What’s my right ? Any advice please?

Hi I have food business and my landlord is try to sale the building and they put sign on window (probably bigger then A1size) that building for sale and it’s looks so ugly and looks like we are selling the business ( it says land and building only but very small) I believe that it might affect our business , is my... show more Hi I have food business and my landlord is try to sale the building and they put sign on window (probably bigger then A1size) that building for sale and it’s looks so ugly and looks like we are selling the business ( it says land and building only but very small) I believe that it might affect our business , is my landlord allow to put sign on window ?
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