CA AB1174

Clarifies that streamlined, ministerial approval for multifamily housing developments remains valid indefinitely only if the project includes public investment in housing affordability beyond tax credits and at least 50 percent of units are affordable to households at or below 80 percent of area median income.

Provides alternative validity period of 3 years from the date of final judgment if litigation challenges the development's approval, with ongoing validity as long as construction has begun and is in progress.

Extends the approval validity period when a development proponent requests modifications, with the extension lasting until the number of days between modification submittal and final approval plus an additional 180 days.

Specifies that objective building standards from the California Building Standards Code may be applied to all modification applications submitted before the first building permit, and to later applications only if the development proponent agrees.

Requires local governments to evaluate subsequent permit applications based on objective standards that were in effect when the original development application was submitted, unless the development proponent agrees to apply newer standards.