There seems to be a semi-infinite market for garbage software sold to landlords. At my current place I need an account to unlock my door, a different account to open the garage door (because the garage is managed by a third party), an account to reserve the elevator for move in day (which tried to up sell me moving services), an account to get sent my water bill which charges me $15 a month for the privilege (I don't pay me bill though this service, just have it emailed to me) , an account to pay rent and and an account to submit maintenance requests. Part of the trick seems to be to offload the costs onto the tenets who have no choice, but I'm sure our landlord is paying a good chunk for some of these.
If you have minimal to zero scruples, this seems to be an easy market to make a start up in. Landlords will buy anything!