I've read some description of certain house design as below:
Living and dining rooms are towards the front with kitchens to the rear, with bedrooms either off the hallway or upstairs if it's a two-storey terrace.
as I understand, and which can be seen from the floor design, "bedrooms are off the hallway" sort of indicates that bedrooms are separated by and adjacent to the hallway, and here "off" is preposition, but I'm not sure which one of the two preposition definitions fits it.
The definition "situated or leading in a direction away from (a main route or intersection)." seems close but I think it's used to describe something not adjacent to the main route such as in "my house is off the main road", which is obviously not the case in above house plan example.
Thanks in advance for your help!