RCW 35.83.040

In connection with any housing project located wholly or partly within the area in which it is authorized to act, any state public body may agree with a housing authority, a social housing public development authority, or the federal government that a certain sum (in no event to exceed the amount last levied as the annual tax of such state public body upon the property included in said project prior to the time of its acquisition by the housing authority or social housing public development authority) or that no sum, shall be paid by the housing authority or social housing public development authority in lieu of taxes for any year or period of years.