Personal Guaranty clauses typically contain a sentence similar to this, “Guarantor agrees that Lessor can renew, extend, or otherwise modify the terms of the Agreement and Guarantor will be bound by such changes.” This language allows the Lessor to change the lease terms due to a re-write or deferment (i.e. Lessee become delinquent or requests a modification of the contract) and the personal guarantor(s) would still be bound & liable.