Del. Code Ann. tit. 9, § 1374
The adoption of this subchapter shall in no manner relieve any property owner of any obligation imposed upon a property owner prior to May 26, 1965, with respect to the assessment of any property or the payment of any tax nor shall it in any manner increase the responsibility of such property owner nor deny a property owner any right possessed prior to May 26, 1965, except to the extent specifically provided in this subchapter.
9 Del. C. 1953, § 1312; 55 Del. Laws, c. 85, § 2; 70 Del. Laws, c. 186, § 1; 71 Del. Laws, c. 401, § 59; 84 Del. Laws, c. 412, § 5