A regional transportation agency that may have violated open meeting laws when it voted to leave its longtime Oakland home and relocate to San Francisco will meet Wednesday for a special do-over of its July 27 decision.

The special meeting of the Metropolitan Transportation Commission was called after Oakland City Attorney Barbara Parker notified the agency and the Association of Bay Area Governments that a closed-session meeting on July 27 attended by members of both agencies' boards violated the state Brown Act.

The extra meeting is the latest hiccup in MTC's efforts to create a regional government hub in San Francisco.

Several East Bay officials have raised questions about the $180 million San Francisco real estate deal approved by the MTC board and the Bay Area Toll Authority on July 27.

State Sen. Mark DeSaulnier, D-Concord, has called for a Senate hearing and audit of the deal because he questions the use of state bridge toll money to buy and rehabilitate the San Francisco building at 390 Main St. for a regional government headquarters for MTC, the Bay Area Air Quality Management District, and possibly the Association of Bay Area Governments and Bay Conservation and Development Commission. There is also some dissension among the agencies. The air district board, which is located in San Francisco, voted for it. But the board of ABAG, which shares a building with MTC at 101 Eighth St. in Oakland, voted against the relocation.

Oakland City Councilmember Rebecca Kaplan (At-large), who is also a member of the ABAG board, questioned the methodology used by MTC staff to compare the feasibility of 390 Main St. to new construction at 1100 Broadway in Oakland.

CB Richard Ellis developed a list of suitable sites in San Francisco and Oakland that met certain criteria, such as size, location, environmentally friendly construction and proximity to BART.

In the end, the Main Street building was considered the best choice by the consultants and MTC staff.

According to information provided to the agencies before they voted to approve the San Francisco building, new construction at the 1100 Broadway site was considered too expensive per square foot and would not provide as high a rate of return on commercial leases as the 390 Main St. site.

But Kaplan and the 1100 Broadway developer said different financing criteria was used to compare the two sites, and the analysis should be redone.

Wednesday's meeting will start at 9 a.m. at MTC headquarters, 101 Eighth St., Oakland.

Contact Cecily Burt at 510 208-6441. Follow her on Twitter.com/csburt.