Here is the list of rare McDonald's Monopoly game pieces for 2012, along with the prizes you could win:
Mediterranean Avenue (#925) (8,500 Prizes): $50 cash. Mediterranean Avenue is the rare Monopoly game piece. The odds of finding the winning combination is 1 in 402,602.
Vermont Avenue (#928) (20 Prizes): $5,000 cash. Vermont Avenue is the rare piece. The odds of finding the rare piece and finishing the winning combination are 1 in 578,695,060.
Virginia Avenue (#932) (250 Prizes): A Beaches Luxury-Included family vacation worth $7,500. Virginia Avenue is rare. The odds of finding rare Virginia Ave are 1 in 12,953,122.
Tennessee Avenue (#934) (20 Prizes):$10,000 cash. Tennessee Avenue is rare. The odds of finding the rare game piece for this property are 1 in 518,330,833.
Kentucky Avenue (#936) (20 Prizes): A trip to Any Delta Vacations Destination worth $10,000. Kentucky Avenue is rare. The odds of finding rare Kentucky Ave are 1 in 161,914,024.
Ventnor Avenue (#940) (20 Prizes): $20,000 cash. Ventnor Avenue is rare. Finding rare Ventnor Ave has odds of 1 in 499,516,192.
Pennsylvania Avenue (#944) (20 Prizes): A 2013 Fiat 500 Sport Hatchback worth $18,500. Pennsylvania Avenue is the rare Monopoly piece. Odds of finding Pennsylvania Ave and winning the car are 1 in 158,948,243.
Boardwalk (#946) (2 Prizes): $1,000,000 payable as an annuity. Boardwalk is the rare game piece. Winning the million-dollar prize by finding the rare Boardwalk place are 1 in 306,939,484.
Short Line (#950) (20 Prizes): An EA Sports fan trip worth $7,000. Short Line is rare. The odds of finding the rare Short Line piece and completing the set are 1 in 539,566,072.