New construction

$8,000,000

544 Warren Ln, Key Biscayne, FL 33149

6beds

1,044sqft

$58,245/mo

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Single Family Residence

Built in 2026

7,828 Square Feet Lot

$-- Zestimate^®

$7,663/sqft

$-- HOA

What's special

Six generously proportioned bedroomsRefined finishes withinEffortless flow between roomsThoughtfully placed windowsSoaring ceilingsBespoke millworkGraceful gabled facade

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.

28 days
898
78

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 6
Bathrooms: 6
Full bathrooms: 5
1/2 bathrooms: 1

Heating

Electric

Cooling

Central Air, Electric

Appliances

Included: Gas Range, Ice Maker

Features

Vaulted Ceiling(s), Walk-In Closet(s), Other
Flooring: Marble, Wood
Doors: High Impact Doors
Windows: Clear Impact Glass
Has fireplace: Yes
Furnished: Yes

Interior area

Total structure area: 2,229
Total interior livable area: 1,044 sqft

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Property

Parking

Total spaces: 2
Parking features: Attached Carport, Driveway, On Street
Carport spaces: 2
Has uncovered spaces: Yes

Features

Stories: 2
Entry location: First Floor Entry
Patio & porch: Open Porch
Exterior features: Built-in Barbecue
Has private pool: Yes
Pool features: In Ground, Pool Only
Has spa: Yes
Has view: Yes
View description: Garden, Pool

Lot

Size: 7,828 Square Feet
Features: Less Than 1/4 Acre Lot

Details

Parcel number: 2452050020160
Zoning: 0100

Construction

Type & style

Home type: SingleFamily
Property subtype: Single Family Residence

Materials

Concrete Block Construction
Roof: Concrete

Condition

New Construction
New construction: Yes
Year built: 2026

Utilities & green energy

Sewer: Public Sewer
Water: Municipal Water

Community & HOA

Community

Features: Additional Amenities
Subdivision: Tropical Isle Homes Sub

HOA

Has HOA: No

Location

Region: Key Biscayne

Financial & listing details

Price per square foot: $7,663/sqft
Tax assessed value: $2,216,694
Annual tax amount: $29,546
Date on market: 8/29/2026
Listing terms: All Cash,Conventional,Owner Will Carry

Estimated market value

Not available

Estimated sales range

Not available

Price history

Date	Event	Price
8/29/2026	Listed for sale	$8,000,000+637.3%$7,663/sqft
Source: MIAMI #A12079811 Report a problem
6/18/2020	Sold	$1,085,000-8.8%$1,039/sqft
Source: MIAMI #A10833693 Report a problem
3/13/2020	Listed for sale	$1,190,000-14.7%$1,140/sqft
Source: London Real Estate Co. #A10833693 Report a problem
8/8/2019	Listing removed	$1,395,000$1,336/sqft
Source: London Real Estate Co. #A10518669 Report a problem
1/5/2019	Price change	$1,395,000-16.7%$1,336/sqft
Source: London Real Estate Co. #A10518669 Report a problem
8/9/2018	Listing removed	$4,500$4/sqft
Source: London Real Estate Co. #A10480004 Report a problem
8/9/2018	Listed for sale	$1,675,000+67.8%$1,604/sqft
Source: London Real Estate Co. #A10518669 Report a problem
7/19/2018	Price change	$4,500-6.2%$4/sqft
Source: London Real Estate Co. #A10480004 Report a problem
6/8/2018	Listed for rent	$4,795+11.5%$5/sqft
Source: London Real Estate Co. #A10480004 Report a problem
8/29/2017	Listing removed	$4,300$4/sqft
Source: London Real Estate Co. #A10277770 Report a problem
7/20/2017	Price change	$4,300-14%$4/sqft
Source: London Real Estate Co. #A10277770 Report a problem
5/16/2017	Listed for rent	$5,000$5/sqft
Source: London Real Estate Co. #A10277770 Report a problem
5/18/2014	Listing removed	$5,000$5/sqft
Source: Alway Group Of Miami Report a problem
12/27/2013	Listed for rent	$5,000+11.1%$5/sqft
Source: London Real Estate Co. #A1885046 Report a problem
6/30/2012	Listing removed	$4,500$4/sqft
Source: London Real Estate Co. #A1639352 Report a problem
5/11/2012	Listed for rent	$4,500$4/sqft
Source: London Real Estate Co. #A1639352 Report a problem
4/17/2012	Sold	$998,000$956/sqft
Source: Public Record Report a problem
1/11/2012	Listing removed	$998,000$956/sqft
Source: Coldwell Banker Residential Real Estate - Key Biscayne #A1584726 Report a problem
12/17/2011	Listed for sale	$998,000$956/sqft
Source: Coldwell Banker Residential Real Estate - Key Biscayne #A1584726 Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	$30,778 +11.4%	$1,648,697 +10%
2024	$27,639 +5%	$1,498,816 +9.9%
2023	$26,323 +18.8%	$1,363,243 +10%
2022	$22,150 +12.8%	$1,239,312 +10%
2021	$19,644 +16.2%	$1,126,648 +10.3%
2020	$16,907 -14.5%	$1,021,281 -14.3%
2019	$19,770 -1.1%	$1,191,708 -4.3%
2018	$19,996	$1,245,683 -18.9%
2017	$19,996 -19.5%	$1,535,474 +10%
2016	$24,834 +10.4%	$1,395,886 +10%
2015	$22,498 +8.7%	$1,268,988 +10%
2014	$20,706 +246.6%	$1,153,626 +10%
2013	$5,975	$1,048,751 +171.2%
2012	$5,975 +2.5%	$386,674 +3%
2011	$5,828 -5.1%	$375,412 +1.5%
2010	$6,144 +8.4%	$369,865 +2.7%
2009	$5,666 +0.7%	$360,142 +12.8%
2007	$5,624 -6.1%	$319,304
2006	$5,991	--
2005	$5,991 +1.5%	--
2004	$5,904 +2.2%	--
2003	$5,775 +3.3%	--
2002	$5,591	--
2001	$5,591	--