Hi @Alex Lee I would avoid 203K loan and work with conventional renovation loan based on knowing you'll be forced to use 203k certified contractors which will cost more money and offer inflated pricing because they must follow 203k guidelines. 

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

To qualify as an RE Pro you must:1.

The lot works and ok with living in one unit, just trying to find people that have executed them in Los Angeles City.

Yes, as S-Corp owners deferring salary into a Solo 401(k), you must still pay FICA taxes (Social Security & Medicare) on the deferred income since FICA is based on W-2 wages, not taxable income.

They must satisfy "material participation" test for their STRs to utilize the strategy.

we're trying to protect you and your family - hence the 'suspicion' =)

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

They are just regurgitating marketing 101 trying to sell the holy grail. 

To thrive in real estate investing, you must maintain a firm grip on your finances.