JR East's Tokyo Branch will dismantle the old Harajuku Station building at the end of August and build a replacement (to be as visually identical as possible) next to the new station building. This was meant to be done after the 2020 Tokyo Olympic / Paralympic Games but given its delay they might as well start now
https://www.jreast.co.jp/press/2020/tokyo/20200807_to01.pdf