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The De La Warr Pavilion was built in 1935. The distinctive Art Deco style building with its clean lines and large glass terraced frontage overlooking the sea front is claimed by some to be the first modernist public building in Britain.
Inside a dramatic sweeping spiral staircase, lighting and round air-duct details hint at a streamlined art deco influence. The building was awarded Grade I listed building status in 1986.…read more on wikipedia Link

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link