38 rue Sainte-Croix-de-la-Bretonnerie, from 1928, using the marques "A. L." and "Guy". Leconte produced views and maps of Paris and floral cards. The Leconte business still exists. (Information from cparama, which is a useful list though it only shows publishers which produced some views of Paris). I think the cards with a printed A.L. logo are all views and have Leconte's name on the address side.