All of this is wrong. Leaseholders are holding out for higher rents not because of taxes but because of property values and the corresponding loans they have.
If they rent out something for a discount, it will read to a reevaluation of their entire property, which would then lead to them being underwater and impossible for them to borrow more money.
This is true not just in New York but all of the US where property owners are heavily indebted and rely on debt to both grown and maintain their businesses.
Having to default means that they basically can’t borrow anymore and can’t continue their businesses.
It has nothing to do with taxes, which would drop if they rented out their property for less.