Your explanation of events is long and a bit difficult to read (you may want to shorten to encourage more responses), but I would try to go over this person's head/chain of command and complain that they did not explain that the $100 was non refunadable. 

Get them out or raise the rent to cover the additional cost/frustration of them being difficult.  

Fernando, that's very difficult for someone who doesn't know you at all to tell you what to do. 

There is a lot of B and C class buildings and most will require some rehabbing to get into rentable condition; however, once they are ready you can easily fill them with students.One of the challenges I've seen is the cost is high and can make it difficult to cash flow at the end of the day.

I am also planning on using an FHA loan, which has made the process more difficult. 

Yes they are moving but they have a child which will make it a little more difficult to move again.  

I'm finding this to be a very difficult task.

A short-term hold can make it difficult to argue that you did have the intent to hold, but if you could demonstrate that you did in fact have the intent to hold for rental or investment purposes but that you got an offer out of the blue that you could not say no to you would qualify for 1031 Exchange treatment. 

I've done some digging -- apparently it is very difficult to get your show on Spotify.  

The majority won't qualify for traditional financing, hoping that funding won't be too difficult to secure if the deal is good enough.