The Joseph W. Pepin Memorial Building formally known as Alternative Center for Excellence (ACE) and the Alternative Center for Education, is located in the former Locust Avenue School at 26 Locust Avenue in Danbury, Connecticut, United States. It is an alternative high school within Danbury Public Schools, meant for at-risk students. Today it is the last nineteenth-century school building remaining in Danbury, and one of the few remaining laboratory school buildings in the state. It was listed on the National Register of Historic Places in 1985.