The couple, who have three children nine-year-old Violet, six-year-old Seraphina, and three-year-old Samuel together, announced their split in a joint statement.
They marked their 10th anniversary early this week.
Affleck, 42, who has been staying in hotels in recent months, will live on the property of their Brentwood marital home, but will not share the main house, sources said.
Affleck and Garner, 43, are using a mediator to work out the divorce, reported the New York Post.
"This isn't going to end up in a dramatic court case, they are trying to resolve it as quickly and easily as possible.
The two will apparently share the custody of their daughters. "They plan to share custody and co-parent their kids," the insider said.
