The specific inflation index utilized for variable escalations.
Also known as: Inflation Index, Cost of Living
By Angel Campa, Founder · Updated March 2026
Different CPI indices produce different escalation amounts. The national CPI-U may show 3.2% inflation while a regional CPI shows 4.1%. Over a 10-year lease, using the wrong index to verify rent increases can lead to cumulative overpayment or underpayment of thousands of dollars. The specific index reference also determines which government publication must be consulted for verification.
Specified in the "Rent Adjustments" or "CPI Escalation" section. Look for the full index name (e.g., "CPI-U for All Urban Consumers, U.S. City Average"), the base period, and the comparison methodology.
Lextract uses a combination of AWS Textract OCR and Claude AI to identify and extract the cpi index used from your lease PDF. The AI searches for the field name and common aliases like "Inflation Index", "Cost of Living" across all pages of the document, then assigns a confidence score based on OCR quality and extraction certainty. Fields with lower confidence are flagged for human review.
Annual Base Rent
The total base rent payable for the first full lease year.
Payment Frequency
The interval at which rent is due.
Escalation Type
The methodology used to increase rent over the term.
Fixed Escalation %
The static percentage by which rent increases annually, if applicable.
Percentage Rent Rate
The percentage of gross sales payable to the landlord.
Breakpoint Amount
The gross sales threshold that triggers percentage rent obligations.
The CPI-U (Consumer Price Index for All Urban Consumers) published by the U.S. Bureau of Labor Statistics is the most commonly referenced index. Some leases specify a regional variant (e.g., CPI-U for the Los Angeles metropolitan area) for local relevance.
Most well-drafted leases include a fallback provision designating a successor index or a calculation methodology if the original index is discontinued. Without this language, the parties may need to negotiate or litigate a replacement.
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