Quote 25
Round the corner from the by-street, there was a square of ancient, handsome houses, now for the most part decayed from their high estate and let in flats and chambers to all sorts and conditions of men; map-engravers, architects, shady lawyers and the agents of obscure enterprises. One house, however, second from the corner, was still occupied entire; and at the door of this, which wore a great air of wealth and comfort, though it was now plunged in darkness except for the fanlight, Mr. Utterson stopped and knocked. (2.38)
Dr. Jekyll’s house is well-appointed and comfortable. Again, this reflects the generally respectable happenings inside the house.
Quote 26
As the cab drew up before the address indicated, the fog lifted a little and showed him a dingy street, a gin palace, a low French eating house, a shop for the retail of penny numbers and twopenny salads, many ragged children huddled in the doorways, and many women of many different nationalities passing out, key in hand, to have a morning glass; and the next moment the fog settled down again upon that part, as brown as umber, and cut him off from his blackguardly surroundings. This was the home of Henry Jekyll's favourite; of a man who was heir to a quarter of a million sterling. (4.11)
Mr. Utterson is incredulous that the "heir to a quarter of a million sterling" would live in such an obviously shabby (and shady) neighborhood.
Quote 27
It was the first time that the lawyer had been received in that part of his friend's quarters; and he eyed the dingy, windowless structure with curiosity, and gazed round with a distasteful sense of strangeness as he crossed the theatre, once crowded with eager students and now lying gaunt and silent, the tables laden with chemical apparatus, the floor strewn with crates and littered with packing straw, and the light falling dimly through the foggy cupola. (5.1)
While Dr. Jekyll inhabits a large, comfortable house, Mr. Hyde spends most of his time in the laboratory—"a dingy windowless structure." Buildings reflect what goes on inside.