Now with time and rent growth, what could be a negative cash flow property might very well become a cash flow king, but that takes patience.Another way to increase cash flow would be renting out rooms in the unit you live in, either Airbnb or longer term.

This seems a little different because in this case the unit is still zoned properly as a two unit but the additional bed and bath are not there as far as the town in concerned. 

(Supply is also going up, but not fast enough to stop the rate of rental increase.)

Numbers appear high level comparable to the ones above, though both purchase price and renovation need to be financed on hard money, significantly increasing the carry costs.

My concern is more about if Wholesale dealer will accept those property and actually pay me the cash?

He would get his first property for his portfolio, and I increase my cash flow by knocking out my biggest expense (rent).

Does clearing away years of overgrowth that has actually starts to affect the integrity of the structure and allows the house to be seen an actually entered increase the value measurably?

unless the neighborhood is gentrifying, C Class is probably not going to increase in value very much.What about the condition?

It might sound like a subtle difference, but keep in mind that the property has to appraise for that increased amount that the seller is crediting back to you. 

Do you look for properties in "good" areas or are you not too concerned with it?