\begin{table}[htbp]
\centering\footnotesize
\caption{Variables available and their use}\label{tab:variables}
\begin{threeparttable}
\begin{tabular}{p{4.2cm}p{3cm}p{5.2cm}p{1.6cm}}
\toprule
Variable & Source & Treatment & Used in \\
\midrule
Floor area of storeys (m²) & roll & continuous; cubic in centred log & all tasks \\
Lot area (m²) & roll & quadratic in centred log & all tasks \\
Year built / age & roll & nine age bins; missingness indicator & all tasks \\
Storeys, building genre, physical link, dwellings (plex) & roll & categorical & Task A \\
Coordinates, municipality, MRC, region & feed / SDA V2026-07 & location; nested metric cells (WP22) & all tasks \\
Assessment in force at sale & feed & not used as a predictor (post-dated for Task A test sales would be fine, but excluded for comparability) & — \\
Municipal / regional market features at origin & computed from sales $\le$ origin & median log price and quality-stripped level (3/6/12/24 m), momentum, volumes, dispersion & Task A \\
10 nearest past sales ($\le$ 12 m) & computed & mean quality-stripped log price, mean distance, dispersion & Task A \\
Real-time SHARP-HPI vintage (13-month history) & WP22 index\_vintages (smoothed mode) & 1/3/6/12-m changes, volatilities, acceleration, counts, s.e.; parent (region, province) momentum & Task B \\
Bedrooms, bathrooms, parking, basement, condition, renovations, quality, listing, images & — & not available & — \\
\bottomrule
\end{tabular}
\end{threeparttable}
\end{table}