 LOS ANGELES TORONTO--BUSINESS WIRE--Hudson Pacific Properties, Inc. Hudson Pacific NYSE: HPP and Canada Pension Plan Investment Board CPP Investments today announced they have signed an agreement to purchase through a joint venture a 668,000-square-foot trophy office tower in Seattle for US625 million before closing adjustments. CPP Investments will own a 45 interest in the joint venture and Hudson Pacific will own 55 and act as general partner and as property, leasing and co 