For one of our retail projects, we are working with our client to define the GLA for future tenant spaces.I am having trouble understanding the right way to measure certain stairs and elevators. We have several tenants that occupy a two story space. Within each space, there is a stair that is exclusively for the tenants use. Would the floor area below the stair as well as the void on the second level be counted towards the GLA total? Or would you exclude the void from the GLA calculation and only count the area where the stair originates? Also, what is the case for the same scenario but with an elevator?

Am I to understand that BOMA excludes the 2nd level opening area? Another example is that for one tenant we currently have no stair opening but have provided for it structurally and believe they will be laying out a stair based upon their preliminary plan. Once they give us the opening dimension does the lease GLA then go down by the 2nd level opening square footage?

Thank you in advance for your help!