9291 Old Redwood Hwy., Bldg. 400
P.O. Box 100
Windsor, CA 95492-100

• Use address blocks, like envelopes
• Abbreviate all street determiners
• Hwy., Rd., St., Blvd., etc.
• Use building or suite numbers
• Bldg. 400 or Ste. 105
• Punctuate post office box abbreviation
• P.O. Box 100
• Use mailing address zip code when mailing address is used