I am turning my tenant's flat into a maze so he leaves
I own two flats. I live in one. My asshole tenant lives in the other. He is using every legal means to threaten me and I cannot kick him out. I am allowed to modify the layouts of the flat as long as I don't touch any plumbing, gas, or electrical.
Also I cannot block access to any rooms. And I cannot decrease square footage. So I added a room. He is on the ground level. And turned every one of his rooms into a maze with 100cm width (minimum allowed clearance). He is miserable and still has to pay rent on time so I'm waiting for late or no payment of rent so I can finally kick him out.