The plaza, located in Chicago's Pilsen neighborhood, was made possible by a $1.9 million state capital grant, and it will serve as an outdoor community gathering space.
The grant was initially awarded in 2014, but was suspended when it was not re-appropriated into an enacted capital bill.
In July 2019, the governor reinstated the project and construction was completed in July.
"These are the kinds of simple but important investments that keep communities strong," Pritzker said. "And after years of delay under prior administrations, I'm really proud to help this museum keep its mission moving forward for many years to come."
The plaza is named after Chicago's first Mexican-American Ward Committeeman, Ray Castro, who grew up in the Lower West Side neighborhood.