Is this a good deal?

[Bryan P.]

I have a coworker that is wanting to sell a duplex. It's worth about 65k. She's willing to owner finance to me with 5,000 down at 6% interest for 17.5 years. The PITI for the property would be around 600. The currrent rent for both sides is 450/month. I'm thinking the rent is too low and should be raised to 500/month. This means the gross income would be 1000/month. That goes over the 50% rule. The place is in good shape with no major renovations (that visually need done immediately). Do you think this is a good investment even though it doesn't meet the 50% rule?

To give some background, I'm 33 yrs old. Own two rentals. One is easily meeting the 50% rule and the other is not (it's at about 85%, which is ridiculously high, but it used to be our primary and it's going to be paid off in 6 years. I'm hoping to keep it under control for those 6 years. I hope that's not wishful thinking)