Geometry has a interesting to represent objects inside of another. Check out mulipolygons. https://wiki.openstreetmap.org/wiki/Relation:multipolygon. Basically you create a polygon (area) around the building and another around the parking lot. Then select both areas, right click, select the + to create a multipolygon. When in the editor, see help on relations.
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            Published using OSMCha: https://osmcha.org/changesets/172817009
            