This is an abutter's appeal under G.L.c. 40B, § 17 from the refusal of the building inspector of the Town of Billerica, affirmed by an evenly divided Board of Appeals, to halt construction of a home on two adjoining and nonconforming lots. The case was tried jury-waived in two trial days on January 22-23, 2003. The issue is whether the Building Inspector properly permitted a "reconstruction" of an earlier structure located on one of the two nonconforming lots. It turns on the application of various provisions of the Billerica Zoning Bylaw to the facts of the case.