We designed a three story office building - the main level is the general building lobby. There is a floor below and one above. The main level floor is a multi-tenant floor plate. The upper and lower levels have full floor users. Both of these full floor users have security access, and the toilet cores are within their suite and only those tenants have access to the toilets on their floor. The toilets on the main floor are available to all building users.
BOMA Standards state that toilets are never part of the usable area, and I would concur when the toilet cores are accessible by all tenants. In this case, if these two cores are not available to all building users it seems unfair that if I am one of the multi-tenants on this floor, I am paying my prorata share of those toilets, as well as the main level because they are a factor in the building rentable area.
Is there any scenario where they are considered usable area if the floor user, and only that floor user has access to them?