Yes. Since you would have to downgrade the other properties to four houses, and there aren’t enough houses to put them all up, selling that one hotel would force a downgrade to single houses on three properties. (You would be entitled to all the money from the downgrade, however. Voluntary or forced, you get paid for buildings.)

This is called a “housing shortage” and can be a brutally effective strategy when playing. In order to keep as many houses in my possession, I rarely go up to hotels. (In fact, my buddy Jay and I used going to hotels as the ultimate Monopoly insult against the other guy when playing since we were effectively saying “Yeah, I’ve got this one bagged. You cannot win now.”)

By the way, Monopoly sets usually come with extra houses and hotels. The game should only begin wiht 32 houses and 12 hotels.

It depends on what kind of deal you can make. Unmortagaged properties are worht more, so it’s probably best to not mortage them. There is absolutely no requirement that properties be mortgaged when changing hands for any reason.

I’mciting officially sanctioned tournament rules. Please don’t take it as gospel or an imposition on every Monopoly game palyed universally. I agree that “team Monopoly”, joint ventures, etc. adds to the game in new ways. You’re welcome to set things up any way you wish. Just don’t try those things at a tournament.

The player would first have to sell any liquid assets, such as houses, to pay off the debt. The palyer could also “trade” an exisitng property (mortgaged or not) in lieu of the $50 to any player. (This is effectively selling the property for $50.) Other financial arrangements may be made, such as another player purchasing property for more than $50, etc.

If the player’s assets are so small as to no be able to pay each player in full, then all of the player’s possessions get liquidated completely and distributed equally.

In a word, yes. You earned the “GO” money before being sent to jail, so you are entitled to it.