The building was deemed "architecturally significant because its Y-shaped plan is unique in Oklahoma and because its designer, Albert S. Ross, is one of Oklahoma's foremost architects....the Ada building is generally considered 'to be Ross's finest achievement.
The building has architectural importance because of its distinctive Y-shaped layout in Oklahoma and the reputation of its architect, Albert S. Ross, as a prominent figure in Oklahoma's architecture....the Ada building is frequently deemed "Ross's finest creation."