Who would say this? The Federal government? I'm no lawyer, but essentially, they would be voiding hundreds of millions of contracts (?)
The Government can't just wave a wand and take an action like this. Even if they could, I don't think you would feel very good about this 'eat the rich' approach for long.
Think about it: Why would I as a landlord keep paying utility bills, taxes, insurance when my tenants don't pay me rent? Why would I pay my mortgage? I wouldn't. I would simply walk away. How long after you stop paying rent before your apartment doesn't have running water?
The real estate market would be decimated. Banks would fail. Trillions and trillions in value and investments destroyed. Unemployment would skyrocket. Goodbye recession, hello depression.
A back door approach to this is a moratorium on evictions, which some states have done. Good luck trying this approach if you're a tenant tho. If this crises is shorter than expected, you'll shortly be evicted and carry that on your record.
I think you're operating on the misconception that landlords and businesses are making outsized margins and 'hoarding' wealth. To think that they somehow would have the ability to continue providing you with services and incurring all expenses without any income is naive.
Direct cash payments to all taxpayers is the easiest, fastest, and probably cheapest way to achieve your goals of bailing out those at risk.