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Step 3: NEW Reliance on nonvacant sites to accommodate more than 50 percent of the RHNA…

Housing Element Sites Inventory Guidebook (AB 1397) · 2026 edition · updated 2026-07-29 · California

Determine if more than 50 percent of the lower income RHNA is on nonvacant sites.

  • Calculate the sum of lower income RHNA capacity on vacant sites and other alternatives not related to capacity on nonvacant sites (e.g., accessory dwelling units, vacant sites to be rezoned (see Part E)).

  • Subtract that sum from the total lower income RHNA to get the amount of RHNA needed to be accommodated on nonvacant sites.

  • Determine if this number is greater than 50 percent of the RHNA.

Example calculation for a jurisdiction with a lower income RHNA of 500:

Adjustment Factor Number of units
Proposed Lower Income Project 50
Accessory Dwelling Unit Capacity (affordable to lower) 15
Capacity on Vacant Sites 100
Total Capacity (not related to non-vacant sites) 165
RHNA on Nonvacant sites 500-165=335
Percentage of Lower Income RHNA accommodated
on Nonvacant sites
335/500 = 77%

If Yes: Move to Step 3A

If No: Move to Step 4

Site Inventory Guidebook

Page 26

May 2020

Step 3A: If a housing element relies on nonvacant sites to accommodate 50 percent or more of its RHNA for lower income households, the nonvacant site’s existing use is presumed to impede additional residential development, unless the housing element describes findings based on substantial evidence that the use will likely be discontinued during the planning period. The housing element must include the following:

  • As part of the resolution adopting the housing elements, findings stating the uses on nonvacant sites identified in the inventory to accommodate the RHNA for lower income is likely to be discontinued during the planning period and the factors used to make that determination. This can be included in the body or in the recital section of the resolution.

Example: WHEREAS, based on <name factors here (e.g., expiring leases, dilapidated building conditions, etc.)>, the existing uses on the sites identified in the site inventory to accommodate the lower income RHNA are likely to be discontinued during the planning period, and therefore do not constitute an impediment to additional residential development during the period covered by the housing element.

  • The housing element should describe the findings and include a description of the substantial evidence they are based on.

In general, substantial evidence includes facts, reasonable assumptions predicated upon facts, and expert opinion supported by facts. An example of substantial evidence would be a nonvacant site with a grocery store and with a building lease expiring in a year, and evidence that the store has entered into a lease to relocate to another site subsequent to the lease expiring.

Examples of substantial evidence that an existing use will likely be discontinued in the current planning period include, but are not limited to:

  • The lease for the existing use expires early within the planning period,

  • The building is dilapidated, and the structure is likely to be removed, or a demolition permit has been issued for the existing uses,

  • There is a development agreement that exists to develop the site within the planning period,

  • The entity operating the existing use has agreed to move to another location early enough within the planning period to allow residential development within the planning period.

  • The property owner provides a letter stating its intention to develop the property with residences during the planning period.

If multiple sites make up a common existing use and the same factors affect each of the sites, the same findings can be used for each of the sites (e.g., an abandoned shopping mall with sites under common ownership that will not be restored to commercial use located in an area where there is recent residential development). The “substantial evidence” would indicate the existing use will not impede further residential development or that the existing use will be discontinued during the planning period. In this type of situation, use of the same findings for each of the multiple sites would be appropriate.

Site Inventory Guidebook

Page 27

May 2020

However, the same finding for multiple sites in a specific area may not be appropriate if their characteristics widely vary. For example, nonvacant sites with differing existing uses and lacking in common ownership, whether contiguous or located in the same general area, may not rely on a generalized analysis. While the sites may be located in an area with common economic issues, individual owners may not wish to sell their property or redevelop their site with residential uses. In addition, each site’s existing use, e.g., grocery store, retail shop, parking lot, and offices, may have lease agreements of different lengths of time or the owner may not wish to relocate or redevelop the site with a more intensive residential use. In this type of situation, use of the same findings for the multiple sites would not be appropriate.

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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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