520 S Mashta Dr, Key Biscayne, FL 33149
Property image
Property image
FOR SALE
3D VIEW
0.51 ACRES

$19,900,000

  • 5 Beds
  • 4 Baths
  • 3,085 sqft (on 0.51 acres)

520 S Mashta Dr, Key Biscayne, FL 33149

Est. Mortgage $133,528/mo*
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We estimate this home will sell faster than 94% nearby.

Home Highlights

Single-Family Home
Built in 1961
0.51 acre lot
$6,451/sqft
Garage

Local Information

  • Map ViewExplore the area around 520 S Mashta Dr.
  • Schools2 Preschool Schools1 Elementary School2 Middle Schools1 High School
  • Shop & Eat
-- mins to
Commute Destination

About this House

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.
Last check for updates: about 17 hours ago
Listing courtesy of Maureen Jauregui, (305) 798-3124
Coldwell Banker Realty
Emma Jauregui, (786) 201-1707
Coldwell Banker Realty
Originating MLS: A-Miami Association of REALTORS
Source: MIAMI, MLS#A12071221
Also Listed on MIAMI.
We estimate this home will sell faster than 94% nearby.

Home Details for 520 S Mashta Dr

Interior Features

Beds & Baths
Number of Bedrooms: 5Number of Bathrooms: 4Number of Bathrooms (full): 4
Dimensions and Layout
Living Area: 3085 Square Feet
Appliances & Utilities
Appliances: Other
Heating & Cooling
Heating: CentralHas CoolingAir Conditioning: Central AirHas HeatingHeating Fuel: Central
Windows, Doors, Floors & Walls
Door: High Impact DoorsFlooring: Tile
Levels, Entrance, & Accessibility
Stories: 1Entry Location: First Floor EntryFloors: Tile
View
Has a ViewView: Bay, Ocean

Exterior Features

Exterior Home Features
Roof: Barrel Roof Curved S Tile RoofHas a Private Pool
Parking & Garage
Number of Garage Spaces: 2Number of Covered Spaces: 2Has a GarageHas Open ParkingParking Spaces: 2Parking: Driveway
Pool
Pool: In GroundPool
Frontage
WaterfrontWaterfront: Ocean Access, Seawall, WF/Pool/Ocean Access, BayFrontage Type: Bay/HarborOn Waterfront
Water & Sewer
Sewer: Public Sewer
Farm & Range
Frontage Length: 138Not Allowed to Raise Horses
Surface & Elevation
Elevation Units: Feet

Days on Market

Days on Market: 20

Property Information

Year Built
Year Built: 1961
Property Type / Style
Property Type: ResidentialProperty Subtype: Single Family ResidenceStructure Type: House, AttachedArchitecture: House,Attached
Building
Building Name: Mashta Island A Replat OfConstruction Materials: Concrete Block Construction
Property Information
Parcel Number: 2452050090170

Price & Status

Price
List Price: $19,900,000Price Per Sqft: $6,451
Status Change & Dates
Possession Timing: Funding

Active Status

MLS Status: Active

Media

Location

Direction & Address
City: Key BiscayneCommunity: Mashta Island A Replat Of
School Information
Elementary School: KeybiscayneJr High / Middle School: Ponce De LeonHigh School: Coral Gables

Agent Information

Listing Agent
Listing ID: A12071221

Building

Building Area
Building Area: 4177 Square Feet

Community

Community Features: Other Subdivision - See Remarks

HOA

Association for this Listing: A-Miami Association of REALTORSNo HOA

Lot Information

Lot Area: 0.51 acres

Offer

Listing Terms: All Cash, Conventional

Miscellaneous

Mls Number: A12071221Water ViewWater View: Bay, Ocean

Additional Information

Other Subdivision - See RemarksSource Internet Entire Listing Display

Around this home

View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Key Biscayne

At least 116 Trulia users voted on each feature.

  • 94 % Say it's walkable to grocery stores

  • 94 % Say kids play outside

  • 90 % Say it's dog friendly

  • 90 % Say it's walkable to restaurants

  • 86 % Say people would walk alone at night

  • 86 % Say there are sidewalks

  • 79 % Say it's quiet

  • 79 % Say there's holiday spirit

  • 76 % Say they plan to stay for at least 5 years

  • 68 % Say parking is easy

  • 67 % Say streets are well-lit

  • 60 % Say there are community events

  • 58 % Say neighbors are friendly

  • 54 % Say yards are well-kept

  • 52 % Say there's wildlife

  • 50 % Say car is needed

Sourced by Trulia users. Learn more about our methodology.
  • Othoniel Marlieri
    "Key Biscayne os a perfect place to leave, but need more attention about basic things like a Super Market and safe environment. "
    0
    Flag
  • Mariafedc
    "There are lots of places that are dog friendly. There’s a dog park. Many dog owners live in the area. "
    0
    Flag
  • Lladom
    "Very safe and friendly community. Excellent for growing up kids. Traffic is the downside. Best town in South Florida by large."
    0
    Flag
  • Ericazc
    "Christmas, 4th of July, and many other beautiful family events happens in the island. Great place for the kids. "
    1
    Flag
  • Deborah B.
    "Have been spending winters here for 53 years. Love the family focus, beautiful beaches and public amenities. Thoughtful services like free Freebee pick ups and transportation to shopping make the Key accessible for teens to seniors. "
    0
    Flag
  • Mati P.
    "Its beautiful, peaceful and safe. I feel great living here. It’s lush, people are friendly, and respectful. It’s a great place to raise a family. The community is very pretty, Gardenia are manicured. There’s beautiful beaches and gorgeous homes. The school is pretty good as well. "
    2
    Flag
  • Ayishamartins
    "Some places do not allow dogs but there is a dog park weather like a bunch of dogs and mostly it’s pretty nice"
    1
    Flag
  • Mati P.
    "This is a safe neighborhood, kids walk by themselves all the time. It makes me feel safe to life here. "
    1
    Flag
  • Luis D.
    "Halloween’s decoration and fully of events in that day. Many sports in Village green. The community center has many events for all the family "
    0
    Flag
  • Adrian.grottola
    "Very friendly for pets (dogs) with great special spaces for them and many dog walkers in the island."
    0
    Flag
  • Mathew P.
    "The unity and the sense of community. The safety and sense of family oriented households that attribute to a beautiful place to live. "
    0
    Flag
  • Ivan M.
    "Save and quite perfect place for a family. There are as a public transportation electric’s cars around the island. "
    1
    Flag
  • Mayra
    "Great neighborhood! They celebrate Halloween, Christmas, Easter and much more! A lot of activities and sports for kids"
    0
    Flag
  • Efrao
    "Great place to live and I don’t commute everything is close by and i walk to work. Public transportation is great "
    0
    Flag
  • Kikisammataro
    "Halloween is a big event. Saturday has a farmers market. Kids are safe. Many schools and parks. Including dog park. "
    0
    Flag
  • Mayra
    "This is a very safe family neighborhood. Kids run freely and there’s a lot of activities for them. The school is great but the classrooms have more students than it should."
    0
    Flag
  • Ljsklein
    "My building is dog friendly. It seems like most of the people have dogs and love to walk them. We all clean up after our dogs. There’s poop bags in containers around the building with a place to dispose of them. There is also a dog park on the Key. "
    0
    Flag
  • Maria
    "I don’t have dogs. There’s a very nice dog park right next to the green field. Dogs are not allowed in the field, that is why they have their dog park, but the many owners don’t follow the rules which is very annoying. Most of all when you get the smell when exercising...."
    0
    Flag
  • Fabio
    "Great Place to leave. Good people, privacy, no crime. Walkable area, beach access, wide kind of services. Thanks "
    0
    Flag
  • Dani.montenegro
    "I can’t give my opinion because I don’t have dogs, cat or any other pet. And there are many dog owners in KB but most of them are not very respectful with people who don’t. "
    0
    Flag
  • Dcas
    "Great area for kids and young families. Very safe neighborhood and extremely easy to walk or ride a bike anywhere "
    0
    Flag
  • Kiragrossman
    "They would absolutely love the dog park. There are two sides for bigger dogs and smaller dogs. Everyone is very friendly "
    0
    Flag
  • Kiragrossman
    "This is a Great place to live. The neighborhoods are safe and it’s a great location. Great for children. Good restaurants shops"
    0
    Flag
  • Sandra S.
    "I love this neighborhood, I have everything I need is quiet and safe, walk to most places and has two state parks"
    1
    Flag
  • Kimbokak
    "Friendly, kind neighbors, close to everything, and safe. You can do pretty much everything on the island, but it is more expensive."
    1
    Flag
  • Garandrew
    "I am visiting for vacations and love this place. Nice neighborhood and friendly people. Very likely I will recommend it to my friends and family. "
    0
    Flag
  • Thengea
    "If you don't have to commute out of the island it's wonderful. Otherwise, every event causes so much traffic. Living on an island is a blessing but the peoole really don't say hello or even make eye contact at the stores or parks :/"
    0
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Market trends in Key Biscayne

Last updated July 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.56M
$26.67KMoM
Sale-to-List Price
94.6%
Price per sq ft
$981
$37MoM
Available listings
144
15MoM

Home Value

Trulia Estimate
$18.9M
Since last month
Increased$203K (+1.1%)
Since last year
Increased$2M (+12.8%)
Since last sale
Increased$2M (+14.8%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +89% in the last 10 years
MonthEstimated value
2026
August 2026$18.94M
August 2026$18.91M
July 2026$18.74M
June 2026$19.02M
May 2026$18.56M
April 2026$18.58M
March 2026$18.21M
February 2026$18.1M
January 2026$17.66M
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
591 N Mashta Dr, Key Biscayne, FL
0.12
Single-Family Home
$14,000,000
08/03/26
4
4.5
4,290
180 Cape Florida Dr, Key Biscayne, FL
0.60
Single-Family Home
$21,000,000
02/26/26
6
7
8,031
677 Hampton Ln, Key Biscayne, FL
0.49
Single-Family Home
$3,125,000
03/09/26
5
3.5
2,429
670 Allendale Rd, Key Biscayne, FL
0.42
Single-Family Home
$3,475,000
01/27/26
5
4.5
2,320
600 Allendale Rd, Key Biscayne, FL
0.49
Single-Family Home
$3,500,000
01/16/26
4
3.5
2,775
762 Fernwood Rd, Key Biscayne, FL
0.54
Single-Family Home
$5,690,000
06/15/26
6
5
3,584
5 Harbor Point, Key Biscayne, FL
0.52
Single-Family Home
$23,500,000
07/06/26
3
5
10,926
635 Curtiswood Dr, Key Biscayne, FL
0.45
Single-Family Home
$4,950,000
04/20/26
6
6
3,888

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
510 S Mashta Dr, Key Biscayne, FL 33149
0.03
$18,434,000
5
6.5
5,226
Off Market
551 S Mashta Dr, Key Biscayne, FL 33149
0.06
$5,694,400
6
5
3,245
Off Market
571 S Mashta Dr, Key Biscayne, FL 33149
0.09
$6,350,000
4
3
2,761
For Sale
600 N Mashta Dr, Key Biscayne, FL 33149
0.12
$5,381,900
4
3
2,416
Off Market
591 N Mashta Dr, Key Biscayne, FL 33149
0.12
$14,000,000
4
4.5
4,290
Recently Sold
640 S Mashta Dr, Key Biscayne, FL 33149
0.15
$16,800,000
4
4
3,620
For Sale
660 S Mashta Dr, Key Biscayne, FL 33149
0.18
$13,356,100
7
8.5
5,043
Off Market
631 N Mashta Drive, Key Biscayne, FL 33149
0.19
$18,500,000
4
4.5
2,255
For Sale
815 Harbor Dr, Key Biscayne, FL 33149
0.23
$3,404,700
3
2
1,915
Off Market
420 Island Dr, Key Biscayne, FL 33149
0.25
$12,485,000
6
7
6,405
For Sale
730 N Mashta Dr, Key Biscayne, FL 33149
0.29
$8,197,300
6
6.5
4,225
Off Market

Price and Tax history

DateEventPrice
Aug 17, 2026
Source: MIAMI #A12071221
PriceChange
$19,900,000
Price increased by 5%
Jan 6, 2025
Source: MIAMI #A11684094
PriceChange
$18,900,000
Price decreased by 6%
Oct 29, 2024
Source: MIAMI #A11684094
Listed For Sale
$20,000,000
Feb 26, 2024
Source: MIAMI #A11502495
Sold
$16,500,000
Jan 15, 2024
Source: MIAMI #A11502495
Pending
$17,200,000

LGBTQ Local Legal Protections

Maureen Jauregui, Coldwell Banker Realty
Agent Phone: (305) 798-3124
IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but not guaranteed.

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Frequently asked questions about 520 S Mashta Dr

  • What is the estimated monthly payment for 520 S Mashta Dr?
    Based on a $19,900,000 list price with 20% down at today's rates, the estimated monthly payment for 520 S Mashta Dr in Key Biscayne, FL is approximately $135,341 (about $104,753 principal & interest, $30,513 property taxes, and $75 homeowner's insurance). This is an estimate. Actual payment depends on your loan terms.
  • How does the list price for 520 S Mashta Dr compare to homes in Key Biscayne?
    520 S Mashta Dr in Key Biscayne, FL is listed at $19,900,000, about 1178% above the $1.56M median sale price in Key Biscayne.
  • What do residents say about Key Biscayne?
    Residents describe Key Biscayne, FL as walkable to grocery stores, dog-friendly, and walkable to restaurants. See homes for sale in Key Biscayne, FL.
  • What are the closest schools to 520 S Mashta Dr?
    The closest schools to 520 S Mashta Dr in Key Biscayne, FL are Coral Gables Senior High School (Pre-K, rated 5/10), Key Biscayne K-8 Center (Pre-K/Elementary/Middle, rated 8/10), Ponce De Leon Middle School (rated 6/10).
  • Does 520 S Mashta Dr have air conditioning?
    Yes, 520 S Mashta Dr in Key Biscayne, FL has air conditioning.
  • Does 520 S Mashta Dr have a pool?
    Yes, 520 S Mashta Dr in Key Biscayne, FL has a pool.
520 S Mashta Dr, Key Biscayne, FL 33149 is a 5 bedroom, 4 bathroom, 3,085 sqft single-family home built in 1961. This property is currently available for sale and was listed by MIAMI on Aug 17, 2026. The MLS # for this home is MLS# A12071221.