Old Portal de Mercaderes in the historic center of Mexico City was and is the west side of the main plaza (otherwise known as the "Zócalo"). This side of the plaza has been occupied by commercial structures since the Spanish Conquest of Mexico in 1521. Today the west side of the square is dominated by two sets of buildings with Madero Street dividing them as it runs west from the Zocalo to the Palace of Bellas Artes. The buildings on the north side of Madero is occupied by offices on the upper floors and shops at ground level. The southside buildings are dominated on the ground floor by fine jewelry stores, marking the beginning of the "Centro Joyero Zocalo." This center extends west for two block engulfing Palma Street between Madero and 16 de Septiembre streets.