20 photos

445 Grand Bay Drive #PH-1A

$18,900,000

5 bd · 5.5 ba · 8,435 sqft · Grand Bay Residences · Key Biscayne

22% above Grand Bay Residences’s asking median $/sqft
Negotiation read: On the market 180 days — longer than this building’s typical ~46.
Status
For sale
Price per sqft
$2,241/sqft
HOA
$0/mo
Year built
1997
Floor
14
Parking
0
Furnished
Unfurnished
View
Bay, Ocean View, Direct Ocean
Waterfront
Yes
Days on market
180
Listed
Feb 14, 2026
MLS #
A11954185

About this unit

This expansive penthouse at Grand Bay offers a unique sense of scale and design with cinematic views of the Atlantic, Biscayne Bay, and the Miami skyline. The residence features 8,435 square feet of interior space under air and 2,825 square feet of terrace space, characterized by soaring 12-foot ceilings and grand proportions. The layout includes a dramatic foyer, a large Grand Room for entertaining, a formal dining room, and a remodeled kitchen and family room. Additional features include a fully renovated private library, a custom bar, and a serene, expansive primary suite. All bathrooms have been recently remodeled to a spa-inspired standard. The home includes four additional en-suite bedrooms and extensive terrace space for outdoor living

Listing courtesy of One Sotheby's International Realty — Brigitte Nachtigall (Lic. #0542022) · MLS #A11954185 · Updated Aug 13, 2026

Neighborhood & lifestyle

What's around this home in Key Biscayne — transit, parks, dining and landmarks within reach.

Nearby & transit
Crandon ParkBill Baggs Cape Florida State ParkRickenbacker CausewayCrandon Park MarinaKey Biscayne Village GreenMiami Seaquarium