Key Biscayne · micromarket · 12 months · data as of October 19, 2026
Key Biscayne Waterfront Homes Market Report
Closed sales from October 1, 2025 to September 30, 2026 · MIAMI REALTORS® MLS data as of October 19, 2026 · reviewed by Julian Acosta · next report January 2027
Where Waterfront Homes Are
Waterfront Homes are Key Biscayne's houses whose lot touches the water: 215 of the Village's 1,290. 107 are in the Cape Florida subdivision, most of them on its canals, 54 on Mashta Island, and 54 on the bay side of the main island, along Harbor Drive, Harbor Point and West Matheson Drive. By the water they face, 97 are on a canal, 63 on a cove or basin and 55 on open bay; no house lot reaches the Atlantic. The median house has about 5,900 SF, built in 1989, on a lot of about 16,500 SF, and 24 were built since 2015 (Miami-Dade County Property Appraiser, 2026 record, read October 26, 2026).
Key takeaways
- Key Biscayne's waterfront houses closed 4 sales in the 12 months to September 2026, too few for a median. See the full reading
- In the 12 months to September 2025, 5 Key Biscayne waterfront houses sold at a median of $13,800,000. See the full reading
- Key Biscayne has 215 houses on the water, in three neighborhoods: Cape Florida, Mashta Island and the bay lots of the main island. See the full reading
Where the market in Key Biscayne's waterfront homes is heading
- Key Biscayne's waterfront houses closed 4 sales in the 12 months to September 2026, against 5 a year earlier.
These are the figures to date, not a forecast.
If you're selling in Key Biscayne's waterfront homes
- Few sales a year: 4 Key Biscayne waterfront houses closed in the 12 months to September 2026, out of 215.
If you're buying in Key Biscayne's waterfront homes
- Where they stand: of Key Biscayne's 215 waterfront houses, 107 are in Cape Florida, 54 on Mashta Island and 54 on the bay lots of the main island (Miami-Dade County Property Appraiser, 2026 record).
Waterfront Homes in figures
Data as of October 19, 2026
Waterfront Homes Single-Family Home Prices
4 sales · 12 months to September 2026Median sale price · single-family
4 sales, too few for a median
A year earlier: 5 sales at $13,800,000
Only 4 houses sold in Waterfront Homes in the 12 months to September 30, 2026: too few for a fair median, so each sale is listed in the table below (MIAMI REALTORS® MLS).
12 months · 4 sales · MIAMI REALTORS® MLS
Closed sales
4
A year earlier: 5
4 houses sold in Waterfront Homes in the 12 months to September 30, 2026, fewer than one a month, against 5 the 12 months before (MIAMI REALTORS® MLS).
12 months · 4 sales · MIAMI REALTORS® MLS
Condos · none sold
Townhouses · none sold
On the water and off it in Waterfront Homes
12 monthsHouses on the water
4 sales, too few for a median
4 sales
The listing's MLS mark
Key Biscayne Waterfront Homes by Neighborhood
Waterfront Homes by the County's plats, the way the report files its sales, each neighborhood with its house sales in the twelve months to September 30, 2026; a neighborhood has its row from five sales.
| Neighborhood | Sales | Median price | Days (median) |
|---|
Mashta Island closed one house in these twelve months: too few for a median.
Cape Florida closed one house in these twelve months: too few for a median.
The bay lots of the main island closed 2 houses in these twelve months: too few for a median.
What is my home worth?
Enter your address. The page finds your home in the public record and reads the closed sales nearest it.
An estimate by Julian Acosta from MLS closed sales and the Miami-Dade County record; not an appraisal. How it works →
Would you rather have Julian do it for you? He answers within one business day. Write to Julian →
Waterfront Homes versus the other areas of Key Biscayne
| Area | Houses: median price | Houses: sales | Houses: days (median) | Condos: median price |
|---|---|---|---|---|
| Waterfront Homes | — | 4 | — | — |
| Homes Off the Water → | $4,160,000 | 34 | 88.5 | — |
| Key Colony and Ocean Lane → | — | 2 | — | $1,140,000 |
| Grand Bay and Ocean Drive → | — | 0 | — | $754,500 |
| Ocean Club and South Crandon → | — | 0 | — | $2,100,000 |
| Key Biscayne, all its areas → | $4,537,500 | 40 | 94.5 | $1,400,000 |