Re: Purpose of Residence Keys

Apart from checking there is no other lot trait interfering with it, like "Private Dwelling"? (which discourages visitors) 

>> needs to be a 'Good Friends' status with the person that receives the key.; so perhaps monitor the friend status bar also. 

From IGN TS4 'Apartments" Guide "..."Keys to friends have no direct benefit other than having a close relationship stop by often. Keys cannot be given to friends for houses in the suburbs in this way."

a few more tips here: 

Happy Simming, and good luck with the process.

Sasha