location ~ ^/images/([avatar|building|block|offer|floor]+)(.+\.[jpg|jpeg|gif|png]+)$ {

            expires 1y;

            valid_referers none blocked server_names ~\.site\.loc ~\.google\. ~\.yandex\.;

            if ($invalid_referer) {
                return 403;
            }

            root $root;

            try_files /upload/preview/$1$2 /upload/original$2 /index.php$is_args$args;

            error_page 404 403 415 /blank.gif;
        }