state - tennessee

My family, E, owns a small piece of commerical property that is being impacted on one side by a residence built several years ago. A person who was looking to rent E's property and make some renovations, checked with zoning officials and was told that the residence had made E's lot a zero lot line property.

Have E's rights been violated by this residence? What would be the recourse in this situation?

I do not know the impact of a zero-lot line property in your community. In some areas, that could mean nothing, and in others it could mean usage, building or zoning restrictions. My suggestion is to contact the local city or county zoning or land planning office to find out if this means anything to your property. Often times, older properties are grandfathered in in terms of usage and building and zoning.