520 S Mashta Dr Key Biscayne, FL 33149

Single Family Detached MLS #: A11684094 Courtesy Of Douglas Elliman

$18,900,000

5 beds | 4 baths | 3,085 sq ft
Print property details Share
Est. Property Tax: $179,582
Estimated monthly payments: $97,584/mo.* (recalculate)

Property InformationDescription

Seize the rare chance to create your dream estate on one of the largest lots in Key Biscayne's prestigious Mashta Island community. This 23,263-square-foot property features 138 feet of pristine water frontage, offering breathtaking open-water views an ideal backdrop for a grand residence. Collaborate with the renowned Corazzini & Associates, known for their award-winning designs that merge elegance with functionality. Enjoy spectacular sunsets visible throughout your home, perfect for relaxation and entertaining. Included are fully approved plans and permits for a stunning 8-bedroom, 8.5-bath, 10,000-square-foot estate, ensuring a seamless start to your vision. Don t miss this once-in-a-lifetime opportunity to establish a legacy in one of South Florida's most prestigious enclaves.
MORTGAGE CALCULATOR

Features

  • Age: Over 50 Years Old
  • Amenities: Dock, Water Front
  • Architecture Style: Other
  • Exterior Type: Block
  • Floor Covering: Tile
  • Heating System: Central Furnace
  • Roof Type: Tile
  • View Type: Ocean

VIDEOS AND TOURS

MAP & DIRECTIONS

Get Directions
520 S Mashta Dr, Key Biscayne, FL 33149
View Directions

School Information

520 S Mashta Dr, Key Biscayne, FL 33149

Elementary School
Grades PK-5 | Public School
KEY BISCAYNE K-8 CENTER
Key Biscayne, FL 33149
150 W McIntyre St
305.­361.5418
Distance: 0.6 mi
School Rating
A-
Student:Teacher Ratio
16:1
Total Students
1070
Middle School
Grades 6-8 | Public School
PONCE DE LEON MIDDLE SCHOOL
Miami, FL 33146
5801 Augusto St
305.­661.1611
Distance: 6.5 mi
School Rating
C
Student:Teacher Ratio
19:1
Total Students
1026
High School
Grades 9-12 | Public School
CORAL GABLES SENIOR HIGH SCHOOL
Coral Gables, FL 33146
450 Bird Rd
305.­443.4871
Distance: 6.6 mi
School Rating
B-
Student:Teacher Ratio
24:1
Total Students
2964
Other Nearby Schools Distance Type Grades School Rating
Key Biscayne Presbyterian School 1.2 mi Private PK-1
St Christophers 1.2 mi Private PK-6
St Agnes Academy 1.2 mi Private PK-8
Mast Academy 3.8 mi Public 6-12 A+
Amikids Miami-dade South 4.0 mi Public 6-12
Immaculata-la Salle High School 4.8 mi Private 9-12
Ransom Everglades School 5.1 mi Private 6-12
Mca Academy 5.3 mi Private 2-12
St Stephen's Episcopal Day School 5.3 mi Private PK-5
Carrollton School-sacred Heart 5.3 mi Private PK-12
Gordon Day School Of Beth David Cong. 5.4 mi Private PK-5
Coconut Grove Elementary School 5.4 mi Public PK-5 A
La Prima Casa Montessori School 5.4 mi Private PK-3
St Hugh Catholic School 5.4 mi Private PK-8
Vanguard School Of Coconut Grove Fl 5.5 mi Private UG
Coconut Grove Montessori School - Main Campus 5.6 mi Private PK-5
Coral Way K-8 Center 5.6 mi Public PK-5 B+
Silver Bluff Elementary School 5.7 mi Public PK-5 C+
Mater Grove Academy 5.8 mi Public KG-8 B+
This information is provided for general informational purposes only and should not be relied on in making any home-buying decisions. School information does not guarantee enrollment. Contact a local real estate professional or the school district(s) for current information on schools. This information is not intended for use in determining a person's eligibility to attend a school or to use or benefit from other city, town or local services.

Demographic Data

Key Biscayne, FL 33149

Median Age: 40.6
Married: 67%
Number of Households: 5,792
Households with Children: 44.2%
  • Occupancy Types
    • 0 Vacant
    • 0 Owned
    • 0 Rented
  • Transportation to Work
    • 0 Drive
    • 0 Public Transportation
    • 0 Walk / Bike / Other
    • 0 Work at Home
Copyright © 2025 MIAMI Association of REALTORS®. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified. Information being provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.