[gdlr_image_link type="image" image_url="" link_url="" alt="" target="_blank"] CHATTANOOGA. Heidi Hefferlin and Craig Kronenberg, with Hefferlin + Kronenberg Architects, unveiled their new offices at 1220 East Main Street at a large social gathering June 10 with food, music, and a pop-up gallery throughout the large industrial structure. H + K Architecture = Heidi Hefferlin + Craig Kronenberg The now landmark building near the railroad tracks gets