I was going to fix the leaking urinal at the mall but the shut off valve normally used must be bad too. I tried shutting it off as tightly as possible but the water flow won't stop. I tried taking off the housing for the flush lever where the replacement kit goes but was afraid to take it all the way off because water was coming out too fast. I went into the basement - all the drain lines there from sinks and toilets but no water supply that I could see. There has to be a main shut off somewhere. Could it be in the ceiling above the bathrooms? This is in the men's room and is next to the women's and several fast food places. I've never seen any such plan in the maintenance room. I was just wondering if the code might suggest something. Thank you