There are some exceptions as to when you can get away with a single stair (full explanation below) but you'll see it is not easy to do.I actually used to live in/rent a third story attic space with a single stair, and as a tenant I thought it was fine.

The SFH and the 1b/1ba ADU are currently occupied by tenants under RSO and paying far below market rents.

We plan to rent out the basement on a medium-term basis - we are going to install a full kitchen down there, put a lockable door between upstairs and downstairs, fence off a private section of the yard, and there is already laundry down there, so it will essentially be an up-down duplex with a separate walkout basement entrance.

And is walking into a turnkey ready to rock building, the seller (whom I am presuming is now broke, but that may not be the case) even left the tables and chairs behind, all ready to have plates full of unethical inorganic genetically modified red meat dipped in butter placed on them. 

For example 4 unit with 2/1s rents for $850 a unit and building sold for $230k

I live in one and rent the other for $400 cash flow.

I have befriended a real estate agent (who has become a true friend) and her son (who has aspirations to get started in real estate as well) and he has a house that will be vacant and is looking to rent it out.

I have been reluctant to even consider renting it out until just this week. 

I'm a landlord and home owner but my girlfriend and I are planning to move to LA in July and rent a place. 

I am looking at Zillow to find properties to rent.