You have saved enough cash to purchase a small 2 bed, 1 bath single-family rental that already has a tenant. 

On the document 14, one of her employee got paid 20k in Apr 20, one single month.

Given its age, we’re planning for a roof replacement and two new AC units within the next few years, which we estimate will cost around 15 - 20k in total.Our single family rental, built in 2020, is newer, so we don't expect major repairs anytime soon.On average, the duplex runs about $400–500 per month in maintenance and repairs (including significant repairs like AC replacements), whereas the SFR averages under $100 per month.

Quote from @Andres Triveno: If its as easy as just getting umbrella insurance why do I see so many single family homes with an LLC registered as the owner?

Its 2 properties in 1 single loan.

I currently only have 1 duplex, however I want to set this up right so it will work for any size portfolio.Currently I haveHome folder>multi family/single family/legal documentsInside the multi family I have Name of property-> general property maintenance/first floor/second floor Inside of first floor (the one currently rented)I have, pictures (before and will have after) / lease documents / a spreadsheet with each month, what day rent was paid, if it was late, if late was fee paid?

Too many people are scared of townhouses and condos, but you are protected against a lot of the repairs of single-family or multi-family ownership.

ADUs additions in single family zoned areas add less value than the hands off cost of the ADU addition.  

While it is legally a fourplex on a single lot, there are technically two buildings, a two story duplex and a side by side duplex with a walkway between them.

Originally posted by @Thomas McLaurin:The kitchen photos show only a single basin sink.To what advantage is that when all the kitchen sinks in the past have been a twin basin.