Lucernex expert Jim Duport (see Jim’s management summary here) provides this response:
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In essence, GAAP (Generally Accepted Accounting Principals) rent is an averaging of the rent over the term taking into account rent abatement and fixed/known rent increases. The rent cost calculated based on GAAP is then charged/booked to the Income Statement / Profit & Loss (P&L) statement. The P&L statement is what is reported to the Securities and Exchange Commission (SEC) and is used for tax purposes. In many corporations, the GAAP rent is also the cost that is charged to the real estate department’s or end-user’s budget.
CPI & GAAP — a CPI GAAP analysis
What happens if there is free rent and rent increases are based on the Consumer Price Index (CPI), a “CPI GAAP analysis”? Since increases are not a “known” value, it is difficult to apply GAAP to a lease with CPI increases.