Tenants Erected Shed on the grass!

[Krystal Nydegger]

Our tenants went ahead and put up a shed in the back yard, without permission, right on the grass. What should I do now? Should I let them keep it but they have to pay for the damage to the grass when they move out? Make them take it down? I'm leaning toward letting them keep it, since it looks like a nice shed, and it will hide some of their "stuff". Although there is no concrete pad under it. Will that be a big issue? Permits are not required for a shed in this area, and no HOA, so that shouldn't be an issue. What else do I need to take into consideration?