Amends the Property Tax Code. In a Section granting a homestead exemption to veterans with disabilities, provides that property that is used as a qualified residence by a veteran who was a member of the United States Armed Forces during World War II is exempt from taxation regardless of the veteran's level of disability. Provides that a veteran who qualifies as a result of his or her service in World War II need not reapply for the exemption. Makes changes concerning service-connected disabilities. Makes changes concerning surviving spouses. Creates a homestead exemption for surviving spouses of fallen police officers and fallen rescue workers in an amount equal to 50% of the equalized assessed value of the property. Makes changes concerning the valuation of wastewater facilities. In provisions concerning the Historic Residence Assessment Freeze Law, provides that the fair cash value of the property shall be based on the final determination by the assessment officer, board of review, Property Tax Appeal Board, or court. Provides that, after the expiration of the 8-year valuation period, if the current fair cash value is less than the adjusted base year valuation, then the assessment shall be based on the current fair cash value. Makes changes concerning multi-township assessors. Provides that property that is used for a petroleum refinery may be the subject of a real property tax assessment settlement agreement among the taxpayer and taxing districts in which the property is situated. Amends the Park District Aquarium and Museum Act. Changes the Act's short title to the Park District and Municipal Aquarium and Museum Act. Replaces the Act's existing references to "city" and "cities" with "municipality" and "municipalities". Provides that the board of park commissioners or corporate authorities of a municipality (currently, only boards of park commissioners) may levy a tax if the park district or municipality has control of a public park or parks within the park district or municipality in which an aquarium or museum is maintained. Amends the Property Tax Extension Limitation Law of the Property Tax Code. Provides that extensions for levies made under the Park District and Municipal Aquarium and Museum Act are special purpose extensions and are not included in the park district's or municipality's aggregate extension. Creates an exemption for municipality-built homes. Provides that real property that is used to provide services requiring a license under the Nursing Home Care Act or under the Specialized Mental Health Facilities Act shall not be assessed at a higher level of assessment than residential property in the county in which the nursing home or mental health services facility is located. Effective immediately.