Concrete in the sewer

[Robert Perry]

Hello. I'm buying my second property, a foreclosed house from Fannymae. I just found out there is concrete in the sewer line roughly 20 inches from the toilet. The seller offered 5k off the price but my first quote to get it fixed was 8k. I asked my agent to see if we can get the full 8k but I'd really like the seller to fix it and keep the price as is. Does anyone here have any experience or reconditions for this situation? Thanks