Second Unitarian Church (now known as Temple Sinai) is a historic church and synagogue building at 11 Charles Street in Brookline, Massachusetts. Thee meeting house was built in 1916 for a Unitarian congregation. The building was added to the National Register of Historic Places in 1985. The historic church building is now home to Temple Sinai, a Reform Jewish congregation. Brookline is a town in Norfolk County, Massachusetts, United States, which borders on the cities of Boston and Newton. As of the 2010 census, the population of the town was 58,732.