An £85 million plan to transform Eastbourne Arndale Centre was approved in 2014.
The extension will provide twenty-two new shops, seven new restaurants and a nine-screen multiplex cinema between the existing Arndale Centre and the railway station.
The development is a private sector proposal from a company called Performance Retail Limited Partnership (PRLP) in which Legal & General have a majority share.
Demolition of the Terminus Road properties is underway. The erection of the steel frame for the extension is planned to be erected between August and December and the development will be open to the public by November 2018.
Watch the development happen live on the Eastbourne Arndale Centre website.