Opening up the walls of 30 Long Street revealed history. Beneath the paneling of the shuttered auto parts store were layers of paint, posters, child’s drawings, lost menus, and handwritten ledgers. There were swaths of mod wallpaper from a 1960s coffee shop and brickwork laid by turn-of-the-century masons. Decades of shop clerks, bakers, accountants, craftsmen, immigrant entrepreneurs, waiters, rebels, and children had left wisps of their history on the walls of that common, important place.