Construction work is underway at the Quays Shopping Centre in Newry.
It's estimated that Phase 5 of the extension will cost in the region of twenty million pounds.
The building will be detached from the main complex with a bridge linking the two.
There will be six shops and three restaurants.
Construction will also include a multi-storey car park with 600 spaces, and new access for drivers via Drumalane Road.
The works are creating hundreds of new construction and retail jobs.
Man in 90s dies following Co Down road crash
Police to increase patrols after second incident of shots being fired in Belfast
Woman charged over theft of campaigner’s car ‘must stay out of Belfast’
Bluetongue restrictions in Northern Ireland will be relaxed from Friday
Conviction led to safeguarding review at Presbyterian Church