gistfile1.txt

add_filter('propertyhive_property_query_meta_query', 'remove_department_constraint', 10, 2);
function remove_department_constraint( $meta_query, $q )
{
    $new_meta_query = array();
	
	foreach ( $meta_query as $query )
	{
		if ( !isset($query['key']) || (isset( $query['key']) && $query['key'] != '_department') )
		{
			$new_meta_query[] = $query;
		}
		else
		{
			$new_meta_query[] = array(
				'key'     => '_department',
				'value'   => array( 'residential-sales', 'village-country', 'new-homes-land' ),
				'compare' => 'IN'
			);
		}
	}
	return $new_meta_query;
}