Chicago (AP) — After five years of legal battles, gentrification concerns and a federal review, Barack and Michelle Obama attended a celebratory groundbreaking Tuesday on their legacy project in a lakefront Chicago Park.

Construction on the site along Lake Michigan, near the Obama family home and where the former president started his political career on Chicago’s South Side, officially began last month. Work on the Obama Presidential Center is expected to take about four years.

The Obamas hosted the event, which was streamed online to limit crowds amid the coronavirus pandemic, with Chicago Mayor Lori Lightfoot and Illinois Gov. J.B. Pritzker.

Barack Obama told ABC’s “Good Morning America” in an interview broadcast Tuesday that he hopes the center will bring an economic boost to Chicago’s South Side and also inspire the area’s young people.

“There’s young people who are enormously talented but often forgotten and so for us to be able to build a world-class institution that will attract millions of people hopefully will send a signal that those young people count, those young people matter,” he said.

The presidential center, which will sit on 19 acres (7.7 hectares) of the 540acre (291-hectare) Jackson Park, will be unique among presidential libraries.

Obama’s presidential papers will be available in digital form. The sprawling campus center will include a museum, public library branch, athletic center, test kitchen and children’s play area.

The initial cost of the center was projected at $500 million, but documents released by the Obama Foundation last month showed it is now roughly $830 million. Funds are being raised through private donations.

Progress on the center has been delayed by lawsuits and a federal review required because of the location of Jackson Park, which is on the National Register of Historic Places. At the same time, fears about displacing Black residents in the area developed into a year’s long battle resulting in city-approved neighborhood protections, including for affordable housing.

Obama chose Chicago over several cities including Honolulu, where he was born and spent his early years.

It’s a part of Chicago that has special significance for the Obamas. The center is near the University of Chicago where Obama taught law and where the Obamas got married and raised their two daughters. Michelle Obama also grew up on the South Side.

“Part of the reason we’re here is just about everything that’s important to me in my life started here,” Obama said in the “Good Morning America” interview and during his presentation at the ground-breaking ceremony.

Michelle Obama said in a video announcement that when it came time to plan the Obama Presidential Center the couple “wanted to give something back to the place that gave us so much.”