I was going to suggest getting some of the purchase price financed by a bank and some by the seller, but then I took a closer look at the numbers and now I'm not as sure. Lets look at your numbers:
17,000 taxes
+7,500 insurance
+35,000 utilities
= $59,500
If you get a loan at 4.5% for 30 years (and I don't think its possible to do this well) then you have $6,080/month in mortgage payments or $73,000/year and you are up to $133,000/year.
Add on property management fees at 6% of gross rent (not sure about your area, but in mine, this would be bargain bin management) or about $10,000/year and your are up to about $143,000/year in GUARANTEED expenses. (Even if you plan to manage the property yourself, 24 units is a LOT of work and your time is worth money.)
This leaves you with only about $32,000/year for the unexpected and I think that you'll find your numbers are a LOT higher. You will have parking lot and grounds maintenance, legal fees, tenants who trash your place, etc, etc, etc.
Bottom line, if it were me, I would look for a better deal.
Hope everything works out for you!