The requirement is that the house meet habitability standards, and building code standards say a house must be pest free to be habitable.

Primary residence mortgages require you sign documents stating it will be your primary residence and you'll live there at least a year.

The bill requires that cities allow up to 10% of the commercial properties (strip malls for example) to be repurposed as multi family residential.

For example, certain states like CA and MA have "claw-back" provisions, some states have withholding requirements, PA has some funky 1031 exchange laws, etc.Work with a rockstar QI (like @Dave Foster) and a real-estate-savvy tax professional to ensure you don't fall into any traps.

You may have to sell the whole property to access the funds in the IRA or 401k when you retire and for required minimum distributions. 

As is was mentioned above Fannie/Freddie require 12 months before you can use the new value to walk away with cash.

If your using financing the bank requires this.

Self-managing the STR has some great tax benefits if you meet IRS requirements.  

in Oklahoma is a real estate license required to manage properties?

If it is interest bearing than most states require that a portion of the interest goes to the tenant.