How long has she lived there? Less than a year, more than a year? That matters because of the amount of notice that you will have to give her.
Someone asked a great question earlier... Do you want to sell the unit?
This questions was also posted a while back so if you have an update for us that would be great. Let us know how it turned out.
All the best,
Coldwell Banker Star Realty
BRE Lic #01456982
This is a legal Q.
I've heard lawyers on the radio say the laws apply differently to boarders renting a room in the house you live in as opposed to renters exclusively occupying the whole condo/home etc.
Being compassionate, and trying to help is human nature for many if not most of us, but when
dealing with addictions of any kind, or mental health issues, challenging may not even come
close to describing how difficult it can be.
You say your niece was in a sober living home before moving in with you, so maybe the people
who run that program could be of great assistance to you.
Good luck to both you and your niece!
She is family, try to reason with her. If that does not work, try buying her out. If that does not work, then you need to consult with an eviction service or a real estate attorney. There are certain tenant rights that exist and you do not want to violate.
Good luck. No good deed...