For instance he gives his sunglasses and jackets to homeless people. 

Tons of things go into poverty, and many things come out of poverty: crime, homelessness, perpetuating poverty, etc.I'm wondering how many of you have attempted to do something in your buildings to help alleviate some sort of poverty?

Change the locks and call social services to pick her up because she is homeless.  

We're getting bigger, and with growth comes more social problems - crime, homelessness, drug problems, etc...

From homeless to 2M worth of gross profits.

@Scott PassmanHi Scott,I have been doing some digging in regards to why there is so much homeless, or so it seems.Here is one Study:https://www.innovations.harvard.edu/sites/default/files/hpd_0203_wright.pdfIt's an interesting Read.It points out that there is a history of declining affordable housing areas that used to be there, called "Skid Row."

Perhaps serving him notice will get them to prioritize their rent unless they are about to be homeless.

You talked about your mom not answering for the appraisal, is she living in the house, if so that might complicate things as the judge may not wish to make her homeless. 

I guess make sure the places have been winterized or the utilities have been left on, if they've been left on and you have any homeless I would assume squatters.

You can also try homeless shelters and halfway houses.