Our company has two buildings and they are referred to in internal communications in various forms. e.g., "the north building", "the North building" and "the North Building". I am aware that "north" as a direction is not capitalised. In our case the building names are North Building and South Building so both words should be capitalised.
Should the definite article be dropped? e.g., "Please proceed to North Building." vs. "Please proceed to the North Building."