I don't know of any online Directories for Queens County. Did you view family on Ancestry in 1880 or 1900 or 1892 census? It should show a house number and may have street. Queensborough Library will do a Directories look up for a small fee. If you find he exact business address, which may be the same as his home, let me know.
What is his DOB, and place of birth? Wife's name?
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