My Rental Tracker is exactly that, an app to track your rental property.
You can enter all of the basic details about each property, including
title (ie what you refer to the property as), the address, year built, current rent amount, value of the property, square feet, number of bathrooms, and tenant information. You can upload an image of the property as well as mark the location of the property on a map.
Data is stored locally on the device. Backup you device regularly! In case you dont want to, you can email the information you have about the property to yourself in case something was to happen to your device.
Future features include tracking rental payment and maintenance items.