please change the paragraph to be logical.
His most significant non-residential commission in New Haven was the City Hall (1860), a polychrome, asymmetrical, Gothic Revial structure, which. Significantly altered in the 1980s.
His most significant non-residential commission in New Haven was the City Hall (1860), a polychrome, asymmetrical, Gothic Revial structure, which, although significantly altered in the 1980s.