Greenwich Town property record for 31 River Rd, Cos Cob, CT 06807
| Property Type | Medical Building |
|---|---|
| Details | 13,430 sqft · built 1965 |
| Lot Size | 0.78 acres (33,977 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $3,841,000 (Nov 2002) |
| Tax Bill | $66,719 (2025) |
| Deeds & Mortgages | Feb 2017 Line of Credit |
| Flood Zone | Zone AE (high risk) |
| APN | 08-3142S |
| Primary APN | 08-3142S |
|---|---|
| Alternative APNs |
|
| Total Rooms | 1 Room |
|---|---|
| Units | 3 Units |
| Stories | 2 Stories |
| Building Area | 13,430 sqft Total Area |
| Elevator | Elevator |
| Year Built | Built 1965 |
|---|---|
| Effective Year Built | Effective 1965 |
| Exterior Material | Brick |
| Construction Type | Steel Frame |
| Roof Type | Flat |
| Roof Material | Built-Up Asphalt |
| Lot Area | 33,977 sqft (0.78 acres) |
| Heating System | Forced Air with A/C |
|---|
| Account Number | 367/053 |
|---|---|
| Street Address | 31 RIVER RD |
| City | COS COB |
| State | CT |
| Zip | 06807-2152 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Medical Building |
| Local Zoning Code | WB |
| Legal Block | 3142/S |
| Jurisdiction | GREENWICH CT |
| Township / Civil Division | GREENWICH |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 10800 |
31 River Rd, a commercial property, is owned by a company that bought it in November 2002.
Source: Greenwich Town records, as of June 25, 2026
| Owner of Record | 2 Company Names on File |
|---|---|
| Mailing Address | 49 RIVER RD, COS COB, CT 06807-2725 |
| Owner Type | Company |
| Vesting | Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 27, 2002 · Amount on File |
| Deed Sale | Nov 27, 2002 · Amount on File |
| Deed Book / Page | 4044 / 231 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | GREENWICH CT |
| Property Address | 31 RIVER RD, COS COB, CT 06807-2152 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 7201-302 |
|---|---|
| Date | Feb 13, 2017 |
| Book Page | 7201/302 |
| Name | UNION SAVINGS BANK |
|---|---|
| Type | Bank |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Feb 1, 2047 |
The 2025 property tax bill for 31 River Rd was $66,719.
Source: Greenwich Town assessment roll, as of June 25, 2026
| Type | Name |
|---|---|
| State | Connecticut |
| County Subdivision | Greenwich Town |
| Unified School District | Greenwich School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $66,719.00 | $5,398,400 Land $1,739,290 Building $3,659,110 | $3,778,880 Land $1,217,503 Building $2,561,377 |
| 2024 | $66,719.00 (+6.21%) | ||
| 2023 | $62,816.00 (+0.92%) | $5,398,400 (-) Land $1,739,290 Building $3,659,110 | |
| 2022 | $62,244.00 | $5,398,400 Land $1,739,290 Building $3,659,110 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 31 River Rd in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective November 28, 2025
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | 11.0 ft |
| Flood Insurance Requirement | Required federally backed loans |
Values are read at the parcel center point; lenders make the official flood determination.
The area around 31 River Rd has no burnable land within ember reach, so its wildfire risk is not rated.
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.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 288 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 |
May also be available: Frontier, T-Mobile.
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