Under Illinois law, to form a contract there must be an objective manifestation of a meeting of the minds or mutual assent as to the terms of the contract. Stepbystep guide on how to write contracts for leases, business partnerships, and employment contracts.The answer lies in four critical ingredients: an offer, acceptance, consideration, and mutual intent to establish a legal commitment. This handbook guides attorneys through the process of creating, formatting, and modifying contracts. In Illinois, contracts can be verbal or written down. However, the best option is to have a written contract. What is needed for a Contract for Deed? In this blog post, we will explore the different types of contracts, the legal requirements for contracts in Illinois, and provide tips on what to look for.