PORTLAND, ORE. — Portland-based Guardian Management LLC, through a newly formed corporation, will acquire the Southern California and Arizona offices of Sperry Van Ness. With the acquisition, Guardian will hold the development and franchise rights for Sperry Van Ness in Southern California, Arizona and Oregon; and the company’s president, Tom Brenneke, will become a member of the Sperry Van Ness board of advisors. The transaction is slated to close no later than August 29. The purchase includes seven regional offices in Southern California and one office in Phoenix, totaling 190 commercial real estate advisors. Guardian is planning to expand Sperry Van Ness’ presence in Oregon and Arizona.