Why would a cast concrete wall require a separate lintel? The concrete is a monolithic structure above the window and around it to the bearing surface at the slab. Depending on the orientation of the embedded steel in the wall, it ‘should’ even be possible to add a double slider in place of a single-hung window. Penetrating radar above and around the window to document steel placement would be prudent, I think. Then, of course, a nod from an engineer, the ARC, AND the building department. From there, grab the wall saw!
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