Peter Pfendler was scorned by some for his 10-year battle against opening Lafferty Ranch near Petaluma to the public, and hailed by others for his philanthropy and environmentalism.
The 63-year-old cattle rancher died Sunday at his Sonoma Mountain home of bone marrow cancer, said his brother, David Pfendler of McMinnville, Ore.
He is survived by his wife, Kimberly, and their 2 1/2-year-old son, Nicholas.
Funeral services will be private, his brother said.
"He was a good guy who gave a lot back to the community," said Sonoma County Supervisor Mike Kerns, who adjourned the Tuesday board meeting in his memory. "It's a sad thing."
Pfendler was perhaps best known for his fight against a proposed park at Lafferty Ranch, a 269-acre tract near the top of Sonoma Mountain owned by the city of Petaluma.
The issue of public access came to a head in 1992, when the city decided against selling the property to Pfendler, who made a bid to buy it.
Pfendler, whose property borders Lafferty Ranch, was the most visible of a group of Sonoma Mountain landowners who opposed proposals to open the ranch to the public.
As a bargaining chip, he bought the 380-acre Moon Ranch lower on Sonoma Mountain and offered to swap the land for Lafferty.
The deal fell apart in 1996 and triggered a battle over access to Lafferty Ranch that raged until 2002, when the city decided it didn't have the resources to continue fighting.