Certainly it's not the only mistake investors make, but it's the one that is most easily corrected.

There is one unit outside, then a couple pipes go through the wall to a wall mounted unit.

I need a program that will easily allow me to switch from my (mac) laptop to my iPhone, or to my iPad, and I want real-time updates to share with others involved with the project, preferably with push-alerts.Projects are primarily renovations with fairly long-term timelines and hardfast deadlines, but there are some items that can be done more "at leisure" or which are one time one-and-done type items.

Based on year built, class of tenant and size of building you should assume all expenses (not just repairs) will easily  be 50% of your total rental income.

Do I need to do something so that the source of cash deposits is easily distinguishable? 

I think the information that the provide is easily available on the internet. 

It does not include huge holes left by TV mount or surround sound, etc.  

Also the ability to reinvest idle/contingency capital much more easily.

Any A-Z licensed lender can easily accommodate you.

I can just as easily call her and say hey if you don't take the deal now, the deal is off, I won't pay for any, and you will not get anything in court either.