Originally posted by @Matthew Irish-Jones:
@Dennis Day if rent is on time, and he swears up and down he does not have a roommate... What is the issue?
Well, the issues are many.
First, as another user mentioned, there is the issue of whether I can trust the original tenant. Plus, if someone has moved in, I have a right to know who is living in my buildings. To that end, I owe it to the other tenants in the same building to know who is in my buildings, and, more to the point, have them pass a background check- the same as any other applicant.
Then there is the issue of parking. This possible new move-in has a vehicle that must now be accounted for, and room made for.
Add to all that that this possible new tenant is now using water, and, more to the point, hot water, which I am paying for. These are added expenses that I did not factor in to the original lease. Will this new tenant run the spigot in the driveway for three hours washing his car? Who knows. The point is, unless this new tenant never washes his car or takes a shower, there are going to be added costs involved with this possible new tenant.
And these are just the factors I've come up with off the top of my head. I am sure there are plenty of others. Here are a few more worries: a new person in the building only adds to the likelihood of one more body possibly tripping and falling down the steps, or slipping in the bathtub and resulting in an ambulance trip to the ER.
So, the added worries are many. I think it is only sound policy to know who is in the building, living full time. I can't be the only one who would raise an eyebrow upon seeing a new, hitherto unknown person who has suddenly become attached to the building in some unknown, quasi-manner.