Check the building plans or structural drawings
Look for walls that run continuously from foundation to roof
Identify walls aligned directly above walls or beams on lower floors
Inspect for walls that support floor joists or roof trusses
Look for thicker walls than surrounding partition walls
Check for walls made of concrete, masonry, or load-bearing framing
Note walls located near the center of the building
Identify walls around stairwells, chimneys, or large openings
Look for walls with no obvious non-structural purpose
Verify with a structural engineer before removing or altering any wall