By comparison, the Northwest corridor between Boulder and Denver, which depended heavily on telecommunication companies such as Level 3, Sun Microsystems and the bankrupt 360Networks, has the dubious distinction of the highest vacancy rate of any of the dozen submarkets tracked by Grubb & Ellis. The Northwest corridors' vacancy rate is 25.6%.

The Southeast Suburban market, the largest submarket with 25 million sf compared with 22.9 million sf in the CBD, has a 17.4% vacancy rate. Only the CBD 's vacancy rate is below the overall average vacancy rate of 15%.

The CBD also commands the highest asking rental rates at $26.97 per sf for class A space and $21.61 for class B space. The Northwest corridor 's asking rate for class A space is $23.77 and $18.30 for class B space. The Southeast Suburban's asking rate for class A space is $23.08 per sf and $20.51 for class B space.