Quadplex seems to be cashflowing 1k a month. What am i missing???

[Kevin Whisler]

Turnkey  4 Unit Property I found: Occupied and makes $3900 a month confirmed currently.

Principal and Interest: $1154

Property Tax: $480

Home Insurance: $125

Vacancy- 7.5%: $312

Repairs- 7.5%:  $312

CapEx- 7.5%: $312

Prop. Management (I would do myself at first)- 9%: $351

**I went a bit higher with my percentages to be conservative**

That puts my overall expenses at $3046

So if I hired a  prop. management company I would be netting: $854 a month for the building: $213.50 a unit. 

If I did property management myself, I would be netting: $1205 a month for the building: $301.25 a unit.

Does anything sound wrong? Am I missing anything? Why has no one else taken advantage of it?