There are some great mileage tracking apps out there that make it easy. 

Most people who get these apps though are hoping it will do all the work for them.

With that being said it’s plenty of wholesalers who operate with integrity and character but the few rotten apples tend to spoil the whole bunch. 

Also, the nextdoor app is great for finding local resources.

I wish the map options were available on the mobile app as well though. 

You would be best served by managing them with two separate apps.

One thing you might want to consider is partnering with microsoft and adding a third party app to their office 365 suite of products as they have an accounting arm and many other applications already in play that you could add on just for property management and it would work on their system to integrate everything.

So I believe mortgages will look at DTI and want to make sure your income covers your current and future debt obligations at a percentage of 40-49% I believe, so their multiple would be more like 2-2.25x, but it's not a real apples to apples comparison. 

I use an app for my phone called Privyr.

That's how many of the larger complexes get funding to buy and rehab buildings,, that the normal small investor can not afford.Section 8 like other government programs has difficult aspects to it to manage, the people on section 8 are like a bushel of apples, some good some rotten to the core, and when mixed together the entire bushel tends to go rotten if the rotten apples aren't tossed out of the bushel.LOTS of paperwork and inspections and the inspectors are just as complicated as the tenants sometimes.