21 Gray St #B, Cambridge — property record card

Residential Condominium built in 1903 in Cambridge, assessed at $3,674,900 for fiscal year 2026; last sold for $1,805,000 on June 18, 2025.

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

Parcel

Location	21 Gray St #B, Cambridge MA 02139
Map and parcel ID	212-4 212-4-B
Use	Residential Condominium (use code 102)
County	Middlesex

Valuation — fiscal year 2026

Building	$3,674,900
Land	$0
Total assessed	$3,674,900

Building

Year built	1903
Style	TWO-FLOORS
Living area	2,260 ft²
Rooms	9
Stories	1
Units	3

Last recorded sale

Price	$1,805,000
Date	June 18, 2025
Deed	Registry of Deeds book 84243, page 0068

3 assessor accounts on this parcel

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

Address	Account	Use	Assessed	Last sale
21 Gray St	212-4	CONDO-BLDG	$0	nominal ($0) September 8, 2004
21 Gray St #A	212-4-A	Residential Condominium	$1,588,900	$1,805,000 June 18, 2025
21 Gray St #B	212-4-B	Residential Condominium	$2,086,000	$1,730,000 July 21, 2017

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 1 site with an Activity and Use Limitation. All MassDEP sites in Cambridge.

What this means

Assessed 26% above the median residential condominium in Cambridge ($2,924,050, 2,506 parcels).
The last sale price is 51% 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: Cambridge 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 21 Gray St #B

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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