Area cultural institution designed for the participants of the courses (specialized workshops, studios, rooms for classes thematic) or readers (reading rooms, rental books), spaces for personnel, exhibition halls, the space used for storing, occupied by machinery and equipment.

For the usable area shall not include: porches, lobbies, driveways, reception desks, recreation rooms for staff, a cafe, elevators, stairwells, locker rooms, corridors, sanitary facilities, premises occupied by the equipment for ventilation, heating and cooling.