One way might be buy calls on ETFs with a low correlation to real estate and/or buy puts on ETFs with a high correlation to real estate.How would you use futures and options to hedge against a real estate crisis?
To help find these, see the attached semicolon-separated IYR_correlations.csv that has recent, three-year, daily return correlations (QUantDare method) of iShares U.S. Real Estate ETF (IYR) with other ETFs.