524 Warren Ln

Key Biscayne, FL 33149

$3,730,000

$1,381/ft²

5Beds

4Baths

2,700Sq ft

1950Year built

Single-family homeType

About this home

Located in one of the most exclusive residential pockets of Key Biscayne, surrounded by multi-million-dollar estates, this beautifully designed 5-bedroom, 4 full bathroom home offers the perfect balance of privacy, functionality, and tropical lifestyle. The layout is thoughtfully distributed with a private primary suite on one side, a separate nanny/guest suite with its own bathroom, and a dedicated wing for the children’s bedrooms—ideal for both family living and entertaining. Just steps from top-rated schools and only 10 minutes from the beach, the property features a stunning outdoor space with a resort-style pool and a charming tiki bar, creating the ultimate South Florida oasis. A rare opportunity to own in a highly sought-after neighborhood where surrounding homes reach $10M+.

Property details

Listing

MLS #: A11999112
Status: For sale
Listed on: Apr 10, 2026
Days on market: 139 days
Listing data updated: Aug 17, 2026

Interior

Beds: 5
Baths: 4
Living area: 2,700 ft²
Price per ft²: $1,381/ft²

Building & community

Type: Single-family home
Year built: 1950
County: Miami-Dade

Lot & exterior

Lot size: 8,136 ft²

Days on market, price per ft² and the monthly HOA amount are calculated by this site from the MLS data shown; the association fee is normalized to a monthly figure.

What's nearby

Elementary school: KEY BISCAYNE K-8 CENTER · 0.2 mi away
Middle school: KEY BISCAYNE K-8 CENTER · 0.2 mi away
High school: MAST ACADEMY · 3.2 mi away
Transit: CRANDON BD & MCINTYRE ST · 0.3 mi away
Supermarket: Winn-Dixie · 0.3 mi away
Park: Hampton Park · 0.2 mi away
Pharmacy: CVS Pharmacy · 0.4 mi away

Straight-line distances · Sources: NCES/FL DOE, GTFS Miami-Dade and Broward, OpenStreetMap

True monthly cost

Mortgage (principal & interest): $18,861
Property taxes (est.): $3,419
Home insurance (est.): $2,798
Flood insurance (est.): —

Estimated total$25,078*/mo

* Some cost lines aren't available yet for this listing; the total shown is incomplete.

Based on 20% down, a 6.5% rate and a 30-year loan, plus this home's estimated Florida carrying costs. All figures are illustrative estimates — not quotes, not financial or insurance advice.

Sources: flood zone — FEMA National Flood Hazard Layer; mortgage, taxes and insurance figures — this site's own estimates; HOA / CDD — as reported for this listing.

What will this home really cost you?