With blocks like this, it can be unsafe to try to guess how the building is split internally. Sometimes the numbers will relate to flats on different floors, sometimes the flats will each occupy more than one floor. The safest option is to create a node entrance=home at each entrance position on the perimeter of the building way and apply housenumbers to each entrance node rather than to the building itself. See https://www.openstreetmap.org/way/108043002/ for an example.
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To help you mark the position of the entrances accurately, I've changed the building outlines from simple rectables so they better correspond to protrusions visible on bing. 