I tried to do it a few years ago (condo building). Most installers wouldn't touch buildings with more than 2 floors (we have 5). I assume it's an insurance issue, but was super weird to me since SF has so many buildings (even SFHs) taller than 2 floors.
I did find an installer who claimed they'd do it, but after a site visit -- where the guy taking measurements said everything looked fine -- my sales rep emailed to say they were dropping me as a prospective client, and bizarrely refused to tell me why when I asked.
Then NEM3 took effect and solar-only (with no battery storage) became financially infeasible. I should look around again, probably, since battery prices have gone down... though I'll probably have to wait until reasonable people are in power again nationally, who restore financial incentives for this stuff.
the best escape valve against PG&E and Edison is installing solar panels and a battery.