270 ISLAND DR, Key Biscayne, FL 33149

270 ISLAND DR, Key Biscayne, FL 33149 is a 4-bedroom, 3-bathroom residential - single family : 1 unit built in 1964 with 3,661 square feet of living space on a 14,100 square foot lot. The property is currently owned by JUAN C MERCENARI, recorded as of 2026-03-29. The mailing address differs from the property address, suggesting this may be an investment property or rental.

The most recent sale was on 2012-05-17 for $3,250,000, when HELMUT BRACKE &W ELSBETH sold to JUAN C MERCENARI. The property has appreciated $3,062,500 (1633%) since the prior sale of $187,500 on 1976-03-01. The 2025 assessed value is $4,488,944 with a market value of $7,407,378.

This breaks down to $6,697,500 for the land and $709,878 for the building. The assessed value increased 3% from $4,362,434 in 2024. The property has the following tax exemptions: homestead.

The median household income in this area is $250,001, and the median home value is $2,000,001. The population density is 3,407 people per square mile. 270 ISLAND DR, Key Biscayne, FL 33149 is located in Key Biscayne, Florida.

Property records, tax assessments, sales history, and ownership information for this Key Biscayne property are sourced from miami_dade County public records. The complete ownership history of this property spans from 1976 to 2012, with 2 recorded transactions in the public record. The current assessed value represents 138% of the most recent sale price.

This high ratio could indicate the property was purchased below market value — a potential sign of a distressed sale or off-market deal. Based on the most recent sale, this property traded at $888 per square foot — a key metric for comparing value across Key Biscayne's real estate market..