Mr. Utterson, Dr. Henry Jekyll's lawyer, lives in London, England, in a "bachelor house" of his own. He must live relatively close to Mr. Edward Hyde's residence because, on one of his Sunday walks with his kinsman, Mr. Richard Enfield, they pass his home, which Enfield refers to as the "Black Mail House." Enfield knows that it is Hyde's home because he's seen this man use a key to get in. However, he recounts a story wherein Hyde essentially trampled on a young girl, and when pressed to offer the family some financial remuneration, he went into the house and returned with a check written out by Dr. Jekyll. Thus, Enfield comes to the conclusion that this horrid little man must have some dirt on Jekyll from his younger days that he is using to blackmail the good doctor.
Utterson also appears to live pretty close to Dr. Lanyon, another of Dr. Jekyll's oldest friends, because, on foot, he sets "forth in the direction of Cavendish Square" to ask Lanyon about Jekyll's relationship to Hyde. Cavendish Square is in London's West End.