Here is a simple sign design for Realtors, based on the board game Monopoly. The sign itself is like a property space from the game, and there is a house at the top of the mast (could be a red hotel if this was a commercial property).
Note: a few Realtors have asked me if they could run with this. I think it’s mostly safe but I’m not a lawyer so proceed at your own risk.
Dave's Geeky Ideas 
you are the coolest person i’ve never met 🙂