$18,500,000list price
Price cut$1,400,000
5 bd · 4 ba · 3,085 sq ft House
520 S MASHTA DR #33149, KEY BISCAYNE, FL 33149
Listing courtesy of Coldwell Banker Realty. MLS# A12071221.On the MLS · Listed Aug 10
$19,800,000
100 CAPE FLORIDA DR #33149, KEY BISCAYNE, FL 33149
4 beds7 baths8,240 sq ftHouseBuilt 2007
Updated today, November 3, 2026This home against Key Biscayne
$2,403 per sq ft, 98% over the Key Biscayne median
302 days on the market
$155,395 in property taxes (2025)
16,553 sq ft lot
Private pool
Waterfront
7 car garage
Key Biscayne today: 129 homes for sale, median list price $2,725,000.
About this home
Enjoying an exceptional 270ft of L-shaped water frontage facing 185-ft-wide Pines Canal and the natural beauty of Bill Baggs Cape Florida State Park, this elegant island-coastal estate is tailored to a boating lifestyle. Offering calm and naturally sheltered harbor, concrete seawall, boat lift, dockside kitchen and side-dock boat storage that preserves unobstructed water views, the property provides a sense of openness, privacy, and tranquility. Clean architectural lines, an internal garden courtyard, and generous covered terraces fill the residence with natural light and create a seamless connection to the surrounding water and landscape. This elevated home offers 4 bedrooms plus staff quarters, 5 bathrooms, and 4 half-baths within 8,240 sqft of living space on a 16,500-sqft lot.Architectural tray ceilings, refined millwork, custom wall paneling, and thoughtfully designed built-ins with abundant storage add depth and craftsmanship while maintaining a light, contemporary coastal aesthetic. Formal living and dining rooms with elegant millwork provide an ideal setting for entertaining. The kitchen is appointed with Calacatta Gold marble countertops, gas cooking, Sub-Zero and Viking appliances, and a butler’s pantry. Additional highlights include 2 family rooms, fitness center with water views, 2 garages accommodating 7+ cars/golf carts, temperature-controlled wine cellar for 1,400+ bottles, elevator, retractable screen doors, generator and saltwater heated pool.
Zoned schools
Elementary: Key Biscayne K-8 Center
Middle: Ponce de Leon Middle School
High: Coral Gables Senior High School
From Miami-Dade County Public Schools attendance zones.
Listing courtesy of One Sotheby's International Realty. MLS# A11934196.
Listing information is provided by the MLS and is deemed reliable but not guaranteed.
Listed January 5, 2026.
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