38 Grosvenor Square Mayfair W1K Timeline News and progress updates from 38 Grosvenor Square new development in Mayfair W1K Post a new milestone 38 Grosvenor Square building for sale 38 Grosvenor Square, a Grade II* listed townhouse next to the Biltmore Mayfair overlooking Grosvenor Square, is available for sale through Knight Frank. 14/02/2024 by Buildington