Evaluating numbers on a 3-unit

[Jonathan Johnson]

Hello BP,

I'm running some numbers on a 3 unit that I'd like some advice on. It's a duplex with 2bd 1.5ba each unit, with a small two bed 1 bath house on same property. 

Here are the numbers I've crunched:

Asking Price: $168,000
# Units: 3
Estimated repairs: $1000 in cosmetic 
Rents: $1450/mo. $500 for duplex apts, $450 for small house. I believe they are all rented already. The rents are on the low side for the area, which is about $600-750 for 2bd/1ba and $450-600 for 1/1.
Vacancy @ 10%/yr: $1800
Maintenance @ 15%/yr: $2700
Taxes/yr: $2,032
Insurance/yr: $1000? estimated not quoted
Mortgage/Mo: $1024
Mort/Yr: $12,284
Profit/yr: -$1,816

Profit/yr if rent upped to $600, $600, & $550: $434

Profit/yr if rent upped & asking price cut by 30% (117,250): $3,210

Now, I know the vacancy and repairs are unforeseeable, but necessary to save up for. Anything I need to worry about in my calculations? Am I too unrealistic or inaccurate in any areas? I'm obviously going to ask for a lower price, but I wanted to see what you all thought.