I need an explanation for this Business Law question to help me study.

This is your class paper assignment, worth 85% of your final grades. You are an assistant to the attorney for the FUN Company. To complete this assignment you must write a two-to-three page report discussing the issues and likely outcome of the case below:

Several weeks ago, SAD Co. CEO met with FUN’s CEO for lunch to discuss potential business ventures between both companies. After a few shots of whiskey, SAD’s CEO tells FUN’s CEO that SAD is interested in purchasing a commercial building that FUN owns in a central area in West Palm Beach. SAD is interested in this building because of the specific location in which it is located. SAD believes that owning a building in that specific location will increase their business significantly. SAD’s CEO offers FUN’s CEO to purchase that specific building for $5 million. FUN’s CEO responds that FUN estimates that the building is worth $9 million and that they are willing to sell the building for that price give that they have no use for it. SAD’s CEO takes out a $1.00 bill gives it to FUN’s CEO and says “this is my payment so that you give me time to talk to my board and see if we are willing to pay $9 million.” FUN’s CEO laughs and puts the $1.00 bill in his pocket. Both CEO’s shake hands and say goodbye and leave. The next day SAD’s CEO calls an emergency meeting to discuss the $9 million purchase price and the board agrees to the purchase of the building for $9 million. Immediately after the meeting, SAD’s CEO calls FUN’s CEO on the phone and tells him that SAD agrees to purchase the building for $9 million. FUN’s CEO tells SAD’s CEO that FUN has decided not to sell the building because after their meeting yesterday they realized how much potential the building actually had. SAD is now demanding that FUN honor its word and sell them the building for $9 million.