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MLS ID KEY1062551Last updated Oct 25, 2026

Single Family

18 20th Avenue

Active · Oyster Bay · Nassau County, NY 11579

Bedrooms
4 Beds
Bathrooms
3 Baths
Year built
1898
Est. monthly taxes
$1,474.92
Property gallery0 / 44
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About this home

There's something special about a home that welcomes you before you even enter! At 18 20th Avenue, the beautiful mahogany front porch sets the tone for this exceptional Colonial, offering timeless character, modern luxury, and remarkable privacy in the beautiful Village of Sea Cliff. Originally built in 1898 and completely rebuilt in 2017 by a builder for his own residence, this thoughtfully designed home combines classic architecture with modern conveniences and quality craftsmanship. Inside, rich hardwood floors, solid wood doors, and sun-filled living spaces lead to an expansive dining area, inviting family room with acoustic pocket doors, and chef-inspired kitchen featuring quartz countertops, a 36-inch Thor gas range, wine refrigerator, and reverse osmosis water filtration. A custom mudroom adds everyday convenience. Upstairs, the primary suite offers a spa-like experience with a steam shower, radiant heated floors, marble double vanity, and 12-jet soaking tub. Three additional bedrooms and a dedicated laundry room complete the second level, while a semi-finished lower level provides additional flexible space for recreation, storage, and everyday needs, along with a second washer and dryer for added convenience. Smart-home features include Hunter Douglas motorized blinds, integrated lighting and security systems, and built-in speakers. Additional improvements include Hardie siding, energy-efficient windows, two-zone central air conditioning, and a generator hookup. Situated on just under a quarter acre, the fully fenced property is beautifully landscaped, offering exceptional privacy, multiple yard areas, a patio, and a deck ideal for entertaining. Landscape lighting and string lights create a wonderful outdoor atmosphere, while sunset views add to the setting. An oversized, recently renovated two-car garage with epoxy floors, a spacious driveway, and an EV charger provide ample parking and convenience. Just moments from Sea Cliff's waterfront, beaches, parks, restaurants, and shops, this distinctive home offers a blend of historic character, modern comfort, and private outdoor living.

Listing snapshot

Days on site
14 days
Listed on MLS
Oct 14, 2026
Full baths
2
Half baths
1
Annual property tax (MLS)
$17,699
Tax year
2026
Area source (MLS)
Appraiser
Listing brokerage
Douglas Elliman Real Estate
MLS ID
KEY1062551
Last updated
Oct 25, 2026

General features

Property type
Single Family
Property subtype
Single Family Residence
Year built
1898
Garage
Yes
Garage spaces
2
Parking
Detached, Driveway, Electric Vehicle Charging Station(s), Garage, Garage Door Opener, Oversized
Water source
Public
Sewer
Cesspool
Utilities
Electricity Connected, Natural Gas Connected, Water Connected

Interior features

Basement
Bilco Door(s), Partially Finished, Storage Space
Heating
Forced Air, Hot Water, Natural Gas, Radiant, Radiant Floor
Cooling
Central Air
Interior
Breakfast Bar, Built-in Features, Chandelier, Chefs Kitchen, Double Vanity, Eat-in Kitchen, Entrance Foyer, Formal Dining, High Ceilings, High Speed Internet, Kitchen Island, Natural Woodwork, Open Kitchen, Original Details, Pantry, Primary Bathroom, Quartz/Quartzite Counters, Recessed Lighting, Smart Thermostat, Soaking Tub, Sound System, Speakers, Storage, Walk-In Closet(s), Washer/Dryer Hookup, Wired for Sound
Appliances
Convection Oven, Dishwasher, Exhaust Fan, Freezer, Gas Oven, Gas Range, Microwave, Refrigerator, Stainless Steel Appliance(s), Tankless Water Heater, Washer, Water Purifier Owned, Wine Refrigerator
Flooring
Hardwood, Tile
Fireplace
No

Exterior features

Architectural style
Colonial
Construction materials
HardiPlank Type
Exterior
Garden, Lighting, Rain Gutters
Private pool
No

Schools (MLS)

Elementary school
Sea Cliff Elementary School
Elementary school district
North Shore
Middle school
North Shore Middle School
Middle school district
North Shore
High school
North Shore Senior High School
High school district
North Shore

School information is provided by the MLS. Confirm attendance eligibility with the school district.

Recent activity

  1. Listing updated from MLS
  2. First seen on this site
  3. MLS status changed

Location

Oyster Bay · Nassau County, NY 11579Show interactive map
18 20th Avenue

Oyster Bay · Nassau County, NY 11579

Google Maps directions

Estimate monthly payment

Loan detailsFixed-rate, fully amortizing loan. Edit the assumptions below; no market rate is supplied.
Property expenses (USD)
MLS amounts are prefilled when available and can be edited. Confirm what fees include. Unknown fee frequencies cannot be converted automatically.Property expenses: MLS values where available; missing values stay blank.

Estimated monthly principal & interest—

Monthly property taxNot provided

Monthly association / maintenance feesNot provided

Estimated monthly total of entered costs—

Excludes insurance, mortgage insurance, special assessments and lender fees. MLS taxes may reflect abatements or exemptions and can change.

Listing data is supplied by the MLS and may change without notice.