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445 Grand Bay Drive PH-1A
Key Biscayne, FL, 33149
Active$18,900,000
445 Grand Bay Drive PH-1A
Key Biscayne, FL, 33149
Active$18,900,000
5
Bedrooms
6
Bathrooms
8,435 sqft
Living Area
1997
Year Built
Key Biscayne, FL, 33149
Active$18,900,000
Key Biscayne, FL, 33149
Active$18,900,000
5
Bedrooms
6
Bathrooms
8,435 sqft
Living Area
1997
Year Built
112
Days on Market
Data sources: SFWMD AHED waterway polygons · FHWA National Bridge Inventory 2024 · Not provided by the MLS or listing broker.
High above the turquoise waters of Key Biscayne rises a penthouse that simply cannot be replicated. Once featured in Architectural Digest, this legendary corner residence at Grand Bay is a statement of scale, design, and presence. From sunrise over the Atlantic to glittering sunsets across Biscayne Bay and the Miami skyline, the views are cinematic in every direction, offering endless blue water, golden light, and exceptional privacy. Spanning an extraordinary 8,435 square feet under air and 2,825 square feet of terraces, totaling 11,260 square feet as per the developer’s floor plan, the residence is defined by soaring 12-foot ceilings and grand proportions throughout. A dramatic foyer leads to a spectacular Grand Room designed for both intimate living and large-scale entertaining. The formal dining room is separate and elegant, while the completely remodeled kitchen and family room provide comfort and functionality. The fully renovated private library and custom bar enhance the home’s entertaining appeal. The primary suite is serene and expansive. All the bathrooms have just been completely remodeled, offering a fresh spa-inspired experience finished to today’s highest standards. Four (4) additional en-suite bedrooms ensure comfort and privacy. The terraces offer expansive outdoor living in the sky, perfect for sunrise mornings and sunset evenings overlooking the water and skyline. This is not simply a penthouse. It is a landmark residence, rare and impossible to duplicate.
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Key Biscayne, FL, 33149
Displayed by Blue Mar Real Estate Group Inc. — Licensed Florida Real Estate Broker (DBPR CQ1018554) · [email protected]
Listing courtesy of One Sotheby's International Realty via MIAMI REALTORS®
Last updated: 5/4/2026
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Assigned Public Schools
Key Biscayne K-8 Center
Grades PK-8 · Key Biscayne
Ponce de Leon MS
Grades 6-8 · Coral Gables
Coral Gables Senior High
Grades 9-12 · Coral Gables
Nearby Private Schools
School data from Miami-Dade County Open Data Hub. Verify attendance zones with the school district.