A scene investigation has been completed in West Auckland.
The deceased is thought to be a Chinese man aged in his early 30s.
His death is being treated as suspicious.
The 57-year-old was one of multiple victims.
Raurangi Marino raped a five-year-old girl with "significant violence" in 2011.
"We are aware that vulnerable people continue to be exploited even during such extraordinary times."
Police say those arrested include known gang members or associates.
Investigators are going door to door in the area seeking more information.
Police were called to the address just after midnight.