The Hudson’s Bay Centre office tower in downtown Denver has sold to a local buyer for nearly 80 percent less than it fetched a decade ago. Denver-based Dikeou Realty bought the 20-story building at 1600 Stout St. on Monday for $8.95 million, according to public records. That works out to about $52 a square foot for the structure, which CBRE marketing materials described as nearly 172,000 square feet.