House hacking

[Paul Kuegle]

I recently bought a duplex and moved in the back unit so I would have the back yard mostly to myself. The tenants moved into the front unit and asked if they can put a swing and BBQ in back yard & I said yes. Then on move in day I see they brought a fire pit too and didn't ask me. Should they of asked me? I don't want to have them back there all the time. What should I do? Is it unreasonable to say they cant have that in the back yard, I did said say they can have access to the back yard but didn't expect them to "take it over"... Please let me know your thought. Thanks.