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ActiveMLS listing sourceMIAMI REALTORS® MLS
ActiveMLS® A12104430
$9,950,000

360 Harbor Lane, Key Biscayne, FL 33149

Beds
6
Baths
6
Sqft
4,341
Est. payment$59,213/mo
Home type
Single Family Residence
Year built
2025
Lot size
9,148 sqft
Price / sqft
$2,292
HOA
$0/mo
Community
BISCAYNE KEY ESTATES

Property description

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.

Listing activity

Days on market
6
Listed
Oct 19, 2026
MLS listing updated
Oct 23, 2026
Feed last checked
Just now

Listed by Judith H Zeder · Coldwell Banker Realty

Map

Map location is based on MLS-supplied coordinates. Verify the location before relying on it.

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms
6
Bathrooms
6
Bathrooms (decimal)
5.5
Full bathrooms
5
Half bathrooms
1

Rooms & features

Rooms
5
Interior features
Built-in Features, Closet Cabinetry, Entrance Foyer, High Ceilings, Walk-In Closet(s), Other
Flooring
Marble, Wood
Appliances
Dishwasher, Disposal, Dryer, Electric Range, Microwave, Oven, Refrigerator, Washer, Water Purifier, Other
Furnished
Unfurnished
Window features
Blinds
Other equipment
Other

Heating & cooling

Heating
Central, Electric
Cooling
Central Air, Electric
Property

Parking

Garage spaces
0
Carport spaces
2
Carport
Yes
Covered spaces
2
Parking features
Attached Carport, Carport, Driveway, Paver Block
Attached garage
No

Exterior

Stories
2
Building area
5,156 sqft
Entry level
1
Patio & porch
Deck
Exterior features
Balcony, Built-in Barbecue, Lighting
Pool
Yes
Pool features
Heated, In Ground
View
Garden, Pool
Waterfront property
No

Lot

Lot size
9,148 sqft
Lot size (acres)
0.21 acres
Lot dimensions
9300
Zoning
0100
Construction

Type & style

Home type
Single Family Residence
Architectural style
Contemporary
Year built
2025
New construction
No

Materials

Construction
Block, Other
Roof
Flat, Tile
Property condition
Resale
Levels
Two
Faces
Northeast
Utilities & green energy

Utilities

Sewer
Public Sewer
Water
Public
Community & HOA

Community

Subdivision
BISCAYNE KEY ESTATES
MLS area
2520
Pets allowed
Yes
55+ community
No

Association

Has association
No
Estimated monthly dues
$0
Amenities
None
Lease details

Not reported by the listing source.

Location

Area details

City
Key Biscayne
County
Miami-Dade
ZIP code
33149
Manufactured home details

Not reported by the listing source.

Financial & listing details

Listing

MLS number
A12104430
Possession
Negotiable
Original list price
$9,950,000
Parcel number
2452050011490
Annual property tax
$31,314
Tax year
2025
Tax legal description
5 & 6 55 42 BISCAYNE KEY ESTS PB 50-61 LOT 3 BLK 10 LOT SIZE 8000 SQ FT OR 12488-3411 0485 4 COC 24947-2228 09 2006 5
Additional MLS details

Reported by the listing source

Association Amenities
None
Association
No
Bathrooms Total Decimal
5.5
Bathrooms Total Integer
6
Building Area Total
5156
Construction Materials
Block, Other
County Or Parish
Miami-Dade
Days On Market
6
Direction Faces
Northeast
Elementary School
Key Biscayne K-8
High School
Coral Gables
List Price
9950000
Listing Contract Date
2026-10-19
Living Area
4341
Lot Size Acres
0.21
Lot Size Area
9300
Lot Size Dimensions
9300
MLSArea Major
2520
Middle Or Junior School
Ponce De Leon
Mls Status
Active
On Market Date
2026-10-19
Patio And Porch Features
Deck
Photos Count
16
Postal Code
33149
Property Sub Type
Single Family Residence
Property Type
Residential
Rooms Total
5
Senior Community
No
Standard Status
Active
State Or Province
FL
Status Change Timestamp
2026-10-19T04:00:00Z
Stories Total
2
Subdivision Name
BISCAYNE KEY ESTATES
Water Source
Public
Tax Annual Amount
31314
Bathrooms Full
5
Pool Private
Yes
Bedrooms Total
6
Waterfront
No
Bathrooms Half
1

Market value

Automated estimate—No licensed valuation source connected
Estimated sales range—Ask Karim for a local market analysis
Estimated rent—No licensed rental valuation source connected

Price history

DateEventPrice
Oct 19, 2026ListedMIAMI REALTORS® MLS$9,950,000$2,292/sqft

Public tax history

YearProperty taxesAssessment
2025$31,314—

Payment calculator

Estimated monthly payment$59,213/moIllustrative estimate, not a loan offer.
Principal & interest
$51,628
Property taxes
$2,610
Insurance
$4,975
Association dues
$0

Live national rate context is displayed below through Mortgage News Daily’s official widget. The calculator rate remains a separate assumption until licensed machine-readable access is connected. This is not a loan offer.

Neighborhood

Area

BISCAYNE KEY ESTATES

Key Biscayne · Miami-Dade County · 33149

Climate risk

—

No licensed climate-risk source is connected.

Nearby schools

Key Biscayne K-8Elementary
—
Ponce De LeonMiddle
—
Coral GablesHigh
—
School names and districts are MLS-reported when available. Verify attendance boundaries with the school district. Ratings require a licensed ratings provider.

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MLS listing source

MIAMI REALTORS® MLS · Listing courtesy of Coldwell Banker Realty. 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 be used only to identify prospective properties they may be interested in purchasing or leasing. Terms of use · Equal Housing Opportunity.