Concerning the registration of certain corporations and trusts that own single-family homes and condominium units.

SB 5580 requires corporations, trusts, and other entities owning 20 or more single-family homes or condominium units in Washington to register with the Secretary of State. They must report contact details, property addresses, end use (like rental or sale), purchase prices, and business locations. The law aims to create statewide transparency about corporate housing ownership, which the bill cites as increasing rapidly (22% of single-family purchases in 2022). Exemptions include banks that acquired properties through foreclosure within 12 months and "build to rent" developments. This registration is intended to help policymakers address housing affordability without restricting ownership.