Build a rental application and tenant screening assistant web app with these features: 1. Structured rental application form per listing: identity, employment, income, prior addresses, references, and occupants, with per-field progress saving. 2. Document upload (paystubs, W-2, bank statements, ID) where the AI extracts key values and shows them next to the applicant's typed numbers with mismatch highlighting. 3. Income math: rent-to-income ratio, income stability check across uploaded paystubs, and a side-by-side comparison grid of all applicants for a listing. 4. Fraud flags: edited paystub markers, inconsistent fonts or rounded salary figures, and reference phone verification requests, each shown as a flag with evidence, never as a verdict. 5. Hard stop: no automatic approve or reject anywhere in the product. The AI only summarizes facts and highlights gaps; the landlord marks the decision with a required written reason. 6. Fair-housing guardrails: the app refuses to collect or score protected characteristics, hides applicant photos until decision time, and shows a state-specific disclosure checklist (HUD 2024 guidance plus state AI-screening rules). 7. Adverse-action letter template that the landlord must offer when declining, with the data sources used listed. 8. Communication log per applicant: status emails, view-request messages, and decision notices with timestamps. 9. Compliance-friendly retention settings and export. 10. Multi-listing support for small portfolio landlords, with a waitlist view of applicants per unit.