Unable to concentrate, she opened the balcony door and stepped outside.

He opened the balcony window, looked out, saw nothing and closed the window again.

I opened the balcony door.

On this, without waiting for the Queen's answer, he opened the balcony, and told the populace he was ready to depart with his family.

"All right." Because Emma looked much too pale, Marianne rose and opened the balcony doors.