Screenshot: ENR Groundbreakers STO Building Group CEO Bob Mullen (left) offers a business strategy update to ENR Senior Editor Emell Adolphus in a recent Groundbreakers podcast interview New York City-based building contractor STO Building Group has created three new business lines to reduce delays and increase project flexibility amid rapidly shifting market conditions, CEO Robert "Bob" Mullen shared in a recent ENR Groundbreakers podcast episode. With its corporate units operating independently under the STOBG umbrella, the company’s new facilities construction services line serves as an end-to-end solutions partner for small teams, he explained. Its construction procurement solutions line manages relationships with equipment manufacturers to expedite delivery. While its elevator construction consulting business designs, builds and installs elevators and elevator equipment. Mullen explains that the company’s facilities business grew from a need to support the diversity of project sizes in its portfolio.…