Kathmandu's new building will pump goods into 41 stores throughout New Zealand and the business expects it to meet the demands of future growth.
The retailer took a long-term lease on the building, which was handed over to Kathmandu on Thursday last week.
Senior executives of Arrow and Kathmandu, Mortimer and Christchurch Central Development Unit director Warwick Isaacs attended.
Mortimer said the new building was a sign of hope.
"Canterbury needs this type of development offering long-term investment, in particular post-earthquake, and we are delighted that the Kathmandu board has selected our eastern Christchurch location for their state-of-the-art warehousing facility," he said.
"We are confident in the future of Portlink, given the growth of the thriving Port Hills industrial area in the past decade.
"This has drastically changed the area's landscape with mixed industrial and third party logistics operators moving as close as possible to the port, which is itself undergoing development," he said.
"An additional and significant factor is that the land at Portlink, plus the immediate surrounding industrial area, has been largely unaffected by any seismic activity so we are already seeing other developments proposed for this eastern location," Mortimer said.