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Thanks. Currently, the 4 inch pipe on the left is both the vent all the way to the roof and serves as a drain for the upstairs bathroom.

The top picture is the best that I have for now. The second picture was just to show how tight it was with the wall and stairs. Yes, sanitary tee on it's back is to the water closet. The only vent in the house is up the stack that is the 90 going up on the far left. I was also thinking I'd be...

What is the best way to deal with the situation in the photo attached? I'm replacing the 4" cast iron with 4" PVC. The problem is these pipes are near the bottom of the basement stairs so we need headroom as well as space around the stairs when we need to bring items in/out of the basement like...