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15 Riverside Avenue, 
Mastic Beach, NY 11951

$699,999


4

Beds


3

Baths


2,364

Sq Ft


Single Family

Active

Listed by

Maralyn C. Diggin Cbr

Douglas Elliman Real Estate

Last updated:

October 14, 2026, 02:04 PM

MLS#

1059003

Source:

OneKey MLS

About This Home

15 Riverside Avenue

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- an ideal setup for mom, returning children, or guests Upstairs, 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

Home Facts

Single Family

3 Baths

4 Bedrooms

Built in 1988

Price Summary

699,999

$296 per Sq. Ft.

MLS #:

1059003

Last Updated:

October 14, 2026, 02:04 PM

Added:

6 day(s) ago


Rooms & Interior

Bedrooms

Total Bedrooms:

4

Bathrooms

Total Bathrooms:

3

Full Bathrooms:

2

Interior

Living Area:

2,364 Sq. Ft.


Structure

Structure

Architectural Style:

Hi Ranch

Building Area:

2,364 Sq. Ft.

Year Built:

1988


Lot

Lot Size (Sq. Ft):

10,890


Finances & Disclosures

Finances

Price:

$699,999

Price per Sq. Ft:

$296 per Sq. Ft.

Source:OneKey MLS
Copyright 2026 OneKey MLS. All rights reserved. Listings courtesy of OneKey MLS as distributed by MLS GRID . OneKey MLS provides content displayed here (“provided content”) on an “as is” basis and makes no representations or warranties regarding the provided content, including, but not limited to those of non-infringement, timeliness, accuracy, or completeness. Individuals and companies using information presented are responsible for verification and validation of information they utilize and present to their customers and clients. OneKey MLS will not be liable for any damage or loss resulting from use of the provided content or the products available through Portals, IDX, VOW, and/or Syndication. Recipients of this information shall not resell, redistribute, reproduce, modify, or otherwise copy any portion thereof without the expressed written consent of OneKey MLS.
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15 Riverside Avenue
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Sun, Oct 18
01:00 PM - 03:00 PM

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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.