Mixed Use Building - What is Required for Fixtures?

Yes, combine the residential plumbing calculations with the plumbing calculations for the core bathroom fixtures. Any tenant fit-out fixtures will be covered by LEED CI.

Karen, do you know if the owner needs to require tenants through the lease agreement to install fixtures that will satisfy WEp1? What if the project anticipates 3 points for WEc3 due to achieving 35% reduction for fixtures in the residential areas, should the lease agreement require the same reduction in tenant spaces to get the 3 points or is it sufficient to require tenants to meet the prerequisite?

Hi Joel, We have certified many primarily residential buildings with small unbuilt out commercial space. Since we are certifying the whole building as new construction, we are required to provide a tenant guideline document that dictates all the requirements for the future tenant. The whole building ultimately needs to comply. So yes, whatever credits you are pursuing like WEcr3, will need to be followed by your future tenant per the guidelines you provide about necessary flow rates, whether or not they actually decide to pursue LEED-CI or not for their space.

Thanks Michelle. Our building's commercial space is 20% of the project. So if I calculate the residential space achieves 38% reduction for WEc3, should our lease agreement require each tenant in the commercial space meet 35% for the fixtures in their scope if we want to get 3 points? Or should we calculate what % reduction is needed in each space so that the total building water reduction, in aggregate if the tenants comply, will be above 35%? We know the architect for one of the TI's and may get fixture information for one of the commercial spaces prior to submitting our documentation. If we do, should that space be added as if in our project scope?

We typically calculate the residential space and include the commercial space with core & shell default values from the Appendix in the reference manual for FTEs and visitors. Once the fixtures are identified to achieve the point threshold we're after, we put those fixtures in the tenant guideline. So in your case, each tenant will need to meet the 35% threshold. And no, I would not advocate trying to add tenant space scope to your project, unless you plan to wait for its completion and include it in every way. It will affect lots of things. Please note guidelines will apply to all the prereqs and credits including ventilation, energy, indoor air quality, etc.