Unlike the residential market, which is essentially single family housing and most often dealing with remodels, the commercial sector is a vast sea of segments, ranging anywhere from corporate offices to healthcare to education to hospitality to retail to government/military and technically anything else not handled by the typical neighborhood retailer.
And, unlike residential, which is generally easier to gauge in terms of how business is doing, the vastness of the commercial market can be hard to figure out, as one segment could be booming while another is struggling. By the same token, how the commercial sector is doing could also depend on where you are in the country as some places are more suited to a particular area, such as government/military or healthcare.