In the historic center, there are an estimated two thousand doors, of which there are at least two thousand courtyards of various sizes. Many of these have been restored to their former colonial state, with facades of ochre, orange and yellow, windows and doors framed by handcrafted ironwork and made of hewn wood. The interior roofs are flat, of heavy mortar supported by large beams. Very few structures have atriums or front yards; instead, open private space is behind the main facade in courtyards.