We’ve had issues with signs over the years. Things became a lot better when we started implementing the following:
1) Passed a resolution to ban ‘for lease’ signs. Most people just go to an agency rather than scour the streets for available accommodation so that was a big scourge of visual clutter removed.
2) Specified a location where the signs may be placed. These are to the side of the building so residents are not faced with it every time walking down the front path (especially the huge picture ones so prevalent these days).
3) Emailed the estate agents (with photos) when they put signs in the wrong place or leave up ‘sold’ too long (pointing out that this building is a home for many people and not merely an advertising hoarding for them). I usually mention that it’s an EC rule of which the strata managers should have made therm aware. They are given 24 hours to move the sign.
Since doing this we have had far less trouble with signs going up and having them removed.