You're best bet is to remove the table first. If you can. pull the table out of the slot along the wall, then rotate it clockwise 90 degrees. Now pop the table straight up to remove it from the top of the post. This reduces some friction and makes the post a bit easier to turn. Use the wrench as low on the post and as close to the base as possible. Consider using some leverage, like slipping a length of pipe over the wrench handle.
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