Tour
#A11815194, Maria Donnelly, Listing office: BHHS EWM Realty
$18,900,000 List price
520 S Mashta Dr Key Biscayne, FL 33149
5 beds
4 full
3,085 sqft
$6,126 / sqft
House
Property details
About 520 S Mashta Dr
Seize the rare chance to create your dream estate on one of the largest lots in Key Biscayne's prestigious Mashta Island community. This 22,140-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.
Highlights
Home typeSingle Family Residence
HeatingCentral
StatusActive
CoolingCentral Air
Size3,085 sqft
Year built1961
ParkingDriveway
MLS #A11684094
Garage2 spaces
WaterfrontBay Front, Seawall
ViewBay, Ocean
Virtual tour
Summary
- Full Bathrooms: 4
- Appliances: Other
- Flooring Type: Tile
- Interior: Bedroom on Main Level, First Floor Entry, Split Bedrooms
- Total Bedroom Count: 5
- Garage Space: 2 spaces
- Parking: Driveway
- Waterfront: Bay Front, Seawall
- View: Bay, Ocean
- Exterior: Security/High Impact Doors
- Architectural Style: One Story
- Heating: Central
- Cooling: Central Air
- List Price: $18,900,000
- Price/SqFt: $6,126
- Annual Tax Amount: $179,581
- Tax Year: 2023
- Year Built: 1961
- Stories: 1
- Living Area: 3,085 SqFt
- MLS Number: A11684094
- MLS Name: SEFMIAMI
- Office Name: Douglas Elliman
- Office Phone: (305) 695-6300
- Office Email: iakhrass@elliman.com
- Listing Agent: Jonathan Matos
© 2025 Miami Association of REALTORS®. All rights reserved. The data relating to real estate on this web site comes in part from the Internet Data Exchange program of the MLS of the Miami Association of REALTORS®. All information is deemed reliable but not guaranteed by the MLS and should be independently verified. The MLS, this broker and their affiliates provide all content therein “AS IS” and without any warranty, express or implied. The information included in this listing is provided exclusively 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. This property is offered without respect to any protected classes in accordance with the law.
Data displayed may be a portion of, and not a complete set of all listings published in the MLS.
Last updated on: 6/17/2025, 9:45:29 AM Eastern. If you have any questions regarding the accuracy of this data, please contact us at help@rockethomes.com.
Get an agent. Get a mortgage. Save big.¹
$18,900,000
520 S Mashta Dr
Sell your home with Rocket and save even more!
Seller rebate
0.5% sale price²
Price information
Property sales
We're sorry, we currently don't have property sales data for this listing.
Tax history
| Year | Assessment | Property Tax |
|---|---|---|
| 2023 | $11,623,601 | $179,581 |
| 2022 | $10,671,647 | $160,167 |
| 2021 | $9,313,016 | $163,376 |
| 2020 | $8,981,814 | $154,367 |
| 2018 | $8,983,609 | $143,888 |
| 2017 | $10,534,307 | $167,074 |
History based on county public records data.
Nearby schools
8
Key Biscayne K-8 Center
Public District PK-5
0.6 mi
•150 W McIntyre St
9
Coconut Grove Elementary School
Public District PK-5
5.4 mi
•3351 Matilda St
7
Southside Elementary School
Public Magnet PK-5
5.6 mi
•45 SW 13th St
School ratings are a score out of 10, where 10 is the highest and 1 is the lowest.
Neighborhood
The neighbors living near this home have an average income of $134,750. Typical income of Key Biscayne, FL residents is between $100k-200k annually. Residents typically live in married, no kids family. Residents of this area typically have post secondary degree education.
How much money do the neighbors make?
14%
<35k
13%
35k-100k
47%
100k-200k
26%
200k+
What level of education do the neighbors have?
High School Diploma
Post Secondary Degree
Masters Degree
Doctorate
What types of families live nearby?
18%
Single, No Kids
6%
Single, with Kids
39%
Married, No Kids
37%
Married, with Kids
Are the neighbors home owners or renters?
Home Owners
Renters
How old are people in this area?
14%
<11 yrs old
12%
12-17 yrs old
14%
18-34 yrs old
46%
35-64 yrs old
14%
65+ yrs old
What do the neighbors do for fun?
Skiing/snowboarding
Men's Tennis- Tennis
Where do the neighbors shop?
Nordstrom
Bloomingdales
Brooks Brothers
Where do the neighbors go to eat?
California Pizza Kitchen
Bonefish Grill
Qdoba
What do the neighbors drive?
BMW
Lexus
Acura
What do the neighbors listen to?
Talk/Personality
News
Sports
All data provided by Home Junction and Claritas
Similar homes for sale
Tour
#RX-11060323, Javier Gustavo Quiroz, Listing office: Coldwell Banker
#A11779615, Brigitte Nachtigall, Listing office: One Sotheby's International Realty
Tour
#A11789524, Brigitte Pfindel, Listing office: Dezer Platinum Realty LLC
Tour
#A11744118, Elena Chacon, Listing office: BHHS EWM Realty
Tour
#A11683315, Sharon Weissman Harari, Listing office: One Sotheby's International Realty
Tour
#A11742045, Giulietta Ulloa, Listing office: BHHS EWM Realty
Tour
#A11652379, Eduardo Vera, Listing office: Cervera Real Estate Inc.
#A11762225, Dora Puig, Listing office: Luxe Living Realty
Tour
#A11755461, Florencia Capiel De Moni, Listing office: BHHS EWM Realty
Frequently asked questions
About 520 S Mashta Dr
The listing price of 520 S Mashta Dr property is $18,900,000.
The property 520 S Mashta Dr is a house located in Key Biscayne, Florida, 33149.
Active Listing: 520 S Mashta Dr is For Sale (Active/New) which means the seller is accepting offers.
The nearby schools for 520 S Mashta Dr are: Key Biscayne K-8 Center (GreatSchools Rating 8/10), Coconut Grove Elementary School (GreatSchools Rating 9/10), Southside Elementary School (GreatSchools Rating 7/10), Mater Grove Academy (GreatSchools Rating 7/10), Shenandoah Middle School (GreatSchools Rating 5/10), George Washington Carver Middle School (GreatSchools Rating 10/10), Mast Academy (GreatSchools Rating 10/10), New World School of the Arts (GreatSchools Rating 9/10), School for Advanced Studies-Wolfson (GreatSchools Rating 10/10).
According to the records, the last property tax for 2023 is $179,581 (source: MLS/based on county public records data).
The property at 520 S Mashta Dr has 5 bedrooms and 4 bathrooms.
The property 520 S Mashta Dr is 3,085 SqFt (source: MLS/tax record).
The year of construction for 520 S Mashta Dr is 1961.
This home is located at 520 S Mashta Dr in Key Biscayne, FL and zip code 33149. This 3,085 square foot home was built in 1961. Features: 5 bedrooms, 4 bathrooms. It has been listed on Rocket Homes since October 29, 2024 and is currently priced at $18,900,000.
Key Biscayne, FL housing market in May 2025 saw over 1 listings sold above listed price, more than 0 sold at listed price and over 12 sold below. The number of homes for sale in Key Biscayne, FL increased by 1.5% between April and May 2025. The median list price of listings available in May 2025 was $1,395,000, while the average time on the real estate market was 112 days.
From Rocket Homes Real Estate and based on county public records data.