Tulsa, Okla. — Major changes may be ahead for Tulsa's Gilcrease Museum.

The city institution is planning a 75-million dollar renovation and expansion.

The project would be the largest makeover in the museum's 70-year history.

The museum has been known for its western heritage art.

The change would showcase their artwork in an effort to reach a more diverse audience.

The expansion was approved by voters in the Vision Tulsa tax package.