“Diversification is the only free lunch in real estate."
Markowitz's wisdom has been well accepted and institutional real estate portfolios are built around a familiar logic: diversification, especially by geography and product type. Research confirms the long-term benefits. Pricing differences across metro areas and asset types are uncorrelated enough that diversification drives lower portfolio-level price volatility and improves average returns.
Most portfolio frameworks quietly assume assets can be traded at observed prices, and the benefits of diversification only exist if that assumption holds. But liquidity conditions change significantly and quickly, begging the question: Can a portfolio be diversified to optimize liquidity? A recent research paper asks a similar question that most portfolio models avoid: When markets seize up, does illiquidity stay local—or does it spread?
For large U.S. metros, liquidity commonality is almost twice as strong as return commonality. The pattern holds across apartments, office, retail, and international gateway cities. Tradability itself emerges as a shared risk factor, one that especially spikes in downturns. When liquidity seizes up in one market, it is likely seizing up everywhere.1
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