Nine percent below is not inherently insulting, but support it with the updating costs and the limited evidence from completed sales rather than the 76 days alone. Present the financing proof, flexible timing and a short, clear response deadline as benefits to the seller.
Before offering, try...
Our offer on an apartment says we accept it in its present condition, but it also includes an inspection contingency. The seller is treating any request for further information or a credit as contrary to the spirit of an as-is offer.
I understand the exact wording and local law will control...