It looks like after 21 years of supplying the good folks of Beverly Hills with carbohydrates and cleverly flavored cream cheeses, St. Urbain Street Bagels has closed its doors at 451 N. Beverly Dr.   A sad note taped to the front door thanks customers for support and reminds them that they have another location on W. Olympic Blvd.  Windows are papered over, but there’s no indication of what may be replacing it so I’ll keep watching.