benchmarking data for CRE companies

[Hyun Son]

How do commercial real estate companies (JLL and CBRE, etc) find and use their benchmark data to share to their clients while doing pitches or data sharing during projects? Is there some kind of specific software or sources that they use to figure out things like cost per square foot, usable square foot/person, assessing the current state of the market or assessing their competitors?? Would like answers focused on NY market if possible! Thanks guys!