320 E Boston Post Rd, Mamaroneck, NY 10543 Property Records

Westchester County and Rye Town property record for 320 E Boston Post Rd, Mamaroneck, NY 10543

Property Summary

Property Type	Religious, Church, Worship (Synagogue, Temple, Parsonage)
Details	6,470 sqft · built 1885
Lot Size	1.26 acres (55,082 sqft)
Owner	2 Company Names on Record
Tax Bill	$3,092 (2025)
Flood Zone	Zone X (minimal risk)
APN	`554803 154.50-1-69`

Property Details

APN / Parcel Number

Primary APN	`554803 154.50-1-69`
Alternative APNs	`480315405000010690000000` `00006793000`

Interior

Stories	2 Stories
Building Area	6,470 sqft Gross Area
Basement Area	5,607 sqft
Unfinished Basement	5,950 sqft
Fire Sprinklers	Fire Sprinklers

Exterior

Year Built	Built 1885
Effective Year Built	Effective 2000
Lot Area	55,082 sqft (1.26 acres)
Lot Dimensions	211 ft deep x 130 ft wide
Porch	Slab

Utilities, Heating & Cooling

Cooling System	Central
Heating Fuel	Oil
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Account Number	00006793000
Street Address	320 E BOSTON POST RD
City	MAMARONECK
State	NY
Zip	10543-3702
Property Category	Other
Property Type	Other > Religious, Church, Worship (Synagogue, Temple, Parsonage)
Local Zoning Code	R-5 SFR
Legal Block	1
Legal Lot Number	69.000
Jurisdiction	WESTCHESTER NY
Township / Civil Division	RYE
Census Block Group	1
Census Block	1006
Census Tract	7402

Owner

Source: Westchester County and Rye Town records, as of May 14, 2026

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

Owner of Record	2 Company Names on Record
Mailing Address	816 UNDERHILL AVE, MAMARONECK, NY 10543-1517
Owner Type	Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Record Updated	Jun 8, 2026

Tax Assessment & Valuation

Source: Westchester County and Rye Town assessment roll, as of May 14, 2026

Property Jurisdictions

Type	Name
State	New York
County	Westchester County
County Subdivision	Rye Town
Municipality	Mamaroneck Village
Unified School District	Rye Neck Union Free School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2025	$3,092.00	$4,963,400 (-) Land $1,815,300 Building $3,148,100	$4,963,400 (-) Land $1,815,300 Building $3,148,100
2024	Additional exemption filed	$4,963,400 (-) Land $1,815,300 Building $3,148,100	$4,963,400 (-) Land $1,815,300 Building $3,148,100
2023		$4,963,400 Land $1,815,300 Building $3,148,100	$4,963,400 Land $1,815,300 Building $3,148,100

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 September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 35 policies
Community Rating System	Class 8 (10% premium discount)
Nearby Flood Policies	35 in force
Nearby Flood Claims	50 (1979–2024)
Claims Outside the SFHA	10 of 50
Most Recent Claim	Jan 2024 · other causes
Claims by Event	Hurricane Sandy, Oct 2012 · 14 claims Severe Storms And Inland And Coastal Flooding, Apr 2007 · 5 claims Coastal Storm, High Tides, Heavy Rain, & Flooding, Dec 1992 · 9 claims

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; 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	WESTCHESTER JOINT WATER WORKS serves 59,629 people · EPA ID NY5903435
Water Source	Surface water
Last State Inspection	Mar 2025
Lead	3 ppb (2026–2028) action level 15 ppb

Violations Reported to EPA

Water Quality	Failure to filter currently in violation since Jun 1993 Haloacetic acids resolved · Jul 2019
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None 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 334 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
T-Mobile Fixed Wireless	100 / 20