CA SB9

Allows ministerial approval (without discretionary review) of housing developments with up to 2 residential units in single-family residential zones located in urbanized areas, subject to specific requirements including restrictions on demolishing affordable housing and historic properties.

Requires local agencies to ministerially approve parcel maps for "urban lot splits" that divide a single parcel into 2 new parcels of approximately equal size in single-family residential zones, with owner occupancy affidavit requirement for 3 years unless applicant is a community land trust or qualified nonprofit.

Prohibits local agencies from imposing setback requirements on existing structures or structures built to same dimensions as existing ones; allows up to 4-foot setbacks in other circumstances.

Exempts projects approved under these ministerial processes from California Environmental Quality Act (CEQA) review and eliminates public hearing requirements for coastal development permits under these provisions.

Extends the maximum additional timeframe for tentative map expiration from 12 months to 24 months under the Subdivision Map Act.