Cal. Health & Safety Code § 33498.2
(b) Not less than 20 percent of all taxes that are allocated to the authority pursuant to Section 33670 shall be deposited into a separate Low and Moderate Income Housing Fund, which is hereby created in the State Treasury, to be administered and used by the authority for the purposes of increasing, improving, and preserving both of the following:
(d) In carrying out the purposes of this section, the authority may, solely within the boundaries of the site, exercise any or all of the following powers:
(2) Improve real property or building sites for the housing listed in subdivision (b) with onsite or offsite improvements, but only if the authority finds either of the following:
(e) The Legislature intends that the authority use the Low and Moderate Income Housing Fund to the maximum extent possible to defray the costs of production, improvement, and preservation of housing solely within the site, and that the amount of money spent for planning and general administrative activities associated with the development, improvement, and preservation of that housing not be disproportionate to the amount actually spent for the costs of production, improvement, and preservation of that housing. The authority shall annually determine that the planning and administrative expenses are necessary for the production, improvement, or preservation of housing on the site. Legal, architectural, and engineering costs and other salaries, wages, and costs directly related to the planning and execution of a specific housing project and which are incurred by a nonprofit housing sponsor are not “planning and administrative costs” for the purposes of this subdivision, but are instead project costs. Planning and general administrative costs which may be paid with moneys from the Low and Moderate Income Housing Fund are those expenses that the authority incurs that are directly related to the powers listed in subdivision (d), and are limited to the following:
(f) Housing that is produced, improved, or preserved with moneys from the Low and Moderate Income Housing Fund shall remain available for the longest period of time, as follows:
(2) The authority shall require that housing that is produced, improved, or preserved for persons and households of low or moderate income and persons and households of very low income be subject to covenants or restrictions filed in the office of the county recorder limiting the residency to those persons as follows:
(g) The authority shall spend or encumber all property tax revenues deposited into the Low and Moderate Income Housing Fund within five years from the end of the fiscal year in which the funds were deposited into the fund. If the authority fails to spend or encumber those revenues in a timely manner, and thereafter until the authority has expended or encumbered those revenues, the agency shall not receive any property tax revenue from any source except as necessary to pay the following obligations, if any: