Grain was king in Red Hook, Brooklyn, in the latter half of the 1800s, .  Boats loaded with grain would float down the Erie Canal, then down the Hudson River to the grain storehouses of Atlantic Basin, and later, in an even bigger way, Erie Basin.  From there the grain might be bought by local bakers and breweries or loaded on ocean going vessels for ports near and far. 

In 1851 the Atlantic Dock Mills was located in a three story stone building Nos. 17, 18, 19, and 20 Atlantic Dock.  The Annual Report of the American Institute, on the Subject of Agriculture for that year noted the business was "probably the largest in the world engaged in the exclusive manufacture of bread stuffs from Indian Corn, such as corn flour, corn farina, corn meal, and other varieties, by cracking, by grinding, by evaporating all moisture from the articles by proper steam heat, and by motion and ventilation during the drying process."  The American Female Guardian Society and Home for the Friendless noted the donation of corn flour form the Atlantic Dock Mills, that same year. 

From what is currently known, it appears that the Atlantic Dock Mills did not last long.  They received a lot of attention in print in 1851 but there it seems to end.

Research has found that 1000 bushels of voyage damaged northern yellow corn was sold at auction from 20 Atlantic Dock in 1853 and in 1855 The New York Morning Courier, ran this classified ad:

To exchange for a farm or unencumbered Real Estate in this city, or in the West, a large double 4 story Granite Warehouse, No 19 Atlantic Dock, 39 by 180 feet.

Text of Article:

New-York Daily Tribune, Wednesday, January 15, 1851
 
ATLANTIC DOCK MILLS.—Indian Corn Flour and Indian Corn Farina dried and manufactured by "Stafford's Patent Processes, "may be obtained of the following and other respectable Grocers in this City:

H. G. Greenwood, 487 Broadway.
W S. Walt. 301 East-Broadway.
Albert T. Albro, 373 Bowery.
Thos. B. it W. 8. Pitman, 205 Hudson-st
Thos. Hope & Co. cor. Chambers and West Broadway.
William &. Robert Ballagh, Chambers st.
Park & Tillford  112 Slxth-av.
A. T. Higbie, 180 Flrst-av.
O. Angevine, 222 Sixth av.
John W. Cook. Thirteenth st. and  Fifth-av.
E. Deming. 67 Third-av.
Morris i. Fowler, University-place, cor. Twelfth-st.
V. J. Yale, 6 Union place.
J Crawford, 209 Henry-st.
Krapp & Beam, 611 Houston-st.
W. E. & W. Sparks, 39 Lexlngton-av 

“Indian Com Flour" is designed tor making Bread, Puddings and Cakes and for mixing with Wheat, Rye or Buckwheat Flour, and will be found on trial a vary superior article. It is put up in double papered packages of 7 lbs. and in boxes of one dozen each.

"India Corn Flour Farina” an entirely new and most delicious article for making Puddings, Mush, &c. and will prove admirable substitute for Rice, Samp, and Hominy.  As an article for the composition of Puddings  the Farina has no rival.  It is put up in 1 lb. papers in beautiful style, and in boxes  of 4 dozen each. At the extremely low price of 6 ½  cents per single package.
 
These articles are sold at wholesale by Mesrs Allen &Whittlesey, 21 South st; J.M. Hoyt & Sons 176  Washington st. and of A.G. Benson, 39 South st or at the Mills.
 
Consumers can obtain of the Grocers a pamphlet of 16 pages entitled, “Remarks on Indian Corn: its Preservation and Manufacture, with Recipes for Cooking,” &c.
 
Orders addressed to E. Bronson, Agent, Atlantic Dock Mills Company, Nos. 17, 18, 19, and 20 Atlantic Dock, Brooklyn New York, will receive prompt attention and dispatch.