What Is Considered “reasonable” Effort To Find A New Tenant?

Hey all!

We ended up moving to a house (found an amazing deal) but are stuck with our old apartment until the lease is up in September.

It’s in the heart of Charlotte NC at a great price and size, so thought it would be super easy to find a new tenant.

Except we have not, and have reason to believe the property managers are not answering calls/questions from prospective tenants. I’ve had someone tell me they reached out to them and never heard back from property management, the apartment has 33 contacts on Zillow yet the property management says they’ve only had one showing. Something isn’t adding up to us, and are considering getting a lawyer involved. They also asked us to return the keys even though we are still paying rent…

Thoughts on the situation?