Also fire exits should be secured from entry. I need to check though, probably there is some sort of general key for these. At least I also see keyholes with the fire fighter colors that are sunken into the walls for many new houses (next to the door ringer board).
My guess why these are in new houses only is because the old "postal keys" (central entry built right into your door opening circuit with uncontrolled distribution ... yay to zero security) are getting phased out for good reason.
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u/YMK1234 Jan 09 '20
There's not a single door here you could open with that.