Tlacotalpan has retained an unusual density of high-quality historic buildings that provide architectural harmony and homogeneity. IntegrityThe integrity of Tlacotalpan’s historic zone is established by the retention of the original grid pattern of the and the relationship of buildings to open spaces with mature trees. A significant number of surviving historic buildings exhibit traditional elements including the exuberant colours and tile roofs. Protection and management requirementsThe conservation of the historic centre of Tlacotalpan is legally protected at both the state and federal level. In 1986 it was declared a Historic Monuments Zone by federal law with the responsibility for its management under of the national organizations Instituto Nacional de Antropologia e Historia (INAH) and Instituto Nacional de Bellas Artes (INBA).