You don't tell us where you are doing this but generally, there is no such thing as an owners permit for a commercial occupancy. You are required to hire properly licensed contractors to do everything.
Screw up the plumbing in this restaurant and people may die. Screw up the electric and people may die.
Let's say no one dies or is injured but you screwed up something that shuts down the shopping center, you pay for the losses of all the businesses there.
Let's say you don't get that t&p valve on the water heater right. The resulting explosion will relieve you of all financial responsibilities but the $ will be taken out of your estate.