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 | Directions John S. Preston My office of is located on Clarendon Cres in Oakland, California, just southeast of the intersection of Portal Avenue and Mandana Boulevard. For a map to my office, please click here. Copyright © 2005 by John S. Preston. All rights reserved. You may reproduce materials available at this site for your own personal use and for non-commercial distribution. All copies must include this copyright statement. |  |          |