Your research should start with the California Business & Professions Code section Section 10130 which provides in part: "It is unlawful for any person to engage in the business of, act in the capacity of, advertise as, or assume to act as a real estate broker or a real estate salesperson within this state without first obtaining a real estate license from the department..."

I am not quite sure the applicable rules in your state but here in California before any unlawful detainer (eviction) proceeding can take place, you must serve a 3-day notice to pay or quit.   

Aloha,If you are using an actual Commercial Lease, they are typically quite lengthy and should have, at a minimum, a provision such as "Lessee shall not use or permit the use of the Premises in a manner that is unlawful, creates damage, waste or a nuisance, or that disturbs occupants of, or causes damage to neighboring premises or properties."

Hi fellow investors,I'm in the process of filing Unlawful Detainer in San Diego against my tenant.

Theoretically she could try to go to court for unlawful eviction, but given the fact the property is unsafe and she is in trouble with the law, my guess is she will just go away.

This tenant is in a strong position to get relief in Circuit or District Court should you attempt to place illegal liens against their property, or attempt collection through an unlawful garnishment of bank accounts and wages earned.

Under Texas law, it is unlawful for a creditor to refuse to partially release a lien such as the above that is clouding the title of a person’s homestead.

I am from VA and it's considered a landlord friendly state but I recently went through Eviction and it will take close to 12 weeks for the tenant to be evicted from the date of filing of unlawful detention.

As mentioned, it should be illegal for someone to be unlawfully in a home, but it seems the law is on their side, and many of them know it, and how to game the system.

Engaging in acts of violence or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the Lease that otherwise jeopardizes the health, safety or welfare of the Landlord, his Agents or Tenants.