hvac and duct testing req's?

hey all-
a couple commercial hvac duct testing questions-

given-
10000 square foot office, multiple tenants, all ducts in unconditioned basement.2010 CMC.

1.if a single hvac unit that serves the whole building is replaced, is duct testing required?
2.if a single hvac unit, that serves 4000 square feet, is replaced is duct testing required?

thanks!
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