850 HARBOR DR, Key Biscayne, FL 33149

850 HARBOR DR, Key Biscayne, FL 33149 is a 7-bedroom, 7.5-bathroom residential - single family : 1 unit built in 2011 with 6,949 square feet of living space on a 17,800 square foot lot. The property is currently owned by JAMES SAMMATARO CRISTINA SAMMATARO, 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 2010-08-30 for $3,300,000, when SANWOOD FLA INC sold to JAMES SAMMATARO. The property has appreciated $1,150,000 (53%) since the prior sale of $2,150,000 on 2003-06-01. There are 3 recorded sales for this property.

The 2025 assessed value is $6,548,295 with a market value of $10,649,445. This breaks down to $8,455,000 for the land and $2,194,445 for the building. The assessed value increased 3% from $6,363,747 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. There are active mortgage liens totaling $1,008,982 recorded against this property.

850 HARBOR 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 2002 to 2010, with 3 recorded transactions in the public record.

The current assessed value represents 198% 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 $475 per square foot — a key metric for comparing value across Key Biscayne's real estate market..