Greenwich Town property record for 166 Mason St, Greenwich, CT 06830
| Property Type | Duplex |
|---|---|
| Details | 3 bd · 3 ba · 2,416 sqft · built 1920 |
| Lot Size | 0.11 acres (4,792 sqft) |
| Owner | Company Name on File |
| Last Sale | $1,250,000 (Jan 2014) |
| Tax Bill | $12,007 (2026) |
| Deeds & Mortgages | Mar 2017 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 01-1775S |
| Primary APN | 01-1775S |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Units | 2 Units |
| Stories | 3 Stories |
| Building Area | 2,416 sqft Living Area |
| Basement Area | 892 sqft |
| Unfinished Basement | 892 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1920 |
|---|---|
| Effective Year Built | Effective 1960 |
| Architectural Style | Duplex Single |
| Exterior Material | Wood Siding |
| Construction Type | Frame |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 4,792 sqft (0.11 acres) |
| Garage Type | Detached |
| Parking Spaces | 1 Parking Space |
| Cooling System | HVAC |
|---|---|
| Heating System | Hot Water |
| Heating Fuel | Gas |
| Account Number | 285/176 |
|---|---|
| Street Address | 166 MASON ST |
| City | GREENWICH |
| State | CT |
| Zip | 06830-6611 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | CGB |
| Legal Block | 1775/S |
| Jurisdiction | GREENWICH CT |
| Township / Civil Division | GREENWICH |
| Census Block Group | 1 |
| Census Block | 1003 |
| Census Tract | 10600 |
166 Mason St, a duplex, is owned by a company that bought it in January 2014.
Source: Greenwich Town records, as of October 21, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 166 MASON ST, GREENWICH, CT 06830-6611 |
| Owner Type | 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 | Name on Deed |
|---|---|
| Last Sale | Jan 17, 2014 · Amount on File |
| Deed Sale | Jan 17, 2014 · Amount on File |
| Prior Sale | Apr 7, 2005 · Amount on File |
| Deed Book / Page | 6698 / 240 |
| Transfer Doc | 7213-6 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | GREENWICH CT |
| Recording Date | Mar 9, 2017 |
| Property Address | 166 MASON ST, GREENWICH, CT 06830-6611 |
| Document Number | 7213-6 |
| Book / Page | 007213 / 000006 |
| Transaction Type | Transfer |
| Record Updated | Apr 11, 2017 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
The 2026 property tax bill for 166 Mason St was $12,007, up 4.5% from the year before.
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 |
|---|---|---|---|
| 2026 | $12,007.00 (+4.46%) | $1,145,270 (+23.14%) Land $769,860 Building $375,410 | $1,459,167 (+124.14%) |
| 2025 | $11,494.00 | $930,020 Land $605,710 Building $324,310 | $651,014 Land $423,997 Building $227,017 |
| 2024 | $11,494.00 (+6.21%) | ||
| 2023 | $10,822.00 (+0.92%) | $930,020 (-) Land $605,710 Building $324,310 | |
| 2022 | $10,723.00 | $930,020 Land $605,710 Building $324,310 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 166 Mason St in Zone X, an area of minimal flood risk.
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.
The area around 166 Mason St 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 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.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures