I think why you want to know the Binance office do you want to go there to see it in person? Binance is a popular exchange and they might keep it a secret, and I've seen a number of articles that Binance's office is in Shanghai, but that was also denied by Binance so I don't know which is true.
I think he was just curious and wanted to make sure that the money he put in was safe. but it is also true of the binance party, to avoid something undesirable, the binance party keeps it a secret and makes it more privacy.