523 E Putnam Ave, Cos Cob, CT 06807 Property Records

Greenwich Town property record for 523 E Putnam Ave, Cos Cob, CT 06807

Property Summary

Property Type	Office Building
Details	2 bd · 3.5 ba · 5,277 sqft · built 1832
Lot Size	0.48 acres (20,909 sqft)
Owner	Company Name on File
Last Sale	$1,400,000 (Jun 2008)
Tax Bill	$15,571 (2024)
Deeds & Mortgages	Jan 2026 Sale
Flood Zone	Zone X (minimal risk)
APN	`07-1287S`

Property Details

APN / Parcel Number

Primary APN	`07-1287S`
Alternative APNs	`GREE M:07 B:1287/S` `342/018`

Interior

Bedrooms	2 Beds
Full Baths	3.5 Baths
Half Baths	3 Half Baths
Total Rooms	10 Rooms
Units	12 Units
Stories	3 Stories
Building Area	5,277 sqft Total Area
Basement Area	1,428 sqft
Unfinished Basement	1,428 sqft

Exterior

Year Built	Built 1832
Effective Year Built	Effective 1832
Construction Type	Frame
Roof Type	Gable
Roof Material	Shingle
Lot Area	20,909 sqft (0.48 acres)
Garage Type	Detached
Parking Spaces	1 Parking Space

Location & Zoning

Account Number	342/018
Street Address	523 E PUTNAM AVE
City	COS COB
State	CT
Zip	06807-2506
Property Category	Commercial
Property Type	Commercial > Office > Office Building
Local Zoning Code	R-20
Legal Block	1287/S
Jurisdiction	GREENWICH CT
Township / Civil Division	GREENWICH
Census Block Group	2
Census Block	2010
Census Tract	10201

Owner

Source: Greenwich Town assessment roll, 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 File
Mailing Address	87 GREENWICH AVE, GREENWICH, CT 06830-5521
Owner Type	Company
Vesting	Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Sale	Jun 5, 2008 · Amount on Record
Deed Sale	Jun 5, 2008 · Amount on Record
Deed Book / Page	5633 / 35
Record Updated	Sep 20, 2026

January 2026: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	GREENWICH CT
Recording Date	Jan 5, 2026
Property Address	523 E PUTNAM AVE, COS COB, CT 06807-2506
Document Number	0008520-74
Book / Page	8520 / 74
Instrument Date	Dec 23, 2025
Instrument	30
Transaction Type	Transfer
Record Updated	Feb 23, 2026

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	87 GREENWICH AVE, GREENWICH, CT 06830-5521

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		$1,260,000 (-20.5%) Land $1,029,980 Building $230,020	$882,000 Land $720,986 Building $161,014
2024	$15,571.00 (-15.57%)
2023	$18,442.00 (+0.92%)	$1,584,870 (-) Land $1,354,850 Building $230,020
2022	$18,274.00	$1,584,870 Land $1,354,850 Building $230,020

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 96% of the US · lower than 94% of Connecticut
Wildfire Likelihood	Under 0.01% annual chance
Exposure	None beyond ember reach

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 328 locations within half a mile, as of December 31, 2025

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

May also be available: Frontier.

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