In the last reply, the spacing got messed up in the post.
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I assume it's an I-Beam. You can build a 2 x 4 box-in that covers it. Your drywall/plaster will attach to the box-in. The box-in will attach to the...
A general contractor can do it. There are several jobs involved:1. remove earth for stairway2. cut through wall for new doorway3. provide for drain...