OAKLAND — The Alameda County Board of Supervisors said it has formally moved to negotiate the sale of its share of the Oakland-Alameda County Coliseum complex to the city of Oakland, board members said Tuesday.

Citing the Oakland As’ recent statements expressing interest in purchasing the Coliseum site outright, the board said after a Tuesday morning conference with property negotiatiors that any plan to make the sale and any on-site development requires a single owner.

“Since the City of Oakland ultimately controls land use related to the Coliseum properties, Alameda County believes the best way to accomplish this is for the County to sell its ownership interest in the Coliseum complex to the City,” a board statement released Tuesday evening said.

“This would enable the City to negotiate a single exclusive negotiating agreement (ENA) with the Oakland A’s for the Coliseum properties.”

The board, noting the turmoil over joint ownership that has led all three professional sports teams that currently call the complex home to leave or consider pulling up stakes, described the property as “the Oakland Raiders’ Alameda properties and the Coliseum complex – defined as the parcel containing the Coliseum and Oracle Arena, as well as an adjacent parking lot known as the ‘Malibu site.'”

It also struck an optimistic note, citing the site’s proximity to Interstate 880 and BART.

“Negotiating the sale of the County’s share will enhance the City’s abilities to pursue its vision for substantial new development at the Coliseum site as expressed in its Coliseum Plan and facilitate retention of the Oakland A’s,” the statement said.

Late last month, Oakland Mayor Libby Schaaf asked local leaders to back a pact to give the Athletics exclusive rights to negotiate stadium deals at the Coliseum and Howard Terminal, another possible site.

The mayor passed up an eleventh-hour proposal from an East Bay sports team owner to develop the site, signing an agreement with the A’s that still requires approved by the Oakland City Council, and from the Port of Oakland commissioners for the Howard Terminal agreement.

Contact George Kelly at 408-859-5180.