This led to the foundation of the Japan National Trust, modeled after the National Trust in Great Britain, and which has been successful in preserving the historical ambience of Kamakura and parts of other cities around Japan.
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Osaragi was deeply influenced by French literature and culture, and wrote a number non-fiction pieces displaying his deep understanding of controversial events in Europe: Dorefyus jiken ("The Dreyfus Affair"), Buranje Shogun no Higeki ("The Tragedy of General Boulanger"), and Pari Moyu ("Paris is Burning"; a history of Paris Commune).
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When housing developers threatened the mountainside behind Kamakura's famous Tsurugaoka Hachiman-gū, he banded together with a number of famous literati and artists (including Hideo Kobayashi, Nagai Tatsuo, Yasunari Kawabata, Riichi Yokomitsu, Itō Shinsui, Kiyokata Kaburagi), residing in Kamakura to oppose the development.