Your grandfather was probably talking about Piotrokowska Ulica (Piotrkowska Street), the most beautiful boulevard in Lodz. See https://en.wikipedia.org/wiki/Piotrkowska_Street
This street leads to Liberty/Indepedence Square, the center of town where there are many stores (and the state archives).
The yellow pages/business directory for Lodz is indexed on https://genealogyindexer.org/, but when I visited Lodz ten years ago, I found the business directory for the 1900-1920s in the Polish State Archives in Lodz. My grandfather had a large ad for his wholesale leather factory in the yellow pages. It was quite remarkable to see.
Hope this helps.