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Postal Explorer > Publication 28 - Postal Addressing Standards > Appendix C Street Abbreviations > C2 Secondary Unit Designators

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C2 Secondary Unit Designators

Description Approved Abbreviation
Apartment APT
Basement BSMT**
Blank, unable to determine* blank
Building BLDG
Department DEPT
Floor FL
Front FRNT**
Hanger HNGR
Key KEY
Lobby LBBY**
Lot LOT
Lower LOWR**
Office OFC**
Penthouse PH**
Pier PIER
Rear REAR**
Room RM
Side SIDE**
Slip SLIP
Space SPC
Stop STOP
Suite STE
Trailer TRLR
Unit UNIT
Upper UPPR**

* Requires the pound sign (#) to be used on the mailpiece.

** Does not require a Secondary RANGE to follow.

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