I tend to give brief answers: bottom line is, what does your lease say about this? If it is silent, then no. I.e., the lease provides that you must give them 30 days notice, which you did. In order for the vacation form to be a requirement, they would need to state that, or, perhaps indirectly, have some other statement that requires you to sign Landlord's standard forms. I definitely recommend having an attorney confirm the language in your lease, and then have the lawyer let the landlord know that their actions are not acceptable. But, being "politic" is likely important here: I'm guessing they have a security deposit, so keeping things civil will also enhance the likelihood you'll get the deposit back without a dispute over claimed "offsets".
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