The 1921 Tulsa Race Massacre Commission earmarked $20 million for the project, and its purpose is to educate visitors about the massacre.
The building has not been uncontroversial. Some public officials say they oppose the way the money was spent.
Phil Armstrong is the chair of the commission. He spoke at the opening ceremony to a crowd seated in folding chairs at the corner of Greenwood Avenue and Archer Street.
He began by thanking various donors, including Mary Ann Hille of Hille Foundation who donated the land for the center.
“In spite of what some of our critics have said, yes, donate means 100% free and clear with no strings attached,” said Armstrong.