Bellevue’s O’Brien Auto Group, the largest auto dealer in the Pacific Northwest, today announced that it has purchased Bob Bridge Toyota Scion of Renton.

While financials details were not made public, O’Brien confirmed that the deal formally closed this week and that the company has already begun operating as Toyota Scion of Renton. The company also announced that it expects to retain all existing employees while adding more jobs in 2012.

Founded in 1986, O’Brien Auto Group is a privately-held company that owns and operates 14 dealerships in Washington and Oregon. The company employs more than 600 people and had annual sales exceeding $500 million in 2011.