Docomomo. It sounds like a downtown nightclub or indie music label. It’s instead an organization founded for the worldwide documentation and conservation of architectural sites of the Modern movement. If architect Brooks Walker was only vaguely familiar with the group and its mission before he and interior designer Douglas Durkin began remodeling a Modernist building listed on the National Register of Historic Places, by project’s end the catchy quasi-acronym—certainly, the challenge it represented in commingling new architecture with old—was a steady backbeat to the work.