You will never hear about it when it happens.
Unless they run the place like a prison, then they will have to kick out most of the people for vandalism, drug use, and other crimes. It will then costs thousands to repair the damage, not to mention their insurance premiums will be astronomical.
And on top of that most of them will not be paying rent of any kind to cover any costs!
Exactly. People who are homeless due to mental illness, substance abuse, etc., will not be able to maintain a decent place. Pick up after themselves? Cook and clean? These are everyday functions which are a part of normal daily living, and it is unlikely that any of the residents will be up to the task.
You forgot to mention the costs of defending themselves against lawsuits for rules requiring civilized behavior by branding them racists or discriminatory against low income people . . .