What combination of observations would lead to a caution regarding building stability?

The combination of observations that includes lean, creaks, and heavy contents indicates potential instability in a building. Lean is a clear sign that a structure may be shifting or settling unevenly, which can compromise its integrity. Creaks often denote stress or strain in the building's elements, suggesting that the materials may be under pressure or experiencing failure. Additionally, heavy contents can exacerbate these conditions by adding extra weight to areas that may already be weak or compromised.

When these factors are present together, they raise significant concerns about the safety and structural soundness of the building. Monitoring such indicators is essential for ensuring the safety of occupants and for maintaining the building’s integrity. In contrast, the other combinations of observations point to a building being in good condition or having characteristics that do not inherently raise immediate concerns about stability, focusing instead on maintenance or normal usage without signs of distress.