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MLS #A12079811 image #0
New construction, this extraordinary custom Cape Dutch residence is a masterwork of timeless design, brought to life by Duncan and Heuser Design and Development, with interiors curated by James Duncan. Every detail, from the graceful gabled facade to the refined finishes within, reflects a rare devotion to craftsmanship and enduring elegance. Offering six generously proportioned bedrooms and six and a half beautifully appointed bathrooms, this home balances gracious scale with warm, livable comfort. Soaring ceilings, thoughtfully placed windows, and an effortless flow between rooms create a sense of light and openness throughout, while curated materials and bespoke millwork lend a distinctly luxurious character to every space. This is more than a house; it is a legacy residence, designed to be lived in beautifully for generations. A truly rare offering for the discerning buyer seeking timeless architecture, exceptional interiors, and uncompromising quality throughout.
Current real estate data for Single Family in Key Biscayne as of Oct 31, 2026
41
Single Family Listed
146
Avg DOM
2,613
Avg $ / SqFt
$14,295,512
Avg List Price
Listing Provided Courtesy of Duncan Studio Real Estate Division PLLC at 305-979-2520

Property Details

Price:
$8,000,000
MLS #:
A12079811
Status:
Active
Beds:
6
Baths:
5.5
Type:
Single Family
Subtype:
Single Family Residence
Subdivision:
TROPICAL ISLE HOMES SUB
Neighborhood:
2520
Listed Date:
Aug 29, 2026
Finished Sq Ft:
1,044
Total Sq Ft:
2,229
Lot Size:
340,987,680 sqft / 0.18 acres (approx)
Year Built:
2026
PoolNewconstructionCommunity 55 PlusTropical Isle Homes SubKey Biscayne K-8Ponce De LeonCoral Gables

Schools

Elementary School:
Key Biscayne K-8
Middle School:
Ponce De Leon
High School:
Coral Gables

Interior

Appliances
Gas Range, Ice Maker
Bathrooms
5 Full Bathrooms, 1 Half Bathroom
Cooling
Central Air, Electric
Flooring
Marble, Wood
Heating
Electric
Interior Features
Vaulted Ceiling(s), Walk-In Closet(s)
Levels
Two

Exterior

Association Amenities
Other
Community
55+
Construction Materials
Block
Covered Spaces
2
Direction Faces
Southeast
Exterior Features
Built-in Barbecue
New Construction YN
1
Parking Features
Attached Carport, Carport, Driveway, On Street
Patio And Porch Features
Porch – Open, Porch
Roof
Concrete
Senior Community YN
1
View
Garden, Pool

Financial

Tax Year
2025
Taxes
$29,546

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Property Summary

    Located in the TROPICAL ISLE HOMES SUB subdivision, 544 Warren Lane Key Biscayne FL is a Single Family for sale in Key Biscayne, FL, 33149. It is listed for $8,000,000 and features 6 beds, 6 baths, and has approximately 1,044 square feet of living space, and was originally constructed in 2026. The current price per square foot is $7,663. The average price per square foot for Single Family listings in Key Biscayne is $2,613. The average listing price for Single Family in Key Biscayne is $14,295,512. To schedule a showing of MLS#a12079811 at 544 Warren Lane in Key Biscayne, FL, contact your Trust House Realty agent at 9543362003.

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