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.
For sale
$19,900,000
520 S Mashta Dr, Key Biscayne, FL 33149
5beds
3,085sqft
Single Family Residence
Built in 1961
0.51 Acres Lot
$-- Zestimate®
$6,451/sqft
$-- HOA
What's special
Sweeping open water viewsExceptional lot sizeExpansive water frontage
- 3 days |
- 588 |
- 26 |
Likely to sell faster than
Zillow last checked:
Listing updated:
Listed by:
Maureen Jauregui 305-798-3124,
Coldwell Banker Realty,
Emma Jauregui 786-201-1707,
Coldwell Banker Realty
Source: MIAMI,MLS#: A12071221
Originating MLS: A-Miami Association of REALTORS
Originating MLS: A-Miami Association of REALTORSFacts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 4
- Full bathrooms: 4
Rooms
- Room types: Family Room
Heating
- Central
Cooling
- Central Air
Appliances
- Included: Other
Features
- Split Bedroom
- Flooring: Tile
- Doors: High Impact Doors
Interior area
- Total structure area: 4,177
- Total interior livable area: 3,085 sqft
Video & virtual tour
Property
Parking
- Total spaces: 2
- Parking features: Driveway
- Garage spaces: 2
- Has uncovered spaces: Yes
Features
- Stories: 1
- Entry location: First Floor Entry
- Has private pool: Yes
- Pool features: In Ground
- Has view: Yes
- View description: Bay, Ocean
- Has water view: Yes
- Water view: Bay,Ocean
- Waterfront features: Ocean Access, Seawall, WF/Pool/Ocean Access, Bay
- Frontage type: Bay/Harbor
- Frontage length: 138
Lot
- Size: 0.51 Acres
- Features: 1/2 To Less Than 3/4 Acre Lot
Details
- Parcel number: 2452050090170
- Zoning: 2001
- Other equipment: Other
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Single Family Residence
Materials
- Concrete Block Construction
- Roof: Barrel Roof,Curved/S-Tile Roof
Condition
- Year built: 1961
Utilities & green energy
- Sewer: Public Sewer
- Water: Municipal Water
Community & HOA
Community
- Features: Other Subdivision - See Remarks
- Subdivision: Mashta Island A Replat Of
HOA
- Has HOA: No
Location
- Region: Key Biscayne
Financial & listing details
- Price per square foot: $6,451/sqft
- Tax assessed value: $12,870,000
- Annual tax amount: $201,741
- Date on market: 8/12/2026
- Listing terms: All Cash,Conventional
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 8/17/2026 | Price change | $19,900,000+5.3%$6,451/sqft |
Source:  MIAMI #A12071221 Report a problem | ||
| 1/6/2025 | Price change | $18,900,000-5.5%$6,126/sqft |
Source: MIAMI #A11684094 Report a problem | ||
| 10/29/2024 | Listed for sale | $20,000,000+21.2%$6,483/sqft |
Source: MIAMI #A11684094 Report a problem | ||
| 2/26/2024 | Sold | $16,500,000-4.1%$5,348/sqft |
Source: MIAMI #A11502495 Report a problem | ||
| 1/15/2024 | Pending sale | $17,200,000$5,575/sqft |
Source: MIAMI #A11502495 Report a problem | ||
| 1/11/2024 | Listing removed | -- |
Source: MIAMI #A11326642 Report a problem | ||
| 12/20/2023 | Listed for sale | $17,200,000+97.7%$5,575/sqft |
Source: MIAMI #A11502495 Report a problem | ||
| 7/17/2023 | Price change | $29,000-23.7%$9/sqft |
Source: MIAMI #A11326642 Report a problem | ||
| 1/17/2023 | Listed for rent | $38,000+38.2%$12/sqft |
Source: MIAMI #A11326642 Report a problem | ||
| 6/13/2018 | Listing removed | $27,500$9/sqft |
Source: Fortune International Realty #A10420432 Report a problem | ||
| 2/16/2018 | Listed for rent | $27,500+77.4%$9/sqft |
Source: Fortune International Realty #A10420432 Report a problem | ||
| 7/28/2015 | Listing removed | $15,500$5/sqft |
Source: Fortune International Realty #A2025703 Report a problem | ||
| 7/22/2015 | Listed for rent | $15,500-22.5%$5/sqft |
Source: Fortune International Realty #A2025703 Report a problem | ||
| 6/6/2015 | Listing removed | $20,000$6/sqft |
Source: Miami Association of Realtors #A2025703 Report a problem | ||
| 4/29/2015 | Listed for rent | $20,000$6/sqft |
Source: Diamond Centurion Real Estate Report a problem | ||
| 3/5/2015 | Listing removed | $20,000$6/sqft |
Source: Fortune International Realty #A2025703 Report a problem | ||
| 10/30/2014 | Listed for rent | $20,000$6/sqft |
Source: Fortune International Realty #A2025703 Report a problem | ||
| 4/23/2014 | Sold | $8,700,000-3.3%$2,820/sqft |
Source: Public Record Report a problem | ||
| 2/22/2014 | Listed for sale | $9,000,000$2,917/sqft |
Source: Fortune International Realty #A1910236 Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $218,766 +12.7% | $12,870,000 +7.7% |
| 2024 | $194,171 +8.1% | $11,953,597 +10% |
| 2023 | $179,582 +9.9% | $10,866,907 +10% |
| 2022 | $163,377 +5.8% | $9,879,007 +6.1% |
| 2021 | $154,367 +4.1% | $9,313,016 +3.7% |
| 2020 | $148,349 -0.3% | $8,981,814 0% |
| 2019 | $148,733 +3.4% | $8,982,712 0% |
| 2018 | $143,889 | $8,983,609 -11.9% |
| 2017 | $143,889 -13.9% | $10,194,286 +10% |
| 2016 | $167,074 +17.3% | $9,267,533 +10% |
| 2015 | $142,423 +1.3% | $8,425,030 +9.6% |
| 2014 | $140,649 +25.1% | $7,688,036 +10% |
| 2013 | $112,421 +0% | $6,989,124 +7.7% |
| 2012 | $112,421 +8.6% | $6,487,338 +9.5% |
| 2011 | $103,500 +2.4% | $5,923,694 +10% |
| 2010 | $101,093 -19.9% | $5,385,177 -23.8% |
| 2009 | $126,186 -5.3% | $7,063,362 -7.3% |
| 2007 | $133,259 +53.5% | $7,621,865 |
| 2006 | $86,829 | -- |
| 2005 | $86,829 +40.9% | -- |
| 2004 | $61,617 +24.5% | -- |
| 2003 | $49,480 +29% | -- |
| 2002 | $38,352 | -- |
| 2001 | $38,352 | -- |
Find assessor info on the county website
Monthly payment
Est. payment
Payment breakdown
Explore the cost of this home by adjusting the details. Changes won't be saved.Climate risks
Neighborhood: 33149
Nearby schools
GreatSchools rating
- 8/10Key Biscayne K-8 CenterGrades: PK-8Distance: 0.6 mi
- 5/10Coral Gables Senior High SchoolGrades: PK,9-12Distance: 6.6 mi
- 6/10Ponce De Leon Middle SchoolGrades: 6-8Distance: 6.6 mi
Schools provided by the listing agent
- Elementary: Keybiscayne
- Middle: Ponce De Leon
- High: Coral Gables
Source: MIAMI. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
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A local agent can set up tours, give advice and negotiate with sellers.
A local lender can help you make sure your offer is ready when you are.
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