// route
    add_action( \'init\', array($this, \'wpse26388_rewrites_init\') );
    add_filter( \'query_vars\', array($this, \'wpse26388_query_vars\') );

    function wpse26388_rewrites_init(){
        add_rewrite_rule(
            \'properties/([0-9]+)/?$\',
            \'index.php?pagename=properties&property_id=$matches[1]\',
            \'top\' );
    }
    
    function wpse26388_query_vars( $query_vars ){
        $query_vars[] = \'property_id\';
        return $query_vars;
    }