Late Twentieth Century
1970 to 1999: the bracket after mid-century and before the millennium, covering the postmodern turn, the high-tech buildings and the first wave of warehouse conversion.
late twentieth century
THE WEAKEST TERM ON THIS AXIS, and flagged rather than dressed up. The trade has no settled label for these thirty years - it dates by decade, or reaches for a style name instead - so this is a bucket the axis needs for completeness rather than a period anyone asks for by name. Expect it to be split or renamed once there is usage evidence to split it on.