On the streets of downtown Denver, it can feel like parking is disappearing as apartments and offices replace surface lots. But if you look up, there’s a different story playing out. Many of the city’s new towers stand on parking “podiums” that can pack hundreds of automobiles into a project’s lower floors. “The peculiar thing is, the public’s impression has always been there’s not enough parking,” said Chris Nevitt, the city’s manager of transit-oriented development.