small parcel into advertising vehicle

[Robert D.]

If you acquire a small parcel of land in residential part of the city and you want to put a sign on that parcel that will display advertisement of any legal businesses e.g. “we buy houses” or “New Printing Shop Just Opened” …would you need some sort of variance of a land use from the city ? do you have to convert the small parcel into commercial parcel ? anybody has any experience with that ? thanks for your help