I use PropStream for all my data needs. 

Also, are the expenses from the agent marketing data?

When you can, jump in the pool and test the water.A little caution with that water, as unless you have a good idea what's under that surface, going head first is not the choice I would make.Just don't expect to get in the water and jump out clean and dry the first time.

You will get tested walking to your property , the locals dont see it as yours they see it as there property and your just renting the real estate.   

I just received a copy of the previous inspector's report, and there were some plumbing/electrical issues (that supposedly have since been fixed), high moisture in some areas (so we will need to do a mold test), and a roofing issue on the carport, as well as some wood rot and a few other issues.  

To do % of two numbers, I always cheat and go to this calculator: https://www.marshu.com/articles/calculate-percent-with-simple-number-percentage-calculator.phpEstimate: when pulling a list from a data source (like listsource.com) - the site estimates the equity by how long the mortgage has been in place and estimates payoff based on a standard amortization rate. 

if so,How accurate is the data and is it real time?

Unless you give them the company tax return - in which case, they see all the same data as they would on page 1 of Schedule E. 

I.E. letters, post cards, bandit signs, etc... without proper tracking, split testing of copy, headlines, CTA's.

We also have the ability to shrink the scope of data to specific cities as long as they are apart of our MLS.