I'm a STR manager and have a few arbitrage units myself.

Related to this, please also make sure and get a utility planning study done as part of your feasibility process.

This is probably resulting bias, but I feel that this general rule of thumb has served me pretty well.How is this related to rental properties and tenant screening?

How many rentals do you currently own and manage?

I also recommend self-managing this property so that you can get that experience.

How will I manage this investment property?

I’m managing a rental property for an out of state landlord.

"She doesn't boom but she doesn't but either"The only issue I see with your strategy is scalability. 20-40 units often get crushed with expenses because of the lack of economies of scale. 100+ units are actually easier to manage :)Happy hunting!

You will build skills and experience in acquiring and managing the duplexes that will help you with real estate projects large and small. 

I just bought a building with my sister where we are 50/50 partners but I am managing as it is in my location.