31 Mill St, Dorchester, MA 02122 Property Records

Suffolk County and Boston City property record for 31 Mill St, Dorchester, MA 02122

Property Summary

Property Type	Triplex
Details	7 bd · 3.5 ba · 3,704 sqft · built 1830
Lot Size	1.1 acres (48,317 sqft)
Owner	Trust Name on File
Last Sale	$1,600,000 (Mar 2023)
Tax Bill	$17,853 (2025)
Deeds & Mortgages	Oct 2023 Refinance Mar 2023 Sale + 1 more
Flood Zone	Zone X (minimal risk)
APN	`DORC W:16 P:00108 S:000`

Property Details

APN / Parcel Number

Primary APN	`DORC W:16 P:00108 S:000`

Interior

Bedrooms	7 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Total Rooms	14 Rooms
Units	3 Units
Stories	2 Stories
Building Area	3,704 sqft Living Area
Gross Area	6,905 sqft

Exterior

Year Built	Built 1830
Effective Year Built	Effective 1830
Architectural Style	Conventional
Exterior Material	Wood Siding
Foundation Type	No Foundation
Roof Type	Gable
Roof Material	Asphalt
Lot Area	48,317 sqft (1.1 acres)
Parking Spaces	8 Parking Spaces

Utilities, Heating & Cooling

Heating System	Hot Water

Location & Zoning

Street Address	31 MILL ST
City	DORCHESTER
State	MA
Zip	02122-3561
Property Category	Residential
Property Type	Residential > Multi-Unit > Triplex
Local Zoning Code	R3
Jurisdiction	BOSTON MA
Township / Civil Division	BOSTON
Census Block Group	3
Census Block	3012
Census Tract	92101

Historic Designation

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

Historic District	Within the Harrison Square Historic District listed 2002 · 141 contributing resources · NRIS 02001190

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

Owner

31 Mill St, a triplex, is held in a trust since March 2023.

Source: Suffolk County and Boston City records, as of April 14, 2026

Owner of Record	Trust Name on File
Mailing Address	PO BOX 220436, DORCHESTER, MA 02122-0016
Owner Type	Company
Vesting	Trust

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

Date	Document
Oct 25, 2023	Deed of Trust, Mortgage · Stand-Alone Refinance NEEDHAM BANK
Mar 31, 2023	Deed, Transfer
Nov 3, 2020	Fiduciary Deed, Transfer NOT AVAILABLE

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Mar 31, 2023 · Amount on File
Deed Sale	Mar 31, 2023 · Amount on File
Deed Document Number	202318760
Deed Book / Page	68835 / 323
Prior Transfer Date	Oct 27, 2020
Prior Transfer Doc	64107-1
Record Updated	Jun 8, 2026

October 2023: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOSTON MA
Property Address	31 MILL ST, DORCHESTER, MA 02122-3561
Transaction Type	Mortgage
Record Updated	Nov 10, 2023

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	069559-218
Date	Oct 25, 2023
Book Page	69559/218
Instrument	67753

Lender

Name	NEEDHAM BANK

Agreement

Type	Stand-Alone Refinance
Amount	Amount on Record

March 2023: Deed, Transfer

Document Type	Deed
Jurisdiction	BOSTON MA
Recording Date	Mar 31, 2023
Property Address	31 MILL ST, DORCHESTER, MA 02122-3561
Document Number	068835-323
Book / Page	68835 / 323
Instrument Date	Mar 30, 2023
Instrument	18760
Transaction Type	Transfer
Record Updated	Apr 14, 2023

Transaction

Amount	Amount on Record
Tax	$0.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	16 SACO ST, BOSTON, MA 02122-2647

November 2020: Fiduciary Deed, Transfer

Document Type	Fiduciary Deed
Jurisdiction	BOSTON MA
Recording Date	Nov 3, 2020
Property Address	31 MILL ST, DORCHESTER, MA 02122-3561
Document Number	64107-1
Book / Page	064107 / 000001
Instrument Date	Oct 27, 2020
Instrument	96735
Transaction Type	Transfer
Record Updated	Nov 24, 2020
Title Company	NOT AVAILABLE

Transaction

Tax	$0.00
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	31 MILL ST DORCHESTER MA 02121, DORCHESTER, MA 02121

Tax Assessment & Valuation

The 2025 property tax bill for 31 Mill St was $17,853, up 34% from the year before.

Source: Suffolk County and Boston City assessment roll, as of April 14, 2026

Property Jurisdictions

Type	Name
State	Massachusetts
County	Suffolk County
Municipality	Boston City
Unified School District	Boston School District (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2025	$17,853.00 (+34.04%)	$1,541,700 (+26.17%) Land $859,200 Building $682,500
2024	$13,319.00 (+9.63%)	$1,221,900 (+8.02%) Land $765,700 Building $456,200
2023	$12,149.00	$1,131,200 Land $708,900 Building $422,300

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 31 Mill St in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 2000.

Source: FEMA National Flood Hazard Layer, effective January 21, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 10 (0% premium discount)
Nearby Flood Policies	1 in force
Nearby Flood Claims	1 (2000)
Most Recent Claim	Aug 2000 · rainfall accumulation

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 31 Mill St 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 Risk	Not 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 System	BOSTON WATER AND SEWER COMMISSION (MWRA) serves 675,647 people · EPA ID MA3035000
Water Source	Purchased surface water from MWRA
Last State Inspection	Mar 2026
Lead	6 ppb (2026) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	Lead service line replacement currently in violation since Nov 2020
Monitoring and Reporting	None 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 703 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Verizon Fiber · Fixed Wireless in parts of the area	2,300 / 2,300
Xfinity Cable · Fiber in parts of the area	2,000 / 2,000
Astound Broadband Cable	1,500 / 50
Netafy Fixed Wireless	600 / 150
AT&T Fixed Wireless	100 / 20

May also be available: T-Mobile.

Nearby Properties on Mill St

Nearby Streets

Search Property Records by Address or Parcel Number

Search by:

By searching, you agree to: Terms • Privacy • Disclosures