I am looking for a term for unobtrusive architecture amidst architecturally superior ensemble. E.g., a contemporary building in a college campus or in a European old town that features some stylized elements and color of the old buildings, but is generally bland and deliberately "un-architectural," purely functional building. It tries to blend in and not to rival with the original architecture.

Sentence: In the 1950s, the university leadership sought to expand the old campus with modernist buildings, but after a severe public backlash, they opted for a conservative solution, settling on typical \_\_\_ architecture/buildings for good. [or something similar]