Nothing in RCW 36.35.160 through 36.35.270 contained may be construed to deprive any city, town, or other unit of local government that imposed special assessments on the property by including the property in a local improvement or special assessment district of its right to reimbursement for special assessments out of any surplus over and above the taxes, including amounts deferred under chapters 84.37 and 84.38 RCW, interest and costs involved.