@Drew Denham
Sometimes the price might be worth the gamble but keep in mind, location....location...location, then what is appealing about the old house, and lastly will the property cash flow after the rehab?
I had an old mansion located in a historical part of town that was converted into a 6 units. Spent $350,000 on it and had to rehab it. The mansion had a lot of character and the location was close to a hospital, very hip little shops, bars, restaurants and parks etc. I never placed an add in the paper to rent. I put a sign out front and I would have an unbelievable amount of people respond to the sign. The property was a cash cow.
If the house is in a good location and there is something appealing about the old house it might be a good buy. Make sure you find out what kind of repairs you are going to have to put into the property and then find out what kind of rent you can get out of it. The bottom line to purchasing a investment property is cash flow.
Good luck.