We introduce the notions of λ-Baire property and λ-semiopen set using sets of Lebesgue measure zero. For a family A of subsets of the real line, we define the (λ *)-property analogously as it was done in the category case for the (*)-property. The main result is that the family A of all subsets of the real line having the λ-Baire property has the (λ *)-property iff A is situated between the Euclidean topology and the family of λ-semiopen sets.