Need help with 4-plex offer

[Donny Random]

I need help to determine the maximum offer I should make on a four-plex that is for sale. This would be for a long term hold. Owner Occupied FHA loan. Manage myself. Tenant pays utilities.

Total Monthly Rent: $2525.00
Annual Taxes: $2532.00
Annual Insurance: $840.00
Annual Maintenance: ???
Vacancy: 5%

Loan Interest rate: 6%
Down payment: 3% of purchase price
Prepaid & Escrows: Approx. $7000
Closing Cost: Approx. $4,700

Did I miss anything?
donny