Rockland County  »  10983  »  Dederer St  »  20 Dederer St

20 Dederer Street, Tappan, NY 10983 - Property report

Also known as: 20 Dederer St

Property image for 20 Dederer Street, Tappan, NY 10983
static Mapbox map

Property type

One Family Year-Round Residence (210)

Year built

1927

Acreage

0.17

Sale price

$475,000

General information

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Access up-to-date information from property owner names to sales history, deeds, tax info, mortgages, development data, planimetric maps and more.

Address
Primary address
20 Dederer Street
ZIP code
10983
County
Rockland
Parcel ID
74.20-3-55

Owner

Find out who owns 20 Dederer Street, Tappan, NY 10983. Uncover corporate and individual owners with a free account.

Sales
Sale date
08/29/2016
Sale price
$475,000
Arm's length
Tax
Tax year
2025-2026
Current property tax
$6,866
Zoning & Use
Zoning
RG
Building
Property type
One Family Year-Round Residence (210)
Building sq. ft.
1436
Buildings on lot
1
Stories
2
Year built
1927
AC
Yes
Bedrooms
3
Bathrooms
2
Condition
Normal
Exterior wall
Composition
Building style
Old style
Kitchen
1
Basement
Full
Fireplaces
1
Heating
Hot water/steam
Fuel
Gas
First story sq. ft.
Second story sq. ft.
Lot
Acreage
0.17
Water
Comm/public
Sewer
Comm/public

Area overview

Walk score
53 /100.  Somewhat Walkable
Transit score
0 /100.  Minimal Transit
Bike score
52 /100.  Bikeable
School district
392401

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

Ownership

Ownership information for 20 Dederer Street, Tappan, NY

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

Sales history for 20 Dederer Street, Tappan, NY 10983

Sale date Sale price Buyer name Seller name
08/29/2016 $475,000 XXXXXXXX XXXXXXX XXXXXX XXXX
04/02/2008 $390,000 XXXXXX XXXX XXXXXX XXXXXX X, XXXXXXXX XXXXX

*Most recent sales on record for this property.

More about Rockland County property records.

Title documents

Date Type Amount Party 1 Party 2
08/29/2025 - R
08/13/2025 - D		 Mortgage XXXXXXXX, XXXXXXX X XX XXXX XX
09/12/2016 - R
08/29/2016 - D		 Deed XXXXXX XXXX XXXXXXXX XXXXXXX
04/14/2008 - R
04/02/2008 - D		 Deed XXXXXX XXXXXX X, XXXXXXXX XXXXX XXXXXX XXXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 20 Dederer Street, Tappan, NY

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

Current property tax
Tax year
2025-2026
Current property tax
$6,866
Base tax
$7,771
Recent tax assessments
Market value
$478,833
Land value
$36,000
Building value
$442,833
Assessed value
$152,700

More about Rockland 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
2025 $447,276 $152,700 50.8921 $7,771 +100.84%
2024 $428,571 $152,700 25.34 $3,869 -3.91%
2023 $407,417 $152,700 26.37 $4,027 -9.63%
2022 $358,114 $152,700 29.18 $4,456 +1.53%
2021 $363,139 $152,700 28.74 $4,389 -1.41%
2020 $350,310 $152,700 29.15 $4,451 -0.82%
2019 $335,604 $152,700 29.39 $4,488 n/a
Permits

Permit information for 20 Dederer Street, Tappan, NY

Issued date Permit number Permit type Sub type Valuation Finaled date Status
10/02/2025

*Most recent permit on record for this property.

Neighborhood

Risk

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FEMA flood zones

FEMA flood zones
X

Transportation

Daily traffic map
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Access the detailed traffic volume map for 20 Dederer Street, Tappan, NY 10983 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
William O Schaefer Elementary School NR Public K-2 576 1.31
Northvale Public School 9 Public K-8 533 1.67
St Dominic's School NR Private 1-11 77 1.85
Preschool Play House/Funland NR Private PK-K 88 2.40
Preschool Play House/Funland NR Private PK-K 88 2.40
Kindercare Learning Center #1519 NR Private PK, K-1 25 2.61
Kindercare Learning Center #1519 NR Private PK, K-1 25 2.61
Cottage Lane Elementary School 5 Public 3-5 629 2.66
Northern Valley Region Iii NR Public PK, K-12 197 2.88
Northern Valley Region Iii NR Public PK, K-12 197 2.88
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Northvale Public School 9 Public K-8 533 1.67
St Dominic's School NR Private 1-11 77 1.85
Rockland Children's Psych Center NR Public 7-12 16 2.15
South Orangetown Middle School 6 Public 6-8 633 2.82
Northern Valley Region Iii NR Public PK, K-12 197 2.88
Norwood Elementary School 9 Public PK, K-8 610 2.95
Charles Dewolf Middle School 9 Public 5-8 358 3.21
Clark Academy NR Public 7-12 103 3.27
Dobbs Ferry Middle School 8 Public 6-8 365 3.37
The Masters School NR Private 5-12 671 3.56
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Tappan Zee High School 9 Public 9-12 953 1.63
St Dominic's School NR Private 1-11 77 1.85
Rockland Children's Psych Center NR Public 7-12 16 2.15
Northern Valley Region Iii NR Public PK, K-12 197 2.88
Northern Valley Regional High School at Old Tappan 9 Public 9-12 1,002 2.88
Clark Academy NR Public 7-12 103 3.27
Dobbs Ferry High School 9 Public 9-12 455 3.37
Daytop Prep School NR Private 9-12 12 3.53
The Masters School NR Private 5-12 671 3.56
Irvington High School 9 Public 9-12 548 3.80

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

Neighbors for 20 Dederer Street, Tappan, NY

17 Dederer St, Tappan 16 Bauer St, Tappan 125 Tweed Blvd, Nyack 29 Christine Ln, Tappan 215 Western Hwy, Tappan 14 Dederer St, Tappan 22 Tea Pl, Tappan 9 Gage CT, Tappan 19 Dederer St, Tappan 25 Gage CT, Tappan 34 Dederer St, Tappan 12 Haring Ave, Sparkill 10 S Constitution Dr, Tappan 11 Dederer St, Tappan 21 Christine Ln, Tappan 14 Haring Ave, Sparkill 17 Gage CT, Tappan 10 Bauer St, Tappan 21 Edward St, Sparkill 2 S Constitution Dr, Tappan

Nearby ZIP codes for 20 Dederer Street, Tappan, NY

07620, Bergen County, NJ 07624, Bergen County, NJ 07626, Bergen County, NJ 07627, Bergen County, NJ 07640, Bergen County, NJ 07641, Bergen County, NJ 07647, Bergen County, NJ 07648, Bergen County, NJ 07675, Bergen County, NJ 10503, Westchester County, NY 10522, Westchester County, NY 10706, Westchester County, NY 10913, Rockland County, NY 10960, Rockland County, NY 10962, Rockland County, NY 10964, Rockland County, NY 10965, Rockland County, NY 10968, Rockland County, NY 10976, Rockland County, NY 10994, Rockland County, NY

Frequently asked questions

What is the year built for 20 Dederer Street, Tappan, NY 10983?

The development at 20 Dederer Street, Tappan, NY 10983 was built in 1927.

What is the total square footage of 20 Dederer Street, Tappan, NY 10983?

20 Dederer Street, Tappan, NY 10983 has a total of 1,436 square feet.

When was 20 Dederer Street, Tappan, NY 10983 last sold and what was the sale price?

20 Dederer Street, Tappan, NY 10983 was last sold on 08/29/2016 for $475,000.

What is the assessed value of 20 Dederer Street, Tappan, NY 10983?

20 Dederer Street, Tappan, NY 10983 is currently assessed at $152,700.

What are the property taxes for 20 Dederer Street, Tappan, NY 10983?

The property taxes for 20 Dederer Street, Tappan, NY 10983 total $7,771.

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