Is an unsigned lease agreement valid?

When I signed my apartment lease, the property manager was not on-site so the leasing assistant just had me sign the lease. I have a copy of the lease with just my signature.Is this agreement valid? If the manager signed the office copy of the lease but not mine is it valid? I need to get out of my lease and I... show more When I signed my apartment lease, the property manager was not on-site so the leasing assistant just had me sign the lease. I have a copy of the lease with just my signature.Is this agreement valid? If the manager signed the office copy of the lease but not mine is it valid? I need to get out of my lease and I don't know how to approach the situation. Should I take it to court and if so will I win? Or should I just take my unsigned lease to the property manager?
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