Can I return books to a different library on campus than where I borrowed them?
Generally, yes, you can return anything borrowed from one branch of York University Libraries to any other branch. (Exceptions: anything on reserve must be returned to where you borrowed it, and CDs and DVDs borrowed from SMIL must be returned to SMIL. Books borrowed from Nellie Langford must be returned to Nellie Library) and MAPs must be returned to the Maps library.
See link for full details Returning Items.