The LEED-EBOM 2009 rating system offers a 10% floor area exemption option for multitenant buildings. In instances where tenant data cannot be gathered, or the EBOM applicant does not have control over tenant operational practices, the project team may exclude up to 10% of the building’s gross floor area for any prerequisite or credit. See page xxii of the Reference Guide for further information.

For MRc1 specifically, non-participating tenants in excess of the 10% exemption must be included in the credit calculations. Project teams should assume that any tenant that does not provide data is 0% compliant with sustainable purchasing criteria. The total purchasing level of non-participating tenants must be estimated using the data collected from participating tenants. Estimated data can be extrapolated on a per-square-foot or per-occupant basis, or by using another appropriate calculation. The estimated purchasing level should then be aggregated into the data collected for the rest of the building to generate building-wide purchasing values. See the LEEDuser Documentation Toolkit and pages 264–265 of the LEED Reference Guide for additional calculations guidance.