
$8,000,000
Single Family ResidenceActive544 Warren Ln, Key Biscayne FL 33149
MLS #A12079811About This Property
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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About Key Biscayne
Key Biscayne is a barrier island community just a bridge ride from Brickell, offering an island lifestyle wrapped around Crandon Park, Cape Florida State Park, and the Crandon Golf Course. The village is known for its safety, top-rated schools, and walkable pace, with residents ranging from young families to international buyers seeking secondary residences. Limited inventory and tight geography keep prices premium relative to mainland Miami.
Property Details
Property Type
Single Family Residence
Year Built
2026
Living Area
1,044 sq ft
Lot Size
7,828 sq ft
Bedrooms
6
Bathrooms
6
Pool
No
Waterfront
No
Cooling
Central Air, Electric
Heating
Electric
Roof Type
Concrete
Flooring
Marble, Wood
Construction
Concrete Block Construction
Style
Detached, Two Story
HOA Fee
None
Annual Taxes
$29,546 (2025)
Days on Market
0
MLS #
A12079811
Features & Amenities
Interior
Appliances
Exterior
Community
Other
Nearby Schools
Assigned public schools pulled from Miami-Dade County Public Schools’s official attendance-boundary data. Verify current boundaries with MDCPS before buying — zones can change year to year.
School data source: Miami-Dade County Open Data Hub
Location
City
Key Biscayne
State
FL
ZIP Code
33149
County
Miami-Dade County
Subdivision
TROPICAL ISLE HOMES SUB
Listing provided by James Duncan at Duncan Studio Real Estate Division PLLC. Data from Miami Association of REALTORS®. All information deemed reliable but not guaranteed. Listing #A12079811.