Nina Mormina - Preferred Properties Int'l Realty, Inc Logo
$19,900,000
 $106,828 est/mo Sourced by Back At You

520 S Mashta Drive,Key Biscayne, FL 33149

Key Biscayne, FL 33149

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Description

Seize a rare opportunity to create a landmark waterfront estate on one of the largest residential lots in Key Biscayne's exclusive Mashta Island enclave. Spanning an extraordinary 22,140 square feet, this exceptional property offers 138 feet of pristine water frontage and sweeping open water views, providing an unparalleled setting for a world class residence.Plans by renowned architect, Pablo Corazzini of Vitalini Corazzini Architects, are available to the buyer, offering a thoughtfully conceived vision that takes full advantage of the property's remarkable scale, premier waterfront setting, and spectacular sunsets. The proposed design creates an extraordinary canvas for sophisticated indoor-outdoor living and entertaining, should the buyer choose to pursue the concept.With its exceptional lot size, expansive water frontage, and coveted Mashta Island address, this is a truly irreplaceable opportunity to create a legacy estate in one of South Florida's most prestigious waterfront communities.

Details

MLS #A12071221
Listing TypeFor Sale
StyleHouse
Sub-TypeResale
StatusActive
Year1961
Days On Site49
Listing Provided ByColdwell Banker Realty | Maureen Jauregui

Features

Bed(s)5
Bath(s) 4 Total
SQ Feet3,085
Garage2
PoolYes
Story(s)1
Zoning2001
Acreage0.51
Water FrontYes
Property ViewYes

Parking

Garage Yes / NoYes
Parking FeaturesDriveway

Taxes

Tax Annual Amount201741

Area Information

StateFL
CountyMiami Dade
CityKey Biscayne
Zip Code33149
Area2520
Community NameMASHTA ISLAND A REPLAT OF
Listing VS Median (in MASHTA ISLAND A REPLAT OF)
Price:
$19,900,000
low | high
Med:
$3,190,750
100% of Average
sqft:
3,085
low | high
Med:
2,982
53.354943273906% of Average
$ / sqft:
$6,451
low | high
Med:
$1,155
100% of Average
On site:
49
low | high
Med:
55.5
88.288288288288% of Average
Sourced by Back At You

Market Activity 33149

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Learn More About This Property

Nina Mormina

Nina Mormina

Preferred Properties Intl Realty Inc

BK704943 (786) 525-0500nina@investsouthflorida.com
StateFL
CountyMiami Dade
CityKey Biscayne
Zip Code33149
Area2520
Community NameMASHTA ISLAND A REPLAT OF
Listing VS Median (in MASHTA ISLAND A REPLAT OF)
Price:
$19,900,000
low | high
Med:
$3,190,750
100% of Average
sqft:
3,085
low | high
Med:
2,982
53.354943273906% of Average
$ / sqft:
$6,451
low | high
Med:
$1,155
100% of Average
On site:
49
low | high
Med:
55.5
88.288288288288% of Average
Sourced by Back At You
Nearby Listings (Within 1/4 mile)
Price: $14.925M - $24.875M
sqft: 2,000 - 3,500
Nearby Listings Property ImageNearby Listings Details
631 N Mashta Drive Property Photo 1
$18,500,000
631 N Mashta Drive
Key Biscayne, FL 33149
Listing Updated: September 28, 2026 at 8:45:13 PM PDT

Nina Mormina - Preferred Properties Int'l Realty, Inc