A city of dualities, La Cañada Flintridge is home to both NASA’s Jet Propulsion Laboratory and the pastoral Descanso Gardens, boasting pristine natural beauty yet also at the cutting edge of technology. It’s nestled in the foothills of the San Gabriel Mountains yet only 15 miles from downtown Los Angeles, feeling like a small, rural town in the midst of a megalopolis. Residents love it for the mix of provincial and cosmopolitan — it’s the kind of place where you can get your ice cream from the local drive-through dairy or imported from Verona…