A mix of residential, commercial and entertainment properties is essential to a buoyant, successful big-city downtown, as Calgary, Alberta, learned the hard way. One of Canada's major urban hubs, the town suffered from energy and real estate busts 15 years ago. Now, with a new economic boom prompting the addition of 9.6 million square feet of new office space by 2011, city planners want to add downtown residents as well as buildings.

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