BreakThru Realty

360 Harbor Lane, Key Biscayne, FL 33149

$9,950,000 · Active

  • 6 beds
  • 5.5 baths
  • 4,341 sq ft
  • 20 days on market
  • Single Family Residence
  • Built 2025
  • Lot 9,147.6 sq ft
  • 5,156 sq ft total
  • Miami-Dade County
  • MLS# A12104430
  • Biscayne Key Estates
Photo 1 at 360 Harbor Lane, Key BiscaynePhoto 2 at 360 Harbor Lane, Key BiscaynePhoto 3 at 360 Harbor Lane, Key BiscaynePhoto 4 at 360 Harbor Lane, Key BiscaynePhoto 5 at 360 Harbor Lane, Key BiscaynePhoto 6 at 360 Harbor Lane, Key BiscaynePhoto 7 at 360 Harbor Lane, Key BiscaynePhoto 8 at 360 Harbor Lane, Key Biscayne

About this home

Discreetly set in the heart of Key Biscayne — one of Miami’s most coveted island communities — this elegant modern two-story residence offers 5,156 SF of total space on a lush 9,300 SF lot with 6 bedrooms, 5.5 bathrooms, and a private office, perfectly balancing refined design with the relaxed island lifestyle. A travertine staircase entry and wrap-around porch with modern glass railings set a sophisticated tone, leading inside to soaring ceilings, herringbone oak floors by Listone Giordano, floor-to-ceiling sliding doors, and Lutron lighting. The open-concept living, dining, and family areas flow seamlessly to the outdoors. The chef’s kitchen showcases a striking fluted marble island with curved-edge countertops, floor-to-ceiling cabinetry by Design It, and a full Wolf and Sub-Zero appliance suite. The primary suite features a private terrace, dual custom walk-in closets, a dry sauna, and a show-stopping bath with aquamarine quartzite sourced from ARCA, dual Waterworks vanities, and a frameless glass shower. Outside, a covered terrace with fluted wood-paneled ceiling, summer kitchen with built-in grill and pizza oven, and a heated saltwater pool with marble deck and Baja ledge create the ultimate island retreat. Professionally designed landscaping and enchanting exterior uplighting illuminate the lush gardens, creating picturesque views through the home’s expansive glass walls, particularly after sunset. Integrated sound and four AC units complete this exceptional offering.

Features

  • Built-in Features
  • Entrance Foyer
  • High Ceilings
  • Other
  • Walk-In Closet(s)
  • Closet Cabinetry
  • Built-in Barbecue
  • Lighting
  • Balcony
  • Heated
  • In Ground

Schools

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

Presented by

BreakThru Realty · (786) 914-1017

Courtesy of

Coldwell Banker Realty · charlette.seidel@floridamoves.com · Listing agent: Judith H Zeder

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 360 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 360 Harbor Lane

How much is 360 Harbor Lane?
360 Harbor Lane is listed at $9,950,000, which is about $2,292 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 360 Harbor Lane?
The listing reports annual property taxes of $31,314 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 360 Harbor Lane built?
360 Harbor Lane was built in 2025 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 360 Harbor Lane been on the market?
360 Harbor Lane has been listed for 20 days. Days on market and price changes are the first signals of how much room there is to negotiate.
Which schools serve 360 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 360 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 6 bedroom home at 741 Harbor Drive, Key Biscayne, FL 33149 is comparable and listed for sale at $7,175,000. Another comparable home, 111 Reef Lane, Key Biscayne, FL 33149, sold for $10,850,000 in August 2026. Other Key Biscayne neighborhoods include Commodore Club and Ocean Club. 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.