let me congratulate you for your first 'commissioning' of a highway. however you have to drive gently the first few times and not think about enjoying it because of the problems you mentioned. when the way is freer then you can drive anyhow you like ok?
unless they are destroying the house, the landlord should leave them alone. if he wants he should negotiate a new rent if thats what is bothering him, or maybe he wants one of them to marry his ugly daughter.