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Key Biscayne

Average List Price

$5,599,677

Average Price per Sqft

$1,565

Number of Active Listings

166

New Listings (last 30 days)

21

Average Days on the Market

142

Average Year Build

1983

Recent Transactions

Homes Sold (last 30 days)
11
Average Sale Price (last 30 days)
$2,610,284

Rental Market

Average Rent per month

$13,580

Virtual Tour
$237,000,000
485 Matheson Dr, Key Biscayne, FL, 33149
5
9
11,528 Sq ft
ACTIVE
MLS# A12005335

Listed by: Jill Eber; Coldwell Banker Realty; 305-915-2556; jille@jillszeder.com

Virtual Tour
$27,900,000
241 Cape Florida Dr, Key Biscayne, FL, 33149
8
9
9,159 Sq ft
ACTIVE
MLS# A12069861

Listed by: Rosa Nelly Minano; Cervera Real Estate Inc.; 305-793-6747; rosanellyminano@gmail.com

Virtual Tour
$19,950,000
120 Knollwood Dr, Key Biscayne, FL, 33149
6
7
6,208 Sq ft
ACTIVE
MLS# A12009875

Listed by: Francoise Teixier; Cervera Real Estate Inc.; 917-680-0912; fvlepleux@gmail.com

Virtual Tour
$19,900,000
520 Mashta Dr, Key Biscayne, FL, 33149
5
4
3,085 Sq ft
ACTIVE
MLS# A12071221

Listed by: Maureen Jauregui; Coldwell Banker Realty; 305-798-3124; carter.jauregui@gmail.com

Virtual Tour
$19,800,000
100 Cape Florida Dr, Key Biscayne, FL, 33149
4
9
8,240 Sq ft
ACTIVE
MLS# A11934196

Listed by: Lucia Marin; One Sotheby's International Realty; 786-325-6800; lamarin@onesothebysrealty.com

Virtual Tour
$19,450,000
550 Harbor Dr, Key Biscayne, FL, 33149
7
8
6,497 Sq ft
CONTRACT
MLS# A11912105

Listed by: William Earle; Three Bridges Realty, LLC; 305-345-2023; willearlybird@aol.com

$18,900,000
445 Grand Bay Drive UNIT PH-1A, Key Biscayne, FL, 33149
5
6
8,435 Sq ft
ACTIVE
MLS# A11954185

Listed by: Brigitte Nachtigall; One Sotheby's International Realty; 305-710-9664; Brigitte@bnachtigall.com

Virtual Tour
$18,500,000
799 Crandon Blvd UNIT PH-8, Key Biscayne, FL, 33149
5
6
4,566 Sq ft
ACTIVE
MLS# A12027629

Listed by: Natalia Anda; Coldwell Banker Realty; 305-298-2186; nataliaanda@msn.com

Virtual Tour
$18,500,000
631 Mashta, Key Biscayne, FL, 33149
4
5
2,255 Sq ft
ACTIVE
MLS# B26058354

Listed by: Javier Gustavo Quiroz; Coldwell Banker; 305-909-5940; javier.quiroz@cbrealty.com

Virtual Tour
$17,900,000
350 Ocean Dr UNIT LPH2N, Key Biscayne, FL, 33149
5
6
4,764 Sq ft
ACTIVE
MLS# A12027002

Listed by: Giulietta Ulloa; BHHS EWM Realty; 305-710-6620; giu@giuliettaulloa.com

Virtual Tour
$16,800,000
640 Mashta Dr, Key Biscayne, FL, 33149
4
4
3,620 Sq ft
ACTIVE
MLS# A11990382

Listed by: Brigitte De Langeron; DLS International Realty; 305-244-7493; brigitte@miamiwaterfront.com

Virtual Tour
$16,500,000
131 Cape Florida Dr, Key Biscayne, FL, 33149
6
7
7,103 Sq ft
ACTIVE
MLS# A12082460

Listed by: Lucas Boccheciampe; Vantage Real Estate LLC; 305-495-3865; lucas@vantageluxuryre.com

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Key Biscayne
MIAMI Association of REALTORS® is not responsible for the accuracy of the information listed above. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange Program and the South East Florida Regional MLS and is provided here for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Real estate listings held by brokerage firms other than the office owning this website are marked with the IDX logo and detailed information about them includes the name of the listing brokers. Data provided is deemed reliable but not guaranteed. Copyright MIAMI Association of REALTORS®, MLS All rights reserved. Updated: 16th October, 2026 1:11 PM (UTC)
Key Biscayne FL - Frequently Asked Questions

What buyers and sellers
ask about Key Biscayne.

Answers to the most common questions about buying and selling real estate in Key Biscayne, FL from InvesTeam Realty, serving this market for over 24 years.

What is the average home price in Key Biscayne FL?
+
Key Biscayne is a low-volume luxury market where monthly median figures fluctuate significantly based on a small number of transactions. Recent data shows median sale prices ranging from approximately $1.4M to $2.3M depending on period and property type. Active listings carry a median asking price around $2.62M as of April 2026, with average list prices significantly higher when ultra-luxury single-family homes are included. Single-family homes carry average list prices in the $10M range. Condos average list prices around $1.97M. Homes currently average 72 to 183 days on market and tend to sell at approximately 7% below list price.
What is Key Biscayne and what makes it distinct?
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Key Biscayne is a barrier island municipality approximately 4 miles from downtown Miami, accessible by the Rickenbacker Causeway. The island is bounded by Crandon Park to the north — one of Miami-Dade County's most visited parks — and Bill Baggs Cape Florida State Park to the south, which features a historic lighthouse and pristine beaches. The village has one public school rated 8 out of 10 by GreatSchools and access to private school options on the island. Key Biscayne has no through traffic, a strong pedestrian and cycling culture, and a significant international resident base. Its combination of island exclusivity and proximity to downtown Miami makes it one of the most distinctive residential addresses in South Florida.
What should buyers know about flood and insurance risk in Key Biscayne?
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Flood risk is a defining characteristic of Key Biscayne. Data shows that the vast majority of properties on the island carry significant flood risk over a 30-year horizon given its barrier island geography and low elevation. Florida flood insurance costs have increased substantially in recent years and must be treated as a material ongoing ownership cost, not an afterthought. Before making an offer, buyers should obtain an elevation certificate, confirm the FEMA flood zone designation for the specific property, and get flood and windstorm insurance quotes. Your InvesTeam Realty agent will identify the flood zone status and elevation certificate status of every property you seriously consider. Consult a licensed insurance professional and a real estate attorney before closing on any Key Biscayne property.
What should condo buyers in Key Biscayne know about the Florida structural inspection law?
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Florida Senate Bill 4D requires condominium buildings of three stories or more that are 30 years old or older to complete milestone structural inspections and Structural Integrity Reserve Studies. Key Biscayne has a number of condo buildings in scope of this law. Buildings with underfunded reserves or incomplete inspections may face special assessments or restrictions on unit sales. Before making an offer on any Key Biscayne condo, your agent will obtain and review the association's financial statements, reserve fund status, inspection reports, and any pending assessments. Consult a qualified real estate attorney before closing.
Is Key Biscayne a good place to invest in real estate?
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Key Biscayne benefits from its island geography, proximity to downtown Miami, and a supply constraint that limits new development. These factors have historically supported values particularly at the top end of the single-family market. The current environment gives buyers more leverage than in prior years. Flood and windstorm insurance costs are substantial and rising, and must be factored into total cost of ownership and any investment return analysis. The market is very low volume, which limits liquidity. Past performance does not guarantee future results — consult your agent, a financial advisor, and an insurance professional when evaluating any Key Biscayne property.
What public schools serve Key Biscayne FL?
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Key Biscayne is served by Miami-Dade County Public Schools and has one public school on the island rated 8 out of 10 by GreatSchools. Access to 3 private school options is also available on the island. School assignments are determined by property address and are subject to change - always verify zoning directly with Miami-Dade County Public Schools before making a purchase decision.
What are the closing costs for buyers in Key Biscayne?
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Key Biscayne is in Miami-Dade County. Buyers typically pay 2% to 5% of the purchase price in closing costs on a financed transaction. At Key Biscayne price points that represents a substantial dollar figure. Key costs include doc stamps on the mortgage at $0.35 per $100 of loan, intangible tax at 0.20% of the loan amount, and owner's title insurance paid by the buyer in Miami-Dade County. Flood and windstorm insurance must also be budgeted as a recurring ownership cost. Use our free Buyer Closing Costs Calculator on the InvesTeam Realty website. If purchasing from a foreign seller, FIRPTA withholding requirements apply - consult your closing agent and a qualified tax advisor.
What is FIRPTA and does it apply to Key Biscayne transactions?
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FIRPTA - the Foreign Investment in Real Property Tax Act - requires buyers to withhold up to 15% of the gross sales price when purchasing U.S. real estate from a foreign seller. Key Biscayne has a significant international resident base and FIRPTA applies regularly in this market. At Key Biscayne price points the withholding obligation can be very large. Buyers have a legal obligation to withhold and remit these funds to the IRS at closing unless a valid exemption applies. Both buyers and sellers should consult a qualified tax advisor and real estate attorney well in advance of closing.
Why choose InvesTeam Realty to buy or sell in Key Biscayne?
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InvesTeam Realty has been active in the South Florida luxury market for over 24 years with experience in Key Biscayne and the broader Miami-Dade island and waterfront corridor. Broker-Owner Reinaldo Gonzalez holds 16 NAR professional designations including the Certified International Property Specialist designation, directly relevant to Key Biscayne's significant international buyer and seller base. We serve all buyers and sellers equally in full compliance with federal and Florida fair housing laws. Equal Housing Opportunity.
Ready to buy or sell in Key Biscayne?
Talk to an InvesTeam Realty agent today. No pressure, no obligation.