Corporate bonds are 10%+.
RE lending, especially in this environment, should be at a premium to corporate lending. So say the rate is 12% for debt.
Equity probably, in this environment, costs 20%.
So the blended cost of capital is likely in the 15% range.
That means a building (such as a house) will have to return the cost of capital, in order for such a business deal to make sense.
So, from current levels, I'd say the real estate market has dropped 80% in the past few weeks.
Of course, much of it is 'no bid' ('no bid' might very well mean $0), but unless the government manages to induce inflation ASAP, pretty much every leveraged owner is on their way to default as the economy shuts down.
IMHO, we'd all be better off paying $300/barrel for oil in the next few years, than we would be with complete industrial collapse. $300/barrel oil would be far more orderly and would let the market move capital and savings towards the market participants that build/own energy infrastructure, and would encourage inventory builds, instead of just collapsing all industrial production (and all the war/disease/civil unrest that causes)..