the university modifies it

[arzgol]

Students will study in the office building which is across the compus after the university modifies it, classes will take place in the office building.

Shall I use passive?

Thank you for your reply.

[5jj]

Students will study in the office building which is across the compus (?) after the university modifies it, classes will take place in the office building.

Shall I use passive?.

I do not understand why you would even think of using a passive here. I assume that whoever produced this wished to convey something like this message:

Students will study in the office building which is opposite the main campus after the university has converted it . Classes will then be held in that building.