main office
head office

He got up and went to the door to the main office.

And don't go straight either, which will take you to the main office.

She held open the door and they went into the main office.

I had a note from the main office saying he wasn't coming.

How could he ask that when the main office was light years away.

I put the pictures of the second room on the floor and went back into the main office.

He moved to the main office to become director of federal projects.

I went up to their main office to suggest just that.

But that's not the main office they've got a big one.

Do you want the main office to think we can't handle our own problems?