This notice is posted for a long period to invite additional suppliers to submit arrangements to become pre-qualified Suppliers and assigned an Supply Arrangement for the provision of services.Natural Resources Canada is seeking proposals from bidders to obtain professional services for existing building commissioning (EBCx) of federal facilities, as part of the Greening Government Strategy and the Federal Sustainable Development Strategy.Bidders can demonstrate their preference for one (1) to six (6) regions.Mandates may be associated with single or multiple buildings and involve one or more of the following activities:Initial EBCx pre-screening – analysis of a portfolio to help target and prioritize candidate buildings, as well as to select the most appropriate EBCx and GHG emission reduction approach for identified buildings.Recommissioning (RCx) mandate – services to optimize the performance of existing buildings, seeking to improve how building equipment and systems are operating to meet current facility requirements.Ongoing Commissioning (OCx) – services for implementing and supporting persistence strategies to maintain and further improve the performance of the building’s equipment and systems, as well as to ensure the sustainability of acquired knowledge in the medium term.There are security requirements associated with this requirement.NRCan intends to issue Supply Arrangements to those whose offers meet all Requirements and Conditions Precedent to the Issuance of the Supply Arrangements.