As a rule the boundary for sustainability reporting is the one used for the financial statements. Where judgement is called for, the department draws the boundary following the GHG Protocol, which offers two approaches, equity share (by economic interest) and control (all emissions from operations under financial or operational control); matching the financial boundary exactly may take a mix of the two, above all for joint ventures, associates and leases. Whichever allocation is chosen should be used consistently across the departmental group and explained to readers, which rules out the shortcuts and variations (multiple occupancy sites, for example) that the commitments framework tolerates. Appendix A has more on boundaries.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.