ID#10240 made on
EAc1 - Optimize energy performance
LEED BD+C: Core and Shell
The project is a retail shopping center. The developer proposes to seek Core & Shell (CS) LEED certification, and to encourage, but not require, tenants to seek Commercial Interiors (CI) certific...
The project is a retail shopping center. The developer proposes to seek Core & Shell (CS) LEED certification, and to encourage, but not require, tenants to seek Commercial Interiors (CI) certification. The interpretations requested apply to EA Credit 1, Option 1, Whole Building Energy Simulation, also referred to as Building Energy Modeling (BEM). We propose to use the Performance Rating Method for all energy consuming systems served by the Landlords meter, including the building envelope enclosing those spaces. There are no Landlord controlled energy consuming systems in the parts of the building enclosing tenant space. We propose for the building envelope enclosing tenant space to conform to ASHRAE 90.1 2007. This will be done by the prescriptive method if possible; otherwise we will use the Energy Cost Budget Method to prove equivalence. For this project, the core and each tenant space is separately metered by utility company meters. The developer will control only the core space and the building envelope. The building envelope will conform to ASRAE 90.1 2007, but will not be relied upon for major energy cost saving by the developer or by tenants. If the CS BEM includes all energy consuming systems served by the Landlord's meter; and excludes all energy consuming systems served by the tenant meters, the energy conserving measures applied by the Landlord will earn the maximum available EA 1 credits, and the project will be eligible for CS certification. If the CS BEM also includes tenant energy consuming systems, with no tenant energy cost reduction measures, the Landlord cannot apply enough reasonable energy cost reduction measures to qualify for the EA prerequisite, and cannot qualify for CS certification. The basic question is, can the Landlord qualify for CS LEED certification based only on work under his direct control, or must he mandate tenant energy cost reduction measures, as required to reduce total building energy cost by the prescribed level? A secondary question is how to apply the floor area limits of various requirements to the building. The building functions as a series of small spaces, not as a total building. Should the area of each space be used, or the total building area?
The project is inquiring as to how to achieve credit for a prescriptive method under EAc1 for a Core and Shell Building in which the owner/developer will not require tenants to pursue increased performance measures. For Option 2, page 264 of the LEED Reference Guide for Green Building Design and Construction 2009 Edition (Updated June 2010) states "To apply for credit under this option, a Core and Shell Project must comply with all requirements for the ASHRAE Advanced Energy Design Guidelines, including those that may be in the tenant's scope of work. A sales agreement or tenant leases may be necessary." As a result, it does not appear the owner will have sufficient control over the future tenant installations to pursue Option 2. Also, for Option 3, it does not appear the project would comply with the credit requirements. Section 2 includes both lighting and mechanical system efficiency requirements which appear to be outside of the scope of owner control. If Option 3 is pursued, both Section 1 and Section 2 would need to be complied with to achieve credit. Please note, that there is a path available for credit under EAc1, Option 1 for Core and Shell buildings where the owner does not have control over the future tenant spaces. For these situations, owner/developer controlled spaces should be modeled in the proposed case as designed. For spaces/systems not controlled by the owner/developer, the proposed case should be modeled identically to the baseline case. A spreadsheet tool is available (here) which prorates the point threshold based on the owner/ developer controlled percentages. If the prescriptive options are pursued, documentation such as tenant requirements and a tenant lease agreement must be provided to verify the future tenants will meet the prescriptive requirements. The project also is inquiring as to how the floor area limits are applied to the various requirements to the building. The total building area within the scope of the LEED project submittal should be used to determine the building requirements. Applicable Internationally.
Related Addenda (Corrections & Interpretations)