New Delhi, Dec 13 (ANI): Prime Minister Narendra Modi attended the inauguration of ceremonial hall at President Estate in New Delhi. Speaking on the occasion, the Prime Minister said President Estate (Rashtrapati Bhavan) has become a symbol of India's pride across the world. He added that President Pranab Mukherjee has made a unique contribution in re-energising the Rashtrapati Bhavan complex. Modi also mentioned that the existing institutions have to be revitalised from time to time, and President's contribution in this regard is an inspiration for all countrymen, in the quest for building a modern India. The Prime Minister also expressed happiness that on December 11, which happens to be President's birthday, the United Nations accepted India's proposal on International Yoga Day.