We enforce the terms of the rental agreement the same way too.

In the middle of a huge project I check to see if permits have been pulled after code enforcement stopped and said permits where not pulled.

The campground owner needs to rethink his strategy and heed the advice of the law enforcement officer.

The city won't enforce HOA.. so we just built what we wanted.

.), bottom up (code enforcement) or inside out (record owner, their heirs or PR).

The property owner has no deal with you, and no obligation to you, for you to enforce.

Still, it has always been a bad experience with damage and tenants angry at us for enforcing the rules. 

I told him that it is the building rule and I want to enforce it.

On the legal side-If a contract is written up and the MLS states a fact about the house that isn't corrected or addressed you (if all paperwork is legal and properly done) can enforce those facts and have them completed by the seller and enforced by the court. 

Anything can be in a lease but doesn't mean that all of that specific language, some of it, or none of it will be found enforce able by a court of law with a judge.