Replying to Me and my set-up vs. my landlord

So me and my friend built a small set up in the backyard of the house that I rent while at school.

The landlord came over today to do landlordy things, and apparently freaked out about it, saying it had to be taken down for legal issues blah blah blah.

I'm wondering if anyone has a good idea of how to work this out with him cause i really need this in my yard, since i barely get to ski while i'm at school.

I fucking hate legal issues like this, i'm clearly not going to sue my landlord if i break my leg on something I built on his property.

UGH.


k for legit answers. thanks.