Completed on time and on budget in December, the project involved the full renovation and restoration of the Bird House, one of the signature exhibits of  the National Zoo.

The $71-million project involved extensive renovation of a Gothic Revival-style national historic landmark erected in 1894.

As a facility that delivers world-class diplomatic training and career-long learning opportunities, this 220,000-sq-ft, four-story building provides office suites and classrooms along with a large multipurpose room to accommodate a variety of functions.

In 2006, the 79-year-old memorial’s white dome started getting covered in dark splotches and water began to infiltrate the portico roof.

The project team says that preserving the U.S. Capitol’s ornate facade involved “firsts” in the nation for the successful execution of large-scale laser ablation cleaning and stone consolidation to conserve a marble exterior.