The palatial building that houses the Buenos Aires Water Company's offices takes up an entire city block. Built at the 19th century, the eclectic French Renaissance facade is covered by over 300,000 glazed terracotta tiles. Inside, the atrium contains 12 tanks that were once used to store 72 million litres of potable water. There is a small water works museum on the second floor open Monday to Friday from 9 am to 1 pm. Free Spanish-language tours Monday, Wednesday and Friday at 11 am.