Grosvenor Street was mentioned in Rebecca, when they were looking for clues from Rebecca's diary. In her diary, the telephone number 0488 was written next to the name Baker. They call this number and speak to Lady Eastleigh, who lives on Grosvenor Street. However, she is unable to help them. This street is significant to the story because it represents a false lead in the investigation into Rebecca's death. The telephone search eventually leads to Dr. Baker, whose information becomes crucial to understanding Rebecca's motives and the truth surrounding her death.
While researching Grosvenor Street, I found that it is a very prestigious street in Mayfair, Central London. I found that famous people like Oscar Wilde and John Adams have lived there. So the fact that a number from Rebecca's diary leads to Grosvenor Street creates an image of wealth and respectability. This helps highlight the important theme of class and social hierarchy that is present throughout the novel. Although the number doesn't directly prove Rebecca had connections to this street, it reflects the wealthy social environment that surrounds her character. Throughout the novel, Rebecca's status as Maxim's wife and mistress of Manderley gives her influence and power. Her position in the upper class reflects the importance of money and social connections in maintaining social status. Unlike Rebecca, the narrator comes from a less privileged background and originally works as a paid companion. Rebecca seems comfortable in wealthy social circles, while the narrator frequently feels that she doesn't belong.
https://www.british-history.ac.uk/survey-london/vol40/pt2/pp33-35
https://www.alamy.com/stock-photo-aldershot-grosvenor-road-early-1900s-57334606.html
https://www.alamy.com/stock-photo/grosvenor-street%2C-london.html?blackwhite=1&sortBy=relevant