Md. Code Ann., Real Prop. § 4-110

Notwithstanding § 5–302 of the Land Use Article or any similar public local law or ordinance, every deed executed or recorded before June 1, 1974, conveying land in a subdivision a plat of which had not been approved by a planning commission is fully valid and effective according to its terms if the deed would have been valid and effective but for § 5–302 of the Land Use Article or a similar public local law or ordinance.