duplex, ohio, cash flow deal analysis

[Jinglei Shen]

I am building my investment portfolio(duplex) in Ohio Cleveland, a few properties i have analyzed  with net cashflow  around $100 to $290 

here is one deal I am analyzing

Duplex generates $1590 income /month together,

purchase price $123,000

rate 7.5%, downpayment 25%

5% vacancy, 10% mgm fee, $1400/year insurance,10% capex, 5% maintenance,

COC is 8.73%

monthly net cash $277

this deal meets1% rule, bring in positive cash, my question is it in normal range in Ohio Cleveland market?