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+20

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

Mortgage Calculator

Estimate your monthly payment for this waterfront property

Loan Term

Down Payment

20%

$3,780,000 down

Interest Rate

%

Principal & Interest$98,068/mo

Property Tax (est. ~1.2%, varies by county)$18,900/mo

Home Insurance (est.)$250/mo

Total Monthly Payment$117,218

Loan Amount: $15,120,000Rate: 6.75%

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Estimated payments only. Actual rates and terms may vary.

Comparable Sales

$18,900,000Tour the dockSchedule a Showing

112

Days on Market

Dock & Water AccessMLS

Ocean AccessOcean Front

Data sources: SFWMD AHED waterway polygons · FHWA National Bridge Inventory 2024 · Not provided by the MLS or listing broker.

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.

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Location

Key Biscayne, FL, 33149

No price history available for this property.

Listing courtesy of One Sotheby's International Realty

Last updated: 6/29/2026

© 2026 Miami Association of REALTORS®, Inc. All rights reserved. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange program of the Miami Association of REALTORS®. Information is deemed reliable but not guaranteed. All properties are subject to prior sale, change, or withdrawal.

IDX information is provided exclusively for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

FEMA Flood Zone AE

BFE: 9ft

Special Flood Hazard Area

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Nearby Schools

Assigned Public Schools

E

Key Biscayne K-8 Center

Grades PK-8 · Key Biscayne

M

Ponce de Leon MS

Grades 6-8 · Coral Gables

H

Coral Gables Senior High

Grades 9-12 · Coral Gables

Nearby Private Schools

St Christophers - By-The-Sea Montessori School0.5 mi

St Agnes Academy0.6 mi

School data from Miami-Dade County Open Data Hub. Verify attendance zones with the school district.