Could anyone with experience in this situation explain some good ways to make use of that third apartment? 

The hard part is finding deals. 

Then make excuses about being busy, having other interested parties, you don't accept pets, or whatever.

There is nothing in the management agreement relating to soliciting 3rd party quotes.

She did make all parties aware in this matter. 

This home was added onto in 2012, so part of the home is new and the other part is from the early 70's.

This home was added onto in 2012, so part of the home is new and the other part is from the early 70's.

Does the cost of using the VA loan become more expensive using it the second or third times?

When your bid is recognized as the low bid on the Results Page, you are obligated to pay for the certificate even if the bid was unintentional.Doesn't say what happens if multiple parties bid to 0%, so I assume it's the first party to bid the lowest. 

I recently purchased two rentals and I have a third under contract.