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Slice RealtyPropiedad Futura

$18,900,000

5 bd · 6 ba · 8,435 sq ft · Condominium

445 Grand Bay Drive # 1A, Key Biscayne FL 33149

For Sale · Active listing

Est. payment $95,569/mo · Mortgage calculator

Listed by One Sotheby's International Realty / Brigitte Nachtigall

Contact: 305-710-9664 (listing contact).

Shown through Slice Realty. Requests from this page reach Slice Realty / Propiedad Futura, not the listing agent.

About this home

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.

Facts
MLS #
A11954185
Subdivision
GRAND BAY RESIDENCES COND,GRAND BAY
Property type
Residential
Property subtype
Condominium
Sq. ft.
8,435
Price per sq. ft.
$2,241 / sq ft
Year built
1997
Days on market
180
County
Miami-Dade County
Date listed
Feb 14, 2026
Last updated
Aug 13, 2026
Financial considerations
Taxes
$54,141 (2025)
HOA amenities
Bike Storage, Community Room, Exercise Room, Pool
Exterior features
Waterfront
Yes
View
Bay, Ocean View, Direct Ocean
Construction
CBS Construction
Additional features
Open Balcony
Interior features
Furnished
Unfurnished
Heating
Electric
Cooling
Electric
Appliances
Dishwasher, Disposal, Dryer, Electric Water Heater, Ice Maker, Microwave, Electric Range, Refrigerator, Wall Oven, Washer
Window features
Blinds, Drapes
Additional features
Built-in Features, Closet Cabinetry, Entrance Foyer, Pantry, Volume Ceilings, Walk-In Closet(s), Wet Bar, Den/Library/Office, Family Room, Great Room
Additional features
Pets allowed
Restrictions Or Possible Restrictions
Security
Fire Alarm, Smoke Detector, Elevator Secure, Secured Garage/Parking, Guard At Site

Mortgage calculator

Includes principal and interest, taxes and insurance.

Rate shown is a default estimate. Confirm with your lender.

Loan amount$15,120,000
Total cost of mortgage$34,404,727
Monthly payment$95,569

Local context (our analysis)

Area stats are available for our covered neighborhoods. See neighborhoods.

Source: Southeast Florida MLS (SEFMLS). Last updated Aug 13, 2026, 11:43 AM ET

Listing data is deemed reliable but is not guaranteed accurate by the MLS. Information is provided for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.