Single Family Residence
544 Warren Ln
544 Warren Ln, Key Biscayne FL 33149
$8,000,000
6 Beds · 5 Baths · 1,044 SqFt
See estimated monthly costThis listing is courtesy of Duncan Studio Real Estate Division PLLC. James Duncan
Overview
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 & features
Interior
- Living area (sq ft)
- 1,044
- Full bathrooms
- 5
- Half bathrooms
- 1
- Furnished
- Furnished
- First Floor Entry
- Vaulted Ceiling(s)
- Walk-In Closet(s)
- Other
Building & exterior
- Year built
- 2026
- Lot size (sq ft)
- 7,828
- Covered spaces
- 2
- Garden
- Pool
- Built-In Grill
- Attached Carport
- Driveway
- On Street
HOA (homeowners association)
- No Restrictions
Taxes
- Annual tax
- $29,546
- Tax year
- 2025
- Parcel number
- 24-52-05-002-0160
Assigned schools
- Elementary
- Keybiscayne
- Middle
- Ponce De Leon
- High
- Mast Academy
Listing
- MLS number
- A12079811
- Property type
- Single Family Residence
- Price per SqFt
- $7,663
- Subdivision
- TROPICAL ISLE HOMES SUB
- On market since
- Aug 29, 2026
- Days on market
- 0
Estimated monthly cost
$48,915 per month
- Principal & interest (30 yr)
- $40,452
- Property tax
- $2,462
- Insurance (estimated)
- $6,000
An estimate for comparison only — not a loan offer, a quote, or a commitment to lend. Actual taxes, insurance and financing terms will differ.
Location
Nearby schools
- Key Biscayne K-8 Center
- Key Biscayne Presbyterian School
- St Agnes Academy
- St Christophers - By-The-Sea Montessori School
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