Partial Purchased Energy

Good afternoon. I'm getting started on a model for a county courthouse office expansion. In its pre-renovated state, the facility purchases both HW and CW through the local utility. The proposed system is to use VRF + DOAS. For the DOAS unit, the design engineer is proposing to use a HW coil that is directly linked to the utility's HW feed through a plate HX. On the cooling side, they want to use a DX-based system with a water-cooled condenser. This water cooled condenser would be linked to the utility's CW feed through a plate HX. The DX+CW system configuration has been proposed to allow the equipment to utilize a hot gas reheat for dehumidification purposes. Long story short, I'm trying to figure out how my baseline system should be modeled so that USGBC finds it acceptable. ASHRAE 90.1 Appendix G, if I weren't dealing with DES, indicates that I would be using a System 7-VAV with Reheat because I am greater than 5 stories. The "Treatment of District or Campus Thermal Energy in LEED V2 and LEED 2009 - Design and Construction; v2.0" manual, Table 3 indicates no applicable changes to the Appendix G requirements. However, this manual states, when pursuing Option #1 for the Performance Path, in Section 2.4.1.1 (1) that the "energy source is modeled as purchased energy in both the Proposed and Baseline buildings for all air handlers [...] serviced by district or campus energy systems in order to hold the DES cost-neutral in the model." My issue is that all my loads other than those associated with ventilation air handled by an electrically-driven air-source heat pump system and only my ventilation loads use the DES. Any thoughts on how this should be modeled while still meeting LEED's baseline modeling requirements for System-7 VAV with Reheat?