@Jason Leong there is nothing wrong with verifying that your employees or agents are doing a good job.

I assume that you have never had a property where the gross income dropped by more than 30% before... 

If you had to borrow the whole amount, and factoring all the usual expenses (say, 50% of gross rent as a rough rule of thumb), would it be positive cash flow from day one?  

:)THE FRONT DOOR APPROACH:Potential Gross income - vacancy & collection + operating income = effective gross income - operating expenses = net operating income - annual debt service = before tax cash flows***is this correct for the formula for the FRONT door approach?!?

Do you run the calculation against gross rent or net rent? 

To determine value of this deal, first find the NOI (gross income-expenses).

It's near 20 percent of gross rent, if I'm calculating right. 

  $1800 gross rents. 

Asking $270KMonthly Rent Roll is $2300Taxes: $3k (i'm not sure why so high)Insurance: 1K (assuming)Prop mang: $2760 (10% of gross rents)Maintenance: $2760 (assuming 10% gross rents)Tenants pay all utilities and lawn work.

try to intern at pm company with plenty of units, it is a low margin business that you need high volume to make money imagine you have a million dollars of rents managed you only gross 80 to90 k minus your overhead,plus its 24 hours 7 days a week