So I got an answer back today from University House. Much to my surprise, it was a personalized answer that agreed with me. Don't know if anything will come of it (letters are cheap, after all), but at least I got an answer. Text is below.
I received your email concerning the office at Mustang Village II being closed during business hours. While I do not have specifics concerning the reason, I do agree with you that we need to do better. I will speak with the onsite staff to determine the need for additional staffing and whether this was due to not enough people in general or a result of a temporary staffing issue. Thank you for your inquiry and concern.