I have 200 amps to my house. I can't imagine they'd put 20 units on just 200 amps.
That was my point - when we rewired our house, we had two options for meters - 100a, or 200a, which required us to have a thicker cable drawn across the street to the house. Everything through one meter probably means the place is a few big space heaters from burning down.
I'm not an electrician though, I just play one on the internet.