Hi, as far as I understand tag "amenity=police" should be used for public-facing facilities (hence "amenity"): https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dpolice

Which makes sense, i.e. someone mugged me, so I look up where is the nearest police station and head there.  I don't think you can come to RCMP headquarters if you want to report something. 

This looks more like `landuse=institutional` or `landuse=commercial` with maybe some `police=*` tags.