Option 1, Path 3. Streamlined DES Modeling

to better explain the question, how should the energy rate be calculated for this path?  the LEED v4 reference guide says that" Use the streamlined DES modeling in the calculator provided by USGBC to allocate the energy costs to the results of the model for each district energy source, in lieu of the purchased energy rates, to determine the baseline and proposed case energy costs." which is unclear to me! -- does it mean the Minimum Energy Performance Calculator by "the calculator provided by USGBC"? -- if we decide to use Monitoring approach  to calculate the average efficiencies for the proposed model, do we still need to model the upstream equipment in the proposed energy model? -- the baseline model should have an on-site appendix G equipment or with a virtual DES boiler plant?