We have a 12,400 sq ft building that was a hardware store being renovated to an auto parts store.No change of use.It currently is not sprinklered(I believe it should have been back in 1975 when it was built)I am going to require the building to be sprinklered because the fire area is over 12,000 sq ft.The occupant load is 400.Would a fire alarm system be required?If not, would strobes be required in the bathrooms?Any relevant code section would be appreciated.