For saleActiveListed Aug 29, 2026 · 53 days
$8,000,000

544 Warren Ln, Key Biscayne, FL 33149

6 beds5 full, 1 half baths1,044 sq ftBuilt 2026

As of , this 6 bedroom, 5 full and 1 half bath house is for sale at $8,000,000. It was listed on .

MLS data updated .

Key facts

Type
House
Year built
2026
Property tax
$29,546 (2025)
View
Garden, Pool
Waterfront
No
Cooling
Central Air, Electric
Heating
Electric
MLS number
A12079811

Listing information

Listing courtesy of Duncan Studio Real Estate Division PLLC, 305-979-2520, james@james-duncan.com

Listing agent: James S Duncan, james@james-duncan.com

BeachesMLS. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright ©2026 BeachesMLS, Inc.

MIAMI MLS. Listing data from MIAMI MLS (South East Florida Regional MLS). Information is deemed reliable but not guaranteed.

Listing information is provided for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify homes consumers may want to buy or rent.

Listing last changed .

From the listing

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.

The text above is the listing description from the MLS, as written by the listing agent.

The Key Biscayne market

As of , the median asking price in Key Biscayne is $2,235,000, or $1,141 per sq ft, across 147 listings for sale. The median listing for sale there has been on the market for 110 days.

Price and status history

Listing date
Days on market
53
Original list price
$8,000,000
Price changes
0
DateEventPrice
Listed$8,000,000

From the MLS. RealVista does not show sold prices.

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