The written waiver must be signed by the mortgagor, meaning the owner-borrower/purchaser who is waiving the right to purchase owner’s title insurance. Pennsylvania regulation requires the title insurer or title agent, when issuing a mortgagee’s title policy in a purchase-money transaction and no owner’s policy has been ordered, to advise the mortgagor in writing that the lender’s policy does not protect the owner. If the mortgagor elects not to purchase owner’s coverage, the company must obtain the mortgagor’s written statement acknowledging receipt of the notice and waiving the right to buy owner’s title insurance. The mortgagee receives the loan policy; the waiver protects the owner-purchaser disclosure process.