If they do have that cash laying around, hopefully it's not stored on-premises.
Seems like the agreement could be backed with the threat of a lien on your property.
The property that just burned down?
The fire brigade would borrow the technique of Marcus Licinius Crassus and buy your property as it burned, improve its value by extinguishing the fire, then rent it back to you.
Presumably they would save it by extinguishing the fire then if you can't pay the cost of the service they take the property or place a lien on it.
If the firefighters can't keep it from burning to the ground, I doubt you want to be paying for them to do anything.