What is the first step if rooms are not recognized as room bounding in a linked model?

Enabling room bounding for the walls in the linked model is the first step to ensure that rooms are recognized correctly in Revit. Room bounding elements are necessary for defining the physical boundaries of a room within the software. If the walls in the linked model do not have this property enabled, Revit will not recognize them as boundaries for the rooms, leading to issues in room calculations, schedules, and visibility in the model.

When walls are defined as room bounding, they inform Revit about the extent of the room's boundaries. This is crucial because rooms rely on these boundaries to calculate area, volume, and for proper placement in the model. Therefore, checking the walls for room bounding status is an essential troubleshooting step if rooms are not being recognized.

Re-linking the model doesn't address the specific issue of room bounding, and merely checking wall types might not yield a solution if they lack the necessary room bounding property. Adjusting room settings within the project may help optimize the room properties further but would not resolve the fundamental problem of the boundaries not being recognized. Thus, the most immediate and effective action is to enable room bounding for the walls in the linked model.