We rented an office for the new company a few months ago in a building that had just been rehabbed. The building owners had arranged to bring Comcast into the building, but for obvious reasons we wanted to avoid Comcast and called AT&T. AT&T couldn't run cable to the building without significant modifications to the building's wiring. All the conduit intake was installed by Comcast. The "phone closet" was full of Comcast equipment. There is, so far as we know, literally no way to get any service in the building besides Comcast --- unless we owned the building and paid tens of thousands of dollars for new telecom buildout.

Getting a new telecom service into an existing building is, in fact, a big deal.