Sorry, no, it applies to all rentals. There are a couple of long, sticky threads in the Rental Property forum about this rule. Several people provided data that consistently confirmed this rule of thumb.
Its not the price of a property that makes a property, well, "low rent" or not. Its the rent. $1500 would be pretty high for a 3BR in my area ($900-1000 more typical), but its still hardly a high end rental. Further, as one member recently reported, high rent doesn't always translate into high quality tenants. Students certainly don't typically fall into the high quality tenant category.
An old-school rule of thumb says rents must be at least 1% of the purchase price. That translates to 12% of purchase price per year for gross rental income. Subtracting off 50% of that leaves you 6% of the purchase price per year in NOI. If your interest rate is higher than 6%, you'll be negative cash flow with just the interest, let alone any principle payments. So, this rule of thumb really depends on containing expenses and getting some appreciation. Containing expenses almost always translates into limiting maintenance, since that's the only expense you can control. And that's why so many rentals are crummy. Then, long term appreciation (which is driven mostly by inflation), makes for a payday when you sell.
I'd rather find better deals than that.
If you can dump this deal to IU at a profit, I'd do it. Why try to leave some money on the table for another investor if you can easily grab it for yourself. Plus, I doubt it will generate much profit for an investor. The transaction costs on real estate are exhoribiant (vs stocks, bank CDs, etc.) The cost of money to hold the investment is high. You're really talking fix and flip numbers. If you sell it to someone for 80% of what IU would pay, they might net 10% of the IU price for a (taxable) profit, after all the costs. If you just sell it to IU for that price, you'll grab that entire 20%. Go for it!