Governments (like the UK here) are trying to borrow then lend money to business like that so that at the other end of this, they can just return to normal.

But honestly I think it's too complex to attempt. Perhaps some form of managed debt jubilee will work "no rent for six months" or something. but the unintended consequences will be huge.

Good luck to your friend

Edit: we should probably focus on the areas that can be easier made whole - finding landlords with extant contracts and just paying them for the contract will be easier than getting their tenants paid, finding businesses with employment contracts easier than paying individuals...