Small apartment buildings v. 3/4 family near Boston

[Eric Sugrue]

Hi all,

I'm looking to rapidly replace my w2 income with rental property income.  The goal is to be fully retired within 9 years (May 2030 is my target date.  Sooner would be excellent).

Weighing the pros/cons of owning multiple 3-4 unit dwellings v. small apartment buildings (10-20 units or so).

What are folks experience with commercial financing for the larger buildings?  

What kind of cash flow can be expected with apartment building when managed properly?

What else should I be considering?

Any and all of your input will be greatly appreciated.