The B-420 consistently performs well as a rental. In Madison’s market, a 1-bedroom ADU with private entry at this size competes directly with 1-bedroom apartments — and wins on privacy and independence. Most apartment tenants pay comparable rent for a unit in a building with shared hallways and common areas; the B-420 gives them their own structure. The footprint fits most single-family lots in Madison and Dane County that have 50-foot lot widths, and the setback requirements are manageable. Build cost is lower than the larger B-series models, which improves the overall return on investment.