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Thank you...but I am not sure I understand the question...are you asking if you can void the contract because of this?
When you negotiated the lease, was the security system in place?
That would be a basis to void the contract. That is, if you negotiate the lease with the assurances you would have the security and subsequent to your lease being formed the security was removed? You can demand the landlord correct this...and if they refuse? That would be a basis to walk away from the lease without having to pay any fee.