Wow, Betty, I would check with the city and their planning/building division. I know here, we are only allowed to build 5 feet from any wall. I would get a map of the property to tell you where the property lines are as well. You can get that from the city too. They have detailed maps at their office of each lot in the city. I would ask your local building department what your options are. They are there to help you as well. He may have built the shed without a permit and the city may require one for that. Some cities do, some do not. But, you are best to start there. Are you working with an agent? They certainly should be able to help you as well. If you have any more concerns or questions, feel free to let me know!
Keller Williams Realty