四大樓商業區

四大樓商業區（Cuatro Torres Business Area，簡稱CTBA）是位於西班牙馬德里的小型商業區，於2008年落成。因商業區內有四幢摩天大樓，因而得名。在西班牙高樓名單中，該四幢亦佔據了第一至第四名。該四幢大樓分別為：

參考資料
*[https://web.archive.org/web/20101019002403/http://www.peri.de/ww/en/projects.cfm/fuseaction/showreference/reference_ID/1003/referencecategory_ID/6.cfm CTBA - PERI.de]
*[https://web.archive.org/web/20061028190112/http://www.emporis.com/en/wm/cx/?id=100631 CTBA - Emporis]
*[https://web.archive.org/web/20080601034835/http://urbanity.blogsome.com/2005/12/21/paseo-de-la-castellana-en-2008/ CTBA - Blogsome]
*[http://urbanscraper.blogspot.com/search/label/4TORRES/ CTBA - Blogspot]

外部連結
*關於CTBA的渲染圖：[http://farm1.static.flickr.com/137/348407016_bd8321b2ee_o.jpg] [http://bp3.blogger.com/_m3IiRgNd_Xk/RertdhAdV1I/AAAAAAAABh8/p_HUksp5WMM/s1600-h/renderctbakg5.jpg][http://static.flickr.com/6/76026955_1680e7066c_o.jpg] [http://static.flickr.com/39/76026952_86179a7e75_o.jpg] [http://static.flickr.com/43/76026954_849d453e3f_o.jpg] [http://static.flickr.com/36/76026953_ff2c80403b_o.jpg] [http://static.flickr.com/38/76026956_9a0f340b90_o.jpg]