Between 2015 and 2023, Ken Mattson amassed a huge real estate portfolio in and around the city of Sonoma, snapping up one parcel after another until he owned all or part of at least 116 properties.
PLEASANTON — Sheryl Lawless spent months in 2023 chasing Kenneth Mattson around. The Sonoma-based businessman, she says, owed her $25,000 for selling her father’s prized possession — a 1971 Datsun ...