The building depth refers to the second dimension of the building ground plan (which will be displayed vertically on the screen). It must be in units compatible with the department areas. The building area is computed as the product of the building width and building depth. The building and department areas should be expressed in compatible units to the building width and depth, i.e., if the building depth and width are expressed in feet then the building and department areas must be expressed in square feet.
The building depth of a project is set when the project is created with the New command or when the project is read from an external ASCII file with the Import command of the File menu. The building depth can be modified at any time by the Building Dimensions command of the Edit menu.