Board of Water Supply. View of Manhattan in foreground and Brooklyn in background looking east from the 35th floor of the Municipal building. Manhattan Bridge left. Brooklyn Bridge right. The Board of Water Supply and the Department of Water Supply, Gas and Electricity occupied several offices on high floors of the new Manhattan Municipal Building, commanding spectacular views. Running across the lower end of the image is the 3rd Avenue Elevated subway, demolished in the 1950s. June 16, 1914.