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421 S Mashta Drive, Key Biscayne, FL 33149

Single family property built in 1980 with 4,569 sq ft of living area on a 0.42-acre lot in Key Biscayne, Miami-Dade County. Facts below come from the county property appraiser's public record.

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County just value (tax roll) — not a market value
$9,374,379
County assessed value (tax roll)
$4,240,639
Living area
4,569 sq ft
Lot size
0.42 acres (18,418 sq ft)
Year built
1980
Land use
Single family
FEMA flood zone
Not on file yet
County
Miami-Dade County, FL
Parcel ID
fl-23-2452050170130

At a glance

Who owns 421 S Mashta Dr?
Miami-Dade County property records list MIGUEL A SILVA as the owner of record.
What is the county just value of 421 S Mashta Dr?
$9,374,379 on the Miami-Dade County tax roll (as of January 1). Just value is the property appraiser's figure for property taxes — not a market value.
What is the parcel ID?
fl-23-2452050170130 (Miami-Dade County).

Current owner

Owner contact info

Phones, emails and mailing addresses from public Florida records are available to members.

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More on S Mashta Dr

All 46 properties on S Mashta Dr · ZIP 33149 (Key Biscayne). Values are county just values (tax roll), not market values.

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Source: Florida Department of Revenue parcel roll; data refreshed Jun 25, 2026. Values are county tax-roll figures, not appraisals. How to read these values · Data sources