Read this: During this era of Porfirian rule, the city underwent an extensive modernization. Many Spanish Colonial style buildings were destroyed, replaced by new much larger Porfirian institutions and many outlying rural zones were transformed into urban or industrialized districts with most having electrical, gas and sewage utilities by 1908. While the initial focus was on developing modern hospitals, schools, factories and massive public works, perhaps the most long-lasting effects of the Porfirian modernization were creation of the Colonia Roma area and the development of Reforma Avenue. Many of Mexico City's major attractions and landmarks were built during this era in this style.

What was built during the modernization?
What is the answer? (If it cannot be answered, return "unanswerable")
hospitals, schools, factories and massive public works