the diet building was built between 1920 and 1936 with a floor plan based on fukuzo's entry. the roof and tower of the building might have been inspired by another entrant, third prize winner takeuchi shinshichi, and are believed to have been chosen because they mixed european and east asian architecture. the actual source for the "pyramid" roof remains unclear, but japanese historian jonathan reynolds suggests it might have come from from shinshichi. historian of africa studies zoe strother says shinshichi's design resembles the mausoleum at halicarnassus, which was a model for some prominent western designs in the early 1900s, such as john russell pope's 1911 award-winning house of the temple in washington, d.c. and the downtown los angeles city hall, completed in 1928.