Under G.L.c. 40A, §7 if a building permit has been issued and the property improved in accordance therewith, neither the structure nor the use permitted by the permit may be disturbed after the passage of six years. Also, if no building permit has been issued, but ten years have elapsed since the erection of the structures, they are protected under the statute. Note, however, that the court has held that under the wording of the statute the ten-year statute does not protect uses. See Lord v. Zoning Bd. Of Appeals, 30 Mass.App.Ct. 226, 567 N.E.2d 954 (1991).