CBRE|Hubbell Commercial unveiled its annual commercial real estate market surveys Tuesday with some news that landlords and renters have known for some time: Rents are rising. But help could be on the way as Greater Des Moines girds for an additional 4,000 units in the next few years, The Des Moines Register reported. The reports were presented to an audience of bankers, investors, developers and public officials and a panel discussion featuring CBRE|Hubbell Commercial market specialists was moderated by Register reporter Joel Aschbrenner.