Key Biscayne Real Estate Statistics 2026: 64 figures from MLS data

The median Key Biscayne house sold for $4,700,000 over June to August 2026, the trailing three months (11 sales; fewer than five closed in August 2026); the median Key Biscayne condo or townhouse sold for $1,500,000 in August 2026 (18 sales). On September 15, 2026 Key Biscayne had 35 houses for sale and 6 under contract and 111 condos and townhouses for sale and 17 under contract. This page collects 64 Key Biscayne housing statistics that PBP Real Estate computes from BeachesMLS listing data, each dated, with its window and sale count. Key Biscayne is a small market, so counts are shown monthly and medians widen to the trailing three or 12 months when fewer than five sales closed in the month. Houses and condos/townhouses are always reported separately. Edition 2026-09-15, frozen; a new edition is published each month.

Key Biscayne at a glance, edition 2026-09-15

Houses Condos and townhouses County

Of the 226 Key Biscayne sales that closed September 2025 to August 2026, 17% houses and 83% condos and townhouses.

Key takeaways: 11 Key Biscayne housing statistics to cite

1. The median Key Biscayne house sold for $4,700,000 over June to August 2026, the trailing three months (11 sales; fewer than five closed in August 2026); the trailing 12-month median is $4,437,500 (38 sales), +20.4% against the prior 12 months. Source: Key Biscayne real estate market page, June to August 2026 (trailing 3 months).
2. The median Key Biscayne condo or townhouse sold for $1,500,000 in August 2026 (18 sales); the trailing 12-month median is $1,400,000 (188 sales), +15.2% against the prior 12 months. Source: Key Biscayne real estate market page, August 2026.
3. 35 Key Biscayne houses were for sale on September 15, 2026 with 6 under contract; 6 came to market in August 2026, and at the trailing 12-month pace of 38 sales that is 11.1 months of supply. Source: Key Biscayne real estate market page, as of September 15, 2026.
4. 111 Key Biscayne condos and townhouses were for sale on September 15, 2026 with 17 under contract; 20 came to market in August 2026, and at the trailing 12-month pace of 188 sales that is 7.1 months of supply. Source: Key Biscayne real estate market page, as of September 15, 2026.
5. 28 Key Biscayne houses sold Jan 1 - Aug 31, 2026 against 27 in the same period of 2025, +3.7%. Source: Key Biscayne real estate market page, Jan 1 - Aug 31, 2026.
6. 145 Key Biscayne condos and townhouses sold Jan 1 - Aug 31, 2026 against 116 in the same period of 2025, +25.0%. Source: Key Biscayne real estate market page, Jan 1 - Aug 31, 2026.
7. Houses that sold in Key Biscayne took a median 96 days to go under contract (June to August 2026); houses still for sale have been listed a median 74 days. Source: Key Biscayne real estate market page, June to August 2026 (trailing 3 months).
8. Condos and townhouses that sold in Key Biscayne took a median 52 days to go under contract (August 2026); condos and townhouses still for sale have been listed a median 72 days. Source: Key Biscayne real estate market page, August 2026.
9. Of the 226 Key Biscayne sales that closed September 2025 to August 2026, 17% houses and 83% condos and townhouses. Source: Key Biscayne real estate market page, September 2025 to August 2026 (trailing 12 months).
10. Key Biscayne houses: median $4,700,000 (June to August 2026) against $680,000 across Miami-Dade County in August 2026; 11.1 months of Key Biscayne supply against 5.1 months county-wide. Source: Miami-Dade County market report, August 2026.
11. Key Biscayne condos and townhouses: median $1,500,000 (August 2026) against $410,000 across Miami-Dade County in August 2026; 7.1 months of Key Biscayne supply against 12.7 months county-wide. Source: Miami-Dade County market report, August 2026.

Each line above is written to be quoted as it stands. Cite "PBP Real Estate analysis of BeachesMLS listing data" and link to this page.

How many homes are for sale in Key Biscayne?

On September 15, 2026 Key Biscayne had 35 houses for sale and 6 under contract and 111 condos and townhouses for sale and 17 under contract. 6 houses came to market in August 2026. 20 condos and townhouses came to market in August 2026. At the trailing 12-month pace of 38 house sales (3.2 a month) the houses for sale represent 11.1 months of supply. At the trailing 12-month pace of 188 condo and townhouse sales (15.7 a month) the condos and townhouses for sale represent 7.1 months of supply. The median asking price of a Key Biscayne house for sale is $7,950,000 ($1,988 per sq ft). The median asking price of a Key Biscayne condo or townhouse for sale is $1,525,000 ($1,046 per sq ft). Source: Key Biscayne real estate market page.

How many homes sold in Key Biscayne?

3 Key Biscayne houses closed in August 2026 (1 in August 2025); 28 sold Jan 1 - Aug 31, 2026 against 27 a year earlier, +3.7%. 18 Key Biscayne condos and townhouses closed in August 2026 (18 in August 2025); 145 sold Jan 1 - Aug 31, 2026 against 116 a year earlier, +25.0%. Over September 2025 to August 2026, 38 houses sold against 40 in the 12 months before (-5.0%). Over September 2025 to August 2026, 188 condos and townhouses sold against 164 in the 12 months before (+14.6%). Counts are exact at any size; percentage changes are shown only where both periods had at least five sales. Source: Key Biscayne real estate market page.

What is the median home price in Key Biscayne?

Medians on this page use the shortest window with at least five sales: the latest complete month (August 2026), then the trailing three months (June to August 2026), then the trailing 12 months (September 2025 to August 2026). Every median names its window and sale count. Counts are always monthly.

The median Key Biscayne house sold for $4,700,000 over June to August 2026, the trailing three months (11 sales; fewer than five closed in August 2026). Over September 2025 to August 2026 the median was $4,437,500 (38 sales) against $3,684,750 in the 12 months before (40 sales), +20.4%. Per square foot, houses sold at a median $1,588 per sq ft and at 90.0% of final asking price (June to August 2026).

The median Key Biscayne condo or townhouse sold for $1,500,000 in August 2026 (18 sales). Over September 2025 to August 2026 the median was $1,400,000 (188 sales) against $1,215,000 in the 12 months before (164 sales), +15.2%. Per square foot, condos and townhouses sold at a median $930 per sq ft and at 96.0% of final asking price (August 2026).

Monthly and trailing medians compare different homes, not repeat sales of the same home, so moves between windows partly reflect what happened to sell. Source: Key Biscayne real estate market page.

How long does it take to sell a home in Key Biscayne?

Houses that sold in Key Biscayne took a median 96 days to go under contract (June to August 2026 (trailing 3 months)). Over September 2025 to August 2026 the median was 92 days. Houses still for sale on September 15, 2026 had been listed a median 74 days; the sold figure is shorter because homes that sell quickly leave the for-sale pool.

Condos and townhouses that sold in Key Biscayne took a median 52 days to go under contract (August 2026). Over September 2025 to August 2026 the median was 60 days. Condos and townhouses still for sale on September 15, 2026 had been listed a median 72 days; the sold figure is shorter because homes that sell quickly leave the for-sale pool.

How does Key Biscayne compare with Miami-Dade County?

Key Biscayne houses sold for a median $4,700,000 (June to August 2026) against $680,000 across Miami-Dade County in August 2026; Key Biscayne condos and townhouses sold for a median $1,500,000 (August 2026) against $410,000 across Miami-Dade County in August 2026. Key Biscayne carries 11.1 months of houses supply on trailing absorption against the county's 5.1 months on last month's sales. Key Biscayne carries 7.1 months of condos and townhouses supply on trailing absorption against the county's 12.7 months on last month's sales. The windows differ because Key Biscayne is small and the county is not; the comparison is a bearing, not a like-for-like month. Source: Miami-Dade County market report.

What these statistics mean if you are selling in Key Biscayne

In a market of 226 sales a year, one asking price that misses the market is visible to every buyer's agent working Key Biscayne. Houses still for sale have been listed a median 74 days against 96 days for the houses that sold (June to August 2026). Condos and townhouses still for sale have been listed a median 72 days against 52 days for the condos and townhouses that sold (August 2026). The useful question before listing is not what the highest number is that the market might accept, but what first asking price sells inside the sold-homes clock rather than the for-sale clock. That is the question a comparative market analysis from PBP Real Estate answers, house by house, from the same closed-sale record used here.

All 64 statistics in this edition

Every figure on this page grouped by section, with its type, value, period and sale count where a median is involved. The same table is downloadable as CSV below.

Inventory and supply (14 statistics)

Sales counts (20 statistics)

Prices and time on market, houses (11 statistics)

Prices and time on market, condos and townhouses (11 statistics)

Property mix (2 statistics)

County context (6 statistics)

Method, source, corrections and download

• Source data: BeachesMLS listings permitted for internet display, delivered through Cotality Trestle (PBP connection 23039), for listings whose MLS city field is Key Biscayne. Listings whose sellers declined internet display are absent and their number is unknown, so no figure is a census; newly listed counts are floors for the same reason.
• Property type follows the tax legal description: a condominium regime in the legal makes the property a condo whatever the MLS type; townhouses and villas are reported with condos. Houses and condos/townhouses are never combined into one figure. The property-mix shares are shares of a count, not blended prices.
• Small-market rule: counts (sales, listings, homes under contract, newly listed) are always reported for the month. Medians are reported over the shortest of the latest complete month, the trailing three months or the trailing 12 months that contains at least five sales, and the window and sale count are printed beside each median. Months of supply divide homes for sale by the trailing 12-month average of monthly sales. Nothing is estimated or modeled.
• Each statistic carries its own data date. Inventory, contract and asking-price figures are the September 15, 2026 snapshot; the latest complete month is August 2026; Miami-Dade County context comes from the county market report dated September 15, 2026.
• This is the 2026-09-15 edition and it is frozen. A new edition is published each month; earlier editions remain downloadable. Published-figure errors are logged at the corrections log.
• Download: 2026-09-15.csv (CSV, this edition, one row per statistic) or the latest edition. Listing-level records are MLS data and are not redistributed.
• Free to cite with attribution to "PBP Real Estate analysis of BeachesMLS listing data" and a link. Questions or a request for a figure not shown here: info@pbpre.com or 561-395-8418.

Related: the Key Biscayne real estate market page, Miami-Dade County real estate statistics, the Miami-Dade County market report and, across all five counties, South Florida homes listed below their purchase price.

Real estate statistics for other South Florida cities

Same feed, same property-type rule, one page per city 88 other city editions across 5 counties, listed by county below. The index of every city edition is at South Florida real estate statistics by city.

Palm Beach County

Atlantis, Boca Raton, Boynton Beach, Delray Beach, Greenacres, Gulf Stream, Highland Beach, Hypoluxo, Juno Beach, Jupiter, Lake Clarke Shores, Lake Park, Lake Worth Beach, Lantana, Loxahatchee, Manalapan, North Palm Beach, Ocean Ridge, Palm Beach, Palm Beach Gardens, Palm Beach Shores, Palm Springs, Riviera Beach, Royal Palm Beach, South Palm Beach, Tequesta, Wellington, West Palm Beach, Westlake.

Broward County

Coconut Creek, Cooper City, Coral Springs, Dania Beach, Davie, Deerfield Beach, Fort Lauderdale, Hallandale Beach, Hillsboro Beach, Hollywood, Lauderdale Lakes, Lauderdale-by-the-Sea, Lauderhill, Lighthouse Point, Margate, Miramar, North Lauderdale, Oakland Park, Parkland, Pembroke Pines, Plantation, Pompano Beach, Sunrise, Tamarac, Weston, Wilton Manors.

Miami-Dade County

Aventura, Bal Harbour, Bay Harbor Islands, Biscayne Park, Coconut Grove, Coral Gables, Cutler Bay, Doral, Florida City, Hialeah, Hialeah Gardens, Homestead, Miami, Miami Beach, Miami Gardens, Miami Lakes, Miami Shores, Miami Springs, North Bay Village, North Miami, North Miami Beach, Opa Locka, Palmetto Bay, Pinecrest, South Miami, Sunny Isles Beach, Surfside.

Martin County

Hobe Sound, Jensen Beach, Palm City, Stuart.

St. Lucie County

Fort Pierce, Port St. Lucie.

BeachesMLS listings permitted for internet display, analyzed by PBP Real Estate. This data is not verified for authenticity or accuracy and may not reflect all real estate activity in the market. Based on information (c) 2026 BeachesMLS, Inc.