1 Acre building lot in O’Fallon! Some mature trees. Restrictions are available to view. Restrictions require a 1800 sq ft ranch, 2100 sq ft 1.5 story and 2400 sq ft 2 story. Potential buyers can contact the city of O’Fallon about setbacks. The lot sits in a flood plain. The buyer will need to reach out to the city of O’Fallon about building requirements.