attempted to clear clog via roof vent, as well as running cable snake though bathroom sink drain was able to get the drain to slowly begin to drain but continued to pull back roots when running snake from vent and kept hitting a T that I was unable to pass. While running snake from drain inside unit the cable snake exited the roof vent on the next unit over. Due o the way the two units are tied in I am able to get my equipment to turn down stream to fully clear clog. Strongly recommend performing emergency spot repair where sewer line exits the building and installation of sewer cleanout to allow is to properly snake the drain. Attempted to dig in front of both units in order to try and locate cleanout but was unable to locate one.