MATHESON ESTATES
5 Harbor Pt, Key Biscayne FL 33149
3 beds · 4.5 baths · 10,926 ft²
$26,000,000
Est. Payment $138,383/mo
3
Bedrooms
4.5
Bathrooms
10,926
Sq. Ft.
1954
Year Built
111
Days on Market
Description
A once-in-a-generation opportunity on Key Biscayne’s only private waterfront road, this extraordinary estate spans 28,800 square feet with 120 feet of pristine water frontage, a secluded sandy beach, and a private dock framing panoramic views of the Miami skyline. Offering 10,926 square feet of living space, the property delivers exceptional privacy alongside a striking contemporary design recognized as part of the esteemed Rosa de la Cruz Collection. Soaring 20-foot ceilings, sculptural architectural lines, and expansive, light-filled interiors create a dramatic backdrop for art, entertaining, or a visionary reimagining tailored to your lifestyle. A truly rare canvas in an irreplaceable location, with architectural plans available to transform it into the most exceptional residence in Key Biscayne.
Facts
- MLS#
- A11921513
- Subdivision
- MATHESON ESTATES
- Property Type
- Residential
- Property Sub Type
- Single Family Residence
- Year Built
- 1954
- Lot Size
- 28,800 ft²
- Sq. Ft.
- 10,926 ft²
- Sq. Mt.
- 1,015 m²
- Price per sq. ft.
- $2,380/ft²
- Price per sq. mt.
- $25,616/m²
- Stories
- —
- Garage
- —
- Pool
- —
- Days on Market
- 111 days
- Listed
- Nov 26, 2025
- Last Updated
- Jul 6, 2026
- Price/Lot Sq.Ft.
- $903/ft²
Comparable homes
Same ZIP, similar price + bedrooms.
Market insights for Key Biscayne
Live MLS-derived activity. Forecast is a conservative rule-of-thumb estimate — not a guarantee.
Sellers market
October 2026
59
Median days to sold
+4.5%
1-year price forecast (est.)
Price & tax history
From the live MIAMI MLS feed. Older history requires the ListingHistory resource (not yet enabled).
| 7/6/2026 | Sold | $26,000,000 |
| 11/26/2025 | Listed for sale | $26,000,000 |
History reflects fields present on the live MLS record. Full multi-year history requires the MIAMI ListingHistory resource (not yet enabled).
Location
Estimated Monthly Payment
$160,200/mo
Principal & Interest
$138,383
Property Tax
$21,667
Insurance
$150
HOA
$0
Estimates only. Actual payment depends on credit, lender, insurance carrier, and FL/Miami-Dade specifics. Contact Rangely for a precise quote.
The data relating to real estate for sale on this website comes in part from the Southeast Florida Multiple Listing Service. MLS Data is deemed reliable, but is not guaranteed accurate by MIAMI REALTORS®.
Accuracy of listing information is not guaranteed. Listing information is provided for personal consumer, non-commercial use, solely to identify potential properties for potential purchase. All other use is strictly prohibited and may be a violation of federal and state law.
Copyright Southeast Florida MLS a/k/a SEFMLS © 2026.
Updated within 24 hours
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