4 Bedroom Homes for Sale in Key Biscayne, FL
Four bedrooms is the most-searched size in most Florida and Georgia markets. This page tracks every Key Biscayne listing whose MLS record reports four or more bedrooms, by community, with live counts and asking prices, and how the price compares with smaller homes in the same city.
57 homes with four or more bedrooms are for sale or pending in Key Biscayne, FL today across 23 communities. The median asking price is $6,950,000, from $2,600,000 to $237,000,000. Listings in Key Biscayne without that feature have a median of $1,399,000. Most listings right now: Biscayne Key Estates (11), Tropical Isle Homes Sub 4 (6), Cape Florida Sub Sec 3 (5). Updated October 2, 2026 from the MLS.
Live 4-bedroom homes in Key Biscayne: the listings
50 active listings match today (36% of Key Biscayne inventory), median asking $7,200,000, $1,926/sq ft, median 94 days on market. Photo cards link to the listing; refreshed nightly.
Newest 4-bedroom homes in Key Biscayne
The most expensive 4-bedroom homes in Key Biscayne
| Listing | Asking | Sq ft | Community |
|---|---|---|---|
| 485 W Matheson Dr | $237,000,000 | 11,528 | tropical isle homes |
| 241 Cape Florida Dr | $27,900,000 | 9,159 | Cape Florida |
| 200 Harbor Dr | $25,900,000 | 2,566 | Tropical Isle Homes |
| 120 Knollwood Dr | $19,950,000 | 6,208 | Cape Fla |
| 520 S Mashta Dr | $19,900,000 | 3,085 | Mashta Island A |
| 100 Cape Florida Dr | $19,800,000 | 8,240 | Cape Florida |
| 960 Mariner Dr | $19,500,000 | 7,742 | Cape Fla |
| 445 Grand Bay Drive Ph-1A | $18,900,000 | 8,435 | Grand Bay Residences Cond |
| 799 Crandon Blvd Ph-8 | $18,500,000 | 4,566 | OCEAN TOWER ONE Condo |
| 631 N Mashta Drive | $18,500,000 | 2,255 | Mashta Island |
4-Bedroom Homes by price
| Band | For sale | Share |
|---|---|---|
| $1M+ | 50 | 100% |
Key Biscayne 4-bedroom homes by community
Click a community for its full guide: prices, HOA reality, insurance posture and the homes for sale.
| Community | 4-Bedroom Homes | New build | Median list | From |
|---|---|---|---|---|
| Biscayne Key Estates | 11 | 0 | $5,600,000 | $3,800,000 |
| Tropical Isle Homes Sub 4 | 6 | 1 | $7,575,000 | $3,550,000 |
| Cape Florida Sub Sec 3 | 5 | 0 | $16,500,000 | $9,800,000 |
| Oceana Key Biscayne Condo | 3 | 0 | $11,495,000 | $8,950,000 |
| Tropical Isle Homes Sub | 3 | 0 | $7,490,000 | $5,995,000 |
| Ocean Tower One Condo | 3 | 0 | $5,490,000 | $3,975,000 |
| Cape Fla Sub Sec 2 | 2 | 1 | $19,725,000 | $19,500,000 |
| Mashta Island | 2 | 0 | $17,650,000 | $16,800,000 |
| Mashta Island A Replat Of | 2 | 0 | $13,125,000 | $6,350,000 |
| Grand Bay Residences Cond | 2 | 0 | $11,425,000 | $3,950,000 |
| Cape Florida Sub Sec 1 | 2 | 0 | $10,992,500 | $9,500,000 |
| Tropical Isle Homes Sub 3 | 2 | 0 | $6,720,000 | $5,990,000 |
| Club Tower Two Condo | 2 | 0 | $6,175,000 | $5,450,000 |
| Tropical Isle Homes Sub 1 | 2 | 0 | $5,207,500 | $3,730,000 |
| Tropical Isle Homes Resub | 1 | 0 | $237,000,000 | $237,000,000 |
| Hurricane Cove | 1 | 0 | $19,450,000 | $19,450,000 |
| Tropical Isle Homes Sub 2N | 1 | 0 | $7,950,000 | $7,950,000 |
| Holiday Colony | 1 | 0 | $6,490,000 | $6,490,000 |
| Grand Key Estates | 1 | 0 | $4,899,000 | $4,899,000 |
| Commodore Club South Cond | 1 | 0 | $4,500,000 | $4,500,000 |
| Grand Bay Tower Condo | 1 | 0 | $3,900,000 | $3,900,000 |
| Island House Apt Inc - Co | 1 | 0 | $3,750,000 | $3,750,000 |
| Gdns Of Key Bisc-Alhambra | 1 | 0 | $2,600,000 | $2,600,000 |
What the fourth bedroom costs
The answer block above compares the median asking price of four-plus-bedroom homes with the median of everything else listed in the city; the gap is what the extra room, and usually the extra square footage and lot, is priced at today. Compare on price per square foot, not price alone: a four-bedroom home at 2,000 square feet and one at 2,800 are different purchases, and the MLS square footage on each listing page makes that comparison in seconds. Newer subdivisions tend to deliver four bedrooms in less square footage than older ones; the community pages show year-built ranges so you can see which is which.
Questions to ask about any four-bedroom listing
Is the fourth bedroom a true bedroom with a closet and window, or a converted den, garage bay or bonus room? Are the bedrooms split (owner’s suite away from the others) or all on one side? Is there a second full bath near the secondary bedrooms? What does the seller pay for insurance and, in an HOA community, what do the dues cover? A local agent who works the area will know which builders’ four-bedroom plans hold their value.
Common questions
How many homes with four or more bedrooms are for sale in Key Biscayne?
What do 4-bedroom homes cost in Key Biscayne?
Which Key Biscayne community has the most 4-bedroom homes for sale?
How much more does a 4-bedroom home cost?
Keep exploring Key Biscayne
4-Bedroom Homes in nearby Miami-Dade County cities
- Miami 4-bedroom homes (1716 for sale)
- Homestead 4-bedroom homes (608 for sale)
- Miami Beach 4-bedroom homes (209 for sale)
- Doral 4-bedroom homes (154 for sale)
- Miami Gardens 4-bedroom homes (137 for sale)
- Hialeah 4-bedroom homes (123 for sale)
- Sunny Isles Beach 4-bedroom homes (114 for sale)
- Pinecrest 4-bedroom homes (113 for sale)
Live data: MIAMI REALTORS, refreshed with every MLS pull; this page rebuilds on every ship. Community-level aggregates only: active and pending residential listings in Key Biscayne, FL whose MLS record reports four or more bedrooms. Prices are asking prices, not values. Property features and prices only; nothing on this page describes residents. Equal Housing Opportunity.