These shops were on Main Street, Sayville.  Note the road is unpaved.  The platform in the lower center of the photograph was for easy access in and out of horse-drawn carriages.  The left portion of the building shown still exists as Kay Cameron Jewelers.  The sign on the window reads Henry E. Asmus, Real Estate, Fire & Life Insurance.  The sign across the alley on the far left says Aldrich's Coal & Wood Office.  The wooden building at extreme right was the home of Charles Dickerson's mother (Charles Dickerson was a local historian who wrote A History of the Sayville Community). 
Undated photograph from the collection of Sayville Library.