Alternately you can charge her to install a keyless push button lock but I suspect if these are temporary visitors and they you have to change the codes later. 

@Joe Splitrock, I'm not fighting to keep him, I wanted to boot his *** out in April when he came out of unit screaming at me because the handyman was too loud -- handyman was grinding cement in the walkway. 

Objective:Buy premium agent wordpress themeActivate plug-ins and widgets for more precise lead capturing (i.e. after three searches ask for contact etc.)Allow visitor to search for any home listed in my MLSMLS data to be updated ATLEAST twice a day.THANKS SO MUCH!

Have yet to see if it was accepted, though.I wish you great success, and yes, as I read your post my brain was screaming : Ask a RE attorney!

What concerns me (I have lots of debt on my properties) is that the world seems to screaming for deflation.  

Soldier on leave to visit wife & new baby, forced to leave by Landlord who says he's stayed too long.http://www.ijreview.com/2014/12/216157-solider-lea...Don't Be This Landord!  

Bolt said the landlord at The Groves apartment complex in Central told him he had overstayed, saying visitors are not allowed to stay in the apartments past seven days, per the agreement signed by Bolt’s wife, Lily." 

Between cold/potentially messy weather, traveling, visitors and all the other social and holiday to do's, people have less time to property hunt and many sellers will take their property off the market, as well.

Decide then what you game plan will be, then follow that course of action.There will be times that you may act as broker and then become aware of other information that screams to become an investor.

I'm assuming your lease has some sort of language about the length of time a visitor can stay or additional occupants allowed that are not parties to the lease.