Rev. & Tax. Code, § 20627

A tenant-stockholder claimant (hereinafter referred to as “claimant”) is an individual who, on the last day of the calendar year ending immediately prior to the commencement of the fiscal year for which postponement is claimed is: (a) a tenant-stockholder in a cooperative housing corporation (as defined in Section 216(b) of the Internal Revenue Code) and (b) occupies, as a principal place of residence, a residential unit in the cooperative housing corporation (notwithstanding Section 216(b) of the Internal Revenue Code). For the purposes of this chapter, a claimant must be (1) 62 years of age or older on or before December 31 of the fiscal year for which postponement is claimed or (2) blind or disabled, as defined in Section 12050 of the Welfare and Institutions Code, at the time of application or on February 10 of the fiscal year for which the postponement is claimed.