must be upgraded throughout percode. electrical and hvac work is required, and i think what's really important is when we have shoring that's required to preserve walls, floors and roofs to comply with the demolition calculations, this can often lead to unsafe conditions for workers who are working in the area of the shored components of the existing building. and demolition calculations are determined by the architect and approved by planning. site permits often approved without lots being completely vetted. there's a disconnect between architecture and engineering outsets. it's common to have unexpected field conditions, for example dry rot that would require additional demolition and may with the new filing of a permit trigger a conditional use hearing at planning. continuing with the inspection perspective, vertical additions, building permits for vertical additions are the most common source of unauthorized demolition. an estimated four or five instances of exceeding the approved demolition are substantiated annuall