Purchasing a property with no occupancy permits (Pittsburgh)

[Vlad K.]

I'm looking at a small multi-family in the Pittsburgh area. It's zoned correctly on the county website but the seller does not have occupancy permits for the units. If the seller is unwilling to do the work to get the permits, how much of a risk is it to purchase the place? What goes into securing an occupancy permit? What do inspectors look for? What is the worst case scenario (given that it's zoned correctly) as to what they might ask me to repair?