From Leeduser.com, CS-2009/IEQc1, Credit Requirements, Potential Technologies & Strategies:
"Installation of CO2 sensors in tenant spaces is not required during core and shell construction, and tenants are not required to install CO2 monitors; however, they should be made aware of the capability of the core and shell system to monitor CO2. The core and shell systems must be designed with the capacity for CO2 monitoring. This entails a building automation system that can be expanded to include future tenant CO2 points."

From LEED ONLINE:
"For all spaces where the scope of anticipated tenant work will include outdoor air delivery monitoring elements addressed in IEQ Credit 1, the tenant sales and/or lease agreement contains binding language specifying the minimum criteria for ventilation monitoring systems and monitoring
of mechanically and naturally ventilated spaces such that spaces within the scope of anticipated tenant work shall comply with the requirements of IEQ Credit1 when completed."

LEEDuser.com's text on tenant scope of work on outdoor air delivery monitoring seems misleading, please check and update it if necessary.

Thanks!