New construction (including substantial remodeling, conversion, rebuilding, enlargement, extension, or major structural improvement of existing building, but not including ordinary maintenance or remodeling or changes necessary to continue occupancy) shall not be authorized or conducted within the development area except on prior certification by the Administrator of General Services that the construction is, or may reasonably be expected to be, consistent with the carrying out of the development plan described in section 5(a) of the Pennsylvania Avenue Development Corporation Act of 1972 (Public Law 92–578, 86 Stat. 1269).