RSO Duplex - Current Tenant

[David Yu]

Hi! We are looking to purchase a duplex with Los Angeles RSO provisions. One unit is vacant while one unit is occupied with a tenant that is month-to-month and has rent that is way under market rent. What are our options in trying to get back to market rent?  Could we 1) negotiate a new lease with a way higher rent? 2) evict the tenant without any cause? 

I know we can try cash for keys but I know that is not always something that the tenant may accept especially with their rents being way below market rate. Looking to meet with a landlord lawyer but wanted to see if there was any general advice first. Thanks!