Form Based Codes
Housing Element Sites Inventory Guidebook (AB 1397) · 2026 edition · updated 2026-09-22 · California
To estimate capacity for sites in jurisdictions that have adopted form-based codes, the element should describe the relationship between general plan land-use designation and the form-based code and density assumptions used to determine capacity. Specifically, describe where residential development is allowed, how density requirements found within the general plan are incorporated, how the zoning designations under the form-based code relate to the land-use designations of the general plan, identify potential densities, and consider development standards such as bulk, height, and build-to requirements, buildings types, and use requirements. The element could include examples of recently built projects and densities to support the analysis. End Form Base Codes
Realistic development capacity for nonresidential, nonvacant, or overlay zoned sites
The capacity calculation must be adjusted to reflect the realistic potential for residential development capacity on the sites in the inventory. Specifically, when the site has the potential to be developed with nonresidential uses, requires redevelopment, or has an overlay zone allowing the underlying zoning to be utilized for residential units, these capacity limits must be reflected in the housing element. Factors used to make this adjustment may include the following:
Performance standards mandating a specified portion of residential development in mixed use or nonresidential zones (e.g., residential allowed only above first floor commercial).
The likelihood for residential development such as incentives for residential use, market demand, efforts to attract and assist developers, or allowance of 100 percent residential development.
Local or regional residential development trends in the same nonresidential zoning districts.
Local or regional track records, past production trends, or net unit increases/yields for redeveloping sites or site intensification. This estimate may be based on the rate at which similar parcels were developed during the previous planning period, with
Site Inventory Guidebook
Page 20
May 2020
adjustments as appropriate to reflect new market conditions or changes in the regulatory environment. If no information about the rate of development of similar parcels is available, report the proportion of parcels in the previous housing element’s site inventory that were developed during the previous planning period. For example, if past production trends indicate that two out of three similar sites were developed for residential use, and one out of three similar sites was developed for commercial use, an initial estimate of the proportion of new development which is expected to be residential would be two-thirds, i.e., 0.67.
- Local or regional track records, trends, or build out yields for redeveloping sites or site intensification.
In addition, the housing element should include monitoring programs with next-step actions to ensure sites are achieving the anticipated development patterns. The programs should identify modifications to incentives, sites, programs, or rezoning the jurisdiction will take should these strategies not yield the expected housing potential.
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