You have to serve a proper notice to pay or quit followed by the filing of an unlawful detainer action to obtain a judgment for possession. I would recommend hiring a local attorney to help. Usually, they charge a flat fee of between $600 to $1000 for a simply unlawful detainer action.
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I handle evictions on a regular basis. You need to serve them with a proper three day notice and then file an unlawful detainer case for non-payment of rent. Feel free to call me to discuss.