"Trondhjems Stempelfabrik" is not part of the address. Here is the official address in public records: https://seeiendom.kartverket.no/eiendom/5001/401/74/0/0 - see Adresser section.

I do not know this building myself, so I am unsure whether "Trondhjems Stempelfabrik" is the name of the building.