Legal Question in Landlord & Tenant Law in California

The "declaration" you have could be considered a management agreement. That would give you the authority to evict the tenants, because you're acting as an agent of the owner. As an agent, you would sue in your name for unlawful detainer. You'd be able to obtain an eviction, but in some cases, you would not be able to collect the money damages, unless the court accepted the declaration as the governing management agreement. You would also be able to appear in court, because you'd be suing in your own name. It's not wise to handle UDs on your own, however, Hire a trusted attorney, You'll be better off in both the short, and the long run. Good luck.