631 N Mashta Dr
Key Biscayne, FL 33149
$18,500,000Active · confirmed September 18, 2026 · listed 55 days ago · $8,204/sq ft
631 N Mashta Dr in Key Biscayne. 4 bed, 4.5 bath, 2,255 sq ft. Asking $18,500,000. Active listing facts, schools and neighborhood context on EuKreate.
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631 N Mashta Dr, Key Biscayne, FL 33149 and what is around it
Listed by Coldwell Banker Realty · Javier G Quiroz · MLS B26058354 · as of 2026-09-18
Beds
4
Baths
4.5
Sq ft
2,255
Built
1958
Property typeSingle Family
Lot size14,810 sq ft · 0.34 acres
Price per sq ftPrice per square footThe asking price divided by the home’s interior square footage. Compare it only with broadly similar homes; condition, lot, layout, and fees still matter.$8,204
ListedJul 30, 2026
CountyMiami-Dade
Listing typesale
Property summary
This 4-bedroom, 4.5-bath single family offers 2,255 sq ft.
Refined from listing-reported details
Listed by Coldwell Banker Realty · Javier G Quiroz · MLS B26058354 · as of 2026-09-18
How this compares in Key Biscayne
136 homes for sale, median asking $2,350,000, typically listed 96 days. See the Key Biscayne market
Active asking price only, not a sold price and not an appraisal. Check official sources before acting. Listing facts as of September 18, 2026.