 An expected, around 16,500 metric tonnes of steel is used in construction, which is more than the volume of steel used in raising Eiffel Tower and Indira Gandhi International Airport, New Delhi.The capacity of the main auditorium is around 5000.The Samrat Ashoka Convention centre has three major signature buildings- 1) Bapu Sabahagaar, an auditorium of 5000 seating capacity, 2) Gyan Bhawan with 800 capacity auditorium (lecture theater type), multipurpose hall and other conference halls of various capacities ; and 3) Sabhyata Dwar (Civilization Gate).