In Denver, developers are building high-rises, duplexes, and so-called â€œMcMansions,â€ often next to smaller, older homes. Meanwhile, preservationists want to maintain neighborhood character. City officials, looking for the root cause, point to Denver's outdated zoning code. Overhauling the code is a key element of Mayor John Hickenlooperâ€™s Blueprint Denver, a comprehensive plan for land use and transportation. Ryan Warner talks to Denver's planning director, Peter Park.