Article VII, Section 1 of the Washington State Constitution provides that all taxes shall be uniform upon the same class of property. Under the Washington State Constitution, real estate constitutes one class of property, and it must be taxed uniformly within any particular taxing district in Washington. This means that taxes must be the same on real property of the same market value. Uniformity requires both an equal rate of tax and equality in valuing the property taxed.
The Washington State Constitution is amended to allow the Legislature to provide a property tax exemption for a principal place of residence. The Legislature, in its discretion, may place restrictions and conditions upon the exemption.