Is a lease agreement void if the owner did not sign it?

Question Details:

About 4 months we leased a condo. We told the property manager that we wanted a long term tenancy since our kids would be in the nearby schools. The property manager signed but then told me they no longer represent owner. We are not settled in yet and we have begun to receive notices of default being posted on door. We want outof the lease so we can find a more permanent living situation. Is the lease void if owner did not sign? I have her email address and bank deposit info but no where on the lease does it have anyone's contact information or physical address. We don't want to settle to this pre-forclosed condo.

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