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Protection and supply

Strong evidence

Rent control can protect covered tenants while shrinking the rental supply.

San Francisco's 1994 expansion made covered tenants more likely to stay, but it also led affected landlords to convert or redevelop regulated rentals. Good policy must account for both incumbent security and housing availability.

What this does not mean: This does not mean tenant protection has no value. The strongest evidence distinguishes directly observed tenant and landlord responses from model-based estimates of citywide rents and welfare.

Figures from the papers

Inspect the published evidence directly

Figure from the paper

Figures 1a and 6a · Tenant and landlord responses

The paper separately traces covered tenants staying longer and renters leaving treated buildings.

Published chart showing the rent-control treatment effect on covered tenants staying at the same address over time.Figure 1a · Tenant stability
Published chart showing the treatment effect on renters remaining in rent-controlled buildings over time.Figure 6a · Rental supply response

Source: Diamond, McQuade & Qian (2019), Figures 1a and 6a; PDF pp. 39 and 44.

Read carefully: These are separate tenant and landlord outcomes, not one net welfare measure. The charts retain the authors’ original outcome definitions.

Evidence stack

Studies behind this conclusion

Diamond, McQuade & Qian, 2019Peer reviewed

The Effects of Rent Control Expansion on Tenants, Landlords, and Inequality

Rent control increased stability for covered tenants, while affected landlords converted or redeveloped buildings and reduced the regulated rental supply.

Covered tenants were 10–20% more likely to remain; treated rental supply fell 15%

Keep in mind: The often-cited 5.1% citywide rent increase is a structural-model estimate, not the direct reduced-form rent coefficient, and the policy is specific to San Francisco.

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