20 William St, Wellesley, MA 02481 Property Records

Norfolk County and Wellesley Town property record for 20 William St, Wellesley, MA 02481

Property Summary

Property Type	Office Building
Details	built 2001
Lot Size	3.23 acres (141,027 sqft)
Owner	2 Company Names on Record
Tax Bill	$303,066 (2026)
Flood Zone	Zone X (minimal risk)
APN	`WELL M:002 R:001 S`

Property Details

APN / Parcel Number

Primary APN	`WELL M:002 R:001 S`

Interior

Units	35 Units
Stories	1 Story

Exterior

Year Built	Built 2001
Effective Year Built	Effective 2001
Lot Area	141,027 sqft (3.23 acres)

Location & Zoning

Street Address	20 WILLIAM ST
City	WELLESLEY HILLS
State	MA
Zip	02481-4103
Property Category	Commercial
Property Type	Commercial > Office > Office Building
Local Zoning Code	BD
Jurisdiction	WELLESLEY MA
Township / Civil Division	WELLESLEY
Census Block Group	1
Census Block	1001
Census Tract	404100

Owner

Source: Norfolk County and Wellesley Town records, as of October 20, 2026

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

Owner of Record	2 Company Names on Record
Mailing Address	197 CLARENDON ST, BOSTON, MA 02116-5010
Owner Type	Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Record Updated	Oct 29, 2026

Tax Assessment & Valuation

Source: Norfolk County and Wellesley Town assessment roll, as of April 14, 2026

Property Jurisdictions

Type	Name
State	Massachusetts
County	Norfolk County
County Subdivision	Wellesley Town
Unified School District	Wellesley School District (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026	$303,066.00 (-30.17%)	$29,800,000 (-29.41%) Building $29,800,000
2025	$433,991.00 (-7.21%)	$42,217,000 (-6.04%) Building $42,217,000
2024	$467,721.00 (-21.44%)	$44,930,000 (-13.6%) Building $44,930,000
2023	$595,400.00	$52,000,000 Building $52,000,000

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

Flood

Source: FEMA National Flood Hazard Layer, effective May 26, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	7 in force
Nearby Flood Claims	4 (2013–2021)
Claims Outside the SFHA	4 of 4
Most Recent Claim	Sep 2021 · Tropical Storm Henri

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

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

Wildfire Risk	Low lower than 99.1% of the US · lower than 98.7% of Massachusetts
Wildfire Likelihood	Under 0.01% annual chance
Exposure	None beyond 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	WELLESLEY WATER DIVISION serves 29,550 people · EPA ID MA3317000
Water Source	Purchased surface water from several systems
Last State Inspection	Jun 2025
Lead	4 ppb (2025) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	1 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. This system sells water to local utilities; the supplier billing this address may be one of them.

Internet Providers

Source: FCC Broadband Data Collection, based on 352 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Verizon Fiber	2,300 / 2,300
Xfinity Cable	2,000 / 2,000
Astound Broadband Cable	1,500 / 50
T-Mobile Fixed Wireless	100 / 20