mid term lease and visitors

[Sam Tamayo]

Hi, getting ready to send a lease over for a MTR, mid term rental, that I market on Furnished Finder. I primarily find solo individuals like travelling nurse or an individual who has a 1 -3 month job in my area.  The unit is attached to my primary home, has it's own entrance and fully functional, about 400 sq feet, but is part of the dwelling and I prefer for it to be lower key.  Is there anything I can add to the lease to ensure I don't get a tenant who might have extended visitors?  What I'm trying to protect against is a spouse or friend coming in where a few days turn into a few weeks or worse yet, they have plans to have someone undisclosed to  move in full time.  Can I legally limit or prohibit "overnight" guests. I want to have some flexibility should they have a spouse or friend or family member come visit them while they are away on assignment, but I don't want a visitor to become a full time second occupant.  Can I legally write limitations into the lease in this situation?  I'm in CA.