John Musso, a 41-year-old Baton Rouge native, returned home in 2023 after building a successful Manhattan luxury real estate career. While affordability, familiar culture and quality-of-life factors helped in luring him back, a mid-century modern home with a pool in the Jefferson Bocage neighborhood was the initial draw. The home’s owner, 93-year-old real estate veteran Betty Phelps, soon became his landlord, friend and mentor. Musso had spent …