How CPI-linked leases can navigate Japan's rent inflation

Inflation has become increasingly evident in the Japanese economy. Prices have risen across a wide range of goods and services, and are now affecting the real estate market. Inflation is measured by the Consumer Price Index (CPI), an economic indicator that tracks changes in the prices of goods and services purchased by households.

In overseas markets, lease structures incorporating periodic rent increases are widely adopted. In the United Kingdom, upward-only rent review clauses, introduced in response to inflation risks following the oil shocks of the 1970s, are used in long-term leases. Under this structure, rents remain unchanged when market rents decline but rise when market conditions improve.

In the United States, some markets have leasing contracts that employ annual rent escalation clauses. This allows for predictable rent increases while remaining responsive to market conditions.

In an inflationary environment, fixed rents would decline in real value over time. Against this backdrop, CPI-linked lease structures can be viewed as a rational mechanism for sharing inflation risk more equitably between landlords and tenants. This avoids placing the burden solely on one party. Both parties benefit from a clear, market-based adjustment rule. Landlords benefit from value protection as property income keeps up with rising general prices. Tenants benefit from predictable costs as rental changes track official inflation data.

Tokyo Grade A Office rent in the central five wards increased by 9.4% in 2025, with the vacancy rate at 0.7%, indicating a highly constrained market in which demand continues to exceed supply. Landlords are therefore seeking to maintain asset performance by securing leases at appropriate rent levels. In some cases, tenants have faced rent increase requests of 20–30% or more at the time of lease renewal or renegotiation, prompting some of them to relocate to more affordable office space rather than renew. Supply-demand conditions in the Tokyo office market are expected to remain tight. JLL forecasts that rents will increase by more than 15% in 2026.

Figure 1: Tokyo Grade-A office rent and vacancy rate

By comparison, Japan’s CPI, excluding fresh food, was 3.1% in 2025. Under CPI-linked lease structures, rental changes match CPI inflation at set intervals. Compared with sudden rental increases at lease renewal, this arrangement leads to more gradual and predictable rent adjustments, allowing more effective budgeting.

For example, if the monthly rent for Grade A office space in Tokyo—JPY 38,252 at the end of 2025—were to rise by 3% annually, it would reach JPY 43,053 in the fifth year, a cumulative increase of approximately 13%.

Figure 2: 3% Annual increase scenario (five-year rent illustration)

In a rapidly rising rent environment, CPI-linked leases offer greater predictability than large, one-off increases. However, tenants should be mindful of potential risks. In practice, negotiating caps on annual rent increases to mitigate high inflation, and considering potential floor provisions requested by landlords, will be important factors in future office strategies.