seller asking for help with cost of adding 2nd water line

[Ericka L.]

Under contract for a duplex. city came and inspected the property (separate from the typical inspection I had done a few days after my offer was accepted) and they came back with a list of issues the seller must fix before closing. apparently there is one water main line to the house and the tenants have been sharing the water costs. the city is requiring that a second water line be added. the seller has asked if I would help with the costs...to the tune of $6,500. I told my attorney to tell her no (both he and my agent were in complete agreement that getting the place up to code is something I should not be even partly responsible for). my agent asked if I was prepared to walk away from the deal if the seller insists I help. what would you all do? any experience with this issue?