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In this paper we investigate multinormed W*-algebras in terms of the central topologies of W*-algebras. The main result asserts that each multinormed W*-algebra can be realized as a local von Neumann algebra on a certain domain in a Hilbert space. Moreover, it admits the predual (unique up to an isometry), which is the ℓ1-normed space. In the normed case the assertion is reduced to the known Sakai theorem. [ABSTRACT FROM AUTHOR]