In the capital at the time, Tokyo, many daimyo-residences and attached gardens were destroyed one after another, and Keijiro OZAWA seeing this, collected records and data of these old gardens in his spare time outside his duties, and after his retirement, he researched these teiens and published Meiji Teien-ki (A Record of Gardens during the Meiji period) in 1915.
当時の首都東京では江戸時代の大名屋敷とそれに付随する庭園が次々と壊され、この現状を目の前にして小沢圭次郎は職務の余暇として古い庭園の記録と資料収集を行っており、退職してからはさらに庭園研究に励み、1915(大正4)年『明治庭園記』を発表するに至る。