The first Monopoly board game as we know it was released in 1935 and the colors and properties have remained the same ever since. It was loosely based on property values at the time, but the board would look a little different if we factored in modern house prices. Dark Blue The most expensive roads in Monopoly are the Dark Blues: Mayfair and Park Lane. However, new research by gaming experts at 1337.Games has found that wouldn’t be the case in 2024. Mayfair is still most expensive, with a staggering average house value of £6,928,740 but the other Dark Blue wouldn’t be Park Lane, it would actu…