101Leafy researched the game with the Hilltop Works fan translation patch, English translation by Cargodin
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Tai Chang Road 4F #1OOI4_1
Tai Chang Road 4F #1 is map OOI4_1 of Tai Chang Road, on disc 2. Its floor is cut into 52 zones.
The game has no floor map for this map: it is the only hutong file that ships without one. The layout below is all there is.
Walkable floor
The floor of this map seen from above, drawn from its walk mesh. Edges are white, doors are red, and lighter floor is higher.

Exits lead to
Tai Chang Road 1F #2OOI1_2
Tai Chang Road 1F #3OOI1_3
Tai Chang Road 1F #4OOI1_4
Other maps on this floor
Tai Chang Road 4F #2OOI4_2
Tai Chang Road 4F #3OOI4_3
Tai Chang Road 4F #4OOI4_4
Tai Chang Road 4F #11OOI4_11
Tai Chang Road 4F #12OOI4_12