What if there was a law against it?
How could we survive a law against billing a sale message? How could people tell their neighbours they are on the move? How could cities walls be decorated with loud and noisy signs? I believe we wouldn’t. Someone along the way would go on to break the rule and would hang a sale sign for the simple fact that it would be the only one and that way it would be noticed and would grant a sale.
In other orders, we will have a long future ahead of us here at Portugal4Sale.
portugal4sale 
Hi!
This kind of messages on the buildings is noise visual … in my opinion, devalues the neighboring properties, that when purchasing their property, they believe in their investment.
It is wise to turn to real estate agents … yes, they should do this work… they are the professionals and experts. Or … if the owner wants to do it personally, there are other ways to do it!
Indeed. Meanwhile it allows us to collect and create an unique image of real estate DIY sale marketing, as it interacts with local community as a visual city landscape.