Make sure the site is mobile ready since 70% of local searches start on a mobile device.

That is true, the water damage could serve as an excellent device to ward off other investors and even more effectively ward off regular buyers.

A mortgage is a device that lenders use for their gain at the expense and/or loss of the homeowner.

Like Alan, Excel is your friend, but I use Google sheets - accessible anywhere from any device. 

I could have sworn I heard on a BP podcast episode that there is a device (or devices) you can attach to existing plumbing that effectively individually meters each unit of a multifamily property without actually separating and metering each unit, but I can't remember what it's called.

Are there devices that can be installed in a residence that can conclusively there was continuous smoking in the residence? 

Those guys can then view their individual workorder lists from their mobile devices.

Like required text notification w pin every time you open one of these apps from new device.

Hi @Jason Mcdaniel, I have a web app that is designed to work great on mobile devices that will allow you to organize your receipts, either by yourself, your company, a property, or a unit.

I understand an addendum to the lease would probably be a good idea that covers the situation of the tenant leaving the devices unconfigured (and open for anyone to control) and potential security / cost risk that may involve.