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520 S Mashta Dr, Key Biscayne, FL 33149 Property Records

Miami-Dade County property record for 520 S Mashta Dr, Key Biscayne, FL 33149

Property Summary

Property TypeSingle Family Home
Details3 bd · 4 ba · 3,085 sqft · built 1961
Lot Size0.508 acres (22,140 sqft)
OwnerCompany Name on File
Last Sale$16,500,000 (Mar 2024)
Tax Bill$218,766 (2025)
Deeds & MortgagesApr 2023 Mortgage
Mar 2024 Sale
Flood ZoneZone AE (high risk)
APN24-5205-009-0170

Property Details

APN / Parcel Number

Primary APN24-5205-009-0170

Interior

Bedrooms3 Beds
Full Baths4 Baths
Stories1 Story
Building Area3,085 sqft Living Area
Gross Area4,177 sqft
1st Floor Area3,085 sqft

Exterior

Year BuiltBuilt 1961
Effective Year BuiltEffective 1971
Exterior MaterialConcrete Block
Construction TypeConcrete Block
Lot Area22,140 sqft (0.508 acres)
Lot Dimensions164 ft deep x 135 ft wide
Patio Area490 sqft

Location & Zoning

Street Address520 S MASHTA DR
CityKEY BISCAYNE
StateFL
Zip33149-1733
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning Code2001
Legal Description5-6 55 42 MASHTA ISLAND A REPLAT OF TRS A & C SELY35FT LOT 16 & ALL LT 17 BLKBLK 3 LOT SIZE 135.000 X 164 OR 15816-1278 1292 1
Legal Range42E
Legal Township55S
Legal Section05
Legal SubdivisionMASHTA ISLAND
Legal TractA,C
Legal Block3
Legal Lot Number16,17
JurisdictionDADE FL
Township / Civil DivisionKEY BISCAYNE
Census Block Group1
Census Block1004
Census Tract4602

Owner

520 S Mashta Dr is owned by a company that bought it in March 2024.

Source: Miami-Dade County records, as of October 21, 2026

Owner of RecordCompany Name on File
Mailing Address2000 S BAYSHORE DR, 59, MIAMI, FL 33133-3252
Owner TypeCompany
VestingCompany

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

DateDocument
Apr 24, 2023Deed of Trust, Mortgage · Conventional Mortgage
CITY NATIONAL BANK OF FLORIDA
Mar 5, 2024Warranty Deed, Transfer
ATTORNEY ONLY, ATTORNEY

Assessor's Deed Record

Deed NamesName on Deed
Last SaleMar 5, 2024 · Amount on File
Deed SaleMar 5, 2024 · Amount on File
Prior SaleApr 23, 2014 · Amount on File
Deed Document Number2024168688
Deed Book / Page34118 / 4416
Record UpdatedOct 29, 2026

April 2023: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionDADE FL
Property Address520 S MASHTA DR, KEY BISCAYNE, FL 33149-1733
Transaction TypeMortgage
Record UpdatedApr 2, 2024

Transferred To (Grantee/Buyer)

NameVerified Name
Address521 S MASHTA DR, KEY BISCAYNE, FL 33149-1732

Mortgage

Document Number0000271602
DateApr 24, 2023
Book Page33676/4990
Instrument2023R0271602
Lender
NameCITY NATIONAL BANK OF FLORIDA
TypeBank
AddressMIAMI, FL 33131
Agreement
TypeConventional Mortgage
AmountAmount on Record
Term361 Months
DueMay 1, 2053
Interest
Rate TypeAdjustable Rate
Rate5.87%
Type Change DateMay 1, 2033
Change Frequency6 Months
Min Rate At Change2.75%
Max Rate At Change10.8%
IndexOther
Max Rate10.8%

March 2024: Warranty Deed, Transfer

Document TypeWarranty Deed
JurisdictionDADE FL
Recording DateMar 5, 2024
Property Address520 S MASHTA DR, KEY BISCAYNE, FL 33149-1733
Document Number0000168688
Book / Page34118 / 4416
Map ReferenceMB 65 PG 65
Instrument DateFeb 23, 2024
Instrument2024R0168688
Transaction TypeTransfer
Record UpdatedApr 2, 2024
Title CompanyATTORNEY ONLY, ATTORNEY

Transaction

AmountAmount on Record
Tax$99,000.00
Amount AccuracyRounded by County
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name
Address521 S MASHTA DR, KEY BISCAYNE, FL 33149-1732

Transferred To (Grantee/Buyer)

NameVerified Name
Address2000 S BAYSHORE DR APT 59, 59, MIAMI, FL 33133-3252

Tax Assessment & Valuation

The 2025 property tax bill for 520 S Mashta Dr was $218,766.

Source: Miami-Dade County assessment roll, as of October 21, 2026

Property Jurisdictions

TypeName
StateFlorida
CountyMiami-Dade County
MunicipalityKey Biscayne Village
Unified School DistrictDade County School District (PK - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2025$218,766.00$12,870,000 Land $12,845,173 Building $24,827$12,870,000 Land $12,845,173 Building $24,827
2023$179,581.00 (+12.12%)$11,623,601 (+8.92%) Land $11,468,520 Building $155,081$11,623,601 (+8.92%) Land $11,468,520 Building $155,081
2022$160,167.00$10,671,647 Land $10,516,500 Building $155,147$10,671,647 Land $10,516,500 Building $155,147

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 520 S Mashta Dr in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.

Source: FEMA National Flood Hazard Layer, effective January 25, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone AE
high risk
100-Year FloodplainYes
1% annual chance
FloodwayNo
Base Flood Elevation10.0 ft
Flood Insurance RequirementRequired
federally backed loans
Flood Insurance CostPremium on File
median of 201 policies
Community Rating SystemClass 8 (10% premium discount)
Nearby Flood Policies201 in force
Nearby Flood Claims312 (1979–2024)
Claims Outside the SFHA1 of 312
Most Recent ClaimJun 2024 · rainfall accumulation
Claims by Event
  • Hurricane Irma, Sep 2017 · 38 claims
  • Hurricane Wilma, Oct 2005 · 26 claims
  • Hurricane Andrew, Aug 1992 · 195 claims

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

The area around 520 S Mashta Dr has no burnable land within ember reach, so its wildfire risk is not rated.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskNot rated
no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemMDWASA - MAIN SYSTEM
serves 2,377,460 people · EPA ID FL4130871
Water SourceGroundwater
Last State InspectionDec 2023
Lead3 ppb (2023)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting6
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 247 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
AT&T
Fiber · Fixed Wireless · DSL		5,000 / 5,000
Xfinity
Cable		2,000 / 250
Verizon
Fixed Wireless		300 / 20
T-Mobile
Fixed Wireless		100 / 20

Cell Coverage

5G (outdoors only) and 4G LTE

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