Comment by ksec

They together with property agency, owner, investors dont want to trigger re-evaluation because it hurts their LTV ( Loan-to-Value ). Which for a set percentage is defined by law along with adequate cash reserve. It is also what causes HSBC to buy its subsidiary HSB. And Bombcar above has already replied. It is rather obvious not something to do with big short but not understand how the financial world of property market works.