Indiana Code Title 36. Local Government § 36-7-32-9

(1) A street, road, bridge, storm water or sanitary sewer, sewage treatment facility, facility designed to reduce, eliminate, or prevent the spread of identified soil or groundwater contamination, drainage system, retention basin, pretreatment facility, waterway, waterline, water storage facility, rail line, electric, gas, telephone or other communications, or any other type of utility line or pipeline, or other similar or related structure or improvement, together with necessary easements for the structure or improvement.  Except for rail lines, utility lines, or pipelines, the structures or improvements described in this subdivision must be either owned or used by a public agency, functionally connected to similar or supporting facilities owned or used by a public agency, or designed and dedicated to use by, for the benefit of, or for the protection of the health, welfare, or safety of the public generally, whether or not used by a single business entity.  Any road, street, or bridge must be continuously open to public access.  A public facility must be located on public property or in a public, utility, or transportation easement or right-of-way.

(2) Land and other assets that are or may become eligible for depreciation for federal income tax purposes for a business incubator located in a certified technology park.

(3) Land and other assets that, if privately owned, would be eligible for depreciation for federal income tax purposes for laboratory facilities, research and development facilities, conference facilities, teleconference facilities, testing facilities, training facilities, or quality control facilities: