Because I own businesses in other fields its great to wall off the software by company from the employees view but from my vantage point it's one system that reaches people in all parts of the organization, allows us all to work together on projects and enhances inter office communications.

If you're set on long term single family investing in the Phoenix area, you might consider ways to enhance your cash flow, such as:Vacation rentalsStudent rentalsGroup homesOffering lease options / seller financing

And then their ceiling texture started to peel off at different places soon after they moved in so naturally they want me to repair it.

It's just as labor intensive as removing the texture, but doesn't require any special licenses since original stuff isn't disturbed.One other thing I was told is that if you test the ceiling, it comes back positive, and you don't abate - I believe it becomes something that you'd have to disclose when selling (if that's your plan).

I know it's a mess and would have to texture it again and paint.

I also think creating additional cashflow income to better enhance your own real estate income makes even more since. 

Alex, there are many reasons for getting you license, and I'd suggest you consider whether you're intending to use it to enhance your investing career, or if you would like to use it for the purposes of being a Realtor?

Finally, depending on your return strategy and risk spread, different markets is something you may want to consider, for example you may want to spread your eggs beyond your immediate territory to enhance your buyers market experience, I know I may open up a bag of worms with my next statement, but consider turnkey operators in different market to help enhance your buyers market experience.

Or, do I just assume all wall behind a bathroom wall needs to be textured?

I am working hard to enhance my knowledge of discounted cash flow modeling for portfolios/complex capital stacks in ARGUS, CMBS securitization, syndication and commercial construction/development.