My realtor is really in to the historic homes in San Antonio and he brought it to me through his contractor (network is everything!).

That is all I said and we scheduled a meeting for the next day to come into his office.

Your not correct under many different circumstances.First property tax is 1.1% (fairly safe) with 2% annual increase (prop 13).Next expenses include a lot more than property tax and interest. 

One of the things I learned early is that the margins on a deal need to be substantial. 

There are a lot of options out there.Some of the most useful items BiggerPockets members have identified are features that save time so they can spend time working on their next property.

I live on the main unit. 

I do airbnb in all my rental arbitrage, they are the biggest player in the STR market.   

And that's great you are figuring out how to get to your next investment.

Because the Property Class dictates the Class of the tenant pool that the property will attract.

Our purchase price was about the same as the bank appraisal.