A classier/ upscale homeless person. Sans casas used to be in the work force and plan on re-entering soon, but have fallen on a bit of bad luck. They usually have the "pick-of-the-litter" spots (i.e. tents under the freeway or the newest boxes), their shopping carts have four wheels, and they usually get to skip lines at the shelter. Sans casas do not appear to be disease ridden and their signs are grammatically correct and free of spelling errors.
"If I don't make my next rent check, I'm definitely going to be sans casa for a while".