This is quite sweet, if a little cynical!
I was a confused at first by not realising that the tenants only count when they are right next to items, so I was losing money when one stood between the two water things on the 1st floor, but was not actually close enough to them to count. Perhaps have some kind of attention indicator? It also wasn't clear that it doesn't get counted if tenants walk past a thing and don't actually stop. I missed that the big box on the top floor was an appliance at all (a shower?) because the pipe was hidden behind a tenant.