BreakThru Realty

685 Harbor Lane, Key Biscayne, FL 33149

$6,950,000 · Active

  • 5 beds
  • 5.5 baths
  • 5,421 sq ft
  • 206 days on market
  • Single Family Residence
  • Built 2001
  • Lot 9,147.6 sq ft
  • 6,971 sq ft total
  • 1 garage space
  • Miami-Dade County
  • MLS# A11997896
  • Biscayne Key Estates
Photo 1 at 685 Harbor Lane, Key BiscaynePhoto 2 at 685 Harbor Lane, Key BiscaynePhoto 3 at 685 Harbor Lane, Key BiscaynePhoto 4 at 685 Harbor Lane, Key BiscaynePhoto 5 at 685 Harbor Lane, Key BiscaynePhoto 6 at 685 Harbor Lane, Key BiscaynePhoto 7 at 685 Harbor Lane, Key BiscaynePhoto 8 at 685 Harbor Lane, Key Biscayne

About this home

Set on one of the largest lots in Key Biscayne, a rare 12,200 sqft parcel, this colonial-style residence, known as Villa Rosa, was designed by renowned architect Cesar Molina and sits on a quiet, low-traffic street in a well-established, family-friendly neighborhood.The generous lot allows for a spacious backyard with pool and abundant green space, ideal for outdoor living and entertaining. Double balconies and covered terraces create a seamless indoor-outdoor flow throughout the home.This 5-bedroom residence offers bright interiors and a chefs kitchen with island, Sub-Zero refrigerator, wine cooler, double ovens, and two dishwashers. The primary suite includes a private terrace, oversized walk-in closet with safe, and dual baths with sauna. Also includes maids quarters and hurricane code construction.Minutes from the beach, parks, and top schools - a rare opportunity to own a well-designed home with an exceptional lot on one of Key Biscayne's most desirable streets.

Features

  • Bar
  • Entrance Foyer
  • Kitchen Island
  • Walk-In Closet(s)
  • Closet Cabinetry
  • Storage
  • Lighting
  • Balcony
  • In Ground

Schools

  • Elementary: Key Biscayne K-8
  • Middle: Ponce De Leon
  • High: Coral Gables

Presented by

BreakThru Realty · (786) 914-1017

Courtesy of

Avanti Way Realty LLC · brokersupport@avantiway.com · Listing agent: Marisela C Gonzalez Servat

BeachesMLS logo All listings featuring the BMLS logo are provided by BeachesMLS, Inc. This information is not verified for authenticity or accuracy and is not guaranteed. Copyright © 2026 BeachesMLS, Inc. IDX information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by BeachesMLS. Listings held by brokerage firms other than BreakThru Realty carry the name of the listing broker.

Schedule a showing

Call or text BreakThru Realty at (786) 914-1017 or email sales@breakthrurealty.com to see 685 Harbor Lane.

Before You Make an Offer

How buying a home in South Florida works

Your Buyer May Already Be Working With BreakThru Realty

Buyers come to BreakThru Realty searching for homes like this one, and many have shared their exact requirements with us: the neighborhood, the price, the bedrooms, the pool, the timing. If you own a home nearby and are weighing a sale, a broker can check it against those requirements before you list, and if no buyer on file fits, show you how we would reach the rest of the market.

BreakThru Realty works with hundreds of prequalified buyers searching for properties. Before you list, a broker reviews what you own, the market around it and whether an existing buyer's requirements match. If none does, you see how we would position it to reach other qualified buyers.

Find Out If We Have Your Buyer · Discuss Selling With BreakThru Realty

A potential match is a conversation, not an offer, until the buyer sees your property and makes one. No buyer is named and nothing about your property or business is shared until you decide to proceed.

Questions About 685 Harbor Lane

How much is 685 Harbor Lane?
685 Harbor Lane is listed at $6,950,000, which is about $1,282 per square foot. The listing page shows comparable active listings and recent closed sales nearby so you can judge the asking price against what buyers have actually paid.
What are the property taxes on 685 Harbor Lane?
The listing reports annual property taxes of $40,335 for 2025. Taxes are reassessed at the sale price after a purchase, so a new owner's bill can differ from the current owner's; use the mortgage calculator on this page for an estimate.
When was 685 Harbor Lane built?
685 Harbor Lane was built in 2001 and the listing describes its condition as resale. Age matters for insurance and financing in Florida: ask about the roof, the electrical panel and, for a condo built before the current code, the building's structural reserve study.
How long has 685 Harbor Lane been on the market?
685 Harbor Lane has been listed for 206 days. Days on market and price changes are the first signals of how much room there is to negotiate.
Which schools serve 685 Harbor Lane?
The MLS lists Key Biscayne K-8 (elementary), Ponce De Leon (middle), Coral Gables (high). School assignments are set by the district and can change; verify them with the school board before you rely on them.
How do I see 685 Harbor Lane?
Request a showing from this page or call BreakThru Realty and a licensed agent will arrange a private tour, in person or by video, and answer anything the listing leaves out.

To request a tour, call (786) 914-1017 or email sales@breakthrurealty.com.

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The 5 bedroom home at 335 W Enid Drive, Key Biscayne, FL 33149 is comparable and listed for sale at $6,897,000. Another comparable home, 760 Woodcrest Road, Key Biscayne, FL 33149, sold for $5,790,000 in October 2026. Other Key Biscayne neighborhoods include Cape Florida and Key Colony. Nearby ZIP codes include 33131 and 33129. This property also neighbors Brickell, Coconut Grove, and Miami. Compare it with the Key Biscayne housing market report.