It drives me nuts my office landlord does not have solar, I’ve asked him a couple times about this and offered to pay more rent to compensate for the value.
There is no “low tier” pricing for commercial property, and our big windows that don’t open mean our power bill gets as high as $400 in the summer, and we keep the AC at around 75 most of the time. With the other tenants using even more, the building probably gets as high as $1200/mo in the summer.
The roof is easy to access and there are no large buildings or other obstructions. There are already power outlets up there. It is a perfect candidate. The only small downside is that the roof is flat so some sort of platform would have to be built at the right south-facing angle.