In her seminal book The Death and Life of Great American Cities, city-builder Jane Jacobs noted that “a Central Business District that lives up to its name and is truly described by it, is a dud.”

Jacobs’ call was for the centre of a city to have a mixture of uses that were more than the traditional focus on jobs. She called for a diversity that made cities bustling people places 24/7. Two recent planning policy changes to the CBDs of Sydney City and Parramatta may…