Considering there are no applications to redevelop that site, I'd expect the owners will try to re-lease the building in the short-term.
That being said.. There is the possibility that the property owners (CC Retail Holdings) may have plans underway for the site behind the scenes, just no formal application submitted. The lot that the Best Buy building sits on also includes a portion of the Central City mall as seen in the image below. It seems unlikely that Central City Retail Holdings would develop this site themselves, and more likely that the lot would be subdivided to create a new lot East of the Skytrain guideway, and sold off to another developer.
The city wants to turn the mall access road in front of Central City into an actual dedicated road anyway (the extension of City Parkway), so makes sense that this parcel would be split into 2, separated by a new road. Just speculation but makes the most sense it seems.