 The National Gallery at Pall Mall was frequently overcrowded and hot and its diminutive size in comparison with the Louvre in Paris was the cause of national embarrassment . But Agar Ellis , now a trustee of the Gallery , appraised the site for being " in the very gangway of London " ; this was seen as necessary for the Gallery to fulfil its social purpose . Subsidence in No. 100 caused the Gallery to move briefly to No. 105 Pall Mall , which the novelist Anthony Trollope described as a " dingy , dull , narrow house , ill @-@ adapted for the exhibition of the treasures it held " . This in turn had to be demolished for the opening of a road to Carlton House Terrace . 
