rental agreements?

my roomate and I were undecided wether to rent a third floor apartment or first floor. Third floor was 850. and first was 1000. per month we thought we'd take the cheaper and told the landlord but changed our mind due to the fact that the third floor had total white carpet (where not the most neatness teens). The landlord agreed to the change after we had signed a lease for the third floor. Landlord told us she would make up a new contract for us to sign for the first floor unit,this was in Sept. we have asked her consistanly to send us the contract but have not received one. The third floor is rented so I am assuming the lease we signed is no longer active. I am presently in College and thinking about transfering to a different city after this quarter (mid december). What are my obligations to this apartment if I have not yet received a lease to sign for the first floor unit Please Help I'm not sure what to do