Boulder building housing Zayo, Sphero offices evacuated after partial ceiling/floor collapse

BOULDER — An office building that houses toymaker Sphero Inc. and administrative offices for telecommunications firm Zayo Group was evacuated Thursday morning after a portion of a ceiling/floor collapsed.

The Boulder Police and the Boulder Fire Department taped off the entrance to the multistory building at 4772 Walnut St. in the Tierra Centre Business Park as crews evaluated the damage.

Shannon Paulk, Zayo’s director of corporate communications, said the company was in the process of determining if there were any injuries. Sphero did not immediately return a call requesting comment.

The 46,500-square foot building, constructed in 1999, is owned by Seattle-based real estate investment…