| Primary address | 9 Knollwood Avenue, Bayville |
| Zip code | 11709 |
| County | Nassau |
| Town/City | Oyster Bay |
| Village (swiss code) | Bayville |
| Parcel ID | 29-85-25 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Building sqft | 1,317 |
| Building class | One Family Year - Round Residence (210.01) |
| Land | Primary site |
| Topography | Level |
| Acreage | 0.115 |
| Buildings on lot | 1 |
| Year built | 1954 |
| Stories | 1 |
| Style | Cape |
| Rooms | 5 |
| Bathrooms | 1 |
| Attic | Full |
| Basement | Full |
| Exterior wall | Alum/Vinyl |
| Heating type | Central |
| Heating system | Hot water |
| Fireplace | 1 |
| Zoning district | Register (See more on map) |
| School district | Bayville |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
9 Knollwood Avenue, Bayville, NY 11709 was built in 1954 and has a total of 1,317 square feet.
What is the assessed value of 9 Knollwood Avenue, Bayville, NY 11709 and the property tax paid?Assessed at $394, the tax amount paid for 9 Knollwood Avenue, Bayville, NY 11709 is $8,030.
When was 9 Knollwood Avenue, Bayville, NY 11709 last sold and what was the last sale price?9 Knollwood Avenue, Bayville, NY 11709 was last sold in 09/30/2011 for $410,000.
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
Create a free account to view the complete sales history for 9 Knollwood Avenue, Bayville, including title documents, transfer conditions, mortgages and liens.
| Purchase date | Purchase price | Buyer name | Seller name |
|---|---|---|---|
| 09/30/2011 | $410,000 | Register | Register |
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for 9 Knollwood Avenue, Bayville, NY 11709. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2026 |
| Base tax | $8,031 |
| Current property tax | $7,238 |
| Tax class | Register |
| Market value | $394,000 |
| Assessed value | $394 |
Here's the assessment & property tax history for 9 Knollwood Avenue, Bayville, including the evolution of the total tax rate and corresponding property tax.
| Year | Market value | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|---|
| 2026 | $394,000 | $394 | 2038.267 | $8,031 | +3.84% |
| 2025 | $387,000 | $387 | 1998.347 | $7,734 | -7.88% |
| 2024 | $409,000 | $393 | 2136.237 | $8,395 | -9.91% |
| 2023 | $417,000 | $417 | 2234.706 | $9,319 | -5.16% |
| 2022 | $409,000 | $409 | 2402.402 | $9,826 | -10.66% |
The complete history of permits filed for 9 Knollwood Avenue, Bayville, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
Create a free account to unlock extended information for 9 Knollwood Avenue, Bayville, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
Access the detailed traffic volume map for 9 Knollwood Avenue, Bayville to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Bayville Elementary School | NR | Public | K-2 | 179 | 0.26 |
| Bayville Intermediate School | 7 | Public | 3-5 | 190 | 0.37 |
| Mill Neck Manor School For The Deaf | NR | Private | PK, K-11 | 116 | 1.63 |
| Mill Neck Manor School For The Deaf | NR | Private | PK, K-11 | 116 | 1.63 |
| Mill Neck Manor School for Deaf Child | NR | Private | PK, K-12 | 0 | 1.69 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mill Neck Manor School For The Deaf | NR | Private | PK, K-11 | 116 | 1.63 |
| Mill Neck Manor School for Deaf Child | NR | Private | PK, K-12 | 0 | 1.69 |
| Mill Neck Manor School for the Deaf | NR | Private | PK-12 | 106 | 1.76 |
| Locust Valley Middle School | 8 | Public | 6-8 | 472 | 1.83 |
| Portledge School | NR | Private | PK-12 | 522 | 2.70 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mill Neck Manor School For The Deaf | NR | Private | PK, K-11 | 116 | 1.63 |
| Mill Neck Manor School for Deaf Child | NR | Private | PK, K-12 | 0 | 1.69 |
| Mill Neck Manor School for the Deaf | NR | Private | PK-12 | 106 | 1.76 |
| Locust Valley High School | 9 | Public | 9-12 | 629 | 1.83 |
| Portledge School | NR | Private | PK-12 | 522 | 2.70 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 9 Knollwood Avenue, Bayville.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 25 Baldwin Blvd, Bayville | 1,824 | ||
| 9 Peter Ave, Bayville | 1,041 | 04/30/2016 | |
| 11 Peter Ave, Bayville | 1,575 | 09/17/2025 | $840,000 |
| 30 Baldwin Blvd, Bayville | 1,188 | 03/15/2004 | |
| 33 Baldwin Blvd, Bayville | 1,362 | ||
| 23 Baldwin Blvd, Bayville | 1,016 | 03/16/2010 | |
| 14 Dickerson Ave, Bayville | 2,478 | 07/17/2017 | |
| 7 Peter Ave, Bayville | 1,542 | 02/27/1997 | $177,000 |
| 37 Baldwin Blvd, Bayville | 2,301 | 03/13/1998 | $288,000 |
| 31 Baldwin Blvd, Bayville | 2,114 | 02/01/2001 | $389,900 |
| 16 Dickerson Ave, Bayville | 2,678 | 07/18/2019 | $641,500 |
| 2 Vine St, Bayville | 1,191 | 02/26/2019 | |
| 7 Knollwood Ave, Bayville | 2,485 | 07/31/2024 | $850,000 |
| 39 Baldwin Blvd, Bayville | 2,364 | 07/01/2025 | $987,000 |
| 5 Peter Ave, Bayville | 1,664 | 05/14/2001 | $275,000 |
| 6 Vine St, Bayville | 1,379 | 09/07/2011 | $515,000 |
| 18 Dickerson Ln, Bayville | 1,346 | ||
| 35 Baldwin Blvd, Bayville | 1,574 | 02/16/2021 | |
| 27 Baldwin Blvd, Bayville | 1,470 | 02/06/2025 | |
| 29 Plymouth Rd, Bayville | 1,050 | 11/04/2019 |