My wider point is that an adviser—no matter how great her knowledge, methods, and skills—cannot render good advice until she knows the identity of the advisee and learns the advisee’s goals and interests.
In the situation described, the seller and the buyer might have diverging interests—at the least, one ought to recognize that possibility.
A search for “the correct solution” is not in the abstract. Which solution is fitting depends on what one’s advisee hopes to accomplish.