\begin{tabular}{l cc c cc}
\toprule
 & \multicolumn{2}{c}{Same parcel in training} & & \multicolumn{2}{c}{Same coordinates in training} \\
\cmidrule{2-3}\cmidrule{5-6}
Model & Yes & No & & Yes & No \\
\midrule
\multicolumn{6}{l}{\itshape All test sales}\\
\quad A5 Quadratics & 19.8 & 19.1 & & 19.2 & 19.2 \\
\quad A6 Splines & 18.3 & 17.5 & & 17.8 & 17.6 \\
\quad D3 Random forest & 14.6 & 14.6 & & 11.7 & 15.7 \\
\quad D4 Boosting & 14.5 & 14.4 & & 12.0 & 15.3 \\
\quad D5 Boosting, no coord. & 22.9 & 23.3 & & 20.0 & 24.5 \\
\quad D6 $k$-NN comparables & 22.2 & 21.0 & & 16.7 & 22.9 \\
\quad Test sales & 17,219 & 85,710 & & 27,475 & 75,454 \\
\midrule
\multicolumn{6}{l}{\itshape Condominiums only}\\
\quad A5 Quadratics & 17.4 & 18.4 & & 18.0 & 20.3 \\
\quad D4 Boosting & 9.0 & 9.1 & & 8.9 & 10.2 \\
\quad Test sales & 3,374 & 11,474 & & 13,261 & 1,587 \\
\bottomrule
\end{tabular}