There is a tower-like structure with a pole near north-west corner of Kowloon Hospital in one of the old aerial photos. While browsing the 2021 Geoinfo Map, the location is named "Hong Kong Observatory Signal Tower".
Looking into a few old aerial photos dated in ~1947, 1949 and 1969, there was a similar structure at the same location.
In an old "Storm and Strong Monsoon Signal Station" leaflet, there appeared one station located at Kowloon Hospital as well.
Is there any similar signal station still in the territory? preWWII or postWWII?
Hong Kong Observatory Signal Tower ( https://www.map.gov.hk/gm/s/B/1108230773 )
File2302.jpg, by Jim Watkins (https://gwulo.com/atom/20993)
The building circled in red is the Block M of Kowloon Hospital. The Signal station is located at the NW of this building, a white structure (zoom view), at the upper edge of the aerial photo. Source : Heritage Impact Assessment on Block M at the Kowloon Hospital (Survey and Mapping Office,1949)
The signal station is a small structure near the northwest corner of Kowloon Hospital. The Red circle is the new west wing under construction. ( Source: Heritage Impact Assessment on Block M at the Kowloon Hospital )
HK Observatory Signal Station - Kowloon Hospital, by Herman (2021)