 This facility became St Stephen's Hospital in 1925 and, after it had joined the National Health Service in 1948, continued in service until it closed in 1989.Part of the old hospital survives as an HIV unit known as "St Stephen's Centre".The Chelsea and Westminster Hospital, which was designed by the architects Sheppard Robson, was built on the St Stephen's Hospital site and was officially opened by the Queen in May 1993.