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.
Property Details
Price:
$18,900,000
MLS #:
A11954185
Status:
Active
Beds:
5
Baths:
5.5
Type:
Condo
Subtype:
Condominium
Subdivision:
GRAND BAY RESIDENCES COND,GRAND BAY
Neighborhood:
grandbayresidencescond
Listed Date:
Feb 14, 2026
Finished Sq Ft:
8,435
Total Sq Ft:
11,260
Year Built:
1997
See this Listing
Schools
Elementary School:
Keybiscayne
Interior
Appliances
Dishwasher, Disposal, Dryer, Electric Water Heater, Ice Maker, Microwave, Electric Range, Refrigerator, Wall Oven, Washer
Bathrooms
5 Full Bathrooms, 1 Half Bathroom
Cooling
Electric
Flooring
Carpet, Marble, Wood
Heating
Electric
Exterior
Architectural Style
Corner Unit, High Rise, Penthouse
Association Amenities
Bike Storage, Community Room, Exercise Room, Pool
Community
55+
Construction Materials
CBS Construction
Exterior Features
Open Balcony
Parking Features
2 Or More Spaces, Covered, Valet, No Rv/Boats, No Trucks/Trailers
Security Features
Fire Alarm, Smoke Detector, Elevator Secure, Secured Garage/Parking, Guard At Site
Financial
HOA Frequency
Monthly
Maintenance Fee
$9,923
Tax Year
2025
Taxes
$54,141
Map
Community
- Address445 Grand Bay Drive # 1A Key Biscayne FL
- SubdivisionGRAND BAY RESIDENCES COND,GRAND BAY
- CityKey Biscayne
- CountyMiami-Dade County
- Zip Code33149
Market Summary
Current real estate data for Condo in Key Biscayne as of Mar 06, 2026
125
Condo Listed
120
Avg DOM
1,122
Avg $ / SqFt
$2,574,074
Avg List Price
Property Summary
- Located in the GRAND BAY RESIDENCES COND,GRAND BAY subdivision, 445 Grand Bay Drive # 1A Key Biscayne FL is a Condo for sale in Key Biscayne, FL, 33149. It is listed for $18,900,000 and features 5 beds, 6 baths, and has approximately 8,435 square feet of living space, and was originally constructed in 1997. The current price per square foot is $2,241. The average price per square foot for Condo listings in Key Biscayne is $1,122. The average listing price for Condo in Key Biscayne is $2,574,074.
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