Received an offer for 85k, should I negotiate?

Hello all. Just for preface, I live in Vancouver BC Canada. I am currently employed as a coordinator but want to be a project manager. I receive an offer to be one for 85k but the high end of the posting range was for 100k. I am wondering should I even try to negotiate? I really want this job but I hear its common practice to negotiate prior to signing anything. How's the job market out there? Will they rescind my offer if I do this?