gistfile1.txt

add_action( "propertyhive_property_imported_gnomen_xml", 'import_new_home_custom_field', 10, 2 );
function import_new_home_custom_field($post_id, $property)
{
    if ( isset($property->property_no) && strtolower((string)$property->new_home, 'preown') !== false )
    {
        update_post_meta( $post_id, '_new_home', 'Pre-owned Home' );
    }
    else
    {
        update_post_meta( $post_id, '_new_home', 'New Home' );
    }
}