The three-decades-old Sal’s Hairstylists in Brooklyn—vacant since the death of Giorgio “Sal the Barber” Zocco, in April—has a new tenant. And it’s not another Smith Street boutique; it’s a Zocco-family-blessed barbershop called Persons of Interest, owned by TV producer Steve Marks and staffed by current and former barbers from upscale chop shops Spiff and Deluxe. Though Sal’s $20 snips are gone (cuts are now $40 and come with a hair wash, free beers, and a shiatsu massage), the original chairs, barber’s pole, and tropical Day-Glo mural still stand (299 Smith St., nr. Union St., Carroll Gardens; 718-858-5300).