I really like this game and thought I'd share some of the advanced rules. It is NOT stated anywhere in the manual and has to be researched online through various sources (which I share below).
- Wildcard properties can't be used to settle debts, so you can keep them even if you are bankrupt! The only way to take them are through FD, SD and DB.
- Using double the rent takes a turn although it is played together with the rent card. You can also use x2 double the rent cards to quadruple your rent. This takes up all 3 of your turns. Note that just ONE 'Just Say No' card is required to block this completely.
- Houses and hotels are seized along with property if DB is used.
- You need a just one house to build a hotel and the value does not stack with houses, only max +4m.
- Houses/Hotels go to the bank before being used to pay another player. Thus the other player can only use it as bank.*
- Houses/Hotels can be transferred to other sets within your own hand, but can never 'float' around.*
- You can't use 'Just Say No' for other people.
- If you force a deal and both people win, the person who forced the deal will win as it is his/her turn and you can only win on your turn.
*As of this date, there has been no official confirmation with regards to the these rules. Hasbro has officially stated that "They will look into this". However this is widely regarded as the 'right way'.
Useful Reference Links:
Board Game Geeks
Official Hasbro FAQ