If your 10x20 market price isn’t $110 or higher don’t do the project.  

We also offered him a deal that if he signed another year lease we would reduce rent to match market rates of $1100.

One bit of advice is scaling too fast if the market changes and factors out of your control (interest rates, job cuts, rent decline, job loss) have enough in reserves to weather those storms.

Looking at the homes on the market, prices vary wildly from $~200-$400+/sqft and it doesn't seem to correspond to just the quality of the house.

We moved to san antonio for the army as well and have been very happy with the real estate market here.

Knew the market was good and knew that I couldn't go wrong if I rented it out considering it was near a popular military base as well.

With the Income Approach, the appraiser is going to evaluate the income and expenses of the property to develop the Net Operating Income, then they'll apply a market Cap Rate to the deal.

My property taxes are high - around 9k a year.I’ve been out of touch with the market this year dealing with an illness and I’m trying to make the best decision cause this is my lifetime investment and extra income.

Unfortunately it means that you are most likely mispriced or for some reason, people are not finding your marketing. 

Standard loan sizing 75-80% LTV; 1.20-1.25x DCR; 30-year amortization in Top & Standard markets.