Filner hasn't had any public events since returning to work this week following therapy for his behavior. He has acknowledged disrespecting and intimidating women but has denied any sexual harassment.
City Attorney Jan Goldsmith, who negotiated on the city's behalf, also has declined to comment about terms of the deal. Goldsmith previously presented the City Council with a resolution to not pay for Filner's defense and to countersue to distance the city from the scandal.
Steve Erie, a political science professor at the University of California, San Diego, said Filner's resignation obviously is part of the proposed resolution.
"He had to have Filner's scalp in order to compromise and handle Filner's fees," Erie said of Goldsmith.
Tony Krvaric, chairman of the San Diego County Republican Party, said voters may disapprove of the settlement if the city is stuck with high legal bills.
There's a middle ground where it's probably reasonable," he said. "We'll see who got the better of whom."
The sex scandal has plunged the city into political turmoil. A recall effort has started and organizers have gathered about 10 percent of the roughly 100,000 signatures needed to call an election. Meanwhile, women have continued coming forward and saying Filner made unwanted advances and inappropriate statements to them.
Dianne York, the latest of at least 17 accusers that include a great-grandmother and retired Navy rear admiral, said Filner placed his hand on her buttocks while she posed for a photo with him about three months ago. York said the incident took place after a meeting at his office. She said she reported it to the San Diego County Sheriff's Department.
McCormack Jackson was the first woman to go public with harassment allegations against Filner, a twice-divorced, 70-year-old former congressman who took office last December. She claimed the mayor asked her to work without panties, demanded kisses, told her he wanted to see her naked and dragged her in a headlock while whispering in her ear.
Other accusers contend he cornered, groped and forcibly kissed them.Should Filner resign, City Council President Todd Gloria would become acting mayor until a special election is held. Gloria and Councilman Kevin Faulconer were among those at the settlement talks.