Richard (and Feeshon too), Homeless comprise a wide segment of our society.  Children, unemployed, elderly and yes, many with mental health issues and/or additions.  Would you rather someone have a safe and warm environment or not? That in itself may reduce panhandling among other things. Couple this program with a program to help gain employment or get an education, both of which could be conducted in the building itself and perhaps even include some non-residents. 
 As to the "systems" being "so far gone", well Richard, that's why you gut the building, upgrade with green energy and make it a plus.  After all, the owner is obligated to participate in doing something about this "eyesore".  
 Have a heart folks. You'll feel better about yourselves and make others feel better about themselves. Like it or not we are all on this ship together.