Could I make a couple of suggestions regarding rules? Monopoly is actually one of my favorite board games, so I'm familiar with a lot of the computerized / console versions, and how they approach the official game rules, plus house rules.

Perhaps the main game could, of course, follow the official box rules. Optionally, the player could have the option of selecting options from a list of common house rules. These, most commonly, might consist of:

Free Parking rule - Player earns $250, $500, or all assets acquired by the bank up until that point. (a "jackpot" that accumulates as players are taxed against the bank itself) In my games, I usually opt for the $250 rule. Anything more just extends gameplay far too much for my taste.

Landing directly on Go, as opposed to passing it - Player earns double the amount they would for passing Go.

No forced auction rule - If a player lands on a property they do not wish to buy, they do not have to auction it. The official rule is that the property should be forced into an auction if the player can't afford it, or doesn't wish to buy it.

Quick-play - When the game comes down to two players, or the players can agree to end the game at a certain point, (since some games tend to go on for a while) the winner is determined by who holds the most assets at that time. This is calcuated by the value of all (non-mortaged) properties, houses, hotels, and current funds.

Turn-based play - Game ends after X number of turns, (30 would be a solid number) and the winner is determined by who holds the most assets.

Collect no taxes while in jail - If a player is jailed, all their properties are essentially considered to be mortaged.