Can You Identify This 1906 Building?

Whoa, how cool is this old colorized photo. You’re looking at a “horseless carriage” back in 1906. The passenger is Senator George P. Wetmore of Rhode Island. Can anyone identify the building in the background?

Washington, D.C., circa 1906. “Senator George P. Wetmore, Rhode Island.”

Source: Shorpy

Here is the original source image in black and white.

Black and white photo