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21 Denison Ave, Mystic, CT 06355 Property Records

Stonington Town property record for 21 Denison Ave, Mystic, CT 06355

Property Summary

Property TypeDuplex
Details4 bd · 2 ba · 2,880 sqft · built 1969
Lot Size0.4 acres (17,424 sqft)
Owner2 Individual Names on Record
Last Sale$245,000 (Feb 2015)
Tax Bill$8,370 (2025)
Deeds & MortgagesNov 2025 Transfer
Flood ZoneZone AE (high risk)
APNSTON M:174 B:13 L:5

Property Details

APN / Parcel Number

Primary APNSTON M:174 B:13 L:5
Alternative APNs
  • STNG M:174 B:13 L:5
  • 0075600
  • 75600

Interior

Bedrooms4 Beds
Full Baths2 Baths
Total Rooms9 Rooms
Units2 Units
Stories2 Stories
Building Area2,880 sqft Living Area
Gross Area6,569 sqft
1st Floor Area2,058 sqft
Basement Area2,058 sqft
Unfinished Basement2,058 sqft

Exterior

Year BuiltBuilt 1969
Effective Year BuiltEffective 1969
Architectural StyleCape Cod
Exterior MaterialAluminum/Vinyl
Roof TypeGable
Roof MaterialAsphalt
Lot Area17,424 sqft (0.4 acres)

Utilities, Heating & Cooling

Cooling SystemHVAC
Heating SystemHot Water
Heating FuelOil

Location & Zoning

Account Number75600
Street Address21 DENISON AVE
CityMYSTIC
StateCT
Zip06355-2808
Property CategoryResidential
Property TypeResidential > Multi-Unit > Duplex
Local Zoning CodeRH-10
Legal Block13
Legal Lot Number5
JurisdictionSTONINGTON CT
Township / Civil DivisionSTONINGTON
Census Block Group3
Census Block3031
Census Tract705300

Historic Designation

Source: NPS National Register of Historic Places, as of August 1, 2026

Historic DistrictWithin the Mystic Bridge Historic District
listed 1979 · 345 contributing resources · NRIS 79002671

Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.

Owner

Source: Stonington Town records, as of June 25, 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record2 Individual Names on Record
Mailing Address21 DENISON AVE, MYSTIC, CT 06355-2808
OccupancyOwner Occupied
Owner TypeIndividual
VestingMarried Person

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleFeb 10, 2015 · Amount on Record
Deed SaleFeb 10, 2015 · Amount on Record
Prior SaleAug 25, 1997 · Amount on Record
Deed Document Number2015276779
Deed Book / Page736 / 804
Last Transfer DateNov 6, 2025
Transfer Doc000873-701
Record UpdatedSep 20, 2026

November 2025: Quit Claim Deed, Transfer

Document TypeQuit Claim Deed
JurisdictionSTONINGTON CT
Recording DateNov 10, 2025
Property Address21 DENISON AVE, MYSTIC, CT 06355-2808
Document Number000873-701
Book / Page873 / 701
Instrument DateNov 6, 2025
Transaction TypeTransfer
Record UpdatedDec 3, 2025

Transaction

Tax$0.00
Amount AccuracyNo Consideration Stated
Additional
  • Quitclaim
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address21 DENISON AVE, MYSTIC, CT 06355-2808

Tax Assessment & Valuation

Source: Stonington Town assessment roll, as of June 25, 2026

Property Jurisdictions

TypeName
StateConnecticut
County SubdivisionStonington Town
Unified School DistrictStonington School District (PK - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2025$8,370.00$418,900 (-) Land $73,400 Building $345,500$293,230 Land $51,380 Building $241,850
2024$8,370.00 (+4%)
2023$8,048.00 (+43.23%)$418,900 (+89.29%) Land $73,400 Building $345,500
2022$5,619.00$221,300 Land $77,200 Building $144,100

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

Flood

Source: FEMA National Flood Hazard Layer, effective September 20, 2026

FEMA Flood ZoneZone AE
high risk
100-Year FloodplainYes
1% annual chance
FloodwayNo
Base Flood Elevation11.0 ft
Flood Insurance RequirementRequired
federally backed loans

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

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 SystemAQUARION-MYSTIC
private · serves 10,788 people · EPA ID CT1370011
Water SourceSurface water
Last State InspectionNov 2025
LeadUnder 1 ppb (2026)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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 342 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Frontier
Fiber		7,000 / 7,000
Xfinity
Cable		2,000 / 250
Breezeline
Cable		1,000 / 50
AT&T
Fixed Wireless		100 / 20
T-Mobile
Fixed Wireless		100 / 20

May also be available: Verizon.

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