I saw a "shell only" building that had 6 roll-up doors and the owner was planning on leasing out spaces. Since he did not know what tenants would want he left it completely open on the inside and advertised as "build-to-suite." What he did was have a house panel that served the exterior lighting and his office space. In addition he ran a single circuit to each potential bay with a single light, switch, and duplex receptacle. This turned out to be really convenient because he had light and power when he started putting up walls. After the tenant rented the space and proceeded with their TI they were responsible for getting their own meter and panel, suiting their needs. Once they had their own power he would shut that breaker off at the house panel. It will be very convenient for him when a tenant eventually moves out and shuts the power off to that unit, he can still turn a light on and plug something in off of his own power.