Enjoying its second winter and flooded with happy strollers and skaters, Newmarket Riverwalk Commons and the refurbished Newmarket Community Centre and Lions Hall are urban oases. Where once there was a sea of cars surrounding two long, dark, shed-like buildings, there is now a long, landscaped finger around a bright architectural beacon. “In the ’burbs, you don’t come together,” offers Ms. Rosenberg. “You might meet over a Wal-Mart aisle, but you don’t come together with that same level of recreation.”Shai Gil