According to INTACH, which has been fighting a losing legal battle for preservation of the buildings, work to tear down the buildings began late last night and by morning, the halls were reduced to rubble.
The halls, regarded as "modern architecture marvels", were built at Pragati Maidan here to celebrate 25 years of the country's independence.
"The Hall of Nations and the Hall of Industries have been demolished to make way for a state-of-the-art modern complex which would add immensely to the profile of the capital city.
The India Trade Promotion Organisation (ITPO), headquartered at Pragati Maidan, is the nodal agency under the aegis of the Ministry of Commerce and Industry for promoting the country's external trade and hosts the famous annual trade fair on its premises.
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"This is just shocking. It is not just a loss of architectural legacy but in a way the evolution of the history of the city as well.
Menon is the former convener of the Delhi Chapter of INTACH, which has been fighting to have a group of modern-era buildings in the city come under the purview of protection.
The Delhi High Court on April 20 had dismissed a plea by the building's architect to preserve it.
Justice Sanjeev Sachdeva dismissed as "without merit" the plea by architect Raj Rewal, who had designed the building.
It also said since the HCC's guidelines, formulated in February this year, have not been challenged, therefore the architect has no legal right to seek preservation of the structure.
"The Hall of Nations is a very significant building in the evolution of modern architecture in India. It demonstrated the ability of the profession in 1970 to build a large space frame structure with available resources, which in this case was reinforced cement concrete and skilled hand-labour.
Possibly, India's first pillarless structure, the Centre's move to demolish it was met with impassioned pleas from art houses and galleries globally, including the Museum of Modern Art (MoMA) in New York.
"MoMA and the Pompidou Centre in Paris, among other institutions, have exhibited the plans and photograph of the buildings," Menon said.
Well-known photographer Madan Mahatta had celebrated its creation in a black-and-white photo exhibition a few years back.
As per the Centre's plan, a state-of-the-art exhibition- cum-convention complex will come up in a few years.
"The layout plan is ready and it has been approved by the Competent Authority. We expect to finish it by mid-2019. A basement parking facility for 4,800 vehicles is also a part of the project," the ITPO official said.
"Red and white sandstones will be used in the construction in harmony with other buildings in the capital. It will add to the aesthetics of the city," he said
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