Monument for the establishment of a sister-park relationship between Schabarum Regional Park in Rowland Heights, California, U.S.A. and Kairaku-en in Mito, Ibaraki, Japan, dated February 7, 1992. In 1992, Kairaku-en donated 500 ume ("Prunus mume") trees to Schabarum Regional Park. The trees can be seen behind and near this monument.