Douglas Elliman Real Estate
With years of experience helping buyers and sellers throughout Suffolk County, Rosanne D’Agostino is a trusted real estate agent specializing in Smithtown, Centereach, Coram, Setauket, Stony Brook, Mount Sinai, Port Jefferson, Port Jefferson Station, Westhampton Beach and surrounding Long Island communities. Known for her personalized approach and deep local knowledge, Rosanne guides clients through every step of the buying and selling process — from listing preparation and pricing strategy to closing and relocation.
As an Associate Broker with Douglas Elliman Real Estate, Rosanne combines professional expertise with a commitment to delivering exceptional results. Her focus on building lasting relationships and understanding the unique needs of each client ensures that every home transaction is smooth, successful, and stress-free.
Whether you’re buying your first home, selling a family property, or exploring investment opportunities in Suffolk County, Rosanne’s hands-on approach and in-depth market insight make her the go-to resource for navigating Long Island real estate with confidence.
Testimonials
"Rosanne was very devoted to helping us in the selling of our home. She communicated with us often. She was very caring."
-Margaret H., Client
"Rosanne is an extremely professional and honest real estate agent. We are the first time buyer and have a lot of confusions during the entire home buyer process. Although Rosanne is the listing agent, she is very helpful and responsive to us. She does care for both seller and buyer's need. Rosanne patiently guided and advised us during the whole process, so we won't feel frustrated and hopeless especially under the COVID-19 crisis. We are thankful that we are finally able to close out the transaction and get our new home with her help. We would 100% recommend Rosanne to anyone who want to sell or buy a home."
-L Geng, Client
"We had been dancing around selling our home for years and reached out to Rosanne many times. She never hesitated once to answer our questions or concerns. We finally decided to list on March 26, 2023 and within three days our house sold over asking price. Rosanne made the whole process seamless from listing, open house and closing. We are grateful for her help, professionalism, and hard work. We recommend her 100% to anyone looking to buy or sell."
-Candice K, Client
"Rosanne was simply delightful to work with. She was professional, friendly, personable and always responded promptly to my calls, texts and emails. During the process of selling my co-op, she always answered all my questions. I FOUND A BUYER IN 4 DAYS!!!! I would recommend her to anyone looking to buy or sell. Rosanne is a true professional."
-B Pollard, Client
Douglas Elliman Real Estate
$65+ Million in Sales
130+ Homes Sold
_______________
Rosanne D’Agostino is a Douglas Elliman real estate professional helping Long Island families buy and sell homes in Setauket, Centereach, Coram, Port Jefferson, and nearby communities. Known for her personal touch and deep local expertise, she also specializes in luxury real estate across Westhampton Beach, Hampton Bays, Quogue, East Quogue, and Southampton. With an exceptional eye for detail and a commitment to personalized service, Rosanne helps clients find their perfect Hamptons retreat or Port Jefferson Station home as well as achieve record results when selling. Blending Douglas Elliman’s prestige with her trusted “Rosanne Sold My House” approach, she delivers a seamless, elevated experience that feels both professional and personal.
