Detective Inspector Lloyd Schmid, of the Financial Crime Group, said it was well recognised that the vast majority of assets police restrained related to drugs, gangs and organised crime.
In the 2017/18 financial year around $93,000 of assets were restrained by police in Northland, rising to almost $2.5 million last financial year. The current year's figure was already around $1.5m.
"This expansion of a dedicated office means those indulging in the proceeds of crime in Northland should expect to come to increased police attention," Schmid said.
"Targeting the money made by organised crime is key to impacting their operations, and therefore reducing their influence in the community."
Money accrued from forfeited assets was invested back into the communities it was taken from, by means including support for community safety and wellbeing, and drug addiction services.
The public also had an important role to play.
"The more we know about criminal activity, the better placed we are to act," he said.
"We encourage any members of the public who suspect that someone has obtained assets through criminal offending to contact the police or Crimestoppers, anonymously, on 0800 555 111."