They have a relief fund for Superhosts who are struggling to make ends meet.https://www.airbnb.com/superho...

Although the Notice is confusing, because it is not written like the typical Disaster Relief Notices, this Notice extends any 45-day or 180-day deadline that occurs between April 1 and July 14, to July 15, 2020.COVID-19 Extensions-April 9th IRS notice released-NOT follow typical Disaster Relief 1031 Extensions: broad & confusing -EXTENDS: deadlines to July 15 if either identity or close on a property between April 1 and July 15-This may not be the final draft of this notice. 

Is there financial relief other than the EIDL which is a loan and must be repaid? 

Sad but a relief for you, I'm sure!

Foreclosure is also not the best method of relief, but it at least makes more sense than a bankruptcy.  

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Because the plaintiffs became obligated to pay the fee after they were already tenants, they may not turn to section 15B(1)(b) for relief."

That said you did everything right and limited your liability (I am not sure how much out of pocket expenses you incurred but I usually include in my contracts that I might get some financial relief on my inspections if I uncover a like same disaster and I put out $ for further investigation).

The art of this business is the ability to create and negotiate a solution for the seller that will give them relief and also one that creates equity or cash flow at a deep discount.

The borrower would then have an obligation to make payments or the mortgagee could file for relief.