The offices are special because they are in the capitol instead of across the street in the office building for House rep offices. The Capitol was originally built big enough to hold all the offices but the House size kept growing as the population grew until they capped the number of reps in the House. So the House offices were moved across the street. The Senators still have offices in the Capitol. There were offices available in the Capitol that were assigned for House use but they kicked Pelosi and Hoyer out of their capitol offices instead of just moving them.