I have read Interpretation #10134 and 10135, but based on some of the comments below, I would like some additional confirmation. Does new system-level mechanical equipment that serves 60% of the space need to be installed (to pursue item 1 or 2 in #10134), or can this apply to existing systems serving new zone-level equipment (i.e. VAV reheat boxes)? Otherwise item 3 will have to be pursued, meaning that existing equipment will have to meet all relevant criteria.