We took the reverse action and started lowering asking rents until they moved.I suspect the reason that one property of yours turned quickly is because your asking rent was very favorable vs. local competition. 

This implies residential units can be built at lower costs and provide better return. 11) adding an ADU to SFH can make the SFH fall under rent control.

I would just take into account that a lower down payment will mean a higher monthly payment so be sure to run the numbers conservatively in order to ensure your STR revenue is able to carry your monthly payment with this higher mortgage cost. 

The first question is, can I use a second home mortgage (10% down and lower interest rate) for this. 

I would like to have lower monthly payments should I make a big lump sum payment towards my principals and ask my mortgage company to adjust it or refinance it or which one is the best ? 

When you researched markets like Austin las Vegas Miami, those markets have higher land cost and are more cyclical in nature tend to have larger price swings compared to regions with lower land costs.

That seems like a lower demand area than any place I would ever invest.   

Some of the costs quoted shock even seasoned flippers as they are lower than even material are in many markets. 

Airbnb listings (newest to oldest)(Hit a snag in lower reviews haha I promise I'm a great host): airbnb.com/h/familydelightairbnb.com/h/homeoasisfloydairbnb.com/h/sereneoldtownsantuary@Sarah Kensinger@Ika Sargeant Well done.  

I will continue to do my research and try to find a CPA that handles Texas and has a lower minimum I think.