Do you think the buyer can get out of contract?

[Roger R.]

I had a contract that was set to close on the 3/28/20, time is of the essence.  COVID-19 his and the world stopped along with all NYC courts closing for non-essential business, so I couldn't enforce the contract.   The contract stipulated that one commercial lease had to be in effect at the time of closing.  On June 29th my lone commercial tenant went bankrupt and vacated their lease.  

 Does this let the buyer out of the contract even though they passed the original set in stone,  closing date?