$sSQL .= ' st_x(centroid) AS lon, ';
$sSQL .= ' st_y(centroid) AS lat, ';
// slightly smaller than the importance for normal houses
$sSQL .= ' -0.1 AS importance, ';
$sSQL .= $this->addressImportanceSql('centroid', 'blub.parent_place_id');
$sSQL .= ' st_x(centroid) AS lon, ';
$sSQL .= ' st_y(centroid) AS lat, ';
// slightly smaller than the importance for normal houses
$sSQL .= ' -0.1 AS importance, ';
$sSQL .= $this->addressImportanceSql('centroid', 'blub.parent_place_id');