MB4 229a: Additional Laws Regarding a Mavui (365:5-8)

Carrying and sitting at the edge of a mavui adjacent to a reshut harabim under the lechi or adjacent to the korah. Can one carry if the lechi or korah has been taken down (on Shabbos)?

Carrying in a walled city.

If a shituf mavuot was made and the korah broke can one carry in an adjacent chatzer?