Home in 544 Warren Lane, Key Biscayne, FL 33149 for sale with MLS# A12079811

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.

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544 Warren Lane, Key Biscayne, FL 33149

Price
Price:
$8,000,000.00
Original List Price:
$8,000,000.00
List Price per Sq Ft (Calculated, Approx.):
$7,662.83
Property Status and Type
Listing Type:
For Sale
Status:
Active
Listing Category:
Residential
Property Type:
Single Family House
Description of Last Important Update:
New Listing
Last Major Update on:
August 29, 2026 4:00 am
Other Special Conditions:
Flood Zone
Rooms Distribution
Bedrooms:
6
Bathrooms Total:
6
Full Bath:
5
Half Bath:
1
Room Type:
Other
Master Bedroom Bath:
Master Bdrm - Ground
Measures
Living Area:
1,044 Sqft
Built-Up Area:
2,229 Sqft
Lot Size Acres:
0.18
Property Features
View from the Property:
Pool, Garden
Waterfront:
No
Private Pool
Swimming Pool Features:
In Ground
Spa
Furnished:
Furnished
Appliances:
Gas Range, Ice Maker
Interior:
Walk-In Closet(s), Vaulted Ceiling(s)
Exterior:
Built-in Barbecue
Patio and Porch:
Porch, Porch - Open
Fireplace
Air Conditioning
Air Conditioning System:
Central Air, Electric
Heating
Heating System:
Electric
Property Entrance Faces:
Southeast
Storm Protection Impact Glass:
Partial
Sprinkler Description:
Auto Sprinkler
Construction
Year Built:
2026
Roof:
Concrete
Levels:
Two
Entry Level (floor):
1
Construction Materials:
Block
Flooring:
Wood, Marble
Number of stories:
2
Flood Zone Code:
AE
Property Condition:
New Construction
Taxes and Expenses
Tax Annual Amount:
$29,546.00
Tax Year:
2025
Property Tax Details:
New Construction
Parking
Garage Spaces:
0
Carport Spaces:
2
Covered Spaces:
2
Parking Features:
Driveway, On Street, Attached Carport, Carport
Carport
Utilities
Sewer:
Public Sewer
Utilities Available:
Cable Available
Water Source:
Public
Community
Amenities Provided by the Homeowner's Association (HOA):
Other
Subdivision Name:
TROPICAL ISLE HOMES SUB
Senior Community:
Yes
Restrictions:
No Restrictions
Terms
Listing Terms Considered by Seller:
Cash, Conventional, Owner Will Carry Points
Buyer Possession:
Close Of Escrow
Zoning and Legal
Tax Legal Description:
5 55 42 TROPICAL ISLE HOMES SUB PB 50-64 LOT 1 BLK 3 LOT SIZE 77.500 X 101 73R-81592
Real Estate Folio Number (Parcel Number):
2452050020160
Zoning:
0100
Public Schools Assigned
Elementary School:
Key Biscayne K-8
High School:
Coral Gables
Middle Or Junior School:
Ponce De Leon
Listing History
Active on the market since:
August 29, 2026
Listing Agreement executed on:
August 29, 2026
Listing Status Last Changed On:
August 29, 2026 4:00 am
Photos updated on:
September 2, 2026 6:02 pm
Last Modified:
September 2, 2026 6:03 pm
Additional Information
Courtesy of:
Duncan Studio Real Estate Division PLLC
Attribution:
Not provided
Location
Street Name:
Warren
Street Number:
544
City:
Key Biscayne
State:
Florida
Zip Code:
33149
County:
Miami-Dade
Latitude:
N25° 41' 29.2''
Longitude:
W81° 49' 50.7''
Street Suffix:
Lane
Property Map

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Neighborhood Stats

Source: U.S. Census Bureau, ACS 5-Year Estimates

Median Household Income $171,982
Median Home Value $1,231,500
Median Rent $3,501/mo
Median Age 43
Population 14,628

Air Quality

Source: AirNow.gov · Miami

🌬️ Air Quality Index (AQI) 35 Good
☀️ O3 35 Good
🫁 PM2.5 35 Good
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Association of REALTORS®
Disclaimer: IDX listing information is presented by Rebonus Brokerage LLC for consumer informational purposes only. The information 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. Data is deemed reliable but is not guaranteed by the MLS or the real estate broker. This page presents structured listing information sourced directly from the MLS via the RESO Web API feed. Rebonus prioritizes maximum field coverage and data completeness, displaying the most granular MLS-provided attributes available.