They do this and not CAP rates because they don't have access to all of the necessary expenses to calculate an accurate NOI.

Currently, after taking care of all expenses, it is providing about $1400 positive cashflow per month.

She may have minimal expenses.  

I have to work 2.9 full time jobs here in LA just to cover expenses like rent.

You issue the form and deduct his "share" as an expense.

Once I've filled another renter in the 4th room, the Total Monthly Income is around $1,600 and expenses total approximately $1,300 per month.

I know that <5,000 sqft you do not)Legal: $3,500Other: $16,000 (Budget for unforeseen issues)Tap & Capacity Fees: $27,515 Building Permit Cost: $2,391.17 (estimated $706K total costs)Site Plan Review: $224.64 ($100 + $.015 p/ sqft)Wastewater Capacity Fee: $750 per unit x 8 = $6,000Water Capacity Fee: $750 per unit x 8 = $6,000Meters: $300 per x 8 = $2,400Water Tap Fees & Install: $300 per unit + 900 installation = $2,400 +900 = $3,300Wastewater Tap Fees & Install: $300 per unit + 800 installation = $3,200Facilities Tax: $4,000 - ($500 * 8 units, I am assuming this will change as I haven't asked solid numbers )Total Development Costs: $783,785 (8 units costing $94, 848 each, which I think is high)Proforma CF $ - Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Income   Rental Income (Increase 2.5%/yr) 2.50% $ 79,200.00 $ 81,180.00 $ 83,209.50 $ 85,289.74 $ 87,421.98 $ 89,607.53 $ 91,847.72 $ 94,143.91 Vacancy (10% in Yr1) 5% $ 7,920.00 $ 4,059.00 $ 4,160.48 $ 4,264.49 $ 4,371.10 $ 4,480.38 $ 4,592.39 $ 4,707.20 Gross Income $ - $ 71,280.00 $ 77,121.00 $ 79,049.03 $ 81,025.25 $ 83,050.88 $ 85,127.15 $ 87,255.33 $ 89,436.72                   Expenses                   Real Estate Taxes $ - $ 9,000.00 $ 9,090.00 $ 9,180.90 $ 9,272.71 $ 9,365.44 $ 9,459.09 $ 9,553.68 $ 9,649.22 Insurance 2.50% $ 3,000.00 $ 3,075 $ 3,152 $ 3,231 $ 3,311 $ 3,394 $ 3,479 $ 3,566 Trash Collection ($250/unit) 1% $ 2,000.00 $ 2,020 $ 2,071 $ 2,122 $ 2,175 $ 2,230 $ 2,285 $ 2,343 Common Utilities 2.11% $ 2,400.00 $ 2,451 $ 2,512 $ 2,575 $ 2,639 $ 2,705 $ 2,773 $ 2,842 Management Fee (10%) 10% $ 7,920.00 $ 8,712 $ 8,930 $ 9,153 $ 9,382 $ 9,616 $ 9,857 $ 10,103 Repairs/Maintenance 3.00% $ 2,138.40 $ 2,313.63 $ 2,371.47 $ 2,430.76 $ 2,491.53 $ 2,553.81 $ 2,617.66 $ 2,683.10 Turnover/Redecorating 1% $ 2,000.00 $ 2,020 $ 2,071 $ 2,122 $ 2,175 $ 2,230 $ 2,285 $ 2,343 Snow Removal/Parking lot cleaning 2% $ 1,500.00 $ 1,530 $ 1,568 $ 1,607 $ 1,648 $ 1,689 $ 1,731 $ 1,774 Landscaping 2% $ 2,000.00 $ 2,040 $ 2,091 $ 2,143 $ 2,197 $ 2,252 $ 2,308 $ 2,366 Admin Fees 1% $ 1,200.00 $ 1,212 $ 1,242 $ 1,273 $ 1,305 $ 1,338 $ 1,371 $ 1,406 Total Expenses $ - $ 33,158 $ 34,463 $ 35,188 $ 35,930 $ 36,690 $ 37,466 $ 38,261 $ 39,074 Net Operating Income $ - $ 38,122 $ 42,658 $ 43,861 $ 45,095 $ 46,361 $ 47,661 $ 48,994 $ 50,362                 Property Value @ 8 CAP $ - $ 476,520 $ 533,223 $ 548,258 $ 563,686 $ 579,517 $ 595,761 $ 612,428 $ 629,530 Obviously, Once I account for my debt service (DS), say $758,000 @ 5.25% for 240 months ($5,108 p/ month), I am under water.Year 1 NI [$38,122] - DS [$61,296] = -$23,174 = Meaning I cannot do this project.......

This property had an expensive policy for vacant house and long renovation.   

., I would expect 25% down with (i believe) a 6 month expense reserve in "the bank". 

We chose to spend a non-trivial sum, something like 15 years of flood insurance premiums, to re-slope the drive way (the big expense) and lawn and build a levee near the house to keep water away.