The D.C. office of law firm Curtis, Mallet-Prevost, Colt & Mosle LLP has relocated its headquarters to larger space downtown.

The firm said that its new location, on the top floor of 1717 Pennsylvania Ave. NW, more than doubles the size of its offices and will allow for continued expansion of its practice.

"This relocation marks an important step in Curtis’ ongoing expansion in Washington,” said D.C. Managing Partner Daniel Lenihan.

The firm said that it has added four senior lawyers to its D.C. office since December 2008.

According to its Web site, Curtis has three U.S. offices with 16 professionals working in Washington, five working in Houston and more than 100 based in New York. In addition, Curtis has 10 international offices.