Key Biscayne Penthouses for Sale

4 listings
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Matthew Gromadzki, Real Estate Broker
Matthew Gromadzki
Real Estate Broker
(786) 370-8570
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Live MLS inventory in Key Biscayne, updated continuously. Florida Lux Real Estate currently tracks 4 active listings here. MLS inventory updated October 17, 2026.

Penthouses for Sale in Key Biscayne: What to Know Before You Search

Beyond the Rickenbacker tollgate, tucked between two state parks, Key Biscayne functions as Miami's island village — a K-8 school and streets where children pedal to the beach. Ordinance limits the condo count and no new building has opened since 2014, which means the scarcity driving prices here is entirely real.

A penthouse is the top of the Key Biscayne market in the most literal sense — the highest floors, the deepest terraces, and the views the rest of the building is priced to look up at. In a market known for a family island village between two state parks, fifteen minutes from Brickell, penthouses trade as trophy assets, valued on light, outdoor square footage and provenance as much as interior size, and the best of them rarely sit on the market for long. This page narrows Key Biscayne to penthouse residences only.

Key Biscayne Market Snapshot

226
Homes sold, last 12 months
$1.6M
Median sale price
61 days
Median time on market

Frequently Asked Questions

What qualifies as a penthouse in Key Biscayne?

There's no single legal definition, but in practice a Key Biscayne penthouse is a top-floor — or top-few-floor — residence, usually with taller ceilings, larger terraces and upgraded finishes, often the building's signature unit. Every listing on this page is flagged as a penthouse in the MLS.

What do penthouses cost in Key Biscayne?

The spread is enormous, because a penthouse atop a mid-rise is a different asset from one crowning a luxury tower. The live listings here show today's asking prices across the whole range — sort by price to see it from the entry level to the trophy tier.

How do I arrange a showing in Key Biscayne?

Each listing on this page carries an inquiry form that goes straight to our brokerage — or reach us at +1 786-370-8570. We schedule private tours to fit your calendar and run live video walkthroughs for buyers relocating from out of state, with no obligation attached.

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