Self-Guided Tours by Appointment Only! Welcome to Patent 523 Apartments, located in vibrant North Capitol Hill. A 10-minute stroll down Broadway from our community will take you to some of the city's best nightlife. It's close enough to walk to but far from the bustling streets. Patent 523 offers 18 floor plans, ranging from studios to 2-bedroom apartment homes. With this variety, you are sure to find something to suit your needs.