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4 Beds
6 Baths
7,400 sqft

$12,990,000

445 Grand Bay PH-2A, Key Biscayne FL, 33149

Price per sqft$1,755.41
Built in1996
Property size7,400 sqft
Property typeCondominium
Courtesy of Brigitte Nachtigall with One Sotheby's International Realty

Overview

Active

Listed Nov 2, 2026

Updated 12 days ago

Experience oceanfront living at its finest in this extraordinary floor-through penthouse at Grand Bay Residences, one of Key Biscayne’s most prestigious luxury addresses. Encompassing an impressive 7,400 square feet under A/C, this exceptional residence offers breathtaking panoramic views of the Atlantic Ocean, Biscayne Bay, and the Miami skyline. Two magnificent, oversized terraces facing east and west create an unparalleled indoor-outdoor living experience, where spectacular sunrises over the ocean and unforgettable sunsets over the bay become part of everyday life. Beautifully upgraded and designed for both grand entertaining and comfortable living, the residence features expansive living areas, an elegant formal dining room, gourmet kitchen, and private home theater. The magnificent primary suite is a true private sanctuary, featuring a generous walk-in closet and two separate, beautifully appointed bathrooms, offering the ultimate in comfort, privacy, and luxury. Three additional spacious bedrooms, each with its own en-suite bathroom, provide exceptional comfort and privacy. Residents enjoy an extraordinary resort-style lifestyle with direct beach and ocean access, concierge and valet services, a state-of-the-art fitness center, a spectacular swimming pool, and the impeccable service of Grand Bay’s dedicated professional staff. A rare opportunity to own a truly remarkable penthouse where space, sophistication and breathtaking views capture the best of this island.

$86,423/mo

Est. mortgage payment based on a $12,990,000 home price.

All estimates are provided by Luxury Presence for informational purposes only. Actual amounts may vary.

Additional information

MLS® ID
A12113410

Interior Features

Bedrooms
4
Bathrooms
6
Cooling
Yes
Heating
Yes
Basement
No

Other Property Details

Taxes
$56,046
Tax Frequency
Annually
View
Yes
Pets Allowed
Yes
Waterfront
Yes
55+/Senior Community
Yes
MLS provider logo

Courtesy of One Sotheby's International Realty, Brigitte Nachtigall,
Listing Contact: 305-710-9664 

Based on information from Martin County REALTORS of the Treasure Coast, Inc. (RAMC) as of 11/3/2026. This information is for your personal, non-commercial use and may not be used for any purpose other than to identify prospective properties you may be interested in purchasing. Display of MLS data is usually deemed reliable but is NOT guaranteed accurate by the MLS. Buyers are responsible for verifying the accuracy of all information and should investigate the data themselves or retain appropriate professionals. Information from sources other than the Listing Agent may have been included in the MLS data. Unless otherwise specified in writing, Broker/Agent has not and will not verify any information obtained from other sources. The Broker/Agent providing the information contained herein may or may not have been the Listing and/or Selling Agent.

©2026 Martin County REALTORS of the Treasure Coast, Inc. All rights reserved.

Data last updated 5:10 AM UTC, 11/3/2026

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