818 39Th Street Gulf, Marathon, FL 33050
Sources: Florida Keys MLS (listings + 12-mo closed sales), FEMA, modeled insurance. Interpretation: Momentum Research. Data notes
As of September 29, 2026, 818 39Th Street Gulf in Marathon Beach (49.0), Marathon is listed at $2,390,000. That is 54% above Marathon Beach (49.0)'s median closed sale of $1,550,000 over the last 12 months (31 recorded sales). It came to market within the past week. Listing facts: new construction, a private pool, HOA dues of $183/mo. The parcel maps to FEMA flood zone AE, a special flood hazard area where lenders generally require flood insurance. Figures are from the MLS record and county data; deemed reliable but not guaranteed.
- No CDD assessment on record
- New construction — built 2025
- Active listing
- HOA $183/mo (per listing)
Pricing & the Sugarloaf Shores (17.0) market
How this home is priced against recent nearby sales, and where Sugarloaf Shores (17.0) has been over 25 years. Momentum Research analysis of Florida Keys MLS records; closed sales, deemed reliable but not guaranteed. Estimates only; see data notes.
Median sale price by year
12-month median closed price, 2012–2026.
Market Heat by year (0–100)
Momentum Market Heat, 2013–2026. Now 42 (normal).
This home’s history
- 2025BuiltPer public record
- Sep 29, 2026First trackedObserved at $2,390,000
- NowActiveCurrently for sale
Build year is from public record. Listing milestones reflect movewithmomentum.com’s own observations since we began tracking this listing and are not the MLS listing history; dates and prices are deemed reliable but not guaranteed.
Estimated monthly payment
- Principal & interest $12,759/mo 81%
- Taxes $2,091/mo 13%
- Insurance $644/mo 4%
- HOA $183/mo 1%
$15,677/mo at 20% down, 30-yr @ 7.03% · edit any field to update.
Editable estimate — not a loan offer. Estimates only; see data & estimate notes.
Natural hazard risk
FEMA National Risk Index for Monroe County, FL: overall Relatively Moderate. Ratings compare this county with every county in the United States for expected annual loss from each hazard.
Source: FEMA National Risk Index (county level, hazard risk ratings only). Ratings describe the county, not this parcel; the flood zone shown above is parcel-specific. Verify insurance requirements with your lender and agent.
Momentum Property Score
42/100 is below average across the objective indicators below. It reflects only those measures — not the home’s quality, condition, or desirability.
A 0-100 score built from objective property and market data: flood risk, insurance, pricing, supply, affordability, and recent sales. Higher means more measures line up in a buyer’s favor. It reflects only the factors below.
Momentum Scores are objective, rules-based indicators computed from listing facts, public records, and recent nearby sales. They are not appraisals, valuations, investment advice, or judgments about a neighborhood or who should live there. Verify independently.
The Momentum read
Recent Sugarloaf Shores (17.0) sales closed near 92.3% of original asking.Why it matters: the community’s own record shows how far opening prices typically move, and how often buyers compete without financing.Momentum Research analysis of Florida Keys MLS records, community-level, 12 months ending September 20, 2026. Aggregates only; deemed reliable but not guaranteed.
What’s unique here: one of only 1167 active listings in Sugarloaf Shores (17.0), no CDD assessment.
Jump to: About this home · Every number, sourced · Monthly cost · Flood & risk · History · FAQ
Updated September 29, 2026 · MLS facts carry their source; interpretation lines are Momentum Research · Data sources & freshness
About this home
Welcome to Emerald Flats, a gated waterfront enclave in the heart of Marathon where refined coastal design meets the Florida Keys lifestyle. Built in 2025, this beautifully furnished 5-bedroom, 4-bath residence offers 2,565 square feet of thoughtfully designed living space, with high ceilings, an open-concept layout, impact-rated windows and doors, and a metal roof. Elevated on concrete pilings, the home is designed for both style and durability while creating generous covered space beneath the residence.
Inside, the light-filled living areas showcase a sophisticated coastal aesthetic with seamless flow between the kitchen, dining, and gathering spaces. The kitchen is a true centerpiece, featuring quartz countertops, KitchenAid stainless steel appliances, crisp white cabinetry, a striking waterfall-edge island, and generous seating and prep space. Expansive glass doors open to covered balconies, extending the living space outdoors, while a separate bar and entertainment area adds another polished touch for hosting family and friends.
Outdoor living is equally impressive, with a private heated pool, tropical landscaping, expansive paver areas, and multiple covered spaces ideal for relaxing or entertaining. Boaters will appreciate the included Boat Slip #30, reported to measure approximately 45 feet long by 14.75 feet wide, offering convenient private docking within the Emerald Flats Marina community. The slip is separately identified by Monroe County as a marina condominium boat-slip parcel.
Fully furnished and move-in ready, this home offers an exceptional combination of luxury, boating access, modern construction, and effortless island living in one of Marathon's desirable waterfront communities.
All 41 photos
Description provided by Coldwell Banker Schmitt Real Estate Co. and reproduced from the MLS; not independently verified.
Every fact, sourced
Listing data, public records, our calculations, and what to verify — each fact shown once. Estimates and calculations shown are for general information only, are not appraisals or advice, and should be independently verified.
Listing facts MLS
Public records & third-party data
Calculated estimates
Buyer should verify Buyer verify
Similar homes for sale near Marathon Beach (49.0)
Active listings nearby at a comparable size and price. Listings held by brokerages other than Momentum Realty are marked with the listing broker. Deemed reliable but not guaranteed.
Newest listings in Marathon Beach (49.0)
- 252 Oleander Drive · $450,000 · 2 bd / 2.0 ba · listed September 29, 2026 (courtesy of Engel & Völkers Islamorada)
- 143 Dorsett Drive · $4,950,000 · 4 bd / 3.0 ba · listed September 29, 2026 (courtesy of Engel & Völkers Marathon)
- 197 Golf Club Drive · $1,350,000 · 3 bd / 2.5 ba · listed September 29, 2026 (courtesy of Expert Realty LLC (HQ))
- 3200 Harriet Avenue · $665,000 · 2 bd / 1.5 ba · listed September 29, 2026 (courtesy of Keller Williams Realty Professionals (KW))
- 459 Pattison Drive · $2,299,995 · 3 bd / 2.0 ba · listed September 28, 2026 (courtesy of Coldwell Banker Schmitt Real Estate Co)
- 499 Sombrero Beach Road · $1,595,000 · 3 bd / 2.0 ba · listed September 27, 2026 (courtesy of Island Welcome Real Estate)
Recently off market in Marathon Beach (49.0)
- 601 W Ocean Drive #311D · last listed $545,000 · 2026-09-29
- 601 W Ocean Drive #203A · last listed $479,000 · 2026-09-29
- 500 Burton Drive #1415 · last listed $569,000 · 2026-09-29
- 417 95Th Street · last listed $424,900 · 2026-09-29
- 325 Calusa Street #96 · last listed $1,688,000 · 2026-09-29
- 3200 Harriet Avenue · last listed $665,000 · 2026-09-29
Price & listing history
Building permits
Flood zone & elevation
Sourced environmental data for the parcel. Confirm with FEMA and your insurer.
From the FEMA flood map. Lender-required flood insurance may apply; confirm for the parcel.
Approximate parcel elevation from USGS; confirm exact elevation with a survey.
This is a coastal Florida county. Premiums and coverage vary by home; obtain a quote from a licensed insurer.
Internet & broadband
AT&T Fiber covers much of NE Florida; confirm availability at the address.
Xfinity/Spectrum cable broadband is widely available.
T-Mobile / Verizon fixed-wireless as a backup option.
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Listed by Coldwell Banker Schmitt Real Estate Co. · MLS # 621439
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Recent sales activity in Marathon Beach (49.0)
Recent comparable closed sales near this home, from public records. Summary figures are for general reference only and are not a valuation of this property. See the Marathon Beach (49.0) neighborhood guide for more.
Recent nearby closings in the data set.
Canonical 12-month median closed price. Reference only.
Canonical 12-month median $/sq ft. Reference only.
Explore Monroe County
Browse market data, schools, taxes, and homes for sale across the county.
Assigned schools
Schools currently assigned to this address in Monroe County, provided as neutral factual data. Assignments can change — confirm current zoning with the school district. This is not a statement about the home's suitability for any person or family.
Comparable recent sales
Recent closed sales nearby, with photos, so you can compare. Sold prices are public record, deemed reliable but not guaranteed.
No closely comparable recent sales were found in this data set.
Just listed: new homes for sale in the Florida Keys in the last 48 hours · updated hourly · RSS · The Florida Keys market today: new listings, price cuts, pendings
Investment snapshot
Objective rental and cash-flow estimates for a buyer weighing this as an investment. Rough figures for general information only — not a guarantee of rent, an appraisal, or investment advice. Verify independently.
Buyer research checklist
Items worth confirming for 818 39Th Street Gulf, chosen from what the record shows. This is general guidance, not advice about this specific property.
- New construction: get the builder's warranty terms and the certificate of occupancy in writing, and ask which finishes shown are upgrades.
- HOA dues are listed at $183/mo: request the current budget, reserves, and rules before relying on that figure or on any restriction.
- FEMA flood zone AE: lenders generally require flood insurance here — get an elevation certificate and a flood quote before the inspection period ends.
- Get a homeowners insurance quote for this specific address in Monroe County; a wind-mitigation inspection and, on older homes, a four-point inspection can change the premium.
- Private pool: confirm the barrier or alarm meets the state residential pool safety code and ask for pump, heater, and resurfacing records.
- Confirm square footage and room dimensions independently.
- Order a survey to confirm lot boundaries and easements.
- Review permit history with the county.
- Property taxes: the estimate on this page (about $25,095/yr) assumes reassessment at the list price; the seller's homestead cap does not transfer, so their current bill is not a guide.
- Confirm school zoning directly with the district.
Approximate distances
Approximate drive times for general reference only.
Groceries, dining, and parks for this city — see the city guide.
View →Schools, taxes, and services are county-administered — see the county guide.
View →Amenities and HOA/CDD detail on the neighborhood guide.
Data sources & freshness
| Listing record | Florida Keys MLS, refreshed hourly (last: September 29, 2026) |
| Community market stats | Florida Keys MLS closed sales, as of September 20, 2026 |
| Flood zone & elevation | FEMA flood maps + USGS elevation (Zone AE shown above) |
| Taxes & monthly cost | Estimated from county rates; not a quote |
| Insurance figure | Modeled estimate; obtain a real quote before offering |
| Schools | 2025-26 district assignments; verify with the district |
Momentum Research lines are our own analysis of Florida Keys MLS records; MLS data is deemed reliable but not guaranteed. Estimates are informational, not appraisals or advice. Methodology: how Momentum scores are computed.
Frequently asked questions
How big is 818 39Th Street Gulf and when was it built?
Per the listing record, 818 39Th Street Gulf was built in 2025 and has 5 bedrooms and 4.0 bathrooms. Living area and lot size come from the MLS record and should be verified against the county property appraiser.
What community is 818 39Th Street Gulf in?
818 39Th Street Gulf is in Marathon Beach (49.0) in Marathon, Monroe County. The community section on this page shows recent closed sales, days on market, and active inventory for Marathon Beach (49.0) from the same MLS data.
Does 818 39Th Street Gulf have an HOA, and how much are the dues?
The listing reports HOA dues of $183 per month. Dues, what they cover, and the community's rules should be confirmed from the association's current documents before relying on them.
Why might property taxes on 818 39Th Street Gulf differ from the current owner's?
The estimate on this page (about $25,095 per year) assumes reassessment at the list price. Florida's Save Our Homes rule caps annual assessment increases for homesteaded owners, and the assessment resets after a sale, so a new owner's bill may differ from the seller's. Any tax figure shown here is an estimate, not the actual bill — confirm with the county property appraiser and tax collector.
Is 818 39Th Street Gulf in a flood zone?
The FEMA flood map places this parcel in Zone AE, a special flood hazard area where lenders generally require flood insurance on a mortgaged purchase. Confirm the parcel's status with FEMA and your insurer, and ask for an elevation certificate.
Can I rely on the figures on this page?
No. Estimated taxes, insurance, payments, and any market or comparable-sales summary are opinions and estimates for general information only and should not be relied upon. Verify all information independently before making any decision.
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Opinion & estimate — do not rely on this page. Any figure on this page that is not a verbatim fact from the listing or a public record — including estimated property taxes, insurance, CDD/HOA amounts, mortgage payments, comparable-sales summaries, and market statistics — is an opinion and estimate provided for general informational purposes only. These figures may be inaccurate or out of date, are not appraisals, valuations, or financial, legal, tax, or investment advice, and should not be relied upon. Do not make any purchase, offer, financing, or other decision based on this page. Independently verify everything — price, square footage, lot size, year built, taxes, CDD/HOA, flood status, school assignments, permits, and community rules — with the listing broker, the county, your lender, a licensed inspector, an insurer, and your own advisors before acting.
Estimate methodology. Tax estimates apply a typical county millage rate to the list price and will differ from the actual assessed bill. Cost and market figures are derived from available data and simple calculations, not a professional appraisal. We make no representation that any estimate reflects fair market value.
Equal Housing Opportunity. Content on this page is compiled from public records, MLS data, and automated sources and may contain errors or be out of date. It is general information only, not a representation about any specific property, community, builder, or association. Verify information independently before relying on it. Momentum Realty supports the Fair Housing Act and does not discriminate on the basis of race, color, religion, sex, handicap, familial status, national origin, sexual orientation, or gender identity. Information about schools, distances, and amenities is provided as neutral factual data to help you research the property and is not a statement about who should or should not live here or the suitability of the home or neighborhood for any person or group. School data may change — confirm current assignments with the school district.
Found an error? If you are the owner, listing agent, or a party to this property and believe any information is inaccurate, email and we will review and correct or remove it promptly.
Automated content. Some summaries, distances, and estimates on this page are generated automatically from public and proprietary data sources and may contain errors or omissions. We strive for accuracy but cannot guarantee the completeness or accuracy of any information. Verify anything important independently.
No warranty; measurements & photos. No guarantee, warranty, or representation of any kind is made regarding the completeness or accuracy of any information, descriptions, or measurements on this page — including square-footage measurements and property condition — all of which should be independently verified through appropriate means, including in-person inspection and public records. Photographs may be virtually staged or digitally enhanced and may not reflect actual property conditions. Momentum Realty and its agents expressly disclaim any liability in connection with the information provided.
MLS / IDX. The data relating to real estate for sale on this web site comes in part from the Internet Data Exchange (IDX) program of the Florida Keys MLS, Inc. Internet Data Exchange. Real estate listings held by brokerage firms other than Momentum Realty are marked with the listing broker's name and include the name of the listing agent. Data provided is deemed reliable but is not guaranteed by the MLS to be accurate. The information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Source: Florida Keys MLS, Inc.. © 2026 Florida Keys MLS, Inc. All rights reserved.
Listing data is deemed reliable but is not guaranteed and is subject to change or withdrawal without notice. Square footage and lot size are approximate. Real estate brokerage services provided by Momentum Realty, licensed in Florida and Georgia. © 2026 Move With Momentum LLC.