Yes you will need to run the co-signer's credit, so you will need to get their signature to do that.
Here is my language:
LEASE ADDENDUM: COSIGNER’S AGREEMENT
Property Address
Effective Date -
Residents
Name Birth Date Social Security No.
A: ___________________________ ____________ _________________
B: ___________________________ ____________ _________________
Cosigner obtained by Resident ___
Cosigner Name Birth Date Social Security No.
___________________________ ____________ _________________
Address (street, city, state, zip) Phone Relationship to Resident
___________________________ ____________ _________________
Terms
All residents (tenants), as well as any guarantors and/or cosigners, are jointly and severally responsible for all terms of this lease agreement. Notice to one resident will be sufficient for notice to all residents and cosigners..
In the event of non-payment of rent or other charges when due, the cosigner agrees to be held responsible for payment and authorizes the Owner to charge to the cosigner any rent or other charges as bound by the terms of this lease.
If the resident who has secured a particular cosigner moves from the property, the Owner will provide a written release to that cosigner only upon satisfaction of any rent or other charges due under the terms of the lease and after remaining residents have secured an approved cosigner.
The cosigner will not be a resident and has no right to possession of the premises.
This Cosigner’s Agreement goes into effect at the time of the signing of a lease by the resident and becomes an integral part of the underlying lease. No modification of the terms of the underlying lease shall operate to discharge cosigner from obligations under this agreement without a signed release by the Owner.
The receipt of a signed copy of the Cosigner’s Agreement is a material condition of the underlying lease.
Signatures
A faxed copy of this page signed by a cosigner is considered valid for purposes of this agreement.
_________________________________ _____________
Cosigner signature Date
_________________________________ _____________
Landlord signature Date
--99.35.xxx.xxx