Creates the COVID-19 Affordable Housing Grant Program Act. Provides that the Illinois Housing Development Authority shall establish an affordable housing grant program to encourage the construction and rehabilitation of affordable multifamily rental housing in response to the COVID-19 pandemic. Contains provisions concerning financing. Amends the Illinois Procurement Code. Provides that the Code does not apply to certain contracts entered into by the Illinois Housing Development Authority. Amends the Illinois Housing Development Act. Makes changes concerning bonds and notes issued by the Illinois Housing Development Authority. Provides that the Illinois Housing Development Authority shall not have outstanding at any one time bonds and notes for any of its corporate purposes in an aggregate principal amount exceeding $7,200,000,000 (rather than $3,600,000,000), excluding bonds and notes issued to refund outstanding bonds and notes. Provides that of the authorized aggregate principal amount of $7,200,000,000 (rather than $3,600,000,000), the amount of $150,000,000 shall be used for the specified purposes. Amends the Illinois Income Tax Act. Extends the tax credit for affordable housing donations until December 31, 2026. Amends the Illinois Housing Development Act. Provides that the amount of tax credits reserved by the administrative housing agency for an approved project under the affordable housing tax donation credit program is limited to $32,850,352 in State fiscal years 2022 and 2023 and shall be increased by 5% in each fiscal year thereafter. Amends the Property Tax Code. Makes changes concerning the valuation of low-income housing projects that qualify for the Low-Income Housing Tax Credit under Section 42 of the Internal Revenue Code. Provides for a reduction in assessed value for affordable rental housing construction or rehabilitation. Amends the Affordable Housing Planning and Appeal Act. Provides that, for the purposes of the Act, rent includes any required costs for parking, maintenance, or landlord-imposed fees. Provides that an affordable housing plan, or any revision thereof, shall not be adopted by a nonexempt local government until notice and opportunity for public hearing have first been afforded. Provides that any vacancies in the Housing Appeals Board shall be filled within 90 days of the vacancy. Makes other changes. Effective immediately.