What passage from The Strange Case of Dr. Jekyll and Mr. Hyde implies a sense of heritage and wealth.?

In "The Strange Case of Dr. Jekyll and Mr. Hyde," the passage where Mr. Utterson describes the door to Dr. Jekyll's laboratory as having "strong postern and good steel" implies a sense of heritage and wealth. The use of strong materials and security measures suggests a level of prestige and affluence associated with Dr. Jekyll's family history.