The shop has been for lease since at least the beginning of 2016. My guess would be the shop lost its lease. Did you shop at the Old Town Trading Post? What were your thoughts about the shop?
You can find more photos of the closure at this link.
Via the listing
Unique retail space nestled among the most active retailers in the Old Town market at the intersection of King and Union streets. Great opportunity for a tourist-oriented or neighborhood-serving business. Be a part of the waterfront redevelopment that will include a 120-room boutique hotel and additional retail opportunities to open in mid-2017.
*High visibility and traffic storefront on King Street
*Building signage available
*Food permitted. Currently no venting but can be easily permitted
*King Street Trolley with access to King Street Metro station
*Unlimited dining and retail options within walking distance
*Located between Paper Source and LouLou
*Within one block of Starbucks, Virtue Feed and Grain, Pizzeria Paradiso, Ben and Jerry’s, Carluccio’s, Landini Brothers, Fish Market, Blackwall Hitch, Chart House…..The list goes on!