Just a few blocks off-campus and privately owned. There is a property manager mentioned as contact person listed on some of the rental advertisements. Real estate appraisal search should list actual property ownership.
The phone calls are said to have ended before 3. LE has given a several hour long window during which the murders may have been committed. In my opinion, it could even be possible that 2nd floor murders were already occurring while the phone calls were being placed, although that is just a possibility, IMO.