21-year-old needs to evict problematic tenant

[Anoah Wang]

My handyman worked on a studio that belonged to my deceased father. Then he asked if he could rent it. We had a verbal agreement that it would just be him. Later we wrote a contract stating no sublets allowed. On the day of signing he stated that his friend would be moving in with him. I told him this was not agreed upon and he would need to find another place with his friend. But he moved her in anyways and now refuses to leave. Before ever signing the contract I deposited a check that he gave me for rent and and 1/2 security deposit. His friend is a high functioning disabled person who can apply for government housing. I gave him a 30-day notice. He has sent nonviolent threatening texts, threats to call building department. Is there any advice on how I could remove this person. I'm waiting to hear back from an attorney. I'm young and all your guys feedback would help so much thank you.