In 1904 Longworth Hall was reported to be the largest structure of its type in the world. Listed on the National Register of Historic Places, the Longworth Hall Office Complex and Design Center was originally the Baltimore and Ohio Freight Terminal. Longworth Hall's sister building is Camden Yards in Baltimore.

Longworth Hall rests on ground originally owned by Nicholas Longworth. In fact, some lease payments are still made to relatives of Nicholas Longworth for land leased into perpetuity.

Longworth Hall remains one of the longest buildings in the country, and is over one quarter mile in length.

80,000 feet of piling were driven to support the foundations, which are built of concrete, 4,000 cubic yards were used.  The piers between the doors on the first floor are made of Bedford stone (Bedford, Indiana).  4,250,000 bricks were used in the walls.

The floor loads are carried on steel girders and these in turn are carried on steel columns, 1,200 tons of steel required.  Floors, joists, roof beams, etc., are frame requiring 2,500.000 feet of lumber.

 1,277 feet in length, 5 stories high, and divided into 6 sections by heavy fire walls.  All floors are double, being 1 3/8" maple on top of 1 3/4 yellow pine.  Each floor will carry 400 pounds to the sq. foot.

The lower floor is designed as the inbound freight house with the upper 4 floors for storage warehouse. The inbound Freight House (Longworth Hall) -- delivery of freight on the 2nd St. side. On the North side of the building the inbound tracks had a capacity of 65 cars.

The facilities also consisted of an Outbound frt. house, transfer shed (1,250 feet long),  a receiving yard [on the North side of the outbound House - 45' wide and 1,100' long paved with brick.

All in all the total facility trackage had the capacity of 125 cars. There was also a boiler house and a 6 stall roundhouse a coal tipple, with other locomotive services.  The roundhouse was used primarily for passenger locomotives.

Besides the space devoted to the storage of miscellaneous goods, there was a United States Customs Bonded Warehouse, for the care of imported goods.  It was stated that some of those goods remained stored up to 3 years until the proper duty was paid.

Special thanks to Dan Finfrock for help with research on Longworth Hall.