Hi Ryan
I agree that this may be promising on first glance but I think that you need to get/give more information before deciding if this is really a deal. I would take a closer look because this appears to meet the very crude 1% rule at rent of $1800 and pp of $170k, but I wouldn't call the ROI without more info.
The statement of "expenses" is too vague. You should be able to easily get a breakdown of what the taxes and insurance are (and confirm by calling an insurance agent and checking online public tax records), but this is just the starting point. To really know, you have to factor in other costs:
--any landlord paid expenses, include lawn care etc
--vacancy-- I also use 8% of gross rents as rough estimate
--set aside for capital expenditures- I use 10% as gross number, but to really know you if you should move this higher will depend on age/condition of roof, HVAC, and other major systems
--set aside for repair--again, I use 5-10 % but very much depends on how recent the rehab is, condition of units, etc. Also factor in your own/your dads "handiness" level. My partner can handle most common repairs (plumbing/electrical/etc) so can shave off a % or two, but if you will be relying on an outside repairman for all, then you have to be honest and bump it up.
--always factor in property management even if you don't intend to use it, depends on your area but in mine can get a decent company for 7.5%, other areas are higher or lower.
you can use the BP rental calculator (look under tools), among others, to plug in these numbers and play with different scenarios.
You need all this to get an accurate cash ROI number and determine how much you want to offer. After all is said and done, I would VERY much agree with your caution in dealing with a unit that's been on the table since August---esp. in todays hot multi market--- I wouldn't completely discredit it (some of my best buys have been units that others passed on for whatever reason), but I would definitely dig deep before committing.