The postcard is undated, but the various images on this card are shown on the Frith site as being taken in 1910: “Female Quarters”, “Female Entrance”, “Entrance”, “Male Quarters” and “The Terrace”. There have certainly been some changes since it was issued!
The Pinewood Leisure Centre, as it’s now known, is in Wokingham Without rather than in Crowthorne. I believe Pinewood Sanatorium was set up as a TB hospital for patients from London. In World War II it was a US Air Force hospital. In the 1970s the site began being used to house various locals sports clubs and groups. It now houses gym, judo, boxing, shooting, tug-of-war and model railways clubs (amongst others). It also has a mini railway and allotments.
“Wicket Gate, Wellington College”. Wellington College Series No. 5. Franked Crowthorne, 9am, Jy 29 04.