A Practice Note providing an introduction to a commercial real estate development project in Illinois. This Note identifies the key considerations involved in the development process in Illinois and includes discussions of development planning and documentation, due diligence, entitlements and permitting, zoning, land division, and construction-related considerations. While some of the development process is governed by local laws where the real property is located, this Note provides useful guidance to address common factors affecting commercial development projects in many jurisdictions throughout Illinois.