When 622 Commercial was put up for sale in 1967, a classified notice in The Advocate said — in a lovely bit of over- and understatement — “Recently wholly restored by famous artist.” Well, yes. That would have been Robert Motherwell (1915-1991), who owned this house for 10 years. For much of that time, he was married to Helen Frankenthaler (1928-2011). Besides the restoration project, which was already under way by 1961, Motherwell and Frankenthaler were known in the neighborhood for their white Fiat Jolly convertible, which they’d bought in Turin. The house was purchased in 2001 by the painter Cynthia Packard (b 1958), one of Anne Packard’s daughters, whose family lives across the street, at 621 Commercial, and who shows in the Packard Gallery, at 418 Commercial.