Amends the Property Tax Code. Provides that, for the purposes of assessment, property registered in perpetuity with the register of areas under the Illinois Natural Areas Preservation Act is considered to be encumbered by a public easement and shall be depreciated to a level at which its value is $5 per acre, and any improvement, dwelling, or other appurtenant structure present on that land shall be valued at 33 1/3% of its fair cash value. Provides that a conservation right on land preserving a habitat for plant and animal species that are native to Illinois (currently, State or federal endangered or threatened species or federal candidate species) is considered to provide a demonstrated public benefit. Provides that a conservation right on land located adjacent to a park, conservation area, nature preserve, or other land or water area that is publicly owned or otherwise permanently protected for conservation purposes is considered to provide a demonstrated public benefit if the conservation right on that land furthers the conservation purposes of the adjacent protected area. Effective immediately.