Many years ago, I was in a similar situation. I signed a lease in an apartment building a little two quickly, and was not going to live there. I just spoke to the building manager and told them I was not going to be living there after all, and that I was going to walk away and had no desire to recover the deposit and first month’s rent. They felt that was fair and we terminated the lease.
My point is that any lease is just a contract, and any contract can be modified by mutual consent. IANAL