I eventually moved out of the top floor and now have both units rented out that produces me a positive cash flow after all expenses.

The bottom line is he couldn't produce the results you wanted when you wanted them. 

I guess though it all depends on how much more you can handle to spend and what that new higher amount produces for results.  

Seems they too are too lazy to learn, want something quick and easy to produce creating their income stream.

Hook up with a top producer who will show you the ropes.. or work for a commercial brokerage.. if you truly want to do this full time..

Have your marketing efforts produced results?

It made me wonder how the owner/buyer determine the value, using comps (residential) or based on the income the package of properties produces (commercial).

CLE is electric lately, it offers a unique investor position, you can define assets under $100k in suburban neighborhoods producing well over $1,000 month rent, I suppose it depends on your investment strategy.

I need help producing a contract.

Peter,Fair value for duplexes and good income producers are two separate things.