Not enough attention is paid to the entries into buildings nowadays, in my opinion. Below is the door to the Paul Brown Building.
Below is the door to the Southwestern Bell Building.
Below is a building’s door on the east side of Old Post Office Square, which is an excellent example of Classically inspired architecture.
Update: Pyramid Companies went bankrupt, but the building’s renovation by a new company was completed in September 2015.
And finally, the door to the Arcade Building.