Location of Diablo Valley Masonic Center 4035 Treat Blvd, Concord, California The following map shows the approximate location of the Chapter. 1. Exit onto Clayton Road from Hiway 242. Turn right onto Treat off of Clayton Road. - or - 2. Exit onto Treat Blvd from Hiway 680. - or - 3. Exit onto Monument Blvd from 680. Turn right onto Cowell Road then Right onto Treat.   For further information regarding this page please email the Webmaster of this site. Page updated 11/29/05