San Francisco is suing the owner and property manager of two Bayview warehouses that were illegally operating as cannabis grow houses, the city announced Thursday. The warehouse tenants had been cultivating nearly 6,000 marijuana plants without a license in violation of city and state laws, according to City Attorney David Chiu. The city alleges that the property manager David Chi-Yu Lai was aware of the operations and profited from leasing the warehouses for the illegal activity.