I like to describe the inspection request negotiation this way - you have the right to ask, the seller has the right to respond. A roof should not leak, if it does, it needs to be repaired. If the seller is refusing to do so, then you should be protected under the Inspection Contingency. The gray area arises when a seller responds but not entirely to the liking of the buyer - this is a bit trickier.
Talk to you attorney about navigating through this - and good luck to you!
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I started typing and just realized this is an old question, answer is done buy not timely.
In the RANWC contract 5.0 the standard contract language automatically voids the contract unless attorneys for the seller or buyer request and grant an extension prior to the ten provision for resolving home inspection issues. So out of state agents, the Illinois contract has language to kill a deal when buyer and seller do not agree on how to adjust for home inspection deficiencies. My suggestion is to let it expire and write a new contract adjusted lower to the amount you want to pay. Unless there is another buyer in the wings, let this deal expire and write a fresh contract modifying the price.
As you know, we use attorneys in Northern Illinois. You would best serve your client by allowing the attorney representing them to make a determination. These types of issues arise during the A&I contingency period on a fairly regular basis. I'm sure your client's attorney will know how to handle this.