While assessment of the building's architecture has followed the vagaries of architectural style, the building was acclaimed by some architects such as the American Institute of Architects, and was also praised by publications including The New York Times and The Boston Globe, among others; it was awarded three stars by the Michelin Green Guide, among others.
Representative of its acclaim was the opinion of New York Times critic Ada Louise Huxtable, who wrote, "What has been gained is a notable achievement in the creation and control of urban space, and in the uses of monumentality and humanity in the best pattern of great city building. Old and New Boston are joined through an act of urban design that relates directly to the quality of the city and its life."
Architect, educator, and writer Donlyn Lyndon wrote in The Boston Globe that "Boston City Hall carries an authority that results from the clarity, articulation, and intensity of imagination with which it has been formed." Architectural historian Douglass Shand-Tucci, author of Built in Boston: City and Suburb, 1800–2000, called City Hall "one of America's foremost landmarks" and "arguably the great building of twentieth-century Boston."
Stylistically, City Hall is considered by a few one of the leading examples of what has been called Brutalist architecture. It is listed among the "Greatest Buildings" by Great Buildings Online, an affiliate of Architecture Week.[7] Additionally, in a 1976 Bicentennial poll of historians and architects regarding America's greatest buildings, sponsored by the American Institute of Architects, Boston City Hall received the sixth most mentions.