In Charles Dickens' Great Expectations, how is Jaggers' office described, and how does it reflect his character?

The office of Mr. Jaggers is not far from Newgate Prison, just inside the city limits of London in a very unhealthy section. On a "gloomy street" Pip locates the office of Mr. Jaggers and inquires if the gentleman is in. The clerk opens the door to "a most dismal place," the office of Jaggers. 

The office is small and lighted only by a skylight above. There were not that many papers on his desk,...

The office of Mr. Jaggers is not far from Newgate Prison, just inside the city limits of London in a very unhealthy section. On a "gloomy street" Pip locates the office of Mr. Jaggers and inquires if the gentleman is in. The clerk opens the door to "a most dismal place," the office of Jaggers. 

The office is small and lighted only by a skylight above. There were not that many papers on his desk, as Pip has expected; however, there are other odd objects such as 

...as an old rusty pistol, a sword in a scabbard, several strange-looking boxes and packages, and two dreadful casts on a shelf, of faces peculiarly swollen, and twitchy about the nose.

The two "dreadful casts" are death masks made when men were hanged. Further, Pip describes Jaggers' office chair as "deadly black" horsehair with "rows of brass nails around it like a coffin." The room is small; consequently, the clients of Jaggers have rubbed against the wall opposite the chair and desk, leaving marks from oily shoulders. All about is dust and grit; it is on the swollen faces, the shelves, and the other things in the room.

This room seems befitting of Mr. Jaggers because he speaks of circumstances in final and dismal tones, and he dismisses people with the swiftness of a hangman. There is a Jewish man who beseeches Jaggers on behalf of his brother, but Jaggers shoves the man aside and moves on; there is another man who tells Jaggers that he has found a character witness for someone he cares about, but Jaggers dismisses this man when he sees that he is a drunkard. He is very blunt with Pip himself; when Jaggers asks how much money he needs right now, and by showing him a handful of cards from tradesmen, he tells Pip with the names of the tradesmen, he can keep track of what Pip is doing.

"I shall by this means be able to check your bills, and to pull you up if I find you outrunning the constable. Of course you'll go wrong somehow, but that's no fault of mine.”

His last words cast a sentence upon Pip, and they dismiss him much as Jaggers has dismissed others. Thus, the stiff-backed chair, nailed like a coffin seems symbolic of the "final sentences" he places upon his clients.