Asking tenant to leave - Nicely

[Armando Morales]

Here's a new kind of question - maybe. I want to ask a tenant to vacate an apartment because I want to move into it. She's been a good tenant. Pays her rent on time but slightly dirty. She's been in the apartment for about 10 years now. Long before I bought the place. Her rent is below market. The last agreement/contract she signed was when she moved in 10 years ago. I never had her renew a lease. This isn't so much about how do I get her out - I know what to say when the time comes - I'm more interested in knowing if there are any legal type issues I should be looking out for. Since it's a month to month deal at this point can I easily ask her to move out? Thanks.