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Terence L Thornhill, Architect is a talented, award-winning Washington State architectural firm located in the Tri-Cities engaged in the pursuit of design excellence.Ý Our outstanding design capabilities are evidenced by our broad knowledge in diverse projects including design and master planning of commercial offices, retail facilities, medical laboratories, physician offices, law offices, schools, churches, municipal facilities, hospitality facilities, residential remodels and home improvements, custom residences and spec homes, multi-family residences, and much more.