The Allen Center ("CSE" or, less formally, "CSE1") is the original CSE building (the one connected to ECE with sliding doors on the front). Most office hours happen in the 'breakouts' the breakouts are large open spaces adjacent to the staircases (look for the area with a big whiteboard and seating).
The Gates Center ("CSE2") is the new building, across the street from the Allen Center (It's the one with orange siding with the lecture halls in the basement). We often have office hours in some of the smaller TA spaces on the first floor.
Parker's office is in Allen-- take stairs up to the second floor, turn right, walk until you see the first hallway on your right, and you'll be right next to Parker's office (room number CSE 204).
Links for zoom hours can be found on Ed on the pinned post of important links.