Planar Offset Srf?

Is there a way to do a 2D offset srf? I’m looking to offset these surfaces but only in the xy direction, no z transformation: adding thickness to the walls while keeping the face edges planar. Using this to 3D print lofts
PlanarOffsetSrf.3dm (525.7 KB)

I would say DupFaceBorder one top or bottom face, Offset the curve and re-extrude… delete the original.

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