A property a player declines to buy simply stays with the bank rather than going to auction. Gentler and slower than the official rule — worth knowing that skipping auctions is the single biggest reason a game runs long.
Does your table play this?
Landing exactly on GO pays double salary. Passing it normally still pays the standard amount.
All fines, taxes and fees are paid into the middle of the board instead of to the bank. The next player to land exactly on Free Parking collects the pile. The most widely played unofficial rule in the game — note it lengthens the game considerably by pumping cash back in.