The year-old Pike & Rose development in North Bethesda has suffered its first casualty: City Sports, one of the first tenants to open there last November, says it will close up shop by the end of this month. The decision follows last week’s Chapter 11 filing for the Boston-based chain, which is also closing its Silver Spring store and possibly other D.C.-area locations. This is the second sporting goods retailer to go belly-up on Rockville Pike this fall; Hudson Trail Outfitters called it quits last month and is currently liquidating its store at Montrose Crossing. But it’s a whole different story for the Pike’s thriving REI store, which recently signed a lease for 36,000 square feet in Phase II of Pike & Rose. This week we heard some speculation that REI might take over the much-smaller City Sports space instead of waiting until 2017 for its new store to open. But Federal Realty, the developer of Pike & Rose, says that’s not going to happen. “We’re confident we will replace City Sports with a great retailer or restaurant that will be additive to the Pike & Rose neighborhood,” a company spokesman tells us.