<p>^North Ave is pretty easy to get in. If someone is leaving through the push button open thing it is pretty easy to get in (I know from experience because I have friends who live there that I visit). And then you just have to wait for a student to open the door to the actual building. But who could have left them in? I don’t think there would be many people around well into break. But also you have to take an elevator up to your floor. So, they would have actually had to be in the elevator with him (13 or something floors) to be able to find him. If they just went to hang out on a random floor they would really have a chance at finding someone who was still living there.</p>