840 HARBOR DR, Key Biscayne, FL 33149

840 HARBOR DR, Key Biscayne, FL 33149 is a 6-bedroom, 7.5-bathroom residential - single family : 1 unit built in 1999 with 8,139 square feet of living space on a 20,437 square foot lot. The property is currently owned by THOMAS ROSS JOHNSON SABRINA M LUZURIAGA FRANSOLET, 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 2015-08-31 for $9,500,000, when 840 HARBOR LLC sold to THOMAS ROSS JOHNSON . There are 3 recorded sales for this property. The 2025 assessed value is $7,121,924 with a market value of $11,396,047.

This breaks down to $9,707,575 for the land and $1,688,472 for the building. The assessed value increased 3% from $6,921,209 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. 840 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 2013 to 2015, with 3 recorded transactions in the public record. The current assessed value represents 75% of the most recent sale price. Based on the most recent sale, this property traded at $1167 per square foot — a key metric for comparing value across Key Biscayne's real estate market..