Looking at purchasing a rental home which has been unoccupied for along time...don't know how long. I have purchased a few homes where I got surprised when getting the water turned on, only to find out we had leaks in the main incoming line, and was fairly expensive to repair! This time, I can get the water turned on at the street city valve, with the house main shut off valve turned off. There are unfinished plumbing openings in the house, so it is not possible to open the house shutoff valve. If this is done, how would one check for main line leaks to the meter, to the home, which are buried lines?