I have a property that I purchased in LA county that has a ~12,500 sq/ft of flat land (12,500 Sq ft lot) with one existing primary residence (1200 Sq/Ft)I hired a architect to design an ADU (3bed/2ba, 1200 Sq/ft) and Addition (3 bed/2 ba, 1200 sq/ft) to the main home. 

I am also a disabled veteran at 70%, so I don't get 100% off of property taxes, but I do get a discount, in addition to the benefits of homestead exemption. 

If you open this as a single-member LLC, it gets a little tricky with additional state taxes when sold or if something were to happen to the single member and the property went to a family member.

In addition, being on a hillside in SoCal, it is critical to determine the makeup of the hillside sub-surface conditions as this will make the difference between a 150k foundation and a 500k foundation.

Any investors in the Houston area with experience in building an addition for a home to increase square footage and add value?

Check with local governments for their economic plans.)Job Growth: Prioritize areas with a minimum of 2% employment growth YoY for the past two decades.

1 Year tax returns is doable if you have been self employed for the last 5 years on a conventional loan.

Additionally they might want owner finance with some down for the business, building, or BOTH. 

He initially said that because they were husband's wife he did not have to fill out an application and then I told him that all rental agencies in our town make them do it he grudgingly did it, but he's not said anything about his employment history and he has no current income

If the in-place rents generate don't generate enough cashflow to cover your debt service, you'll want to plan to bring additional equity to the deal to cover the shortfalls.