You published this photo of my father, Sholem Shrensky, and (it is assumed) of L. Gensheroff in issue 24, 2014 of The Cable in the hope that someone might know the location of the Gensheroff premises. Retired Detective Inspector Terry Abrahams astutely found, through the 1911 census, that the family of Isaac Gunscheroff (a close enough re-spelling of the name) resided in London at 9, Union Street, Mile End Old Town, and he kindly informed me of this fact.
My son Mark and I then Googled until we found that this Union Street (there are others) changed its name to Adler Street in 1913. Much of Adler Street was destroyed by the Luftwaffe bombings in World War Two and all of it had been rebuilt. Number 9 is now part of the 1-13 Adler Street complex.(https://surveyoflondon.org/map/?highlight=308.
See also http://www.londonancestor.com/maps/bc-milend.htm -- scroll down to get details of the change of name.)
Incidentally Terry Abrahams wrote about his family on page 11 of the same issue of The Cable.