What math do I need to ensure is correct?

You want to ensure the proper contingencies are there for you.

You would have to know what market rents are, what actual rents are, operating data, etc.

The data from Wharton County Appraisal District may have little or no validity or it could be spot on - you just never know without comparable data. 

I'd chat with your tax person on this, and...maybe get  a few second opinions to ensure it's being reported correctly. 

The data I've seen predicts growth into 2020 and then leveling off for a bit.It's likely I'll be leaving the city next year.

They can dig up reports for 9.99, pretty amazing data.

Never be afraid to ask questions, and expect clear, data-backed answers.

I use a service that is an expert on this topic and they handle all of the follow-up to ensure the owner has the proper paperwork.

I’ve made a couple posts here and I got some amazing advices and now that I have a full time IT job at a data center my next question is should I just save up and then do a flip or should I try to get into a seller finance multiple family property.Then rent out the units and maybe even rent out the rooms in the unit I stay in and from then I would have money saving up while buying for a property I will own in the long run and also could do flips after a year or 2?