Hellman died of complications from his treatment for leukemia, according to The Bay Citizen.

FORBES: Warren Hellman, San Francisco Private Equity Pioneer, Dies At 77

Tuesday Supervisor Mark Farrell introduced legislation to eliminate that provision, the Bay Citizen reported.

FORBES: Tax Break In Hand, Twitter To Stay In San Francisco

Hellman was also known for generous contributions to the San Francisco Free Clinic, the San Francisco Education Fund and The Bay Citizen.

FORBES: Warren Hellman, San Francisco Private Equity Pioneer, Dies At 77

According the Bay Citizen story, Zynga CEO Mark Pincus and CFO David Wehner told Mayor Edwin Lee that unless they get the tax break, they will turn their 270, 000 square foot office into a call center and move their corporate offices and programmers to the Valley.

FORBES: Zynga Threatens To Leave S.F. For The Valley Over Tax Issue

It is also an invaluable corporate citizen in the Tampa Bay, Fla.

FORBES: Magazine Article