Questions about the 50% rule with mutli families.

[Evan Smith]

I have been taking the 50% rule more seriously after a few deals I had werent the greatest and I got stuck with properties that I believed the income would be much higher. I found a couple of off market 4 unit properties and they look like they cashflow really well but im afraid that they dont make sense. I am saving 35% for repairs, vacancy, expenses ect. It seems like what im saving should be sufficient but im really not sure. The buildings are older in general (1900s) but the roofs, water heaters, ect are relatively new. Here is an example of a deal I have lined up. Let me know if you think im budgeting too low or good enough. 

200k for 4 units, Total gross income a month 3325. Loan/taxes/insurance monthly is $1300. Im saving $1163 a month for expenses, which is 35% of gross but im managing myself and the taxes are rolled into the mortgage fee. Does this saving seem low for a 4 plex? My CoC at a 35% gross savings is roughly 15%.