Correction, 1/10/2013, 10:45 a.m. EST: The original version of this story contained an incorrect figure for the amount of space Arnold & Porter has leased in the Washington, D.C., building its office there will move to in the fall of 2015. The correct figure is 375,000 square feet. The fourth paragraph of this story has been revised to reflect the correct information. We regret the error.

Law firms are shaking up the commercial real estate market around the country, plotting office moves, gutting their current spaces, and reassuring landlords with lease renewals.