State officials agreed Wednesday to extend the bidding deadline for the Baltimore slots license by nearly two months, a move that delays the selection process until after the city's contested mayoral primary in September.

The vote by the Maryland slots commission came hours after Mayor Stephanie Rawlings-Blake unveiled a proposal to use revenue from the planned casino to reduce property taxes for city homeowners. A spokesman for Rawlings-Blake said the delay should not affect the proposal.

Commission members said pushing back the deadline would give its staff more time to answer technical and legal questions from developers who are considering bidding on the license.

Donald C. Fry, chairman of the slots commission, said there is a "strong showing" of "very interested parties."

"There have been very meaningful questions raised, and we have to be able to give meaningful answers," Fry said. "We just think this delay will do nothing but improve the chances of receiving qualified bids."

The decision to move the deadline from July 28 to Sept. 23 is the most recent twist in a long and so far fruitless search for a developer to run a slots casino in Baltimore.

Officials had hoped the slots parlor would open — and begin pumping revenue into city and state coffers — this year. Authorized for 3,750 machines, it would be the second-largest of the five casinos approved by Maryland voters in 2008.

But the first round of bidding for the license two years ago yielded one applicant.

Canadian homebuilder Michael Moldenhauer proposed a 500-machine slots casino for the site on Russell Street near the sports stadiums. Officials rejected his application after losing faith that his group could come up with the cash to back a larger facility. He has sued the city and the state.

The later deadline could benefit Rawlings-Blake, who faces several challengers in the Democratic mayoral primary Sept. 13. Analysts say it will help her avoid political embarrassment during the campaign in the event that no developer comes forward with a viable bid.

"The biggest issue she has to deal with is governance," said Lester Spence, a political scientist at the Johns Hopkins University. "If there were no bids, or if they were all really bad, it could be part of a broader strategy to say, 'We have somebody in the mayor's office who doesn't have the qualifications to be there.'"

Earlier Wednesday, Rawlings-Blake announced plans to use casino revenue to cut property taxes for city homeowners by 9 percent over nine years.

Spokesman Ryan O'Doherty said the delay should not have any "significant impact" on the mayor's plan to reduce the property tax rate, noting that her proposal does not rely on slots revenue in the first year.

"We are very confident that the Baltimore slots site will be successful and generate revenue to reduce property taxes in future years," O'Doherty wrote in an email.

Fry said the mayoral race was not a consideration in the decision to push the bid deadline back.

"This is a state issue," the commission chairman said. "Our primary interest is what is in the best interest of the state."

Robert Howells of the State Lottery Agency said potential bidders for the Baltimore slots license have submitted about 70 written questions. He characterized the inquiries as "very technical" and "very thoughtful," and said the answers yield new questions.

"It is difficult to cut off questions," Howells said.

Fry said the two-month extension would likely have little impact on the opening date for a casino and that he remains optimistic that the panel will award a license by early next year.