CA AB831

Allows development proponents to request modifications to streamlined multifamily housing developments before final building permit issuance, with local governments required to approve or deny within 60-90 days if modifications remain consistent with original objective planning standards.

Requires local governments to evaluate development modifications using the same assumptions and methodology applied to the original approval, and prohibits application of newly-adopted planning standards except when project size changes by 15% or more or when necessary to mitigate specific public health/safety impacts.

Specifies that encroachment permits are included in "subsequent permits" that local governments must issue without unreasonable delay for approved streamlined developments.

Prohibits local governments from exercising discretion over public improvements located on government-owned land in ways that would inhibit or preclude development, and requires public improvement applications be reviewed under objective standards in effect when original development application was submitted.

Requires local governments to conduct Native American scoping consultations before accepting streamlined approval applications, with projects becoming ineligible if tribal cultural resources could be affected without documented enforceable agreement on mitigation measures.