They even ask me to take care of minor issues themselves and send the bill for my approval upon which they subtract it from the rent payment.  

According to the National Association of Realtors the average Flip makes $64,000 Gross and when you subtract costs nets $15,000 and takes on average 6 months from finding the property, fixing it up, putting it on the market to collecting the check.

Usually doors and windows are not subtracted because they take more time to cut out. 

Hi Guifre,Thanks so much for your advice.I've calculated my net cash flow per month to be $160/mo, by subtracting net income $1000/mo minus total monthly expenses.

@EddieMemphis    By 'nailed' I mean he subtracted it from my requested amount.

Subtract those expenses from his security deposit.

It's not going to do you any good to add a fence if it's not standard for the area, but it will subtract from your value if it is normal in the area and you don't.  

Subtract another $800-$900 from cash flow. 

Subtract closing cost and there is no profit to pay capital gains on which means the 30k is tax savings from previous years that you now have to pay back.

However they are slow and they will do their research to determine valuesWhoever the taxing authority is, they will look at the value of the property in its current condition, then subtract foreclosure costs, marketing and closing costs to arrive at a net value to them.