The post refers to a “gate”, which I assume means an entrance from the street to the whole property, rather than a “door” which would give access to the building.
You know what they say about “assume”. It’s quite possible that the gate is the vehicle access to the block, i.e. the building. If you look at Austman’s post below, you will see that if there is no other pedestrian exit within specified proximity, then the gate has to also function as an emergency exit. That would be an unusual set of circumstances but not impossible.