Have you worked through the rental property calculator in the Tools section? Also, where is this property located? You should find out the market cap rate for similar properties in the area, to compare your projected cap rate.
Also, have you gotten the current financials from the owner? It's important to know how the property has actually been performing. Either get the most recent 12 months of income and expenses, or at least last year's income and expense report.
Did you get the 50-60k number from a contractor? To be honest, it sounds low for the work you're describing.
Here's my quick, back-of-the-napkin analysis: 1,100 per unit, and 800 for the one bedroom (just a guess, since you didn't give an estimate for that unit), and 5% vacancy
Annual income: 147,060
35% of income is a good starting point for expenses: 51,471
NOI: 95,589
That's an 8.6% cap. Did I miss something?
Also, I manage about 200 bedrooms in Corvallis, OR near OSU. Students are a special breed of renter. They're profitable, you just have to have to be more proactive with them, get large deposits, have cosigners, and plan on doing a lot of repairs at turnover. The fact that all your units turn over at once means that season will be very busy. Most college towns have a season during the school year when most units are pre-leased for the following year. It can be high-pressure, because if you aren't fully leased by the end of that season, you risk having a unit sit vacant all year.
You're on the right track!