The growth of online retail outlets doesn't seem to be deterring investors from putting money into brick and mortar stores.

Concept plans have emerged for a mega-mall at Takapuna on Auckland's North Shore.

The building will be topped with 360 apartments, in two glass towers standing 18 and 30 stories high.

The site would have a total of 9.6 hectares of floor space, equivalent to about 12 rugby fields - although much of that would be apartments.

It's part of a billion-dollar splurge of activity across Auckland, with retail centres being bought, sold, and expanded.

As well as the North Shore and west Auckland developments, Tiffany and Chanel are coming to Britomart in central Auckland and Precinct Properties will soon knock down and upsize the CBD's Downtown mall.