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Form Based Codes

Housing Element Sites Inventory Guidebook (AB 1397) · 2026 edition · updated 2026-07-29 · 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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Contents — Housing Element Sites Inventory Guidebook (AB 1397)
Housing Element Sites Inventory Guidebook (AB 1397)
  1. SUBJECT: Housing Element Site Inventory Guidebook Government C…
  2. Housing Element Site Inventory Requirements
  3. SITE INVENTORY GUIDEBOOK FRAMEWORK
  4. PART A: IDENTIFICATION OF SITES
  5. PART B: SITES TO ACCOMMODATE LOW AND VERY LOW- INCOME RHNA
  6. PART C: CAPACITY ANALYSIS
  7. PART D: NONVACANT SITES
  8. PART E: DETERMINATION OF ADEQUATE SITES
  9. Step 1: Identification of Developable Sites Government Code se…
  10. Government Code section 65583.2(b)
  11. Step 3: Infrastructure Availability Government Code section 65…
  12. Step 4: Map of Sites
  13. Step 5: Determination of Consistency with Affirmatively Furthe…
  14. Government Code section 65583.2(c)
  15. HCD Best Practices for selecting sites to accommodate the lowe…
  16. Step 7: Environmental Constraints
  17. NEXT STEP:
  18. Step 1: NEW Sites Used in Previous Planning Periods Housing El…
  19. Unusual Circumstances
  20. Step 1B:
  21. Definition of Use By Right (Government Code section 65583.2 (i))
  22. Sample Program:
  23. Government Code section 65583.2(c)(3)
  24. Housing Overlays
  25. Step 3: Size of Sites
  26. Definition of a Large Site
  27. Specific Plans, Master Plan, and other Subdivisions
  28. NEXT STEP:
  29. Step1: Utilizing minimum densities to calculate realistic capa…
  30. Government Code section 65583.2(c)(2)
  31. - Applicable land use controls and site improvement requirements
  32. Form Based Codes
  33. Typical densities of existing or approved residential developm…
  34. No Net Loss Law
  35. NEXT STEP:
  36. Definition of a Vacant Site
  37. Step 1: Description of the nonvacant site Government Code Sect…
  38. Government Code section 65583.2(g)(1)
  39. Existing Uses:
  40. Development Trends:
  41. Market Conditions:
  42. Availability of Regulatory and/or other Incentives:
  43. Step 3: NEW Reliance on nonvacant sites to accommodate more th…
  44. Step 4: NEW Program and policy requiring replacement of existi…
  45. Program X: Replacement Unit Program
  46. Funding: General Funds
  47. NEXT STEP:
  48. Government Code section 65583.1
  49. Impact of New Accessory Dwelling Unit Laws
  50. Step 2: Determine whether there is sufficient capacity to acco…
  51. Step 3: Adequate Sites Program
  52. General Program Requirements
  53. Timing
  54. Consequences for Failing to Complete Rezoning Deadline:
  55. Housing Accountability Act and the Housing Element
  56. Annexation
  57. Common Program Questions and Answers for Shortfall Zoning:
  58. ATTACHMENT 1: SUMMARY OF NEW LAWS REFERENCED IN THE GUIDEBOOK
  59. ATTACHMENT 2: GOVERNMENT CODE SECTION 65583.2

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