This week's court decision is the latest development in Walmart's years-long effort to expand its Antioch store into the East Bay's first Supercenter.

Here is a timeline:

January 2000 -- Walmart opens 134,000-square-foot store at Lone Tree Way and Hillcrest Avenue.

June 2004 -- Walmart announces intention to expand store by 72,980 square feet into a 24-hour Supercenter; city says it must study traffic and noise effects.

Sept. 20, 2006 -- Planning Commission approves environmental study; appeal is filed.

October 2006 -- City Council hears arguments for and against expansion, and delays decision.

February 2007 -- City Council rejects Walmart's plans for 64,980-square-foot expansion.

January 2010 -- Walmart submits new plans to Antioch, calling for 33,575-square-foot expansion and no 24-hour operations; city says it must study environmental effects.

May 2010 -- Planning Commission approves Walmart expansion plans; decision is appealed to City Council.

July 2010 -- City Council rejects Walmart expansion, citing economic concerns.

August 2010 -- Proposal brought back to council after city legal counsel determines that environmental review is not needed for expansion.

Sept. 28, 2010 -- City Council approves Walmart expansion

October 2010 -- Walmart opponents file lawsuit over city decision.

Oct. 13, 2011 -- Contra Costa Superior Court sides with Walmart opponents, effectively reversing city

January 2012 -- Walmart files appeal with state Court of Appeals.

Nov. 27, 2012 -- Appellate court reverses Contra Costa Superior Court ruling, allowing Walmart expansion to proceed.

Contact Paul Burgarino at 925-779-7164. Follow him at Twitter.com/paulburgarino.