Castle Peak Police Station (1st generation) [c.1925- ]
Position of marker is approximate.
I'm not 100% sure it was called Castle Peak Police Station. It may have been named after one of the nearby villages such as San Hui.
The dates are an estimate, based on the years that this police station appears on the maps at http://www.hkmaps.hk/mapviewer.html. As of 23 May 2019, the earliest map that shows it is "Map 1928" (not shown on "Map 1922"), and the latest map that shows it is "Map 1957" (not shown on "Map 1960").
Some time in the early-mid 1950s, a new Castle Peak Police Station opened, further south along Castle Peak Road (see: https://gwulo.com/node/45964).