Block 162 is a 30-story office tower under construction at 675 15th St. in downtown Denver, which broke ground in June. With a 2½ year construction timeline, followed by 1½ years of lease up, the 595,000-square-

Like the mountain range that inspired it, 1144 Fifteenth rose from earth to sky only when all conditions were right. Both subtle and seismic shifts in the real estate market, the national economy, design technology and tenant