Help me analyze this deal

[Marsha Rost]

Please let me know if you think this is a good deal.

It is a 2100sf single family which I want to convert into a duplex

Est rent for both units $2600

Cash Purchase price $240000

Repair costs $50000

Monthly tax after repair $550

Ins. $150

Vacancy 5%= $130

Capex $200

Property management 10%=$260

Repairs 5%= $130

If I refinance and cash out at 70% (assuming it is appraised for a little over $300000) and 5.2% interest rate monthly mortgage would be $1100

Please let me know your thoughts. Thanks.