Catalyzes the deacylation of triacylglyceryl and cholesteryl ester core lipids of endocytosed low density lipoproteins to generate free fatty acids and cholesterol. a sterol ester + H2O = a fatty acid + a sterol + H(+) cholesteryl (9Z-octadecenoate) + H2O = (9Z)-octadecenoate + cholesterol + H(+) Monomer. Glycosylation is not essential for catalytic activity. Belongs to the AB hydrolase superfamily. Lipase family.