Local zoning codes established by a town, village, or city control and establish what you can do with your property, as well as the size and boundaries of structures. Those codes can change over time, resulting in potential problems for property owners. This is increasingly an issue for many owners as localities look to prohibit certain uses of property because of growing concerns of conservation, exposure risks, etc. However, owners are often protected from a change that makes a pre-existing use illegal because they are considered to have a “prior non-conforming use.”