When Monica Walton walked into her Broomfield office at Level 3 Communications on Wednesday morning, she already felt nostalgic.

"I came in and the sign has been changed on our campus," said Walton, who has worked for Level 3 for 12 years and on Wednesday became CenturyLink's general manager for Colorado. "This is happening globally, though not immediately everywhere. There are still a number of Level 3 buildings in Denver with Level 3 signage. That's the first step of combining the companies."