Indiana Code Title 36. Local Government § 36-7-11.1-2

Sec. 2. As used in this chapter:

“Commission” refers to the historic preservation commission appointed under section 3 of this chapter.

“Historic area” means an area, within the county, declared by resolution of the historic preservation commission to be of historic or architectural significance and designated as a “historic area” by the historic preservation plan.  This area may be of any territorial size or configuration, as delineated by the plan, without a maximum or minimum size limitation, and may consist of a single historic property, landmark, structure, or site, or any combination of them, including any adjacent properties necessarily a part of the historic area because of their effect on and relationship to the historic values and character of it.

“Historic preservation plan” means a plan designating one (1) or more historic areas, prepared and setting forth a plan for historic preservation by the historic preservation commission under this chapter, and adopted by the metropolitan development commission as a part of the county's comprehensive plan.