Musk renewed his warning about the brewing crisis in U.S. commercial real estate and the broader housing market。Musk's South African fellow friend and former PayPal COO David Sachs retweeted a tweet about the commercial property crisis in Los Angeles, saying that "Los Angeles office buildings average $230 per foot in debt, and the only building sold this year is at $154 per foot."。lost a lot of money。Los Angeles' biggest landlord, Canadian giant Brookfield, has defaulted on more than $1 billion in loans this year.。Sachs commented: "Los Angeles office buildings are selling for less than the debt they carry.。So is San Francisco and other big cities。Musk commented: "Commercial real estate is collapsing fast, and next is home prices."。