Your house would not be rent-controlled as it is a single family residence, however, that doesn't prevent you from evicting the tenant if he has breached the lease agreement.
Do not put his stuff on the lawn. You need to serve a three day notice to quit the property, pursuant to Code of Civil Procedure section 1161a, subdivision (b)(4). If the seller does not move out with the three (3) day notice, you will have to bring an unlawful detainer action against him.
It does not sound as though the property is covered by the Los Angeles Rent Stabilization Ordinance (LARSO), because it is a single family residence.
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