A Personal Guaranty is a guarantee of term, meaning that it remains in effect for the full duration of the lease. The landlord requires that I sign a personal guarantee, or provide a 6-month security deposit, to lease the space.When dealing with "small business" commercial lease agreements' typically the landlord will require the "personal guaranty" of the small business tenant. It can also require a personal guaranty, which will place personal liability on you. GUARANTY. A good guy clause is a limited personal guarantee on an office lease where the individual's liability ends once the space is vacated. The general rule is that a personal guaranty is to be strictly construed and a "guarantor should not be bound beyond the express terms of his guarantee." A negotiation regarding a "good guy guaranty" pertains to a limited personal guarantee commonly utilized in commercial leases within New York City. A guaranty is a promise to fulfill the obligations of another party, and is subject to the ordinary principles of contract construction. The personal guarantee likely binds you to personally pay the rental obligation, i.e. , the contract amount.