Also be aware of Unrelated Business Income Tax (or UBIT) on leveraged real estate inside of an IRA.Or better yet, since you are self-employed - go with a truly self-directed Solo 401k plan, which would be a much better option and will help you avoid the UBIT on this investment.

I was their best option.

Personally, I wouldn't offer SubTo or a Wrap, For reasons I've written about fairly extensively. https://www.biggerpockets.com/forums/70/topics/1227199-the-m...However, I would sell on "Lease Option" and that may work for you.

I had two real options, University of Oklahoma or Oklahoma State University.

There are a few options(1)You can get connected with the larger wholesaler firms in the area (2) go through PCPAO site and skiptrace the buyers of similar properties as yours, (3) hunt down the agents involved in the sale of properties similar to yours or go to local REI meetings and pitch it to the investors there. 

Seems to me my options are...SELL - If I were to put it on the market I think I could reasonably get $2.8M - $3M, but at a 2.9M sale price my return on my initial investment is only 38%, or 7.6% a year over the 5 years.

The best option is to respond quickly and professionally in hopes that they move out.I would give the tenant two options: 1. vacate the rental in one week, leaving it in the same condition as when they moved in, and I will refund their deposit within 72 hours; or2.

Explore the possibility of doing liability insurance instead, if you don't have much equity it may be your best, and much cheaper option.  

Note these are only residential options. 

Credit is a factor as bad credit may limit options, or may have the lender require you to put 10 or 20 years of taxes and insurance into escrow.