For a residential lease to be official, a residential lease agreement must be created and consented by both parties. The residential lease agreement is a contractual agreement that defines the terms of the relationship between the two parties. In most cases, this agreement needs to be a written document for purposes of a legal evidence, but some agreements may be oral. Since the agreement is an official document, using the proper format when creating the lease is a must ﾖ agreements require correct wording and proper structure in order to be legally sound. If a written residential lease agreement is to be created, many landlords may pay for the agreement to be professionally created. Free residential lease forms, however, which are used commonly as well, can be a simpler and more practical method of creating a residential lease agreement. The residential lease form can also prove helpful during negotiation, after which both parties can sign and officially begin the residential lease.