There has been a ton of new construction and housing prices have skyrocketed in the past 2 years while many people rolled the dice with exotic mortgages in the hope of selling for a profit. This is the same story you have been hearing nationwide. There are for-sale signs everywhere and new home builders are having to offer steep incentives to move inventory. As you can see at
HousingTracker.net: Median Home Asking Price & Inventory Data for Salt Lake City, Utah inventories are up 85% over the past year and are rapidly increasing while listing prices are plummeting. It's not so much a population decline (rather from what I have experienced, population is rising rapidly), but the ability of builders to quickly get homes to market has caused a correction in housing demand.