The cache is not at the posted coordinates. In order to find the cache you must complete the Historic Floral Park Adventure Lab.
https://adventurelab.page.link/cccv
This is the last spot on the tour of Historic Floral Park. At the coordinates you will find the historic marker for the Tyson Building. It was built in 1894 by George Tyson and is the oldest commercial building in Floral Park. It use to house the Post Office.
The original wood frame building burned down and was quickly replaced by Tyson with a brick one. As in the past the first floor houses local businesses including the Historical Society Museum and Archives while the second and third floors are apartments.
Across the street on the concrete pillars there is a sign prohibiting you from doing something. Add 3 to the number of letters in the first word to get F.
F= # of letters+3
The cache is located at:
N40 43.ABC
W 073 42.DEF