NEW CONSTRUCTION

For sale

$8,000,000

Est. $50,506/mo —

•

1,044

sq ft

544 Warren Ln, Key Biscayne, FL 33149

About this home

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.

Single-familyProperty Type

2026Year Built

7,828 sq ftLot Size

$7,663Price/Sq.Ft.

2 spacesParking

Listed by James Duncan • Duncan Studio Real Estate Division PLLC

•305-979-2520 (agent)

•james@james-duncan.com (agent)

•305-979-2520 (broker)

•james@james-duncan.com (broker)

Listed by Rocio Figueroa • Duncan Studio Real Estate Division PLLC

•305-979-2520 (broker)

•james@james-duncan.com (broker)

Listing updated: Sep 9, 2026 at 10:55pm

Redfin checked: 3 minutes ago

•Source:MARMLS #A12079811

Payment calculator

$50,506 per month

Principal and interest$42,043

Property taxes

$2,462

HOA dues

Home insurance

$6,000

Utilities

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See this home in person

This home is unavailable to tour on this day.

Next available date: Friday, September 11

Open houses

No upcoming open houses.

Nearby open houses (10)

OPEN FRI, 4PM TO 8PM
$1,650,000
4 beds4 baths— sq ft
3322 SW 23 St, Miami, FL 33145
(305) 204-8278
OPEN SAT, 11AM TO 2PM
$3,350,000
4 beds3 baths2,848 sq ft
145 S Prospect Dr, Coral Gables, FL 33133
(305) 662-7325
OPEN SAT, 12PM TO 3PM
$747,500
6 beds3 baths1,540 sq ft
1028 NW 24th St, Miami, FL 33127
(321) 939-3748
OPEN SAT, 12PM TO 2PM
$2,685,000
4 beds4 baths2,874 sq ft
3082 Indiana St, Miami, FL 33133
(305) 697-5402
OPEN SAT, 12PM TO 2PM
$1,299,999
3 beds2 baths1,718 sq ft
2635 SW 64th Ave, Miami, FL 33155
(305) 667-4815
OPEN SAT, 1PM TO 3PM
$2,700,000
4 beds3.5 baths3,055 sq ft
2957 Coconut Ave, Miami, FL 33133
(305) 851-2820
OPEN SAT, 1PM TO 3PM
$5,250,000
5 beds4.5 baths3,529 sq ft
444 Bargello Ave, Coral Gables, FL 33146
(305) 851-2820
OPEN SUN, 12PM TO 2PM
$1,330,000
3 beds3 baths1,769 sq ft
1114 Columbus Blvd, Coral Gables, FL 33134
(305) 446-2001
OPEN SUN, 12PM TO 3PM
$837,000
3 beds2 baths1,397 sq ft
2228 SW 2nd St, Miami, FL 33135
(321) 939-3748
OPEN SUN, 1PM TO 3PM
$1,299,000
4 beds3.5 baths2,724 sq ft
8260 SW 88th St, Miami, FL 33156
(305) 858-2700

Around this home

Schools

K - 12
Preschool & daycare

Key Biscayne K-8 Center

Public PreK-8 • Assigned • 0.2mi

8/10

Coral Gables Senior High School

Public PreK-12 • Assigned • 6.5mi

5/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Offer insights

544 Warren Ln · $8,000,000

Strong offer

$7.98M and above

75% chance or better to win

Why $7.98M+ is a strong offer

DAYS ON MARKET

The average home goes pending in 71 days.

SALE-TO-LIST

Most homes are selling 4% below list price.

About offer insights

Property details

Interior
Exterior
Finance

Kitchen

Bathroom

Bedroom

Living

Dining

Interior features
Impact glass windows
Furnished
Fireplace
Vaulted ceilings
Walk-in closets
First floor entry
Bedroom on main level

Bedrooms
Includes a bedroom on the main level

Bathrooms
5 full bathrooms
1 half bathroom

Kitchen
Gas range
Icemaker

Laundry & utility
Washer/dryer details not provided

Flooring
Hardwood
Marble
Wood

Heating & cooling
Central air conditioning (electric)
Electric heating

Sale and tax history for 544 Warren Ln

Sale History
Tax History

Date

Event

Price

MARMLS #A12079811

Aug 29, 2026

Listed

$8,000,000

$7,663/sq ft

Public Records

Jun 19, 2020

Sold

$1,052,500

$1,008/sq ft

MARMLS #A10833693

Jun 18, 2020

Sold

$1,085,000

$1,039/sq ft

Mar 13, 2020

Listed

$1,190,000

$1,140/sq ft

MARMLS #A10518669

Aug 7, 2019

Listing Removed

—

Jan 5, 2019

Price Changed

$1,395,000

$1,336/sq ft

Aug 8, 2018

Listed

$1,675,000

$1,604/sq ft

MARMLS #A1584726

Apr 17, 2012

Sold

$998,000

$956/sq ft

Dec 16, 2011

Listed

$998,000

$956/sq ft

Public Records

Apr 1, 1973

Sold

$62,000

$59/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$30,778 (+11.4%)

2024

$27,639 (+5.0%)

2023

$26,323 (+18.8%)

2022

$22,150 (+12.8%)

2021

$19,644 (+16.2%)

2020

$16,907 (−14.5%)

$1,084,178 + $42,470

$1,126,648

2019

$19,770 (−1.1%)

$1,135,060 + $56,648

$1,191,708

2018

$19,996 (−19.5%)

$1,135,060 + $110,623

$1,245,683

2017

$24,834 (+2.9%)

$1,135,060 + $110,623

$1,245,683

2016

$24,145 (+7.3%)

2015

$22,498 (+8.7%)

2014

$20,705 (+14.4%)

2013

$18,093 (+202.8%)

2012

$5,975 (+2.5%)

$743,660 + $162,085

$905,745

2011

$5,828

Public record

Public record
Zoning
Permits

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

7,828 Sq. Ft.

Year renovated

1961

Finished Sq. Ft.

1,044

Unfinished Sq. Ft.

—

Total Sq. Ft.

1,044

Year built

1951

Style

Single Family Residential

County

Miami-Dade County

APN

2452050020160

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Jul 1, 2026.

May 20, 2026 • Final

Sub-permit zoning

Remove multiple trees from the property, including a ficus, an umbrella tree, a European fan palm, areca palms, and an alexander palm.

Grading

May 20, 2026 • Final

Master building

Complete demolition of a single-family home.

Demolition

Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.

Climate risks

9/10 Flood Factor

Estimated 80%+ chance of a flood reaching the building in the next 30 years

1/10 Fire Factor

Unlikely to be in a wildfire in next 30 years

Heat Factor

We're working on getting current and accurate heat risk information for this home.

10/10 Wind Factor

99% chance of strong winds in next 30 years

2/10 Air Factor

1 unhealthy days expected this year, 1 days in 30 years

Provided by First Street

Historical weather

Key Biscayne, FL • 33149

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

89/ 100

Very good sunlight

Sunscore

There appears to be minimal shading by surrounding buildings, terrain, and vegetation.

9.7 hrs

7.1 hrs

JuneDecember

Provided by Shadowmap

Redfin Estimate for 544 Warren Ln

We cannot show automated home-value estimates for this home.

Nearby homes have recently sold between $2,625,000 and $10,500,000.

Nearby comparable homes

The Redfin Estimate uses 6 recent nearby sales, priced between $2.6M to $10.5M.

SOLD JUL 15, 2026
$3,010,000 Last sold price
3 beds2 baths2,113 sq ft
204 Westwood Dr, Key Biscayne, FL 33149
$6238/sq ft
75 years older
SOLD NOV 12, 2025
$2,625,000 Last sold price
3 beds1 bath1,265 sq ft
737 Woodcrest Rd, Key Biscayne, FL 33149
$5588/sq ft
75 years older
SOLD JUL 1, 2026
$10,500,000 Last sold price
5 beds5.5 baths5,074 sq ft
110 Reef Ln, Key Biscayne, FL 33149
$5594/sq ft
larger lot
12 years older
SOLD JUL 8, 2026
$7,250,000 Last sold price
4 beds4.5 baths3,243 sq ft
2841 Emathla St, Miami, FL 33133
$5427/sq ft
larger lot
29 years older
SOLD APR 13, 2026
$2,850,000 Last sold price
3 beds2 baths2,388 sq ft
760 Allendale Rd, Key Biscayne, FL 33149
$6470/sq ft
76 years older
SOLD JUL 27, 2026
$4,700,000 Last sold price
5 beds6 baths3,285 sq ft
346 Gulf Rd, Key Biscayne, FL 33149
$6232/sq ft
larger lot
73 years older

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Early Access listings

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New listings for sale in 33149

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NEW 28 HRS AGO

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755 Curtiswood Dr, Key Biscayne, FL 33149

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NEW 30 HRS AGO

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199 Ocean Lane Dr #206, Key Biscayne, FL 33149

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$825,000

1 bed1.5 baths895 sq ft

155 Ocean Lane Dr #103, Key Biscayne, FL 33149

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2 beds2 baths1,335 sq ft

150 Ocean Lane Dr Unit 2H, Key Biscayne, FL 33149

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Details provided by MARMLS and may not match the public record. Learn more.

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About this home

Payment calculator

See this home in person

Nearby open houses (10)

Around this home

Schools

Lifestyle

Offer insights

Property details

Sale and tax history for 544 Warren Ln

Public record

Climate risks

Historical weather

Sun exposure

Redfin Estimate for 544 Warren Ln

Early Access listings

Nearby similar homes

New listings for sale in 33149

More real estate resources