Mayor Bloomberg and the speaker of the City Council, Christine Quinn, are launching an effort to rein in the influence of lobbyists at City Hall.

The five-part plan, which with the backing of both Ms. Quinn and Mr. Bloomberg appears likely to become law, would ban government officials from accepting gifts and meals from lobbyists. It would require lobbyists to disclose which public officials they have raised money and consulted for.

And it would prohibit public matching funds for campaign contributions made by lobbyists, their co-workers, and their immediate family members. That means that a $250 contribution from a lobbyist would remain a $250 contribution rather than growing to $1,250 at the lowest tier of the current matching program, which gives candidates $4 of taxpayer money for $1 that is privately raised.

Mr. Bloomberg, who has railed against so-called “pay-to-play” politics in the past and disclosed some of these reforms in his State of the City address last month, said the legislation would “shine a light on a practice that has mostly grown in the shadows.”

“We’re not waiting for the next Jack Abramoff to arrive,” Mr. Bloomberg said, referring to the Republican lobbyist in Washington who pleaded guilty last month to conspiring to bribe public officials.

“We’re taking proactive steps that other jurisdictions including Congress would be wise to follow,” Mr. Bloomberg said. He also added: “Every New Yorker knows there is no such thing as a free lunch.”

The legislation also mandates information on lobbyists be included in an online electronic database, aims to strengthen enforcement of lobbying rules, and doubles the maximum fine for violating the rules to $30,000.

In addition, Ms. Quinn vowed to ban lobbyists from the floor of the council chambers during full meetings and said she will have a key card system installed in her office to ensure that lobbyists cannot wander in without a prearranged appointment.

“It’s not appropriate for lobbyists to basically have unfettered access to the speaker’s office,” she said.

The announcement represents a major collaboration between the mayor and Ms. Quinn, who was elected as council speaker last month. Her predecessor, Gifford Miller, was campaigning against Mr. Bloomberg last year and the two rarely announced joint initiatives. Leaders at three advocacy groups – Citizens Union, the New York Public Interest Research Group, and Common Cause – praised the initiative as a first step in curtailing the influence of lobbyists.

The executive director of Citizens Union, Dick Dadey, said the legislation was more than just “window dressing” and that if enforced well, it would help decrease the influence of lobbyists on public officials. “One of the greatest abuses is that lobbyists can make a contribution of $250 and then turn around and have the public taxpayers give $1,000,”Mr.Dadey said. “Taxpayers are subsidizing the influence peddling of lobbyists, and that is wrong.”

Mr. Dadey said the collaboration between the Republican mayor and the Democratic council speaker shows that “there is no Republican or Democratic way to improve integrity of government.”

The senior attorney for the New York Public Interest Research Group, Gene Rusianoff, said that determining where lobbyists have yielded influence is too often like an “Easter-egg hunt.”

But those in the industry had a different take. One lobbyist, Richard Lipsky, who represents anti-Wal-Mart groups and union interests, said the proposed legislation overlooks the influence that companies have, particularly real estate firms, have.

“I don’t necessarily think that lobbyists are being unfairly targeted, what I’m saying is that by only targeting lobbyists it overlooks the essence of special interest politics and conflict of interest politics in this city, which is the power of real estate companies,” he said.

Mr. Lipsky said if the mayor wants more “integrity” in government, he should be stop awarding developers with connections to key members of his administration’s plum projects.

Mr. Bloomberg said there is a place for petitioning the government for change and for lobbying, but that these guidelines are badly needed. He and Ms. Quinn will also be sending a letter to the Conflicts of Interest Board, asking for an opinion on extending the ban on lobbying an agency after working there. The ban currently lasts a year after a person leaves government.