Help with property in chicago

[Cory Ferguson]

Hello everyone! I have a property in the chicago area that is a house on a 5000 sq ft lot. this house in tucked tight on one side of the lot leaving a larger portion of the lot empty on the corner I would say approximately 3000 sq ft area.I wanted to figure out what my first steps would be/ who I would need to talk to first to possibly divide the lot into two properties. The existing house is a complete gut as well and other options such as a complete demo of property and use large lot to build a multifamily unit. any feedback is welcome just wanted to get other opinions