Seller's attorney added a right of first refusal to the contract three days before closing and I lost 88k in assignment fees because I missed it

That clause was buried in an amendment, not the original purchase agreement, and I had been focused on the title search and the buyer's funding confirmation. My escrow officer caught it four hours before the scheduled close. The seller's family member had a standing right to match any third-party offer within 72 hours, and they exercised it the same afternoon we disclosed the assignment to the attorney. Buyer walked because the timeline collapsed. Deal died. The 88k was the spread on a 1.47M estate in Scottsdale that had been sitting vacant for about 14 months, and I had a cash buyer who had already done two walkthroughs. I have read every amendment on every contract since then, same day it lands in my inbox.