The International Trade Commission will be moved from its stately, but decaying, 144-year-old headquarters into a seven-year-old building a block away although the Senate has barred the move, according to the General Services Administration.

GSA Regional Administrator William F. Madison said the ITC's allegations that there are problems with roaches, rats and a poorly designed parking garage at the Bicentennial Building at 601 E St. NW are more fiction than fact.

In a letter to ITC Chairman Alfred C. Eckes Tuesday, Madison said that, because this was a "forced move," GSA would "fund the necessary designs and alterations up to a standard level." GSA "is prepared to make every necessary improvement to successfully accomodate ITC's needs with the Bicentennial Building," Madison said.

The two federal agencies have been squabbling since it became apparent that GSA was neglecting repair work on the ITC's headquarters--the so-called Tariff Building--because fo budget constraints. Congress has tenatively ordered the Tariff Building, at 701 E St. NW, transferred to the Smithsonian Institution for use as a museum and has asked GSA and ITC leaders to get together to find the tariff-writing agency new space.

In detail, Madison said ITC officials exaggerated the facts when they contended that rat, roach, air conditioning and garage problems at the Bicentennial Building made it a poor choice as an agency headquarters.