Nassau County  »  11545  »  William Ave  »  21 William Ave

21 William Avenue, Glen Head, NY 11545 - Property report

Also known as: 21 William Ave

Property image for 21 William Avenue, Glen Head, NY 11545
static Mapbox map

Property type

One Family Year - Round Residence (210.01)

Year built

1954

Acreage

0.206

Sale price

$690K

General information

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Address
Primary address
21 William Avenue
ZIP code
11545
County
Nassau
Town/City
Oyster Bay
Village (SWIS code)
None (unincorporated town)
Parcel ID
21-227-16

Owner

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Sales
Sale date
11/25/2020
Sale price
$690,000
Arm's length
Tax
Tax year
2026
Current property tax
$2,765
Tax class
Zoning & Use
Zoning
R1-7
Building
Property type
One Family Year - Round Residence (210.01)
Building sq. ft.
2,027
Buildings on lot
1
Stories
1.5
Year built
1954
Rooms
9
Bathrooms
3
Exterior wall
Frame
Building style
Cape
Basement
Full
Attic
None
Fireplaces
1
Heating type
Central
Heating system
Hot water
Lot
Acreage
0.206
Topography
Level
Land
Primary site

Area overview

Walk score
71 /100.  Very Walkable
Transit score
0 /100.  Minimal Transit
Bike score
48 /100.  Somewhat Bikeable

Data provided by: Walk Score®

School district
3001

View more such as transportation, nearby schools and risk designations.

Ownership

Ownership information for 21 William Avenue, Glen Head, NY

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 21 William Avenue, Glen Head, NY 11545

Sale date Sale price Buyer name Seller name
11/25/2020 $690,000 XXXXXXXXXXXX XXXXXXX; XXXXXXXXXXXX XXXXXXXXXXX XXXXXXXX XXXXXXXX X XXX; XXXX XXXXXXX XXX

*Most recent sale on record for this property.

More about Nassau County property records.

Title documents

Date Type Amount Party 1 Party 2
02/16/2021 - R Other
(Mortgage Satisfaction)		 XXXXXXXX XXXXXXXX X XXXXXXXXX
01/22/2021 - R Other
(Mortgage Satisfaction)		 XXXXXXXX XXXXXXXX X XXX
12/16/2020 - R
11/25/2020 - D		 Deed XXXXXXXX XXXXXXXX X XXX XXXXXXXXXXXX XXXXXXX
12/16/2020 - R
11/25/2020 - D		 Mortgage
(Fixed Rate)		 XXXXXXXXXXXX XXXXXXX XXXXX XXXXXXXX XXXXXXXX XXX
02/25/2016 - R
11/24/2015 - D		 Deed XXXXXXX XXXXXXX & XXXXXXX XXXXXXXX XXXXXXXX X

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 21 William Avenue, Glen Head, NY

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2026
Property tax
$2,765
Recent tax assessments
Market value
$670,000
Assessed value
$670
Transitional assessed value
Exemptions

More about Nassau County Property Taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Market value Assessed value Tax rate Property tax Y-o-Y change
2026 $670,000 $670 412.662 $2,765 +4.32%
2025 $693,000 $693 382.439 $2,650 -84.94%
2024 $729,834 $691 2546.008 $17,593 +471.39%
2023 $729,000 $729 422.358 $3,079 -0.66%
2022 $729,000 $729 425.149 $3,099 -86.14%
2021 $723,000 $723 3094.015 $22,370 +20.37%
2020 $569,200 $1,423 1305.982 $18,584 +5.72%
2019 $569,200 $1,423 1235.353 $17,579 +5.31%
2018 $569,200 $1,423 1173.048 $16,692 +2.92%
2017 $569,200 $1,423 1139.815 $16,220 +8.74%
Permits

Permit information for 21 William Avenue, Glen Head, NY

No recently recorded permits for this property.

Neighborhood

Risk

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FEMA flood zones

FEMA flood zones
X

Transportation

Daily traffic map
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Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
North Shore Middle School 9 Public K-8 646 0.27
North Shore Senior High School 9 Public K-5, 9-12 764 0.29
Glen Head Elementary School 10 Public K-5 371 0.31
Glenwood Landing Elementary School 9 Public K-5 427 0.59
Sea Cliff Elementary School 8 Public K-5 343 1.01
Tiegerman Elementary School NR Private 1-5 136 1.66
All Saints Regional Catholic School NR Private PK-8 166 1.86
All Saints Regional Catholic School NR Private PK-8 166 1.86
Connolly School 3 Public 3-5 305 1.96
Harbor Hill School 7 Public K-5 584 1.97
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
North Shore Middle School 9 Public K-8 646 0.27
All Saints Regional Catholic School NR Private PK-8 166 1.86
The Green Vale School NR Private PK-8 417 2.13
Robert M Finley Middle School 5 Public 6-8 710 2.50
Friends Academy NR Private PK-12 765 2.69
Carrie Palmer Weber Middle School 7 Public 6-8 1,216 2.87
St. Peter of Alcantara School NR Private PK-8 162 2.92
Vincent Smith School NR Private 2-12 46 3.03
Roslyn Middle School 8 Public 6-8 766 3.63
Locust Valley Middle School 8 Public 6-8 472 4.11
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
North Shore Senior High School 9 Public K-5, 9-12 764 0.29
Paul D Schreiber Senior High School 9 Public 9-12 1,613 2.64
Friends Academy NR Private PK-12 765 2.69
Roslyn High School 9 Public 9-12 1,035 2.97
Vincent Smith School NR Private 2-12 46 3.03
North Shore Day School NR Private 0 3.03
Glen Cove High School 5 Public 9-12 1,050 3.13
Portledge School NR Private PK-12 522 3.44
Locust Valley High School 9 Public 9-12 629 4.11
Long Island Lutheran Middle & High School NR Private 6-12 439 4.32

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 21 William Avenue, Glen Head, NY

16 William Ave, Glen Head 4 Roosevelt St, Glen Head 8 Roosevelt St, Glen Head 1 Todd Dr, Glen Head 22 Roosevelt St, Glen Head 10 Roosevelt St, Glen Head 14 Roosevelt St, Glen Head 5 Todd Dr, Glen Head 36 Roosevelt St, Glen Head 1 Magnolia Pl, Glen Head 13 Magnolia Pl, Glen Head 3 Magnolia Pl, Glen Head 1 A Magnolia Pl, Glen Head 15 Dumond Pl, Glen Head 7 Magnolia Pl, Glen Head 3 Ellen CT, Glen Head 16 Roosevelt St, Glen Head 10 Magnolia Pl, Glen Head 30 Glen Head Rd, Glen Head 17 William Ave, Glen Head

Nearby ZIP codes for 21 William Avenue, Glen Head, NY

11501, Nassau County, NY 11507, Nassau County, NY 11514, Nassau County, NY 11542, Nassau County, NY 11547, Nassau County, NY 11548, Nassau County, NY 11560, Nassau County, NY 11568, Nassau County, NY 11576, Nassau County, NY 11577, Nassau County, NY 11579, Nassau County, NY 11590, Nassau County, NY 11596, Nassau County, NY 11709, Nassau County, NY 11732, Nassau County, NY 11753, Nassau County, NY 11765, Nassau County, NY 11791, Nassau County, NY 11801, Nassau County, NY

Frequently asked questions

What is the year built for 21 William Avenue, Glen Head, NY 11545?

The development at 21 William Avenue, Glen Head, NY 11545 was built in 1954.

What is the total square footage of 21 William Avenue, Glen Head, NY 11545?

21 William Avenue, Glen Head, NY 11545 has a total of 2,027 square feet.

When was 21 William Avenue, Glen Head, NY 11545 last sold and what was the sale price?

21 William Avenue, Glen Head, NY 11545 was last sold on 11/25/2020 for $690,000.

What is the assessed value of 21 William Avenue, Glen Head, NY 11545?

21 William Avenue, Glen Head, NY 11545 is currently assessed at $670.

What are the property taxes for 21 William Avenue, Glen Head, NY 11545?

The property taxes for 21 William Avenue, Glen Head, NY 11545 total $2,764.

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