Located on a gas-lit street near Monument Square, this rarely available, 4BR/3.5BA, two-family home offers 3,593+sf and an extraordinary opportunity for an owner occupant to live in the "owner's unit" and keep a tenant in 1st floor unit; or buyers looking to convert into a spectacular single family home; or a developer/investor to convert into two high-end condos. The grand entrance is defined by soaring ceilings, period moldings, and a sweeping staircase that leads to an impressive formal living room. An elegant dining room flows into a chef's kitchen with luxury finishes and top-tier appliances. A charming family room w/wet bar and gas FP provides an inviting hub for daily living. A spacious primary suite w/fireplace has ample closet space and marble spa bath. An addt'l bedroom and full bath complete this level. The separate entrance, 1BR rental unit in the rear of the first floor is well maintained. The crown jewel is an expansive 480sf private roof deck w/head house, wet bar, and panoramic views of the harbor, Monument, and Boston skyline. An unfinished basement offers future expansion capabilities, and a lush garden patio completes this special offering.