Exemption from tax equal to corporate franchise taxes paid. If a transfer of a controlling interest in a real estate entity is taxed under this Article and the real estate entity liable for the tax under this Article is also liable for corporate franchise taxes under the Business Corporation Act of 1983 as a result of the transfer, then the real estate entity is exempt from paying the tax imposed under this Article to the extent of the corporate franchise tax paid by the real estate entity as a result of the transfer. The exemption shall not reduce the real estate entity’s tax liability under this Article to less than zero.