“We tend to innovate on our facades,” Joshua Ramus of REX says about his New York–based firm’s portfolio, which now includes a 450,000-square-foot office building in Washington, D.C. It helped that, until recently, REX shared a studio with facade consultant Front, a collaborator on nearly every major project the architecture firm has undertaken. Two projects, Vakko Fashion and Power Media Center in Istanbul and Five Manhattan West in New York’s Hudson Yards, involved putting a fresh face on old structures: the former incorporated large panels of curving slumped glass and the latter a pleated glass curtain wall. By virtue of its typology—requiring flexible raw space—and its corner site, with two prominent street frontages, the 12-story office building in the nation’s capital, despite being new construction, again focuses on the building’s skin. With an ethereal all-glass facade comprising 978 identically fluted panels along the entirety of its north and west sides, the rectangular 2050 M Street sits like a jewel in the city’s Golden Triangle business district, between Dupont Circle and the White House.