Until recently, the prototype of the Large-Sized Telescope (LST), the LST-1, has stood alone on the CTAO's northern hemisphere array site at the Instituto de Astrofísica de Canarias' (IAC's) Roque de los Muchachos Observatory in Villa de Garafía on La Palma, Spain. But, in 2023, the CTAO LST Collaboration began laying the foundations and constructing the three remaining LSTs planned for the site -- the LST-2, LST-3 and LST-4. It was on 3 May that an important milestone was achieved when the 18-tonne mirror dish structure of the LST-4 was successfully lifted onto its lower structure.