A lawsuit can run from $10,000 to $25,000 dollars and you would likely lose this one.And most importantly, you have to prove monetary damages. 

It's close to the 45 days, they are current on payments and no monetary penalty was defined in your lease.

But, without a buyer even if you “won” in court how would you establish monetary damages? 

If they can't manage it, have a three way discussion with your agent, their broker and you.By the way, to spend thousands and thousands ($10,000 to $25,000) of dollars to try to enforce a contract and the distraction it creates, rarely gives the outcome you think you deserve, The court will most likely side with the home owner, might award you monetary damages for money spent (not including legal fees) but is highly unlikely to force the sale.  

These are just some of the points that came to mind that it would be difficult to place a monetary dollar amount

Sometimes, the comfort of knowing the tenants aren't going to dump cat litter down your toilets or take a hammer to your walls is worth more than the monetary value.

I just purchased a new home with D.R Horton. no money down. 3.990% interest rate, all closing cost covered, they even paid the fee for breaking my lease early, and it is a brand new home with everything new in it. warranty for all the appliances etc. since I found the house myself, instead of using a realtor. i called the realtor when i was ready to buy, and they agreed to give me a monetary gift.(1, 1.5, or 2% of the purchase prize) you have to work that out with them.

The idea of seeking monetary damages for the time the individual remained in the property post-foreclosure isn’t commonly taught or publicized, even though Connecticut law provide for such claims.

Does the contract include a monetary damages provision?

The end result was I ate the monetary loss including months of potential rental income.