YOU arrive home.

He should look at something like Apartments.com before arriving so he can get an idea of what is available.

Sometimes I arrive at a decision not by choosing an option but by eliminating all the other options.

Other competitors are roofstock, mogul.ooo, arrived homes and more!

When the house was completed and i was given all the receipts and i saw that they match the bank statements we put the house in the market.I arrived about a month later to check the house (as we had a contract and the home inspector of the buyer said that the house has many issues) and i noticed that there are a few things that needs to be fixed - nothing major.I have asked him to fix it and he said he will (i asked him why these were not fixed and he didn't have any smart answer).

Then you apply your tax strategies to arrive at a Net Income/Loss. 

Nothing to do with positive cash flow arriving in your bank account before or during rehab.

The proforma from the seller had 10% vacancy already built in so I used the general rule of thumb of 50% to arrive at that number.

I also seem to recall the mtg was extinguished by a foreclosure of the 1st mtg so I'd guess the City wasn't very happy with the original developer.You are suggesting the city is annoyed with the original developer who came many years before I arrived on the scene; so now they are passing the grudge onto me and my back house? 

Now he could invoice those items in the background and just give you the final total, but if asked for the breakdown and he gives you that you can't beat him up for how he arrived at his number...