About

Chicago Value Map is a solo-operator tool made public (beta opened 2026-07). It exists because its operator underwrites 2–4 unit buildings in Cook and Lake County, IL, and wanted one system where every number — tract score, ARV, rent, offer — comes from one code path, carries a version stamp, and gets graded against realized sales. The thesis is depth over breadth: two counties’ institutional plumbing (assessor sales records, triennial reassessment shocks, SAFMR voucher gaps, 311 flood clusters) fused with backtested underwriting beats a fifty-state median. The current model’s median ARV miss is 20.1% against 744 resales (as-of 2026-06), and that number sits on the accuracy page instead of behind a demo, because the numbers are the brand. There is no company, no sales team, and no support desk — contact is GitHub issues (repository link to be published). If the writing here reads unusually blunt for a real-estate site, that is because the site sounds like the person who wrote the backtests, and it is.