Arcadis North America, Gensler, Stantec, KTGY, AO, SCB, KPF, JLL, and AC Martin top Building Design+Construction's ranking of the nation's largest apartment building and condominium architecture and architecture/engineering (AE) firms for 2026, as reported in BD+C's 2026 Giants 400 Report.

Source: Building Design+Construction's 2026 Giants 400 Report