You will likely work your whole real estate career and never have any cause to consider the Lawful Object of a contract. The common example of a contract with an illegal object is a contract to have someone murdered. Such contracts are void. Needless to say, this is not a big issue in real estate.

Lawful Object is rarely used as a defense to a real estate contract. Take, for instance, the contract to sell an illegally subdivided lot. It is not illegal to buy or sell an illegally created lot. An attempt to sell a piece of a farm zoned EFU results in a tenancy in common, not an illegal contract. Where the buyer does not know of the illegality, the issue will be mistake or misrepresentation rather than illegality.
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