CS project: How do I know the regularly occupied spaces?

Susan, No you do not need to work with the tenants with their layout to determine whether it will meet the 75% for 8.1. All that is needed is the areas that could be regularly occupied. Core areas such as elevator lobbies, mechanical spaces do not need to be included. I would say that it is good practice to involve your tenants so that they can maximize the daylight. Even tenant guidelines could be used.They may not know what was done to provide daylight in the space and could hurt the effort by placing enclosed offices at the window wall and open office in the interior. If attempting 8.2, you will need to provide possible tenant layout and count. In that case i would use it for 8.1 also for consistency.

Hi Todd and Suzan, From what I understand, Tenanted areas should not be included in the daylight simulation. Indeed, the guidance states on p 554 that daylighting in tenanted areas is a LEED for Commercial Interior credit and is therefore not considered in LEED CS. Do you agree ?

George, Are you attempting CS? You have a mall, is it already occupied with tenants? Or is it just the shell? Is it occupied? The space which will be tenant fit out areas would have to be included. Without digging through CIRs (which the new library for CIRs is terrible) I don;t know of why this space would be excluded. Some projects just cannot earn some credits. When you start looking to attempt LEED and even daylight after schematic design. then it is search for compliance and not actually designing and building for compliance and performance.

George, I did 4 LEED CS projects within the last year. Here is how we did it and what the reviewers advised us on. You have to establish a "potential tenant design". This is not necessary, what the tenants actually build. This design has to be consistent throughout the credits/prerequisites. So while developing the tenant design keep in mind that you will also have to consider views IEQ 8.2, comfort controlls IEQ 6, etc.. You than determine the regular occupied areas based on the same definition as for LEED NC. Also you have to include the tenant space into your calculations. You can make assumptions like having offices along the windows and a hallway in the middle, while all walls (Office-hallway) are made of glass. So basically you will show that the building allows for 75% daylight area based on the core & shell and a possible tenant layout.

Susan, Is it necessary that the submitted drawings of fit-outs will actually match the assumed the most probable actual layout? We have 7 floor office building. In current design layouts there are 6 floors of small separated offices and 1 floor of open offices. I suppose these drawings that I received do not match the most probable tenant layout. The common real proportion in other buildings developed by the investor is at about 4/3 = open/divided offices which is different from the actual drawings 1/6. The assumption of 4/3 will be used in EAp2 energy modelling to demonstrate DCV and other energy efficiency measures. Do we have to tell the architect and the MEPs to change their current drawings to open spaces in order to reach the 4/3 proportion and to submit such drawings then coherently for all the credits? Thanks!