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I am sorry to hear about this situation, D. Please tell me:
1) Does your lease contract specifically mention anything about what is allowed or not on the patio? Or, it is silent about this?
2) Is there a set of "Rules" published for the tenants? If so, does it say anything about what is allowed on the patio? Or, it is silent?
3) Was the promise that you can have the bench on the patio in an email, or a text, or simply verbal?
This is not an answer, but an information request. I need this information to answer your question. Please reply, so I can answer your question. Thank you in advance.