Tenant wants to add fence and pool

[Zantiago Zurita]

My tenant has asked me if she can put up a fence around the backyard and an above ground pool? I don’t think the fence is an issue (unless someone sees/knows of an issue), I don’t know about the pool. If I say yes I think I’m going to say the tenant has to remove the pool when they leave. The property is in Maryland. Thoughts? Suggestions? Guidance?