Next Door Kitchen & Bar closed on Pearl Street

BOULDER — Next Door Kitchen & Bar, a downtown Boulder restaurant concept co-founded by Kimbal Musk, billionaire Twitter Inc. owner Elon Musk’s brother, has “permanently closed” at 1035 Pearl St., according to a sign on the eatery door.

The restaurant — known throughout its dozen years in operation as the Kitchen Next Door, Next Door American Eatery and ND streetBAR — shut its doors at the Boulder location, along with one in Denver’s Central Park neighborhood, on June 27, according to Next Door’s website. 

Next Door, part of the Boulder-based The Kitchen Restaurant Group that Musk founded with chef Hugo Matheson, closed…