FILE - This illustration released on May 3, 2017 by the Obama Foundation shows plans for the proposed Obama Presidential Center with a museum, rear, in Jackson Park on Chicago's South Side. This view looks from the south with a public plaza that extends into the landscape. Odds still favor the eventual construction of Barack Obama's $500 million presidential museum and library in a park along Chicago's lakeshore. A judge hears arguments Thursday, Feb. 14, 2019, on a city motion to toss a parks-advocacy group’s lawsuit that argues the project violates laws barring development in lakeside parks. (Obama Foundation via AP, File)

FILE - This illustration released on May 3, 2017 by the Obama Foundation shows plans for the proposed Obama Presidential Center with a museum, rear, in Jackson Park on Chicago's South Side. This view looks from the south with a public plaza that extends into the landscape. Odds still favor the eventual construction of Barack Obama's $500 million presidential museum and library in a park along Chicago's lakeshore. A judge hears arguments Thursday, Feb. 14, 2019, on a city motion to toss a parks-advocacy group’s lawsuit that argues the project violates laws barring development in lakeside parks. (Obama Foundation via AP, File)

CHICAGO (AP) — A federal judge gave the green light Tuesday to a parks-advocacy group’s lawsuit that aims to stop for good the delayed construction of former President Barack Obama’s $500 million presidential center in a Chicago park beside Lake Michigan.

Supporters of the project had hoped the court would grant a city motion to throw out the lawsuit by Protect Our Parks, some fearing any drawn out litigation might lead Obama to decide to build the Obama Presidential Center somewhere other than his hometown.

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A lawsuit brought by another group in 2016 helped to scuttle a $400 million plan by “Star Wars” creator George Lucas to build a museum on public land on Chicago’s lakefront. That museum is now under construction in Los Angeles .

Judge John Robert Blakey heard arguments last week on the city’s motion to dismiss. Blakey did toss parts of the suit in his Tuesday ruling, but concluded the group has standing to sue because it represent taxpayers with concerns that providing parkland in the public trust to the Obama center violates their due-process rights.

Blakey’s ruling doesn’t mean the group will necessarily prevail in the end, but confirms that the suit poses a formidable threat to the project. The judge indicated that he doesn’t want the litigation to drag out, and that he would strictly limit any fact gathering leading up to trial to 45 days.

“We are pleased that the court dismissed some of the claims and made clear that the proceedings will move forward expeditiously,” said Chicago corporation counsel Ed Siskel. It was also the view of the Obama Foundation in its one-sentence reaction to Blakey’s ruling.

Blakey tossed the plaintiffs’ claim that their First Amendment rights would be violated if tax money is used to construct a building to promote former President Barack Obama’s political interests. The judge said that question could be litigated only when or if the center actually began promoting political causes.

He also tossed the plaintiffs’ allegation about aesthetic and environmental damage to Jackson Park, saying they hadn’t laid out how specifically they would be harmed as individuals and so had no standing to sue on that issue.

Plans call for the center to be built in Jackson Park, which was named after President Andrew Jackson and was a site for the Chicago World’s Fair in 1893. The site 7 miles (11 kilometers) south of downtown Chicago is near low-income neighborhoods where Obama worked as a community organizer and is just blocks from the University of Chicago where Obama was a law professor. It is also close to the home where the Obamas lived until he won the presidency in 2008.

The center was originally slated to open in 2021, though ground hasn’t yet broken because of the lingering litigation.

In its 2018 suit , Protect Our Parks accused the city of illegally transferring park land to a private entity, The Obama Foundation, effectively “gifting” prized land to a Chicago favorite son. The group said city officials manipulated the approval process and tinkered with legislation to skirt long-standing laws designed to ensure residents have unobstructed access to lakeside parks.

“Defendants have chosen to deal with it in a classic Chicago political way ... to deceive and seemingly legitimize an illegal land grab,” the lawsuit says.

To make the park available for the project, the Chicago Park District first sold the land to the city for $1. Illinois legislators amended the state’s Illinois Aquarium and Museum Act to include presidential libraries as an exception to the no-development rules if there’s a compelling public interest. The Chicago City Council approved the project by a 47-to-1 vote last May.

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The Obama Foundation, a private nonprofit, would pay $10 to the city for use of the park land for 99 years, cover the costs of building the complex and be responsible for covering operating costs for 99 years. Once built, the Obama Presidential Center’s physical structures would be transferred to the city for free, meaning the city would formally own the center but not control what happens there.

“They are essentially giving (property) to Obama ... for 10 cents a year for 99 years,” parks advocacy lawyer Mark Roth said Thursday.

In a friend-of-the-court brief , legal scholar Richard Epstein said public-trust doctrine places an extra burden on authorities to prove overwhelming public benefit when they offer the use of public parks to such well-connected figures as Obama, who remains hugely popular in the heavily Democratic city. Chicago Mayor Rahm Emanuel once served as Obama’s White House chief of staff.

The First Amendment claim struck from the suit by Judge Blakey cited tax money that would be spent to reconfigure roads and traffic. The suit argued taxpayers would thus subsidize any partisan political activity by Obama at the center.

City lawyers conceded Thursday that Chicago would pay an estimated $175 million to reconfigure roads to manage traffic around the center.

The lawsuit also claims that the center would interfere with migrating butterflies and birds.

City lawyers said Protect Our Parks misread the law, misrepresented how the approval process played out and exaggerated potential environmental disruptions.

The center would comprise 20 acres (8 hectares) of the 500-acre (202-hectare) park. Its centerpiece would be a 225-foot (69-meter) museum tower, surrounded by a cluster of smaller buildings, including a 300-seat auditorium.

City lawyers said it would bring a major economic boost to poor local minority communities. Backers estimate it would create 5,000 jobs during construction and over 2,500 permanent jobs. An estimated 760,000 people could visit each year.

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