IF the City does not limit to four total, there is a scenario where the City MAY allow up to 10 total units on single family zoned parcel

Thus, I have worked 2 jobs (1  is self employment) for 7 years to fund purchasing a few single family homes locally. 20k is not enough to purchase IMO, that should be your savings AFTER your purchase.

Quote from @Alan Asriants: There has been a growing trend recently of individuals looking to house hack single-family homes.

Based on a single interaction doesn't always tell you if it is good.

Purchase price: $80,000 Cash invested: $80,000 Single-family residence in Las Vegas.

@Dave Hagen“Also a reminder to all investors with multiple LLCs, or even a single LLC.

We specialize in single family homes, condos, townhouses, and select small multi family homes.

Duplexes are generally valued lower than a single family.

I'm not into Sub2. there is no personal liability protection in a single member LLC.. there is protection if you have unrelated members in your LLC . 

Its very simple to figure out & use and it gives enough metrics to analyze single family properties.