What is "dojunkai"

Dōjunkai ( shinjitai: , kyūjitai: ) was a corporation set up a year after the 1923 Kantō earthquake to provide reinforced concrete (and thus earthquake- and fire-resistant) collective housing in the Tokyo area. Its formal name was Zaidan-hōjin Dōjunkai , i.e. the Dōjunkai corporation. The suffix kai means organization, and dōjun was a term coined to suggest the spread of the nutritious benefit of the water of river and sea. It was overseen by the Home Ministry.

The corporation was in existence from 1924 through 1941; it was involved in construction between 1926 and 1934, primarily 1926–30, building 16 complexes. The last complex, Uenoshita apartment, was finally demolished in 2013.