How to get the height of an entity with SDK

Hi,   I'm using the SDK to create entities. Works like a charm. Positioning also works nice in a clean model.    How can I get the metadata of an entity (like height) so I can get the hieght of an entity and create another that is not over the (new/existing) entity, but to be placed under it. Where can I get the height so I can calculate where the entity ends.   Thanks!
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