So why are you handing over the keys?

I am not a lawyer.

That being said… it doesnt seem like it is any of your business? Do you still have keys to the place? Do you have property inside it? Sounds like you made an agreement with the landlord and the landlord made an agreement with somebody else. How does the second agreement affect the original agreement?

The only thing to concern yourself with is making sure you’re not paying utilities for a new tenant.