Authorizing the Mayor and City Council of Baltimore City or the governing body of a county to establish, by law, a subclass of real property consisting of improvements to real property located within 1 mile of a rail station and to set a special property tax rate for the property; authorizing the Mayor and City Council of Baltimore City or the governing body of a county or municipal corporation to set, by law, a tax penalty against the total tax liability on the property for which a special tax rate has been set; etc.