10 Mason St, Greenwich, CT 06830 Property Records

Greenwich Town property record for 10 Mason St, Greenwich, CT 06830

Property Summary

Property Type	Bank, Financial Building
Details	23,994 sqft · built 1954
Lot Size	1.45 acres (63,162 sqft)
Owner	Company Name on Record
Last Sale	$13,500,000 (Jul 2025)
Tax Bill	$237,691 (2024)
Deeds & Mortgages	Jul 2025 Sale Jul 2025 Transfer
Flood Zone	Zone X (minimal risk)
APN	`01-2133S`

Property Details

APN / Parcel Number

Primary APN	`01-2133S`
Alternative APNs	`GREE M:01 B:2133/S` `284/100`

Interior

Total Rooms	1 Room
Stories	4 Stories
Building Area	23,994 sqft Total Area
Basement Area	5,721 sqft
Unfinished Basement	5,721 sqft
Elevator	Elevator

Exterior

Year Built	Built 1954
Effective Year Built	Effective 1954
Exterior Material	Glass
Construction Type	Concrete
Roof Type	Flat
Roof Material	Built-Up Asphalt
Lot Area	63,162 sqft (1.45 acres)

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	284/100
Street Address	10 MASON ST
City	GREENWICH
State	CT
Zip	06830-5431
Property Category	Commercial
Property Type	Commercial > Office > Bank, Financial Building
Local Zoning Code	CGB
Legal Block	2133/S
Jurisdiction	GREENWICH CT
Township / Civil Division	GREENWICH
Census Block Group	2
Census Block	2006
Census Tract	10600

Owner

Source: Greenwich Town records, as of June 25, 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	100 NORTHFIELD ST, GREENWICH, CT 06830-4618
Owner Type	Company
Vesting	Company

Deeds, Mortgages & Sale History

Date	Document
Jul 17, 2025	Deed, Transfer
Jul 17, 2025	Correction Deed

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jul 17, 2025 · Amount on Record
Deed Sale	Jul 17, 2025 · Amount on Record
Deed Document Number	20254187
Deed Book / Page	8459 / 149
Prior Transfer Date	Jul 1, 2025
Prior Transfer Doc	008459-143
Record Updated	Sep 20, 2026

July 2025: Deed, Transfer

Document Type	Deed
Jurisdiction	GREENWICH CT
Recording Date	Jul 17, 2025
Property Address	10 MASON ST, GREENWICH, CT 06830-5431
Document Number	008459-149
Book / Page	8459 / 149
Instrument Date	Jul 15, 2025
Instrument	4187
Transaction Type	Transfer
Record Updated	Nov 19, 2025

Transaction

Amount	Amount Recorded
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	100 NORTHFIELD ST, GREENWICH, CT 06830-4618

July 2025: Correction Deed

Document Type	Correction Deed
Jurisdiction	GREENWICH CT
Recording Date	Jul 17, 2025
Property Address	10 MASON ST, GREENWICH, CT 06830-5431
Document Number	008459-143
Book / Page	8459 / 143
Instrument Date	Jul 1, 2025
Instrument	4185
Record Updated	Jul 30, 2025

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	240 GREENWICH ST # AIM-1, AIM-1, NEW YORK, NY 10007-2470

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
2025		$19,232,220 (+9.36%) Land $8,918,980 Building $10,313,240	$13,462,554 Land $6,243,286 Building $7,219,268
2024	$237,691.00 (+16.15%)
2023	$204,641.00 (+0.92%)	$17,586,870 (-) Land $8,918,980 Building $8,667,890
2022	$202,777.00	$17,586,870 Land $8,918,980 Building $8,667,890

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	Low lower than 99.1% of the US · lower than 99% of Connecticut
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	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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