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1\begin{table}[htbp]2\centering\footnotesize3\caption{Task A — mean absolute SHAP value (×100, log-price units) of the LightGBM model at three origins, 4,000 test sales each}\label{tab:shap}4\resizebox{\textwidth}{!}{%5\begin{tabular}{lrrrr}6\toprule7Feature & 2023-03 & 2024-03 & 2025-03 & Mean \\8\midrule910 nearest past sales: quality-stripped log price & 23.2 & 21.6 & 20.8 & 21.9 \\10log floor area (centred) & 13.9 & 14.0 & 14.1 & 14.0 \\11age & 10.0 & 9.8 & 9.3 & 9.7 \\12origin month (time index) & 8.9 & 3.1 & 1.0 & 4.3 \\13log lot area (centred) & 3.5 & 3.6 & 3.6 & 3.6 \\14municipality: quality-stripped level, 12 m & 3.4 & 2.7 & 4.0 & 3.4 \\15northing & 3.1 & 3.3 & 2.9 & 3.1 \\16municipality: median log price, 3 m & 2.7 & 3.1 & 2.3 & 2.7 \\17distance to the 10 nearest sales & 2.8 & 2.3 & 2.2 & 2.5 \\18easting & 2.5 & 2.5 & 2.3 & 2.4 \\19dispersion of the 10 nearest sales & 2.0 & 2.3 & 2.4 & 2.2 \\20property\_class=condo & 2.1 & 2.1 & 2.4 & 2.2 \\21subtype\_c=detached & 1.9 & 2.1 & 2.1 & 2.0 \\22log floor area squared & 1.4 & 1.4 & 1.5 & 1.4 \\23municipality: sales, 3 m & 1.6 & 1.4 & 1.1 & 1.4 \\24\bottomrule25\end{tabular}}26\par\vspace{3pt}\parbox{\textwidth}{\footnotesize Importance is predictive, not causal. Origin-month importance declines as the training history lengthens.}27\end{table}28