I personally have two entities that aren't in the note "business" (in terms of originating or modifying mortgages), the entities merely own the assets as an investment and the notes themselves are serviced by a licensed servicer.

And, at this moment, in terms of property, this is all I am interested in. 

This is not about gum vs REI as much as thinking in terms of business returns overall.

I believe keywords in your domain still makes a difference in terms of SEO.

Some local banks will let you get a credit line that you can tap as you pay down, so you keep adding properties to this credit line and it keeps growing in terms of total credit availability.

To put in terms I am familiar with, you have to learn how to ride a horse before you can become a world champion rodeo rider who retires in 8 years. 

Let me lay out my situation here a little and get some feedback.I currently own 2 multi-family properties that are doing quite well in terms of positive cash flow.

The land is about 90% developed with major utilities in place including sewer, and most concrete in place in terms of pads, street, and curbs.  

I want to know what should I expect in terms of gross earnings$$$/unit managed as well as net earnings$$$/unit managed?

For one thing it is in Passaic County which has nice areas but is not good shape in terms of management, taxes, fiscal responsibility etc.As others pointed out it is not a good area (C- or D) so you have all the problems with that type of market if you are buying and are not local.