Legal Question in Real Estate Law in Illinois

The doctrine of laches might apply and prevent the neighbor from being able to pursue this. You should see a lawyer to discuss things in person and to determine whether laches would apply.

And it may depend on how the 10' restriction was created -- for example if it was set up in documents that control the subdivision, they could be private restrictions intended so everyone in the subdivision would have the right to have them enforced directly or through a private homeowner association. Compare that to a zoning law where you don't complain to a homeowner association but instead to the city or village. On top of that the law relating to "mobile homes" is not always the same as for "real estate". Again, you need to see a lawyer if this is affecting you, and be prepared to provide more information!!! Good luck.