While there is no law in the U.S. that states that writing a form of „under duress“ near your signature or somewhere on the contract makes the contract questionable, some sources indicate that this is a possible tactic. But to be enforceable, leases must comply with the law. There are laws on how to enter into a lease, what information must be disclosed and who can obtain it. Each state`s requirements are different and cities sometimes set terms for leases. The San Francisco Rent Control Executive Order is an example of municipal rules that govern leases. A rental agreement is automatically invalid if it breaks the law, for example. B a rental agreement for illegal purposes. In other circumstances, such as fraud or coercion, a lease may be cancelled at the request of one party but not the other party.
Aggressive commercial practices are prohibited by consumer law.  These practices involve harassment, coercion or „unlawful influence“ to seriously impair a consumer`s freedom of choice or behaviour. There is no need to use physical force. The exploitation of a position of power to exert pressure is sufficient to form the basis of an aggressive practice. Where an average consumer has done something that he would not have done otherwise because of the aggressive practice, the competition and market supervisory authority may take enforcement measures and, in certain situations, he may bring a civil action himself (see below). For example, if your lease states that no pets should live in the unit, but you will have one while you live there, you would have broken the contract. It is therefore worth knowing the consequences of a lease before violating it. Contracts can only be legally signed with the free will of a party. Any kind of coercion is considered a constraint when it allows one person to exploit another.
The modification of a contract can also be done under duress. Some leases are. A cancelled contract is described as invalid „at first sight“, which means that it cannot be imposed by anyone. A court treats a cancelled lease as if it did not exist. Even if a party does everything it has to do under the lease, it cannot compel the other party to fulfill its obligations. You don`t have to do anything to invalidate an invalid lease. The law automatically invalidates it. Depending on the level of breach of contract or the direct consequences of the act contrary to the tenant`s contract, the measures that the landlord can take vary. In some rental agreements, the landlord may stipulate that he pays a fine in case of violation of the tenant. . . .