I love everything about this Stephen Sills-designed Manhattan triplex: the grey, scored plaster walls and the neutral, white-ruffle-slip-covered palette of the principal floor; the way the interior morphs from cool and calm to rich and warm; the incredible collection of Jean-Michel Frank furniture – a staple, seemingly, of many a Sills interior; and the home’s overall spirit of Frenchness.  C’est très chic (François Halard photography courtesy of AD).