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There are places for homeless people to go, but many do not want to live in them because there are rules -- no drugs, no alcohol, etc. Compassion would be sending him to one of those. Giving him money or letting him hang out in the laundry room is enabling.

Now that you are engaged in this, I would keep the pressure on the apartment management: make your complaints respectfully and firmly in writing and figure out a way to prove you delivered these complaints. Escalate them above the apartment manager, if there is someone to escalate to (i.e. management company). If you can enlist your neighbors to make complaints or petitions as well. Keep calling the cops whenever you see this guy on the property. Video what you can, especially if you he is threatening you. Avoid him when you can, but be prepared to defend yourself and your girlfriend or whoever.