Robert "Bob" Frasca, the co-founder of Portland-based ZGF Architects and whose body of work helped define the city's skyline, died Jan. 3 of complications from leukemia, the firm said Monday. He was 84.

The Oregon Convention Center, KOIN Tower and Portland World Trade Center are among his most recognizable works. Many of his other projects are part of the city's fabric, including Tom McCall Waterfront Park, Oregon Museum of Science and Industry, and Portland International Airport.