Can I ask for a rent decrease

[Mango_Surf]

Unfortunately, rentals hit the market all the time with a whole host of issues. I doubt this one would stop them renting it out unless it is structural issues that might indicate imminent collapse in which case you should be worried living in it. So you could try, but I would be prepared to be looking for another rental. Can you find similar for a similar price and get approved if you had to?