Hiding in plain sight in Baldwin Park, CA: I'd bet a dollar that this house at Baldwin Park Boulevard and Shadylawn was a gas station once upon a time:
Redfin says it was built in 1952 but it looks older.
EDIT: Checked Historic Aerials and the 1948 shot shows vacant land, while the 1952 shot seems to show it under construction. Next available is 1964 and it looks residential with trees, so... guess I need a time machine to know for sure.