Coco Republic sells furniture, homeware and design services.
John Papagiannis, Scentre's leasing and retail solutions director, said the store would enhance the new centre and Coco Republic was one of the most sought-after Australian furniture and design brands.
New Zealanders have been able to buy items from the chain online in the last few years.
ASX-listed Scentre reported A$1.28 billion ($1.3b) revenue in the six months to June 30, up 6.5 per cent from the same period in 2017. Net profit rose 3.6 per cent from A$1.41b to A$1.46b.
Westfield Newmarket (51 per cent Scentre and 49 per cent Singaporean interests) will have 230 specialty retailers when it opens in the fourth quarter of this year, between September 1 and December 31.
The total annual retail spend in the Westfield Newmarket trade area was estimated to be around $9.7b last year, Scentre said.
"At $99,447 per annum, the average household income in the main trade area in 2015 was 10 per cent above the Auckland region average of $90,799," Scentre said in a results presentation.