Associate Chief Justice Austin Cullen has moved the Sept. 16 trial citing "the efficiency of the trial and the ability to control its process."
Jamie Bacon, one of three brothers who police have linked to Vancouver's gang war and who was also charged in the case, will be tried separately, although no date has yet been set.
The killings, known as the "Surrey Six" murders, occurred Oct. 19, 2007 and police have previously said four of the victims were targeted.
But 22-year-old Chris Mohan, a resident of the tower, and 55-year-old Ed Schellenberg, a maintenance worker, were in the wrong place at the wrong time.
Dennis Karbovanec pleaded guilty in April 2009 to three counts of second-degree murder and conspiracy to commit first-degree murder in the slayings.
Standing trial next month will be Cody Rae Haevischer, Mathew Johnston and Quang Vinh Thang Le.
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