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Rosemarie Costa

Rosemarie Costa
Real Estate Agent (Associate Broker)
Mount Sinai NY

Associate Broker (NY: 30CO1119627)

34 years experience

REALTOR® 3 Active Listings Serves Suffolk County, NY
View on Realtor.com

Contact Information

Brokerage
Coldwell Banker American Homes
Office Address
276 Rte 25a
Mount Sinai, NY  11766
(Suffolk County)
Office Phone
631-331-3700
Office Fax
631-236-1452
Mobile
631-678-6200
Email
rcos**@*********.com
Show Email for $5

Service Areas

Central Islip: NY Bohemia: NY Sayville: NY Yaphank: NY North Bellport: NY Brookhaven: NY Terryville: NY Centereach: NY South Setauket: NY Selden: NY Lake Ronkonkoma: NY Gordon Heights: NY Coram: NY Setauket: NY Stony Brook: NY East Setauket: NY Port Jefferson Station: NY Poquott: NY Setauket-East Setauket: NY Old Field: NY Stony Brook University: NY Medford: NY Holtsville: NY Farmingville: NY Holbrook: NY St. James: NY Lake Grove: NY Middle Island: NY Rocky Point: NY Miller Place: NY Mount Sinai: NY Nesconset: NY Bayport: NY Patchogue: NY Davis Park: NY East Patchogue: NY Blue Point: NY North Patchogue: NY Belle Terre: NY Port Jefferson: NY Shoreham: NY Ronkonkoma: NY Smithtown: NY Head of the Harbor: NY Nissequogue: NY East Shoreham: NY Ridge: NY Commack: NY Hauppauge: NY Village of the Branch: NY Sound Beach: NY Wading River: NY Calverton: NY Jamesport: NY Northville: NY Riverhead: NY Eastport: NY Riverside: NY Aquebogue: NY Flanders: NY Northampton: NY Manorville: NY Baiting Hollow: NY Center Moriches: NY East Moriches: NY Moriches: NY Mattituck: NY Cutchogue: NY East Marion: NY Remsenburg-Speonk: NY Greenport West: NY Greenport: NY Laurel: NY Mastic: NY Shirley: NY Mastic Beach: NY New Suffolk: NY Orient: NY Peconic: NY Southold: NY Smith Point: NY East Yaphank: NY South Jamesport: NY Speonk: NY Westhampton: NY Upton: NY

About Rosemarie Costa

With over 28 years of experience in the real estate industry, this dedicated professional is committed to guiding clients through every step of their real estate journey, whether they are embarking on homeownership or looking to sell their property on the picturesque Long Island.

Leveraging advanced technology and comprehensive resources, this agent effectively generates interest in properties and provides potential buyers with the detailed information they seek. Their robust internet marketing strategy ensures extensive online visibility across leading real estate platforms, facilitating swift sales at optimal prices. Each listing is enhanced with high-quality professional photography and thorough property descriptions, catering to the preferences of today’s online home shoppers.

For expert guidance in the local real estate market, do not hesitate to reach out.

Suffolk County, NY Real Estate Market Analysis (Single Family Homes)

$1,963,002
Avg. Listing Price
From Rosemarie's portfolio
3.9 / 3.0
Avg. Beds/Baths
Typical property size
2,526 sf
Avg. Square Footage
Interior living space
6042
Active Listings
Current inventory

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Current Property Listings

As of 3/27/2026, Rosemarie Costa has 3 properties for sale in Mount Sinai and surrounding areas.

$499,990

Listed 2026-03-01

18 Windus Dr
Shirley, NY  11967

Beds: 5.0
Baths: 3.0
Sq Ft: 1,990
Lot: 10,019 sf
Single Family Map
View Full Details

$949,500

Listed 2025-11-05

20 Bunker Ln
Middle Island, NY  11953

Beds: 4.0
Baths: 3.5
Sq Ft: 2,850
Lot: 44,431 sf
Single Family Map
View Full Details

$599,990

Listed 2026-02-14

8 Shelley Ct
Middle Island, NY  11953

Beds: 4.0
Baths: 1.5
Sq Ft: 1,391
Lot: 16,988 sf
Single Family Map
View Full Details

$759,900

Listed 2025-03-11

W/S Rosewood
Rocky Point, NY  11778

Beds: 4.0
Baths: 2.0
Sq Ft: 2,000
Lot: 10,890 sf
Single Family Map
View Full Details

Current Property Rentals

Rosemarie Costa currently has no rental properties available in Mount Sinai and surrounding areas. Check back later.