Yes, plumbing is a perennial problem. especially if the building is old, then all the pipes are rotten. We bought the territory for our enterprise and there were also many problems with plumbing. Our management has signed a cooperation agreement with POM Plumbing https://pomplumbing.ca/commercial-plumbing-scarborough/ . I have saved their contacts for myself and also contact them if necessary. So I advise you to call them and let the technician see what your problem is.