Any Backrooms canon is fine. Kane Pixel's & the movie's canon with the still lives & Asynce. The wiki's canon with the levels & entities. Any canon you want to put them in.

This is mostly a joke question, but I am kinda unironically curious.

Bear with me — just a few more out-of-order *non-*landmark entries. Next up is post #436 for the LA Noire Freeroam Explorer Project — posting locations replicated by Team Bondi for LA Noire (currently touring the downtown area) that are not considered landmarks (either official or historic) but do have real-world equivalents.

Argyle Hotel

142–146 South Olive Street

Built in the 1870s, this Mansard-roofed Victorian landmark was the oldest hotel structure on Bunker Hill. Transitioning into a mid-century residential hotel, its street-level storefronts housed a grocery and laundry. It anchored the corner until cleared during post-war urban renewal.

Real-World Businesses and Points of Interest on the LA Noire Fandom Wikia site
Interactive LA Noire Touring Map on the LA Noire Fandom Wikia site