What is the most expensive property on a standard UK monopoly board?

Mayfair is the most expensive (£400) Dark Blue property in the UK standard version of the classic Monopoly board game. Mayfair, in reality, is an area of Westminster, Central London, England.

Today the Mayfair district in actual fact is mostly commercial. Many former homes have been converted into offices and have become major headquarters for corporations, embassies, hedge funds, and large real estate businesses. There remains in the area a substantial quantity of residential property as well as some exclusive shopping establishments and restaurants. Also present are London's largest concentration of five star hotels. Real rent properties are among the highest in London and the world.

In the game, the Dark Blue properties have remained the most expensive and the best ones to have in the UK version. While they are expensive, they are actually the cheaper locations to build hotels on, as compared to the Greens. Even the Reds and Yellows are higher in some of their building costs. The Dark Blues rank 5th out of 10 in payoff percentage and 9th out of 10 in visitation frequency.