87429 Old Highway, Plantation Key, FL 33036
Sources: Florida Keys MLS (listings + 12-mo closed sales), FEMA, modeled insurance. Interpretation: Momentum Research. Data notes
87429 Old Highway in Plant Beach (87.5), Plantation Key is listed at $18,499,000. That is 1093% above Plant Beach (87.5)'s median closed sale of $1,550,000 over the last 12 months (31 recorded sales). It has been listed Jul 2, 2025, longer than the community's typical 96 days to contract. Listing facts: new construction, a private pool, waterfront, no HOA. 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 2022
- Garage
- listed Jul 2, 2025
- No HOA reported by the listing (confirm)
About this home
The Oasis Islamorada is a waterfront estate of exceptional scale, conceived as a private Florida Keys compound where architecture, land and water come together spanning nearly 3 meticulously landscaped acres. More than 400' of shoreline, sweeping ocean views and a protected deepwater basin create a marine setting rarely available within a single residential offering. Beyond the grand porte-cochère, the single-level main residence unfolds with soaring ceilings, white oak floors and 12-foot retractable glass walls that dissolve the boundary between interior and oceanfront living.
At its center, a chef's kitchen pairs a cascading Calacatta marble island with Thermador appliances and a walk-in pantry, opening seamlessly to expansive living and dining spaces. The main residence includes four bedrooms and six full baths, with an impressive primary suite featuring a fireplace, dual walk-in closets, safe room and spa bath with steam shower. Additional suites offer en suite baths, private balconies and ocean views.
A detached two-bedroom, two-bath guest residence brings the estate to six bedrooms while preserving privacy between owners and guests, with substantial grounds offering extraordinary flexibility for the future. Outside, the property assumes the scale of a private resort. Two resort-style pools with spas and sun decks are joined by a summer kitchen, alfresco dining and multiple waterfront terraces.
A fitness center with sauna, soundproof theater and golf simulator complete the lifestyle offering. For the yachtsman, the protected deepwater basin accommodates substantial vessels with convenient direct Atlantic access. Built with an uncompromising focus on quality, security and enduring construction, The Oasis is more than an oceanfront residence.
It is a legacy-scale Florida Keys estate offering the increasingly rare combination of acreage, significant shoreline, protected deepwater dockage, multiple residences and complete privacy within one extraordinary property.
All 107 photos
Description provided by Ocean Sotheby's International Realty 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
Estimated monthly payment
- Principal & interest $102,467/mo 83%
- Taxes $16,187/mo 13%
- Insurance $5,374/mo 4%
$124,027/mo at 20% down, 30-yr @ 7.4% · edit any field to update.
Editable estimate — not a loan offer. Estimates only; see data & estimate notes.
What it really costs to own 87429 Old Highway
The parts of the monthly number a mortgage calculator leaves out, from this listing's MLS record, the county tax roll, Citizens and FEMA. Property facts only.
| HOA dues | The listing states there is no HOA. |
|---|---|
| Home and flood insurance | The average Citizens Property Insurance premium in Monroe County is $4,380/yr (1,542 policies, Citizens detail by county, April 2026); private-market quotes differ by roof age, wind mitigation and distance to the coast. The page's modeled range for this home is $45,000–$93,500/yr; neither is a quote. Flood: this address maps to FEMA zone AE, a high-risk zone where flood insurance is required with a federally backed mortgage. Statewide, a zone A/AE/VE flood policy runs about $1,200–$2,500/yr (FEMA Risk Rating 2.0 averages, not a quote). |
| Roof and age | Built in 2022. A newer roof and current wind-mitigation features usually mean the lower end of insurance quotes; ask for the wind-mitigation form. |
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.
Monroe County is on the Florida coast; wind coverage is a major part of the premium. Premiums and coverage vary by home (roof age, wind mitigation, claims history); obtain a quote from a licensed insurer.
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.
Internet & broadband
Address-level fiber service is not confirmed for this home. Check the FCC National Broadband Map (broadbandmap.fcc.gov) or the provider for this address.
Cable broadband is common in Florida and Georgia towns but not confirmed for this address; verify with the provider.
5G home internet and satellite service depend on the exact location; check coverage for this address.
Pricing & the Monroe County market
How this home is priced against recent nearby sales, and where Monroe County 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
- 2022BuiltPer public record
- About Jul 2025Listed (per MLS)Approximate list date from the MLS cumulative days-on-market count (<span class="mw-dom" data-listed="2025-07-02" data-fmt="dom">listed Jul 2, 2025</span>)
- Aug 4, 2026First seen on movewithmomentum.comObserved at $18,999,000
- Oct 16, 2026Price cut$18,499,000 (-$500,000, -2.6%)
- NowActiveCurrently for sale
Build year is from public record. The MLS list date is approximate (today minus the cumulative days on market the MLS reports, which can span relistings). Other 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.
Price & listing history
Building permits
Comparable recent sales
No closed sales of a similar home within about 10 miles in Monroe County in the last 18 months are in our MLS data set, so this page shows no comparable-sales median or automated estimate for Plant Beach (87.5). A licensed Momentum Realty agent can prepare a property-specific comparative market analysis on request.
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.
Coverage: 6 of 8 indicators had valid data for this home; indicators without data are left out, not scored as zero. Momentum Scores are objective, rules-based indicators computed from listing facts, public records, and recent comparable sales. They do not measure property condition, quality, or investment suitability, and they are not appraisals, valuations, investment advice, or judgments about a neighborhood or who should live there. Verify independently.
The Momentum read
🟢 Buyer-leaning conditions around this listing. 2077.7 months of supply in the surrounding market and 477 days on market for this home, against a 96-day area median.Days on market:this home 477Area median: 96 daysWhy it matters: above-median time on market, together with the level of supply, is a clear sign of how much leverage sits with buyers.Momentum Research interpretation of the MLS facts in the snapshot above. Listing data provided by Florida Keys MLS, Inc. Information is deemed reliable but is not guaranteed by the MLS to be accurate. As of September 20, 2026.
Recent Monroe County 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 Monroe County, no CDD assessment.
Jump to: About this home · Every number, sourced · Monthly cost · Flood & risk · History · FAQ
Updated October 22, 2026 · MLS facts carry their source; interpretation lines are Momentum Research · Data sources & freshness
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Listed by Ocean Sotheby's International Realty · MLS # 615643
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Similar homes for sale near Plant Beach (87.5)
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.
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Every home on Old Highway: what is for sale, what sold and when, the homes and the communities along it.
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
More on Monroe County
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.
City, county & community guides
Where this home sits, with links to the matching guides. 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.
Buyer research checklist
Items worth confirming for 87429 Old Highway, 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.
- The listing reports no HOA: confirm with the county record that no deed restrictions or mandatory association apply to this parcel.
- 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.
- Waterfront: confirm seawall or dock condition and permits, and ask who owns and maintains the shoreline.
- 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 $194,240/yr) assumes reassessment at the list price; the seller's current bill is not a guide Exemptions and portability change the actual bill — confirm with the county property appraiser.
- Confirm school zoning directly with the district.
Data sources & freshness
| Listing record | Florida Keys MLS, checked against the MLS hourly (last: October 22, 2026) |
| Comparable sales | Fewer than 3 defensible closed sales within about 10 miles in Monroe County — no medians or automated estimate shown |
| Flood zone & elevation | FEMA flood maps + USGS elevation (Zone AE shown above) |
| Taxes & monthly cost | Typical county effective rate applied to the list price; an estimate, not a bill |
| 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 87429 Old Highway and when was it built?
Per the listing record, 87429 Old Highway was built in 2022 and has 6 bedrooms and 8.0 bathrooms. Living area and lot size come from the MLS record and should be verified against the county property appraiser.
What community is 87429 Old Highway in?
87429 Old Highway is in Plant Beach (87.5) in Plantation Key, Monroe County. Too few comparable closed sales exist nearby for this page to show local sales statistics; a licensed agent can prepare a comparative market analysis.
Does 87429 Old Highway have an HOA?
The listing reports no HOA. Confirm with the county record that no deed restrictions or mandatory association apply to the parcel.
Why might property taxes on 87429 Old Highway differ from the current owner's?
The estimate on this page (about $194,240 per year) assumes reassessment at the list price less the homestead exemption. Florida reassesses a home after it sells; for a homesteaded seller the Save Our Homes cap on their assessment does not transfer, and a buyer's own exemptions and portability are applied separately, so the two bills usually differ. Any tax figure shown here is an estimate, not the actual bill — confirm with the county property appraiser and tax collector.
Is 87429 Old Highway 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 county millage to the list price (less the homestead exemption where the parcel is matched to the certified roll) 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.