This is the Denny's headquarters building in Spartanburg, South Carolina. Built circa 1990, but it has strong '70s brutalist vibes.
Originally built as part of an effort at downtown renewal, it juts out from the skyline and looms over everything. The instagram account @dennyslooming documents its moods and portents.
h/t Spartanburg's own @GennaContino for introducing me. I have a long list of questions about this building now and I aim to find answers!