Dude how do you mine in apartment @ 70 KWh? I have 3 miners running at 1.2 KWh each and there is noise / heat problem. To be @ 70 KWh it would be 58 A741 running.  If you are running such a large mining operation from an apartment I am surprised none of your neighbors approached you about the noise.  I am currently running my miners under 3600 RPM so they're not very noisy but nevertheless you can hear across entire apartment, even front door if door to the room where they are is open.

I would talk to your building management first, tell them about suspicious activity and tell them you have expensive mining equipment and are concerned. Call electrical company and ask them about discounts for high electrical consumption, tell them you are a bitcoin miner.