The City of Boulder, Colorado and the Boulder Sister City Alliance collaborated on the development of a Sister City Plaza in downtown Boulder. Located on the east lawn of the Municipal Building, the plaza is dedicated to honoring Boulder's Sister City relationships. Beginning more than twenty years, the community of Boulder has fostered seven Sister City relationships, including: Dushanbe, Tajikistan; Jalapa, Nicaragua; Kisumu, Kenya; Lhasa, Tibet; Mante, Mexico; Yamagata, Japan and Yateras, Cuba. These relationships have centered on health care, education, economics and a variety of other humanitarian services.
The Sister City Plaza features artistic, stone and metal inlay squares honoring each of Boulder's Sister Cities. The squares represent unique geographic and economic features exclusive to each region. The plaza design also includes seating areas, entry columns, lighting and low-water landscaping and an herb garden with plants common to those areas. In addition, a delegation from Yamagata, Japan came to Boulder in April of 2007 and gifted 50 cherry trees to the City, several of which are planted in the plaza area. Boulder's former Mayor Mark Ruzzin declared May 13 - 19, 2007 as Boulder Sister City Week.