




52 photos
445 Grand Bay Drive #PH-1A
Key Biscayne, FL 33149
Listing courtesy of One Sotheby's International Realty (Brigitte Nachtigall). Contact: [email protected].
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.
- Principal and interest
- $95,569
- Property tax
- $29,057
- Homeowners insurance
- $11,817
- HOA
- $0
An estimate, not a loan offer. The rate and insurance are assumptions to edit with your own quotes; Florida insurance varies widely by age, construction and distance to the coast. Flood insurance and PMI are not included.
Estimate: the price times the Miami-Dade County average total millage (18.49 mills, Florida Department of Revenue, 2025 average total millage by county), less the homestead exemptions. The actual bill depends on the city, the assessed value and special assessments. Save Our Homes then caps annual assessment increases at 3% or inflation, whichever is lower.
Inside the 1% annual chance floodplain. Lenders require flood insurance on a financed home; ask for the elevation certificate.
Sources: FEMA National Flood Hazard Layer and the Florida Division of Emergency Management evacuation zones, looked up at the listing point. Confirm with an elevation certificate and your insurer.
Listing data provided by the Southeast Florida Multiple Listing Service (MIAMI REALTORS®). The data is deemed reliable but is not guaranteed accurate by the MLS. IDX information is provided exclusively for consumers' personal, non-commercial use, may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing, and is deemed reliable but is not guaranteed accurate by the MLS. Atlantic Luxury Advisors is a real estate team at Keller Williams Realty. Payment, tax and flood figures on this page are estimates by Atlantic Luxury Advisors, not MLS data.

