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New Construction Homes in Key Biscayne, FL

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Before you start looking
The buying timeline

Afford it

Today's mortgage rates
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Review official public-safety information for any area from these government sources:

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2 listings

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Buy before you sell

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New construction

New Construction Homes in Key Biscayne, FL

New Construction Homes in Key Biscayne, FL

2 Listings

New Construction Homes in Key Biscayne, FL

2 Listings

Your Key Biscayne agent

JA

Jonathan Alfonso

Portal Real Estate

Lic. #3306632

Portal Real Estate

24Active
$6,900,000
6 bd · 7 ba · 3,550 sqft
110 Hampton Ln, Key Biscayne, FL
Jacqueline Molina · Fortune Christie's Intl R.E.
Price Reduced79Active
$19,500,000
6 bd · 10 ba · 7,742 sqft
960 Mariner Dr, Key Biscayne, FL
Francisco Neri · The Corcoran Group

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L. Custen Realty, Inc. d/b/a Realty.com/L. Custen Realty CT, LLC d/b/a Realty.com (Tom O’Leary-Broker)(CT properties only), 8323 Southwest Freeway, Suite 900, Houston, Texas 77074

The information provided by this website is for the personal, non-commercial use of consumers and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Listing data is derived from various Multiple Listing Services; each source MLS and its required disclaimer are shown with the listings on the applicable page. Realty.com is an independently owned and operated brokerage.

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MIAMI REALTORS MLS: The multiple listing information is provided by MIAMI Association of Realtors® from a copyrighted compilation of listings. The compilation of listings and each individual listingare ©2026 MIAMI Association of Realtors®. All Rights Reserved.
The information provided is for consumers’ personal, noncommercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified. Last Updated: 2026-08-26 22:32:31 UTC

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Your Key Biscayne agent

JA

Jonathan Alfonso

Portal Real Estate

Lic. #3306632

Portal Real Estate

Key Biscayne, FL community profile

Population: 15,327
Median income: $154,457
Housing units: 7,079
People per sq. mi.: 982.5
Area: 15.6 sq. mi.

Source: HJN community data

Key Biscayne housing market

June 2026

Selling at 94.0% of asking price

Buyers here are paying below asking. MLS · 30 sales · as of Jun 30, 2026

Homes that sold · County records, as of Jun 30, 2026

Median sale price: $1,390,000$843,750–$2,350,000 typical range
Price per sq. ft.: $858
Sales: 28
Paid in cash: 71.4%

Homes on the market · MLS, as of Jun 30, 2026

Median days on market: 31 days

Price trend · Assessor repeat sales, as of Jun 30, 2026

Year-over-year: 3.7%