Which of the following is NOT a type of contract?

A conditional contract is often used as a term to describe agreements that depend on certain conditions being met; however, it is not formally recognized as a distinct category of contract in the same way that implied, unilateral, and bilateral contracts are.

Implied contracts arise from the actions or conduct of the parties rather than written or spoken words, indicating a mutual agreement. Unilateral contracts involve a promise made by one party in exchange for an act by another party, while bilateral contracts consist of mutual promises made by both parties. These three types of contracts are well-established in contract law and have specific legal definitions and implications.

In contrast, while conditions can be part of many types of contracts, the term "conditional contract" does not represent a standardized category, making this option the correct choice for the question asked. Understanding the nuances of contract types is essential for leasing agents and helps in navigating agreements accurately in their professional environment.