Premier Brokers International
445 Grand Bay Drive PH-1A, Key Biscayne, FL 33149
ActiveMLS listing sourceMIAMI REALTORS® MLS
ActiveMLS® A11954185
$18,900,000

445 Grand Bay Drive PH-1A, Key Biscayne, FL 33149

Beds
5
Baths
6
Sqft
8,435
Est. payment$121,953/mo
Home type
Condominium
Year built
1997
Lot size
—
Price / sqft
$2,241
HOA
$9,923/mo
Community
GRAND BAY RESIDENCES COND

Property description

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.

Listing activity

Days on market
251
Listed
Feb 14, 2026
MLS listing updated
Aug 13, 2026
Feed last checked
6 minutes ago

Listed by Brigitte Nachtigall · One Sotheby's International Realty

Map

Map location is based on MLS-supplied coordinates. Verify the location before relying on it.

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms
5
Bathrooms
6
Bathrooms (decimal)
5.5
Full bathrooms
5
Half bathrooms
1

Rooms & features

Rooms
3
Interior features
Built-in Features, Closet Cabinetry, Entrance Foyer, High Ceilings, Pantry, Walk-In Closet(s), Wet Bar
Flooring
Carpet, Marble, Wood
Appliances
Electric Water Heater, Dishwasher, Disposal, Dryer, Electric Range, Ice Maker, Microwave, Oven, Refrigerator, Washer
Furnished
Unfurnished
Window features
Blinds, Drapes, Rods

Heating & cooling

Heating
Electric
Cooling
Electric
Property

Parking

Garage spaces
0
Carport spaces
0
Covered spaces
0
Parking features
Covered, Garage Door Opener, Valet
Attached garage
No

Exterior

Stories
14
Building area
11,260 sqft
Exterior features
Balcony
View
Ocean, Direct Ocean, Bay
Waterfront
Ocean Access, Deeded Beach Access, Ocean
Waterfront property
Yes
Construction

Type & style

Home type
Condominium
Year built
1997
New construction
No

Materials

Construction
CBS
Property condition
Resale
Faces
East
Utilities & green energy

Utilities

Electric
Fuses
Utilities
Cable Available
Community & HOA

Community

Subdivision
GRAND BAY RESIDENCES COND
MLS area
2520
Security
Elevator Secure, Fire Alarm, Secured Garage/Parking, Security Guard, Smoke Detector(s)
Pets allowed
Pet Restrictions Possible, Yes
55+ community
Yes

Association

Has association
Yes
Association fee
$9,923 monthly
Estimated monthly dues
$9,923
Amenities
Pool, Bike Storage, Community Room, Fitness Center, Management
Services included
Cable TV, Common Areas, Maintenance Grounds, Security, Sewer, Water
Lease details

Not reported by the listing source.

Location

Area details

City
Key Biscayne
County
Miami-Dade
ZIP code
33149
Manufactured home details

Not reported by the listing source.

Financial & listing details

Listing

MLS number
A11954185
Possession
Negotiable
Original list price
$18,900,000
Parcel number
2452050491350
Annual property tax
$54,141
Tax year
2025
Tax legal description
GRAND BAY RESIDENCES CONDO UNIT PH-1A UNDIV 1.7892% INT IN COMMON ELEMENTS OFF REC 17374-0773 OR 17905-3465 1297 1
Additional MLS details

Reported by the listing source

Association Amenities
Pool, Bike Storage, Community Room, Fitness Center, Management
Association Fee Frequency
Monthly
Association Fee Includes
Cable TV, Common Areas, Maintenance Grounds, Security, Sewer, Water
Association
Yes
Bathrooms Total Decimal
5.5
Bathrooms Total Integer
6
Building Area Total
11260
Construction Materials
CBS
County Or Parish
Miami-Dade
Days On Market
251
Direction Faces
East
Elementary School
Key Biscayne K-8
High School
Coral Gables
List Price
18900000
Listing Contract Date
2026-02-14
Living Area
8435
MLSArea Major
2520
Middle Or Junior School
Ponce De Leon
Mls Status
Active
On Market Date
2026-02-14
Photos Count
52
Postal Code
33149
Property Sub Type
Condominium
Property Type
Residential
Rooms Total
3
Security Features
Elevator Secure, Fire Alarm, Secured Garage/Parking, Security Guard, Smoke Detector(s)
Senior Community
Yes
Standard Status
Active
State Or Province
FL
Status Change Timestamp
2026-02-14T05:00:00Z
Stories Total
14
Subdivision Name
GRAND BAY RESIDENCES COND
Waterfront Features
Ocean Access, Deeded Beach Access, Ocean
Tax Annual Amount
54141
Bathrooms Full
5
Bedrooms Total
5
Bathrooms Half
1
General Property Information: Senior Community
Yes
Financial Information: Estimated Monthly Assoc Recurring Fee
9923

Market value

Automated estimate—No licensed valuation source connected
Estimated sales range—Ask Karim for a local market analysis
Estimated rent—No licensed rental valuation source connected

Price history

DateEventPrice
Feb 14, 2026ListedMIAMI REALTORS® MLS$18,900,000$2,241/sqft

Public tax history

YearProperty taxesAssessment
2025$54,141—

Payment calculator

Estimated monthly payment$121,953/moIllustrative estimate, not a loan offer.
Principal & interest
$98,068
Property taxes
$4,512
Insurance
$9,450
Association dues
$9,923

Live national rate context is displayed below through Mortgage News Daily’s official widget. The calculator rate remains a separate assumption until licensed machine-readable access is connected. This is not a loan offer.

Neighborhood

Area

GRAND BAY RESIDENCES COND

Key Biscayne · Miami-Dade County · 33149

Climate risk

—

No licensed climate-risk source is connected.

Nearby schools

Key Biscayne K-8Elementary
—
Ponce De LeonMiddle
—
Coral GablesHigh
—
School names and districts are MLS-reported when available. Verify attendance boundaries with the school district. Ratings require a licensed ratings provider.

Nearby homes

12 homes

Similar homes

12 homes
MLS listing source

MIAMI REALTORS® MLS · Listing courtesy of One Sotheby's International Realty. All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright ©2026 BeachesMLS, Inc. IDX information is provided exclusively for consumers’ personal, non-commercial use and may be used only to identify prospective properties they may be interested in purchasing or leasing. Terms of use · Equal Housing Opportunity.