(a) A city or county that has an internet website shall make a fee estimate tool that the public can use to calculate an estimate of fees and exactions for a proposed housing development project available on its internet website. A city or county may choose the format of the fee estimate tool.

1. (1) The fee estimate tool shall calculate an estimate of fees for a proposed housing development project, including, but not limited to, the following:

   1. (A) A fee or charge described in the Mitigation Fee Act (Chapter 5 (commencing with Section 66000), Chapter 6 (commencing with Section 66010), Chapter 7 (commencing with Section 66012), except Section 66013, Chapter 8 (commencing with Section 66016), and Chapter 9 (commencing with Section 66020)).
   2. (B) In-lieu fees for affordability requirements.
   3. (C) A construction excise tax.
   4. (D) In-lieu fees for a requirement that the housing development project provide public art.
   5. (E) In-lieu fees for dedications of parkland imposed pursuant to Section 66477.
   6. (F) A special tax levied on new housing units pursuant to the Mello-Roos Community Facilities Act of 1982 (Chapter 2.5 (commencing with Section 53311) of Part 1 of Division 2 of Title 5).
2. (2) A city or county shall not be responsible for the accuracy of the estimate provided by the fee estimate tool. A city or county may include a disclaimer regarding the accuracy of the estimate calculated on its internet website under this section.

(b)

1. (1) A city or county with a population of greater than 500,000 shall meet the requirements of this section on or before July 1, 2031.
2. (2) A city or county with a population of 500,000 or fewer shall meet the requirements of this section on or before July 1, 2032.

(c) For purposes of this section, the following definitions apply:

1. (1) “Affordability requirement” means a requirement imposed as a condition of a development of residential units, that the development include a certain percentage of the units affordable for rent or sale to households with incomes that do not exceed the limits for moderate-income, lower income, very low income, or extremely low income households specified in Sections 50079.5, 50093, 50105, and 50106 of the Health and Safety Code.

2. (2) “Housing development project” means a use consisting of any of the following:

   1. (A) Residential units only.
   2. (B) Mixed-use developments consisting of residential and nonresidential uses with at least two-thirds of the square footage designated for residential use.
   3. (C) Transitional housing or supportive housing.