521 S MASHTA DR, Key Biscayne, FL 33149

521 S MASHTA DR, Key Biscayne, FL 33149 is a 6-bedroom, 5.5-bathroom residential - single family : 1 unit built in 2012 with 5,845 square feet of living space on a 10,000 square foot lot. The property is currently owned by MAURICE R FERRE &W MARIA D FERRE, recorded as of 2026-04-19. The owner appears to be owner-occupied based on the mailing address matching the property address.

The most recent sale was on 2004-07-01 for $1,275,000. There are 3 recorded sales for this property. The 2025 assessed value is $3,618,420 with a market value of $4,944,161.

This breaks down to $3,100,000 for the land and $1,844,161 for the building. The assessed value increased 3% from $3,516,444 in 2024. The property has the following tax exemptions: homestead.

This property is located in FEMA Flood Zone AE, a Special Flood Hazard Area with a 1% annual chance of flooding (100-year floodplain). Flood insurance is typically required by lenders for properties in this zone. 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. 521 S MASHTA 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 1984 to 2004, with 3 recorded transactions in the public record. The current assessed value represents 284% 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 $218 per square foot — a key metric for comparing value across Key Biscayne's real estate market..