12 Walnut St #1, Watertown — property record card

Residential Condominium built in 1876 in Watertown, assessed at $2,479,100 for fiscal year 2026; last sold for $1,605,000 on June 13, 2025.

Rebuilt from the Watertown assessor file as published by MassGIS — not the official card. For the official card, with owner, photo and sketch, ask the Watertown assessor’s office.

Parcel

Location	12 Walnut St #1
Map and parcel ID	1022 18 45 1022 18 45U1
Use	Residential Condominium (use code 1020)
County	Middlesex

Valuation — fiscal year 2026

Building	$2,473,100
Land	$0
Other	$6,000
Total assessed	$2,479,100

Building

Year built	1876
Style	Townhouse
Living area	3,097 ft²
Rooms	9
Units	2

Last recorded sale

Price	$1,605,000
Date	June 13, 2025
Deed	Registry of Deeds book 84223, page 580

2 assessor accounts on this parcel

Condominium units or several buildings share one parcel; each has its own assessment.

Address	Account	Use	Assessed	Last sale
12 Walnut St #1	1022 18 45U1	Residential Condominium	$1,294,000	$1,650,000 February 4, 2025
12 Walnut St #2	1022 18 45U2	Residential Condominium	$1,185,100	$1,605,000 June 13, 2025

What MassDEP has recorded

No tier-classified 21E site and no Activity and Use Limitation is mapped on this parcel.

Within about 500 m (a third of a mile): 1 active tier-classified 21E site and 4 sites with an Activity and Use Limitation. All MassDEP sites in Watertown.

What this means

Assessed 70% above the median residential condominium in Watertown ($1,461,700, 975 parcels).
The last sale price is 35% below the current assessment. Massachusetts assessments aim at full market value as of January 1 of the year before the fiscal year.
Built before 1978: the Massachusetts Lead Law applies when a child under six lives there; ask for any lead inspection or letter of compliance.

Point at the centre of the assessor parcel — not a survey.

Data: Watertown assessor file for fiscal year 2026, via MassGIS, retrieved October 30, 2026; MassDEP sites retrieved the same day. Sources and freshness. No owner names are published.

First page of a sample Massachusetts Property Report

The report for 12 Walnut St #1

This page shows the assessor record and the MassDEP sites on the parcel. The report adds what lies around it: FEMA flood zone, wetlands, Zone II and other water supply protection areas, priority habitat, sewer or septic service, protected open space, and every 21E site within half a mile.

$19card · PDF within 24 h · you pay after receiving itSee the sample (PDF)

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