Arriva Towers - Calgary - was created in 2007.
Arriva was created in 1938.
Arriva Derby was created in 1997.
Arriva Southend was created in 1998.
Arriva Midlands was created in 1997.
Arriva Yorkshire was created in 1997.
Arriva UK Trains was created in 2011.
Arriva Trains Northern was created in 2001.
Arriva RP was created on 2007-10-12.
Arriva North West was created in 2009.
Arriva Scotland West was created in 1997.
Arriva Buses Wales was created in 2009.
Calgary is a proper noun. Towers, facilities, and business are nouns. Downtown and office are noun adjuncts: nouns functioning as adjectives.