1040 MARINER DR, Key Biscayne, FL 33149

1040 MARINER DR, Key Biscayne, FL 33149 is a 3-bedroom, 3-bathroom residential - single family : 1 unit built in 1971 with 3,552 square feet of living space on a 14,070 square foot lot. The property is currently owned by HAUMONIA KB LLC, recorded as of 2026-03-29. The owner appears to be owner-occupied based on the mailing address matching the property address.

The most recent sale was on 2012-06-15 for $4,100,000, when GABRIEL GUSTAVO MORENO & sold to HAUMONIA KB LLC. There are 3 recorded sales for this property. The 2025 assessed value is $5,723,688 with a market value of $7,285,463.

This breaks down to $6,683,250 for the land and $602,213 for the building. The assessed value increased 10% from $5,203,353 in 2024. 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. 1040 MARINER 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 1992 to 2012, with 3 recorded transactions in the public record. The current assessed value represents 140% 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 $1154 per square foot — a key metric for comparing value across Key Biscayne's real estate market..