The building was designed by Norwegian architect Rolf Christian Krognes and first constructed in 1975. It has 26 floors and at 111 meter in height, is the second tallest building in Oslo. In 2003, the building went through a rehabilitation in which seven floors were added and the building was split in two towers. After the rehabilitation, Aftenposten newspaper moved into the building.
Postgirobygget is the property of the Norwegian State-owned real estate company, Entra Eiendom AS. The building serves, among other things, as the home office for the Norwegian postal service, Posten Norge. 
- "Postgirobygget: Operasjon skyskraper". oyvindholen.wordpress. September 11, 2014. Retrieved October 1, 2016.
- "Biskop Gunnerus' gate 14". entra.no/properties. Retrieved October 1, 2016.
- "Postgirobygget (Oslo Center)". facaderetrofit.org. Retrieved October 1, 2016.
- "Entra Eiendom AS". Store norske leksikon. Retrieved October 1, 2016.
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