At the seller's option, a real estate contract may be foreclosed in the manner and subject to the law applicable to the foreclosure of a mortgage in this state. I. Contract Classifications.A. Express vs. implied. Washington Revised Code Title 61. Mortgages, Deeds of Trust, and Real Estate Contracts Section 61.24.160. The general rule is that contracts do not need to be in writing. The exception would be the contracts falling under the statute of frauds. Mortgages, Deeds of Trust, and Real Estate Contracts Section 61.24.026. Washington real estate contract must include specific information about the parties and the property to be valid and enforceable agreements. We will explore the common parts of the purchase agreement, and some of the things you might choose to include when making an offer.