You should try adding small important details to the pipes or wires perhaps try switching up the material on the details such as the wires - bolts.
Consider adding small lights on the left side of the building walls throw a few parts on the ground “since parts of the building are breaking up” vents on the walls so it has that effect your wanting it seems like the building lacks small details, underground facility normally feature pipes different lighting source and usually items along the surface wall. I wouldn’t recommend adding much experiment into adding additional details?
Perhaps add some variation of materials as it would (give the walls a more natural choice).