Grosvenor Square was planned as the centrepiece of the Mayfair estate. It was laid out around 1725–31 with 51 individual plots for development. It is the second-largest square in London (after Lincoln's Inn Fields) and housed numerous members of the aristocracy until the mid-20th century. By the end of the 19th century, the Grosvenor family were described as "the wealthiest family in Europe" and annual rents for their Mayfair properties reached around £135,000 (now £). The square has never declined in popularity and continues to be a prestigious London address into the 21st century. Only two original houses have survived; No. 9, once the home of John Adams, and No. 38 which is now the Indonesian Embassy.