The advice previous in regards to a partnership with a non-practicing Jew was effectively to treat the situation as with a partnership with non-Jew vis a vis if they choose to work over Shabbos.
Can I assume that this consideration does not extend to the obligation to fix mezuzas on the premises? And that I would still be required to fix them on a carpentry workshop?
Thank you in advance
I agree with you.
If a Jew has a partnership with another Jew they have to put up a mezuzah. According to many poskim even if the partner is a non- Jew he has to put up a mezuzah, since it gives him protection. A carpentry workshop needs a mezuzah as it is a place that he uses regularly.
Chullin 135a, Y:D 286-1,