Luxury Homes for Sale in Key Biscayne, FL
The luxury market in Key Biscayne starts at $1,880,000 — about 1.5× the city’s median asking price. This page is every active listing at that level, refreshed nightly from the MLS, with what has actually closed, where the inventory sits and how long it takes to sell. For the wider picture see luxury communities in Miami-Dade County.
76 luxury homes are for sale in Key Biscayne, FL at $1,880,000 and up — median asking $5,434,000, the top listing at $237,000,000, $1,644 per square foot. 1% is new construction. Median days on market: 72.
Newest luxury listings in Key Biscayne
The most expensive homes for sale in Key Biscayne
| Listing | Asking | Sq ft | $ / sq ft | Community |
|---|---|---|---|---|
| 485 W Matheson Dr | $237,000,000 | 11,528 | $20,559 | tropical isle homes |
| 241 Cape Florida Dr | $27,900,000 | 9,159 | $3,046 | Cape Florida |
| 100 Cape Florida Dr | $19,800,000 | 8,240 | $2,403 | Cape Florida |
| 120 Knollwood Dr | $19,450,000 | 6,208 | $3,133 | Cape Fla |
| 550 Harbor Dr | $19,450,000 | 6,497 | $2,994 | hurricane cove |
| 445 Grand Bay Drive Ph-1A | $18,900,000 | 8,435 | $2,241 | GRAND BAY RESIDENCES Condo |
| 520 S Mashta Dr | $18,500,000 | 3,085 | $5,997 | Mashta Island A |
| 799 Crandon Blvd Ph-8 | $18,500,000 | 4,566 | $4,052 | OCEAN TOWER ONE Condo |
| 631 N Mashta Drive | $18,500,000 | 2,255 | $8,204 | Mashta Island |
| 350 Ocean Dr Lph2N | $17,900,000 | 4,764 | $3,757 | Oceana |
Where the luxury inventory is
| Community | Luxury listings | Median asking |
|---|---|---|
| Biscayne Key Estates | 10 | $5,692,500 |
| Oceana | 7 | $8,950,000 |
| CASA DEL MAR Condo | 7 | $3,500,000 |
| Cape Florida | 6 | $15,495,000 |
| Tropical Isle Homes | 5 | $6,900,000 |
| OCEAN TOWER ONE Condo | 3 | $5,490,000 |
| Mashta Island A | 2 | $12,425,000 |
| GRAND BAY RESIDENCES Condo | 2 | $11,425,000 |
| GRAND BAY TOWER Condo | 2 | $5,400,000 |
| Mashta Island | 2 | $17,650,000 |
| OCEAN TOWER TWO Condo | 2 | $3,444,500 |
| CLUB TOWER THREE Condo | 1 | $3,975,000 |
Luxury inventory by price
| Band | For sale | Share |
|---|---|---|
| $1,500,000–$2,000,000 | 1 | 1% |
| $2,000,000–$3,000,000 | 13 | 17% |
| $3,000,000–$5,000,000 | 21 | 28% |
| $5,000,000+ | 41 | 54% |
How to read this
Luxury is defined here as asking prices at or above $1,880,000. Counts, medians and closings come from active and closed MLS listings as of October 24, 2026; closings are the trailing 12 months. Listings appear courtesy of the listing brokerage under IDX rules; information deemed reliable but not guaranteed. See also all 83 homes for sale in Key Biscayne and what $1M buys across Miami-Dade County.