How to offset a brep?

I want to offset a brep, with the same result as ‘offsetsrf’ inside rhino.
The ‘offset surface’-component does not work with my brep (which is a polysurface).

I know there is a grasshopper plugin to solve this problem, but I want to find a solution without plugins.

Thank you!

Dunno if any plug-in has it but offsetting breps is not so easy (of course you haven’t shown us the brep so who knows) but you can use this C# method here:

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