I was using $500.
I'll list so far what i've spent on properties
IP1 - $398.20
IP2 - $489.00 (This is about to increase dammit lol)
IP3 - $234.40 (Only rented since Nov 09)
So i think $600-700 per prop per yr for myself would be a good guideline
Issues IP 1 - Dishwasher and electrical
Issues...
