Man what a can of worms
One thing though, being from Colombian will hinder him rather than help him...
In a nutshell, unless he wants to get married or have a kid here, he's going to have to invest $100k+ in a business, and it is going to be a big legal pain in the ass. If he is retired and receives a retirement pension of any kind in excess of $1k/mo, there is a special clause for retirees as well.
As far as affordability goes, prices are skyrocketing everywhere and I can't wait until we catch up to the american recession