Baltzs early black and white photographs depict the architecture of the urban landscape, and were often displayed in Minimalist grid-like structures. Devoid of human presence, these images of blank concrete walls and characterless buildings suggested abstract paintings.
In the series The new Industrial Parks near Irvine, California 1974, Baltz examined the offices, factories and parking lots of an industrial park in minute detail, exploring the anonymity of the man-made environment. In the late 1980s, he settled in Europe, and began to work in colour, often making larger prints. For the series Sites of Technology 1989-92, he photographed the clinical, pristine interiors of hi-tech industries and government research centres, principally in France and Japan.