I was asked to create a LEED CS Scorecard for a project that is an addition of a floor added to the top of an existing multi-story LEED O&M certified building. I do not think CS is appropriate, as the owner will occupy the whole space.  I am unsure if under O&M the client even needs to separately certify the space. All of the O&M credits have used the word "renovation", but I have not seen the word "addition".  I felt that BD&C would be the most appropriate for this, if we had to certify it outside of the O&M, as it is an entire new space, including envelope.  Thoughts?