Cx requirements for small office remodel

I am working on a project that is a relatively small office remodel seeking LEED certification. My company is the tenant, but we are a general contractor, so we are also essentially the design team and the project owner (not buildin owner). The majority of the remodel is moving a few interior partition walls and changing the use of some spaces. The only HVAC scope is adding an economizer for our conference room spaces and lighting will almost all be reused with some added daylight/timer controls. Based on the size of the project and scope, we would only be commissioning the new economizer and the lighting controls system, correct? Also, where do lines get drawn between responsibilities when one entity fills the roles of Owner, Design team, and Contractor?