544 Warren Lane, Key Biscayne, FL 33149

$8,000,000 — Active

Property Features

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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.

Property Details

  • Listing ID: A12079811
  • Status: Active
  • Listing Date: 2026-08-29
  • Property Type: Single Family Residence
  • Subdivision: TROPICAL ISLE HOMES SUB
  • County: Miami-Dade
  • MLS Area: 2520
  • Bedrooms: 6
  • Full Bathrooms: 5
  • Half Bathrooms: 1
  • Living Area Sq Ft: 1,044
  • Year Built: 2026

Financial

  • List Price: $8,000,000
  • HOA Fee: None
  • Taxes: $29,546/yr

Features & Amenities

  • View: Garden, Pool
  • 55+ Community (HOPA): Yes
  • Furnished: Furnished
  • Parking: Attached Carport, Driveway, On Street, Carport
  • Cooling: Central Air, Electric
  • Heating: Electric
  • Flooring: Marble, Wood
  • Construction: Block
  • Roof: Concrete
  • Interior Features: Vaulted Ceiling(s), Walk-In Closet(s)
  • Exterior Features: Built-in Barbecue
  • Community Amenities: Other

Courtesy of Duncan Studio Real Estate Division PLLC
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RAPB

© 2026 Starfish Real Estate. Listings updated Nov 5, 2026 5:00 am. Listing data is derived from the Broker Reciprocity Program of the Realtor Association of Indian River County (RAIRC) and BeachsMLS. Properties listed by brokers other than Starfish Real Estate are identified with the applicable MLS logo and include the listing broker's name. Not all properties available through either MLS may be displayed. All MLS data is the copyrighted property of the respective MLS and its participants. Data is deemed reliable but is not guaranteed accurate and should be independently verified prior to entering into any transaction.