170 Mason St, Greenwich, CT 06830 Property Records

Greenwich Town property record for 170 Mason St, Greenwich, CT 06830

Property Summary

Property Type	Office Building
Details	22,304 sqft · built 1964
Lot Size	0.67 acres (29,185 sqft)
Owner	Company Name on Record
Last Sale	$1,146,500 (May 2019)
Tax Bill	$99,993 (2026)
Deeds & Mortgages	May 2019 Sale Mar 2018 Sale
Flood Zone	Zone X (minimal risk)
APN	`01-1473S`

Property Details

APN / Parcel Number

Primary APN	`01-1473S`
Alternative APNs	`GREE M:01 B:1473/S` `285/175`

Interior

Total Rooms	6 Rooms
Units	13 Units
Stories	2 Stories
Building Area	22,304 sqft Total Area
Basement Area	9,702 sqft
Unfinished Basement	9,702 sqft
Elevator	Elevator

Exterior

Year Built	Built 1964
Effective Year Built	Effective 1964
Construction Type	Steel Frame
Roof Material	Shingle
Lot Area	29,185 sqft (0.67 acres)

Utilities, Heating & Cooling

Heating System	Hot Water

Location & Zoning

Account Number	285/175
Street Address	170 MASON ST
City	GREENWICH
State	CT
Zip	06830-6644
Property Category	Commercial
Property Type	Commercial > Office > Office Building
Local Zoning Code	CGB
Legal Block	1473/S
Jurisdiction	GREENWICH CT
Township / Civil Division	GREENWICH
Census Block Group	1
Census Block	1003
Census Tract	10600

Owner

Source: Greenwich Town records, as of October 21, 2026

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

Owner of Record	Company Name on Record
Mailing Address	170 MASON ST, GREENWICH, CT 06830-6644
Owner Type	Company
Vesting	Company

Deeds, Mortgages & Sale History

Date	Document
May 9, 2019	Executor's Deed, Transfer UNKNOWN
Mar 29, 2018	Executor's Deed, Transfer

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	May 9, 2019 · Amount on Record
Deed Sale	May 9, 2019 · Amount on Record
Deed Document Number	20192888
Deed Book / Page	7504 / 135
Record Updated	Oct 29, 2026

May 2019: Executor's Deed, Transfer

Document Type	Executor's Deed
Jurisdiction	GREENWICH CT
Recording Date	May 9, 2019
Property Address	170 MASON ST, GREENWICH, CT 06830-6644
Document Number	7504-135
Book / Page	007504 / 000135
Instrument Date	May 8, 2019
Instrument	2888
Transaction Type	Transfer
Record Updated	May 28, 2019
Title Company	UNKNOWN

Transaction

Amount	Amount Recorded
Tax	$1,146.50
Amount Accuracy	Confirmed
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	170 MASON ST GREENWICH CT 068306644, GREENWICH, CT 06830-6644

March 2018: Executor's Deed, Transfer

Document Type	Executor's Deed
Jurisdiction	GREENWICH CT
Recording Date	Mar 29, 2018
Property Address	170 MASON ST, GREENWICH, CT 06830-6644
Document Number	7365-161
Book / Page	007365 / 000161
Instrument Date	Mar 6, 2018
Instrument	2146
Transaction Type	Transfer
Record Updated	Apr 16, 2018

Transaction

Tax	$0.00
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	PO BOX 1689 GREENWICH CT 068361689, GREENWICH, CT 06836-1689

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	Connecticut
County Subdivision	Greenwich Town
Unified School District	Greenwich School District (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026	$99,993.00 (-12.26%)	$9,537,710 (+3.43%) Land $4,515,420 Building $5,022,290
2025	$113,963.00	$9,221,030 (-) Land $4,255,720 Building $4,965,310	$6,454,721 Land $2,979,004 Building $3,475,717
2024	$113,963.00 (+6.21%)
2023	$107,296.00 (+0.92%)	$9,221,030 (-) Land $4,255,720 Building $4,965,310
2022	$106,318.00	$9,221,030 Land $4,255,720 Building $4,965,310

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 November 28, 2025

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

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 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	AQUARION-EASTERN FAIRFIELD COUNTY private · serves 351,756 people · EPA ID CT0150011
Water Source	Surface water
Last State Inspection	Jun 2025
Lead	Under 1 ppb (2026) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	24 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 501 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Optimum Fiber · Cable	8,000 / 8,000
Verizon Fiber · Fixed Wireless in parts of the area	980 / 880
Starlink Satellite	280 / 30
T-Mobile Fixed Wireless	100 / 20

May also be available: AT&T, Frontier.

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