(a) The “full cash value” means the county assessor’s valuation of real property as shown on the 1975–76 tax bill under “full cash value” or, thereafter, the appraised value of real property when purchased, newly constructed, or a change in ownership has occurred after the 1975 assessment. All real property not already assessed up to the 1975–76 full cash value may be reassessed to reflect that valuation. For purposes of this section, “newly constructed” does not include real property that is reconstructed after a disaster, as declared by the Governor, where the fair market value of the real property, as reconstructed, is comparable to its fair market value prior to the disaster. For purposes of this section, the term “newly constructed” does not include that portion of an existing structure that consists of the construction or reconstruction of seismic retrofitting components, as defined by the Legislature.

However, the Legislature may provide that, under appropriate circumstances and pursuant to definitions and procedures established by the Legislature, any person over the age of 55 years who resides in property that is eligible for the homeowner’s exemption under subdivision (k) of Section 3 of Article XIII and any implementing legislation may transfer the base year value of the property entitled to exemption, with the adjustments authorized by subdivision (b), to any replacement dwelling of equal or lesser value located within the same county and purchased or newly constructed by that person as his or her principal residence within two years of the sale of the original property. For purposes of this section, “any person over the age of 55 years” includes a married couple one member of which is over the age of 55 years. For purposes of this section, “replacement dwelling” means a building, structure, or other shelter constituting a place of abode, whether real property or personal property, and any land on which it may be situated. For purposes of this section, a two-dwelling unit shall be considered as two separate single-family dwellings. This paragraph shall apply to any replacement dwelling that was purchased or newly constructed on or after November 5, 1986.

In addition, the Legislature may authorize each county board of supervisors, after consultation with the local affected agencies within the county’s boundaries, to adopt an ordinance making the provisions of this subdivision relating to transfer of base year value also applicable to situations in which the replacement dwellings are located in that county and the original properties are located in another county within this State. For purposes of this paragraph, “local affected agency” means any city, special district, school district, or community college district that receives an annual property tax revenue allocation. This paragraph applies to any replacement dwelling that was purchased or newly constructed on or after the date the county adopted the provisions of this subdivision relating to transfer of base year value, but does not apply to any replacement dwelling that was purchased or newly constructed before November 9, 1988.

The Legislature may extend the provisions of this subdivision relating to the transfer of base year values from original properties to replacement dwellings of homeowners over the age of 55 years to severely disabled homeowners, but only with respect to those replacement dwellings purchased or newly constructed on or after the effective date of this paragraph.

(c) For purposes of subdivision (a), the Legislature may provide that the term “newly constructed” does not include any of the following:

1. (1) The construction or addition of any active solar energy system.
2. (2) The construction or installation of any fire sprinkler system, other fire extinguishing system, fire detection system, or fire-related egress improvement, as defined by the Legislature, that is constructed or installed after the effective date of this paragraph.
3. (3) The construction, installation, or modification on or after the effective date of this paragraph of any portion or structural component of a single- or multiple-family dwelling that is eligible for the homeowner’s exemption if the construction, installation, or modification is for the purpose of making the dwelling more accessible to a severely disabled person.
4. (4) The construction, installation, removal, or modification on or after the effective date of this paragraph of any portion or structural component of an existing building or structure if the construction, installation, removal, or modification is for the purpose of making the building more accessible to, or more usable by, a disabled person.
5. (5) The construction or addition, completed on or after January 1, 2019, of a rain water capture system, as defined by the Legislature.

(e)

1. (1) Notwithstanding any other provision of this section, the Legislature shall provide that the base year value of property that is substantially damaged or destroyed by a disaster, as declared by the Governor, may be transferred to comparable property within the same county that is acquired or newly constructed as a replacement for the substantially damaged or destroyed property.
2. (2) Except as provided in paragraph (3), this subdivision applies to any comparable replacement property acquired or newly constructed on or after July 1, 1985, and to the determination of base year values for the 1985–86 fiscal year and fiscal years thereafter.
3. (3) In addition to the transfer of base year value of property within the same county that is permitted by paragraph (1), the Legislature may authorize each county board of supervisors to adopt, after consultation with affected local agencies within the county, an ordinance allowing the transfer of the base year value of property that is located within another county in the State and is substantially damaged or destroyed by a disaster, as declared by the Governor, to comparable replacement property of equal or lesser value that is located within the adopting county and is acquired or newly constructed within three years of the substantial damage or destruction of the original property as a replacement for that property. The scope and amount of the benefit provided to a property owner by the transfer of base year value of property pursuant to this paragraph shall not exceed the scope and amount of the benefit provided to a property owner by the transfer of base year value of property pursuant to subdivision (a). For purposes of this paragraph, “affected local agency” means any city, special district, school district, or community college district that receives an annual allocation of ad valorem property tax revenues. This paragraph applies to any comparable replacement property that is acquired or newly constructed as a replacement for property substantially damaged or destroyed by a disaster, as declared by the Governor, occurring on or after October 20, 1991, and to the determination of base year values for the 1991–92 fiscal year and fiscal years thereafter.

(f) For the purposes of subdivision (e):

1. (1) Property is substantially damaged or destroyed if it sustains physical damage amounting to more than 50 percent of its value immediately before the disaster. Damage includes a diminution in the value of property as a result of restricted access caused by the disaster.
2. (2) Replacement property is comparable to the property substantially damaged or destroyed if it is similar in size, utility, and function to the property that it replaces, and if the fair market value of the acquired property is comparable to the fair market value of the replaced property prior to the disaster.

(g) For purposes of subdivision (a), the terms “purchased” and “change in ownership” do not include the purchase or transfer of real property between spouses since March 1, 1975, including, but not limited to, all of the following:

1. (1) Transfers to a trustee for the beneficial use of a spouse, or the surviving spouse of a deceased transferor, or by a trustee of such a trust to the spouse of the trustor.
2. (2) Transfers to a spouse that take effect upon the death of a spouse.
3. (3) Transfers to a spouse or former spouse in connection with a property settlement agreement or decree of dissolution of a marriage or legal separation.
4. (4) The creation, transfer, or termination, solely between spouses, of any coowner’s interest.
5. (5) The distribution of a legal entity’s property to a spouse or former spouse in exchange for the interest of the spouse in the legal entity in connection with a property settlement agreement or a decree of dissolution of a marriage or legal separation.

(h)

1. (1) For purposes of subdivision (a), the terms “purchased” and “change in ownership” do not include the purchase or transfer of the principal residence of the transferor in the case of a purchase or transfer between parents and their children, as defined by the Legislature, and the purchase or transfer of the first one million dollars ($1,000,000) of the full cash value of all other real property between parents and their children, as defined by the Legislature. This subdivision applies to both voluntary transfers and transfers resulting from a court order or judicial decree.

2. (2)

   1. (A) Subject to subparagraph (B), commencing with purchases or transfers that occur on or after the date upon which the measure adding this paragraph becomes effective, the exclusion established by paragraph (1) also applies to a purchase or transfer of real property between grandparents and their grandchild or grandchildren, as defined by the Legislature, that otherwise qualifies under paragraph (1), if all of the parents of that grandchild or those grandchildren, who qualify as the children of the grandparents, are deceased as of the date of the purchase or transfer.
   2. (B) A purchase or transfer of a principal residence shall not be excluded pursuant to subparagraph (A) if the transferee grandchild or grandchildren also received a principal residence, or interest therein, through another purchase or transfer that was excludable pursuant to paragraph (1). The full cash value of any real property, other than a principal residence, that was transferred to the grandchild or grandchildren pursuant to a purchase or transfer that was excludable pursuant to paragraph (1), and the full cash value of a principal residence that fails to qualify for exclusion as a result of the preceding sentence, shall be included in applying, for purposes of subparagraph (A), the one-million-dollar ($1,000,000) full cash value limit specified in paragraph (1).

(i)

1. (1) Notwithstanding any other provision of this section, the Legislature shall provide with respect to a qualified contaminated property, as defined in paragraph (2), that either, but not both, of the following apply:

   1. (A)

      1. (i) Subject to the limitation of clause (ii), the base year value of the qualified contaminated property, as adjusted as authorized by subdivision (b), may be transferred to a replacement property that is acquired or newly constructed as a replacement for the qualified contaminated property, if the replacement real property has a fair market value that is equal to or less than the fair market value of the qualified contaminated property if that property were not contaminated and, except as otherwise provided by this clause, is located within the same county. The base year value of the qualified contaminated property may be transferred to a replacement real property located within another county if the board of supervisors of that other county has, after consultation with the affected local agencies within that county, adopted a resolution authorizing an intercounty transfer of base year value as so described.
      2. (ii) This subparagraph applies only to replacement property that is acquired or newly constructed within five years after ownership in the qualified contaminated property is sold or otherwise transferred.
   2. (B) In the case in which the remediation of the environmental problems on the qualified contaminated property requires the destruction of, or results in substantial damage to, a structure located on that property, the term “new construction” does not include the repair of a substantially damaged structure, or the construction of a structure replacing a destroyed structure on the qualified contaminated property, performed after the remediation of the environmental problems on that property, provided that the repaired or replacement structure is similar in size, utility, and function to the original structure.

2. (2) For purposes of this subdivision, “qualified contaminated property” means residential or nonresidential real property that is all of the following:

   1. (A) In the case of residential real property, rendered uninhabitable, and in the case of nonresidential real property, rendered unusable, as the result of either environmental problems, in the nature of and including, but not limited to, the presence of toxic or hazardous materials, or the remediation of those environmental problems, except where the existence of the environmental problems was known to the owner, or to a related individual or entity as described in paragraph (3), at the time the real property was acquired or constructed. For purposes of this subparagraph, residential real property is “uninhabitable” if that property, as a result of health hazards caused by or associated with the environmental problems, is unfit for human habitation, and nonresidential real property is “unusable” if that property, as a result of health hazards caused by or associated with the environmental problems, is unhealthy and unsuitable for occupancy.
   2. (B) Located on a site that has been designated as a toxic or environmental hazard or as an environmental cleanup site by an agency of the State of California or the federal government.
   3. (C) Real property that contains a structure or structures thereon prior to the completion of environmental cleanup activities, and that structure or structures are substantially damaged or destroyed as a result of those environmental cleanup activities.
   4. (D) Stipulated by the lead governmental agency, with respect to the environmental problems or environmental cleanup of the real property, not to have been rendered uninhabitable or unusable, as applicable, as described in subparagraph (A), by any act or omission in which an owner of that real property participated or acquiesced.

3. (3) It shall be rebuttably presumed that an owner of the real property participated or acquiesced in any act or omission that rendered the real property uninhabitable or unusable, as applicable, if that owner is related to any individual or entity that committed that act or omission in any of the following ways:

   1. (A) Is a spouse, parent, child, grandparent, grandchild, or sibling of that individual.
   2. (B) Is a corporate parent, subsidiary, or affiliate of that entity.
   3. (C) Is an owner of, or has control of, that entity.

   4. (D) Is owned or controlled by that entity.

      If this presumption is not overcome, the owner shall not receive the relief provided for in subparagraph (A) or (B) of paragraph (1). The presumption may be overcome by presentation of satisfactory evidence to the assessor, who shall not be bound by the findings of the lead governmental agency in determining whether the presumption has been overcome.

4. (4) This subdivision applies only to replacement property that is acquired or constructed on or after January 1, 1995, and to property repairs performed on or after that date.