The SPCREX will be calculated monthly, using a three-month moving average. Commercial real estate sales transactions are aggregated into rolling three-month periods for the calculation of constant quality mean prices per square foot. Commercial stock weights are subsequently applied to calculate each index. In each reporting period, the index is based on three months of closed transactions, and the typical lag from transaction close to data reporting is three months.
The Chicago Mercantile Exchange has announced it will trade futures and options on futures on the indexes in the next 3–9 months. Its earlier plans to use GRA property indexes were suspended after the company was taken over by brokerage Charles Schwab in January this year.