If you don't think any sort of fee is reasonable then continuing managing your unit may be in your best interest.Are you also keeping up to date with legislative changes in your area.

The good thing about this is you can do a parent listing offering the whole place, as well as 2 other listings for each unit. 

Most ADU's are one bedroom units and rent accordingly.

Expect to spend another ~$8K for that.If you are planning to close all-cash and bring enough cash with you for operating expenses and rehab, you are looking at a minimum capital raise of about $3M and that is for a cheap 32 unit.

Or are you going to go the safer route for minimal time expenditure like buying a multiplex and renting out 2 out of 3 units?

Hey @Spencer Cuello, so you will find most of us aren't fans of arbitrage.I see you listed NYC so you know that you can't do a STR in the city unless you live there.IE: You need to be onsite, living in the same unit you are going to rent.As per usual...

Right now I own a duplex, I live in one unit and rent the other for $1400 per month.

Living in one unit and renting out the others allows you to deduct 75% of expenses like mortgage interest, property taxes, insurance, and shared repairs as rental expenses, while the remaining 25% applies to personal use.

Question, have you gotten a multifamily unit yet? 

Frank, For a rookie investor with low capital looking to build a rental portfolio, the best strategy is house hacking: buy a small multi-family home with a low down payment (FHA or conventional loan), live in one unit, and rent the others to cover your mortgage.