The greatest concentration of faculty offices are in the NRB Faculty Office suite (near the Information Center) and on the 8th floor of Building 13. There are a bunch scattered around the other floors, though, besides the offices in the CSI and EMI buildings.
Check your syllabus! Your professor will have their contact info listed there, including office location and office hours (when they set aside time to be available in their office for drop-in questions from students).
Note: if your professor is an adjunct (a part-time professor), they won't have an office on campus, and that will also be reflected on the syllabus. You'll just have to arrange a meeting time and location with them, either virtually or somewhere on campus.
