1 house on 2 lots

[Renardon Calhoun]

BP. There is a property that has become available from one of the builders I do work for. It a tri-level house that sits on 2 lots in a town called flossmoor il. The owner is selling it for 235k I know I can get it down to at least 200k. Is this a good buy. My idea is to rehab the existing house and build a new house on 2nd lot. With my building performance background would do both projects with the goal of making it energy efficient. Which will perform and be a lot healthier that the average house. By me being a carpenter I could do a lot of work with my crew. I looked at what existing houses were selling for in that area and for 2 story, 4 bed and 3 bath it was selling for 245k. Would this be a good investment?