John is renting a single family house from Chris for the summer. During his tenancy, John caused extensive water damage, which affected the structural integrity of the house. What has John committed...?

Act of Waste.

Explanation:

The term "Act of waste" is used in property law to specify the damage done by a tenant or anyone aside from the owner of the property. The abuse or misuse of the property of someone else resulting in damage or destruction of that property.

This term is used in the legal sense in property or real estate when someone who is not the owner of the property abuses or damages it. This allows the owner to press charges in the court or a lawsuit against that person. The lawsuit can be either between the tenant or lessee of the property and the current landlord or the owner of the property.  And in the act of causing damage affecting the house's structural integrity, John commits the act of waste or waste act.

no i don't think so.

explanation: