I Just Bought The Brooklyn Bridge!

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So I couldn't quite afford the stiff price of $15,000 for the lovely Josef Breitenbach photo of the Brooklyn Bridge (view here,) but I could swing the $12.00 for this lovely photo dated 1892. I couldn't resist. I think its pretty special. I believe this is the Manhattan side of the Brooklyn Bridge. Tell me if I am wrong.
Does anyone know what the neat building with the cool flag-adorned tower in the foreground is?
Below is the accompanying text printed right below the photo:

NEW YORK AND THE BROOKLYN BRIDGE.-" On se fait a tout avec le temps, ("One gets accustomed to everything in time,") is a true proverb. No doubt the old Egyptians hardly glanced at their gigantic Pyramids after a dozen years of familiarity with their stupendous forms. So now the people of New York and Brooklyn find nothing specially extraordinary in this great arch of steel and iron which unites their cities, simply because they have at last become accustomed to beholding it. It is, however, one of the marvels of the world. Each of its mighty towers rests upon a caisson constructed of yellow pine timber, which on the Brooklyn side is forty-five feet, and on the New York side seventy-eight feet below the surface of the water. The towers erected on these enormous foundations are one hundred and forty feet in height and fifty feet in width at the water line. The bridge itself is suspended from four cables of steel wire, each about sixteen inches in diameter, and having a deflection of one hundred and twenty-eight feet. The central span across the East River from tower to tower is 1,595 feet long. The entire length of the structure is 5,989 feet. It is eighty-five feet wide, and contains a central promenade for foot passengers, two railroad tracks, along which trains of cable ears are run every three minutes, and two roadways for carriages. The height of the floor of the bridge in the center to high-water mark is one hundred and thirty-five feet, so that navigation is not impeded. The construction of this noble specimen of engineering skill was begun in January, 1870, and was completed in May, 1883. Its cost was about fifteen millions of dollars. The fare across by car is three cents, and for foot passengers one cent. About 125,000 people cross it daily.
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