Gary,
The September 1973 date pertains to when VA as a state moved to a Uniform Statewide Code. Prior to that, each AHJ adopted their own regulations. So you need to check with Fairfax to determine what was in effect prior to September 1973. Further The Public Building Safety Regulations also apply to pre-USBC buildings. serving the public.
Hope this helps.
Sean P. Farrell
