3 Common Mistakes In Every Lease

CPI 1914 TO 2020

Whether you rent office space in a Class A office tower, warehouse space to store inventory or retail space for your coffee shop, your lease probably includes terms that are not good for you but that you agreed to anyway. This article exposes three common lease mistakes and explains that unless your lease language is clear on every detail, even small mistakes can be very costly.

Leases Tied To The Consumer Price Index

Leases Tied To The Consumer Price Index, lease mistakes

The history of linking rent payments to inflation became strategic in the days of 1970’s high inflation when the OPEC oil embargo caused oil prices to skyrocket. When higher oil prices combined with the wage-price spiral, the result was an overnight jump in inflation from 3.2% in 1972 to 11% in 1974. This caused landlords to realize that rental income did not retain its purchasing power, which is the economic theory that a dollar in the future should buy the same amount of goods as it does today. Today it is common practice for leases to include consumer price index (CPI) language to protect landlords, but the problem is that there is more than one Consumer Price Index and there are different ways to calculate each. Even sophisticated tenants and landlords depend on experts to advise them in lease negotiations.

Will The Real CPI Please Stand Up?

inflation and prices

Here is an example of the lease language used by $2.6 billion market cap Regus PLC  in 3,000 locations:

If this agreement is for a term of more than 12 months, the Provider will increase the monthly office fee on each anniversary of the start date. This increase will be by the local Consumer Price Index or such other broadly equivalent index where a consumer price index is not available locally.

This Regus lease language leaves lots of room for dispute because the Consumer Price Index has several ways of being calculated. The CPI index is produced by the Bureau of Labor Statistics, under the United States Department of Labor and the four types of Consumer Price Indices are:

All Urban Consumers (Current)-Consists of all urban households in Metropolitan Statistical Areas (MSAs) and in urban places of 2,500 inhabitants or more. Nonfarm consumers living in rural areas within MSAs are included, but the index excludes rural nonmetropolitan consumers and the military and the institutional population.

Urban Wage Earners and Clerical Workers (Current)-Consists of clerical workers, sales workers, protective and other service workers, laborers, or construction workers. More than one-half of the consumer income has to be earned from these occupations, and at least one of the members must be employed for 37 weeks or more in an eligible occupation.

All Urban Consumers (Chained)-The urban consumer population is deemed by many as a better representative measure of the general public because 90% of the country’s population lives in urban areas. Using chained CPI means the rate at which Social Security benefits tick up would be slower, because it reflects substitutions consumers would make in response to rising prices of certain items. It utilizes a basket of goods and services that are measured changes from month to month; much like a daisy chain. If the cost of a certain form of transportation goes up, people might switch to another kind and this kind of “substitution” is part of what is factored into chained CPI.

Average Price Data– Calculated for specific items such as, household fuel, motor fuel, and food items.  Average prices are best used to measure the price level in a particular month, not to measure price change over time.

The most common CPI Index is the All Urban Consumers Index, but it has two methods used to calculate the numbers: one uses a base period 1982-1984 as 100, and the other method uses a base period of 1967 as 100. Most leases make the mistake of not being clear about which index is used. In addition, the data can be seasonally adjusted or not seasonally adjusted (which is released faster).

consumer price index

Make Your Lease Clear On How The CPI Is Calculated

Here is another example of lease mistakes—the language for a medical property that makes the CPI data source very clear:

Consumer Price Index: It is further understood and agreed by and between Lessor and Lessee that, commencing with the first day of the second year of lease, the monthly rental as set forth above will be adjusted upwards at the beginning of the second lease year, and every year thereafter until expiration or termination of the lease using the all urban consumers (CPl-U) United States City Average, All Items, (1967=100) published by the Bureau of Labor Statistics, United States Department of Labor (referred to as “Consumer Price Index”).

Compound Your CPI Adjustments or Add Together?

Year CPI Rent Annually
0 3.00% $100,000
1 3.00% $103,000
2 3.00% $106,090
3 3.00% $109,273
4 3.00% $112,551
5 3.00% $115,927

Always compound if you are the landlord and never compound if you are the tenant. When adjusting for the CPI, it makes a difference if you add the inflation rate for each year rather than multiply the rate by the previous year. Assume a 5 year lease renewal where the CPI was 3% each year for the previous 5 years. Some landlords multiply 5 years times 3% to get 15% for the increase. For a large property with rent income of $100,000 annually, the adjusted rent would be $115,000; however, if the lease is written so the CPI is compounded, meaning each new year is applied toward the previous year’s CPI, the result is rent of $115,927 in year 5. Your lease renewal should spell out how the CPI is calculated.

How CPI Affects Property Value

How CPI Affects Property Value, lease mistakes

Our economy today is driven by a different wage/price spiral which causes low inflation. This helps borrowers but hurts landlords and savers. One strategy utilized is to build in a fixed rate adjustment in addition to a CPI adjustment because the challenge for landlords is that the CPI since 2000 has averaged 2.1% and 1.7% since 2010. The current CPI doesn’t keep up with 3% average annual medical care increases.

One strategy that benefits landlords is to include lease language stating the rent adjusts based on the CPI or a fixed rate, whichever is higher. The 30 year table below shows how, during an extended period of low inflation, this strategy can dramatically increase the market value. This lease would include language with adjustments based on the CPI, which we assume in this scenario will continue at the average 1.3% annual rate, compared to a fixed rate of 3%. The result, assuming current rent income of $100,000, would be to increase rent by $95,399 in year 30, which at an 8% cap rate adds $1,192,486 more market value to the property.


In conclusion, make sure your lease language details how your rent is adjusted. You can design your table data at the Bureau of Labor website and, if you need help, their phone number is shown on the data release. If you call the number on the press release, the analyst who produced the CPI report will answer any questions. If your property is in outlier data cities such as Detroit, Houston or New Orleans, you can even produce a local Consumer Price Index. Remember to make sure your lease is clear about what CPI is used, how it is calculated and whether you compound your rate, which is why many tenants and landlords hire an expert to advise them. Remember, lease mistakes can be costly.

Read our original article published in a national publication, SIOR Magazine: The Three Most Common Mistakes In Your Lease.