I work in property management for a nationwide company and also have a relative thats a small landlord. Things vary state to state but our leases state that we need 2 months notice. If not there is a lease break fee. For my relative it's not in his lease but I believe he said the law was if he was given 2 months notice he had to accept this by law with out penalty. Check with your state. I thought the security fee could apply to anything. Small note, interest is to be paid out on the security fee.
Prior to moving out take all pictures of your unit. Also, ask for your landlord to walk the unit with you and sign off so that there no surprises down the road.
Anyone taking over your apartment will have to meet your landlord requirements(criminal, credit, income requirements?). You will not be able to check these requirements if your landlord has any. If there are no requirements then there can be no refusal of your applicant(fair housing laws apply to everyone preventing discrimination of sex, age, religion, etc.)
In our state the occupant has the law on their side. If you are doing the best you can(working with landlord, communicating, etc.) the law is on your side. Some states they throw you and your stuff on the curb:eek: