> I've already narrowed it down to four buildings for you, so we can consider that all of those methods worked. What is your next move?

Subpoena the power, water & gas company, and look at apartments that have unusual power usage, coupled with almost zero water & gas usage. Especially look at apartments that don't have a spike in power usage in the morning & evening that corresponds to people having a regular commute.

I'm not sure how much power this equipment draws at idle - I'm assuming it's more idle at night, no need to send scammy SMS messages at 3am Eastern - but I'd wager you could track that.

Granted, it's not fast, but depending on how quickly the companies bend over backward for such a request & how good your interns are at using Excel, you might be able to get this done before sundown.

Maybe in a city like NYC with old apartments you could do that. It’s common for newer LEED buildings to use heat pumps and collective water/sewer billing. Power maybe but WFH is common these days too. And then you’d have to convince a judge that you’ve got something narrow enough.