$18,500,000
520 S Mashta Dr, Key Biscayne FL 33149
80 days on marketPrice reduced $1,400,000 on Oct 23, 2026
- Bedrooms
- 5
- Bathrooms
- 4
- Living area
- 3,085 sqft
- Price per sqft
- $5,997
- Type
- Single Family Residence
- Year built
- 1961
- Taxes
- $201,741/yr
- Waterfront
- Yes
- MLS #
- A12071221
About this home
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.
Estimated subtotal
$16,812/mo
- Principal and interestThe current market rate is not available right now. Enter the rate your lender quoted.
- Not included
- Property taxMLS 2026 annual tax, shown monthly
- $16,812
- HOANot in the MLS record
- Not included
The current market rate is not available right now. Enter the rate your lender quoted.
Estimate. Jumbo and investor loans are often priced differently; verify with your lender. Property tax is the seller's current bill and may be reassessed after purchase. Items marked Not included are not in this total.
Is this the right price?
We send written comps, the full cost of owning it and an offer strategy before you tour or offer.
The neighborhood
Key Biscayne, 33149
Listing courtesy of Coldwell Banker Realty
Listing data provided by the Miami Association of Realtors MLS, deemed reliable but not guaranteed.