Passage: The Elamite name of this structure is Ziggurat Dūr Untash, (/ˈzɪɡəræt/ ZIG-ər-at; from the Semitic Akkadian word ziqqurat, based on the D-stem of zaqāru "to build on a raised area") and Dur Untash is the combination of Elamite Dur (Place/resident/city)  and Untash the Elamite king who built it. However this structure is known by its new Persian  name today "Chogha Zanbil" that has given to it Choga Zanbil means basket mound. It was built about 1250 BC by the king Untash-Napirisha, mainly to honor the great god Inshushinak. Its original name was Dur Untash, which means 'town of Untash', but it is unlikely that many people, besides priests and servants, ever lived there. The complex is protected by three concentric walls which define the main areas of the 'town'. The inner area is wholly taken up with a great ziggurat dedicated to the main god, which was built over an earlier square temple with storage rooms also built by Untash-Napirisha.

Question: Who built the building?
Untash-Napirisha