I-405 divides Northwest Portland into two parts: The Pearl District to the east and the older northwest Portland area that includes the area from I-405 to NW Westover Road. This area, especially NW 21st and NW 23rd Avenues have become very popular and are rich with boutique shopping and dining opportunities. Being an older neighborhood it offers a lot of interesting architecture. Many of the condos were formerly apartments that have been converted in recent decades. Buildings tend to be smaller and older than in the neighboring Pearl District.