An old Etna steel mill could become the newest landing spot for tech firms in the region. New York-based The AM Group has acquired a block-long, three-story industrial building at 51 Bridge St. in Etna with plans to convert it into tech-flex space, according to an announcement by the Jones Lang LaSalle real estate firm….

New York-based AM Group, currently a minority partner in the redevelopment of the New Federal Cold Storage Building in the Strip District, has bought the 89,000-square-foot mill shed from a local family and is devising a plan to reconfigure it into new-era uses. That calls for expanding the space to a total of 100,000 square…