The final site plan for the proposed Costco store in Pittsfield Township is set to be reviewed this week, marking the last step in the chain’s attempt to redevelop 17 acres along Ellsworth west of South State.

The site plan will go before the Pittsfield Township Planning Commission on Thursday at 6:30 p.m.

An artist's rendering shows the proposed store in Pittsfield Township. File photo | AnnArbor.com

If the final site plan is approved, construction can begin on the site and the store could be open by spring 2012, Pittsfield Township Supervisor Mandy Grewal said.

The plans for the warehouse chain include building a 148,000-square-foot store with 720 parking spaces and a fuel center.

Plans for the store were first proposed in April 2010, 4 years after Costco pulled out of a deal to build its first Washtenaw County location in Scio Township. The chain withdrew the proposal after a large group of Scio residents raised concerns about the development.

Grewal said it has been a “slow, deliberate process,” to bring Costco to Pittsfield Township, but she said feedback on the development has been positive throughout the last year.

Costco is the largest membership warehouse chain in the United States with headquarters in Issaquah, Wa. The chain's closest stores are located in Brighton, Livonia and Commerce Township.

Lizzy Alfs is a business reporter for AnnArbor.com. Reach her at 734-623-2584 or email her at lizzyalfs@annarbor.com. Follow her on Twitter at http://twitter.com/lizzyalfs.