TROPICAL ISLE HOMES SUB

544 Warren Ln, Key Biscayne FL 33149

6 beds · 5.5 baths · 1,044 ft²

For Sale · Active Listing

$8,000,000

Est. Payment $42,579/mo

MLS Sheet Video

6

Bedrooms

5.5

Bathrooms

1,044

Sq. Ft.

2026

Year Built

0

Days on Market

Description

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.

Facts

MLS#
A12079811
Subdivision
TROPICAL ISLE HOMES SUB
Property Type
Residential
Property Sub Type
Single Family Residence
Year Built
2026
Lot Size
7,828 ft²
Sq. Ft.
1,044 ft²
Sq. Mt.
97 m²
Price per sq. ft.
$7,663/ft²
Price per sq. mt.
$82,474/m²
Stories
Garage
Pool
Days on Market
Listed
Aug 29, 2026
Last Updated
Aug 29, 2026
Price/Lot Sq.Ft.
$1,022/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

August 2026

100/100
Buyers marketSellers market

49

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).

8/29/2026Listed for sale$8,000,000

History reflects fields present on the live MLS record. Full multi-year history requires the MIAMI ListingHistory resource (not yet enabled).

Location

544 Warren Ln, Key Biscayne FL 33149Directions

Estimated Monthly Payment

$49,396/mo

Principal & Interest

$42,579

Property Tax

$6,667

Insurance

$150

HOA

$0

20% ($1,600,000)
7.00%
30 years
1.00% (FL avg ~1.0%)
$0/mo
$150/mo

Estimates only. Actual payment depends on credit, lender, insurance carrier, and FL/Miami-Dade specifics. Contact Rangely for a precise quote.

Rangely Adames

Rangely Adames

Sales Associate | Sunland Group

Hablo Español

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 23 hours ago

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