Set in the heart of Back Bay, this exquisite direct-access elevator penthouse duplex with private terrace and parking offers the finest standard of living on Boston's most coveted street. Entry to grand arched-entry living room with soaring ceilings and center fireplace surrounded by custom built-ins. Perimeter moldings extend from oversized bow front windows across entire living level, with gleaming hardwood floors throughout. Living room flows to formal dining area opposite half bath, perfect for entertaining. Granite and stainless steel chef's kitchen/family room with center island and breakfast bar, with additional fireplace and wall of custom storage. Large master suite upstairs, with elegant en-suite bath and two walk-in closets. Walkout on this level to stunning private terrace with sweeping views and built-in irrigation system. Large second bedroom also with en-suite bath. Central A/C, private on-site storage, and direct-access deeded parking included. A true masterpiece!