non-permitted upgrades and Occupancy/Use Permit

[Bobby Burches]

I recently came upon a property being sold in Baltimore, MD that has had an upgraded HVAC, Water heater, and electric panel installed. I checked the Baltimore permits site and there have been no permits pulled. This property has no Usage and Occupancy Permit. How would these non-permitted upgrades affect my ability to get an Occupancy Permit? I'd obviously offer