Hello Everyone,

I am preparing a project, which is going to be a newly constructed addition (horizontally) to an existing building. The existing building's function is warehouse/retail/offices and the new wing should be a warehouse with some office spaces. In this case the owner is the same and they will build-to-suit. The new addition is going to have own separate HVAC systems, etc.

In this situation, I have two options for the owner,

1) LEED BD+C NC Warehouses -> just for the addition which is separated from the non-certified building

2) LEED O+M -> for both the existing and the new addition, after it has been built (if they want to get a certification for the whole building)

My questions would be,

a) Are my options the right methods for the situation?

b) Can we do the NC for the addition, then O+M for the whole project?

c) Could you advise some guidance from USGBC documentation?

Thanks for your help!