In order for the lot to be protected, the lot must meet all the requirements of M. G. L. Chapter 40A Section 6. The property owner must prove Protected Rights. You will need a copy of all of the lot in questions deeds AND ALL abutting lots deeds dating prior to 1975, or prior to the year in which the lot became non-conforming, forward to the present date. It is strongly recommended that you contact legal counsel for advice, as there are many legal issues that need to be addressed. If a lot is proven family dwelling only.