OAKLAND — Peralta Colleges has hired a union heavyweight and former Oakland deputy mayor as its chief strategist on the Oakland A’s proposal to build a new ballpark at district headquarters.

District Chancellor Jowel Laguerre announced the hiring of consultant Sharon Cornu at Tuesday’s Board of Trustees meeting, which was the first time the board met since A’s President Dave Kaval sent them a letter announcing the team preferred to build at E. 8th Street and Fifth Avenue.

In Cornu, the college district is getting a consultant who worked in City Hall for former Mayor Jean Quan and has experience negotiating major land deals during her years as executive secretary-treasurer of the Alameda Labor Council.

Cornu worked on community benefits negotiations for the A’s failed attempt to move to Fremont in 2006 and the massive Oakland Army Base project. She has also worked as a political consultant.

Cornu has hit the ground running. In a presentation at Tuesday’s trustee meeting, she laid out the steps of what will be a complicated proposal for the ballpark, should it go forward, to include the impacts on education at nearby Laney College, the neighborhoods of Chinatown and Eastlake, and traffic.

More than 100 A’s fans and team employees attended the meeting in a show of support for the Peralta stadium dream.

The Peralta board’s closed-session meeting on Tuesday listed the possible land deal as including district headquarters and a large parking lot across the Lake Merritt channel used by Laney College students and faculty.

Cornu expects to present a report on potential community benefits at the board’s December meeting.

“Oakland and the East Bay really have led the way in thinking about the impact of development on communities,” she said Friday. “We need to bring that experience and a high level of expectation to this process so we have strong community engagement, a clear understanding of the impacts and have prepared to deal not just with mitigation but with reparation.”

Last month, Kaval said the team intents to spend the next year on a listening tour of how the proposed 35,000-seat stadium can be built at the site with as little impact as possible. The A’s selected the Peralta as their preferred location over the Coliseum and Howard Terminal.

In a statement, Laguerre said, “we intend to work closely with our students, staff, faculty, neighbors and stakeholders within our shared governance framework to ensure that any proposal strengthens the community.”

Cornu’s contract specifies the cost for her consulting services should not exceed $25,000.