Oh wow I am so sorry that happened to you ~ my signs have been up for a year now and never had an issue but I admit that I have never thought to put my sign anywhere but on my own property.

Is that property owned by the plaza and did you get permission to put it out there ... if not perhaps it was the owners of the property that removed it cause the 'tree people' might be paying to 'rent' that portion of their property or something and if you did not get that permission it could just be that? Can you go into the plaza stores and perhaps 'ask' if one of the employees removed the sign?

I find it very sad and disheartening to think that another provider would be so petty as to sabotage another businesses advertizing attempts to get further ahead themselves .... truly bad karma if that is the case and it will ultimately come back to bite her in the ass in some manner!