Registration for rental properties in the City of Washington were due May 1st, but about 275 still need to be turned in. Steve Donnolly, building and zoning official, says reminder postcards were sent to landlords. In Washington, rental properties are required to register and pay the fee annually. The fee is $25 annually for the first unit and $5 for every additional unit in the same building. Property owners can register their rental properties at City Hall. The City has about 915 rental units.