His company, which at the end of the 19th century was the largest of its kind in the Nordic countries, was after his death in 1906 continued by his nephew Carl Moresco.

Moresco was, however, more interested in a commercial career, and was instead apprenticed to textile merchant Unna at the corner of Købmagergade and Østergade.

After a few years, J. Moresco had developed into the largest manufacturer of women's clothing in the Nordic countries with considerable export to Southern Sweden and Norway.

He is one of the businessmen depicted on Peder Severin Krøyer's monumental 1895 group portrait painting From Copenhagen Stock Exchange in Børsen.

Another group portrait painting, Laurits Tuxen's Leaving the Table depicts a scene from a dinner party in his home.

In 1943, three years after Carl Moresco's death, Villa Adelaide was acquired by Gentofte Municipality and converted into a daycare.