I recreated the backrooms as a lot on Sims4. With custom content so you will have to install manually.
from the wiki The Backrooms is a creepypasta inspired by a comment on a picture of an “unsettling room” on 4chan’s /x/ board. The comment inspired an expanded creepypasta and YouTube videos reading the creepypasta.
Thank you to all the custom creators LittleMsSams, SBS, Keishuh, AST4, AroundTheSims, Mimoto, Amoebae, Sg5150, Felixandre Tudor, Mio, SugarBabySims
On the Sims 4 Gallery without custom content it is under SusuSim76. I can’t find it so I cannot unfortunately post the link. If I get it I will.
The Backrooms in action