In a LEED CS 2009 building energy simulation: we are modeling the building envelope to test performance (only the building envelope). It is a 10-story building with 2 glass façades with high-performance glass system and well-insulated opaque façades. The first 2 stories will be owner-occupied and the rest will be rented. But the model so far is failing, because the slabs (levels 4-10) are being modeled as they will be left by the developer (concrete slabs), without considering that in the future the tenants will build their fit-out, including false ceilings, flooring systems, etc., which will add insulation value to the slabs and make them acceptable. As the fit-out is not part of the developer’s scope of work but will be built by the tenants, is this acceptable in the energy simulation model with the appropriate narratives:

“In Core & Shell buildings, not all the components addressed by ASHRAE 90.1-2007 may be designed or defined. For these types of projects, show compliance for the scope of work that is controlled by the core and shell project team. For example, if there is no lighting scope of work in the Core & Shell, the team need not demonstrate compliance with the lighting standard but must show compliance with other provisions.” (LEED GBDC Reference Guide, EApr2 pg. 246)