For Tenants-in-Common (TIC's), Condominium and Other Small Property Owners
Real Estate Information
Socketsite is probably the best real estate blog in the City of San Francisco.
Tax Information for TIC Properties
Tax info and your tax bill are available with the office of the Treasurer and Tax Collector for the City of San Francisco.
Tenants Rights and Housing Issues
While I may not agree with their positions, if there is pending legislation related to tenants' rights, condo conversions or other housing issues the San Francisco's Tenant's Union and BeyondChron.org are on top of the current events and are a great resource for TIC information. These are great places to get informed about Land Use Committee and Board of Supervisors hearings concerning new legislation.