Van Prooijen Trading is a growable 4x4 skyscraper building in SimCity 4. It is the smallest of the 6 CO$$$ 4x4 buildings, offering only 4533 jobs. Van Prooijen Trading is classified as a stage 8 building. As with all other stage 8 commercial office buildings, it is required to have approximately 45,000 office jobs in the region before this building can grow.