You could buy a bunch of GPUs I guess. Take a look at
https://whattomine.com/ and see it for yourself. Assuming your electricity cost is 0 I guess anything could be profitable. But your apartment manager will definitely find out. Don't know how much they'll charge you, but I don't think it is worth the risk. Staking might be better imo.
Thx for mentioning this site. I will take a look at it! Yeah, any setup would be kinda profitable, but I also don't want to waste money in not effcient hardware.
Yes, I thought about that. I am aware that they will find out if too many people in one building start to mine. But right now I would be the first one in my building (as far as I know) and also with 90 units in one building I don't think it will stand out between the electrical stoves, fan heaters and dish washers etc. At least not with a setup for 1000€.
Tread carefully in this field mate. Albeit this consumption will be detected sooner or later, it all boils down to how the infrastructure is implemented. Assuming it's a big building I'm sure they won't have only one electrical counter in the same building. If made with proper care they will have electrical counters spread out and dedicated to a specific division or even floor. So while they could only notice that spike of consumption at the end of the month (assuming they don't monitor it daily), I'm really sure they'll be able to tell from which Floor/section of the building this consumption came from and from there it's just a matter of time until they find the root cause.
Put things into perspective : Are you willing to risk your actual accommodation just to nab a few dollars per month ? Assuming that the spike of the first month goes uncover that is ... Some things aren't worth doing mate, don't do something that'll make you regret down the line.