable sales across Marathon, and assess the insurance and flood-zone variables that actually determine what a property costs to own. Momentum brings that specificity. We will tell you when the asking price reflects a realistic insurance scenario and when it does not, and we will not push you toward a closing that the numbers do not support.
SEA CREST 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 SEA CREST 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 SEA CREST sales matched to your home.
Price it to the comps and condition, not an automated estimate.
If you are thinking about selling in SEA CREST, the right list price comes from recent comparable sales matched to your home's condition and location, not an automated estimate.
What is your SEA CREST home worth?
Get a no-obligation home value based on real comparable sales in SEA CREST, 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 homes for sale in SEA CREST on the map →
Frequently Asked Questions
What is the median home price in SEA CREST?
How long do homes in SEA CREST take to sell?
How many homes are in SEA CREST?
What share of SEA CREST is owner-occupied?
When were the homes in SEA CREST built?
Do cash buyers compete in SEA CREST?
Who is the best real estate agent for SEA CREST?
How do I find a top Marathon real estate agent who knows SEA CREST?
Can Momentum Realty connect me with an agent for SEA CREST?
Should you buy in SEA CREST?
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 |
| Housing stock & ownership | Florida DOR 2025 assessment roll (street-list match (2 streets, ZIP 33050)) |
| Historical depth | Closed-sale records back to 2008 (39 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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More Marathon & The Florida Keys & Monroe County guides
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