walnut street historic district is a historic district in chaska, minnesota, united states, listed on the national register of historic places. the district is roughly bounded by walnut, second, chestnut, and sixth streets. it contains burial mounds representing the area's prehistory, and the buildings and structures in the district represent chaska's period of commercial, industrial, religious, and residential development. houses within this district include the greek revival style and other neoclassical styles.