Mailbox power though would require you to import your data where other programs like dealmachine build the prospecting into their platform.

Using that model, local data and math, I am coming out with returns (ConC and AROI) in the double digits of percent after fees and all bills.

I am reaching out to 2 other CPAs for a consultation as well, but looking for some anecdotal data from others to see if they have run into this issue in the past.

Also wondering if anyone knows where I could find vacancy data etc, as I think low vacancy rate areas would make renting out easier?

I'm not a data scientist or statistician. 2. 

It should be similar to looking at "sold" data in Zillow.

As the property increases in value, I use financial strategies to Refinance the property and pull out my original investment.

But it is becoming way too tedious and time consuming to input all that data, as there always are so many individual expenses, even for just 6 units. 

Texas tax laws dictate that an appraisal district in each county, administered by a chief appraiser, is responsible for appraising property values each year.For a the appraisal of a taxable property, property tax is determined as a percentage of your home’s value, so the more your home increases in value, the higher your property tax bill will increase.

I normally access most of this sort of data from the U.S.