Active
15 Riverside Avenue
Mastic Beach, NY, 11951
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AN INTRODUCTION
A closer look.
Breathtaking waterfront views and peaceful sunsets set the stage for this updated 4 Bedroom, 2.5 Bath Hi-Ranch on Poospatuck Creek, with direct access to the bay. The first level features updated flooring, Led lighting, summer kitchen, spacious living room, bedroom, ample storage and sliders to the deck, Cathedral ceilings and hardwood floors create a bright and open feel. This Main level offers two generously sized bedrooms, and a spacious primary with walk in closet and half bath. The remodeled kitchen features quartz countertops, while the living room with fireplace and an oversized picture window showcases the yard and water views. Sliders lead to the upper deck, the perfect place to relax, unwind and savor those spectacular sunsets. Outside the home shines while you enjoy your private dock and a place to launch kayaks and paddleboat. From Poospatuck head to the bay for a day of fishing or simply enjoying life on the water. NEW : 2025/2026 Trex decking on Upper and Lower Level, New Oil tank, New Gutters And Gutter guards
Property overview
- Property type
- Single Family Residence
- Architecture
- Hi Ranch
- Condition
- Updated/Remodeled
- Year built
- 1988
- Lot size (sq ft)
- 10,890
- Status
- Active
- Listed
- 2026-10-13
- MLS number
- KEY1059003
Interior & comfort
- Interior features
- First Floor Bedroom, First Floor Full Bath
- Appliances
- Dishwasher, Refrigerator
- Heating
- Oil
- Cooling
- Central Air
Outdoors & amenities
- Parking
- Driveway, Garage
- Garage spaces
- 2
- Waterfront
- Canal Access, Creek, Water Access, Waterfront
Schools & location
- Postal town
- Mastic Beach
- County
- Suffolk County
- School district
- William Floyd
- Elementary school
- Tangier Smith Elementary School
- Middle school
- William Paca Middle School
- High school
- William Floyd High School
Taxes & utilities
- Annual property taxes
- $8,497
- Tax year
- 2026
- Association
- No
- Water
- Public
- Sewer
- Cesspool
Listing courtesy of Douglas Elliman Real Estate · 516-681-2600
MLS #KEY1059003 · Active

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