The beautiful glass-enclosed space at downtown's CityGarden that previously held Death in the Afternoon will now be a Kaldi's Coffee — offering brunch and lunch food as well as cold-brew coffee, sparking teas and cocktails.The space, at 808 Chestnut Street, has held three concepts since CityGarden opened in 2009, alternating between fancy and casual: Terrace View, the Chili Bowl and then the highly acclaimed Death in the Afternoon, which closed in November. The space has been a popular lunch destination amongst the suits who office downtown, but has had a difficult time balancing that crowd with the families who flock to CityGarden on the weekend.…