Also, the model unit had built-in air conditioner but his unit had big stupid air conditioner. so everything was different than the model unit.and today he said that there was a homeless sleeping at the hallway on his floorso they refused to show him the unit that he already made contract and no one is living, but the unit condition was terrible unlike model unit. is this legal?

Just get a homeless guy to hold your sign and dance in traffic rather than using fixed signs. 

Right now I am homeless!

A step down from our units is the homeless shelter or a tent in a friend’s back yard, and unfortunately our tenants rarely move out for a better living situation (in our 9% unemployment economy).

My trouble tenant used to be homeless maybe a year ago or so.

I hear stories of police officers and school teachers no longer able to live in these high-priced urban areas.Cities are grappling with how to deal with the homeless (Google "homeless bussing").

Natural DisasterA good chunk of the New Zealand population is at risk of being homeless because of earthquakes.

You can always go to homeless shelters or halfway houses and find someone. 

This person has now rendered all the others in the building basically homeless.

If you want to provide housing to people who can't find a place to stay otherwise, you may want to think about starting a shelter for the homeless, battered women, disabled VETs, or something similar.