Beacon Hill is Boston's most iconic residential address, and its real estate market reflects two centuries of architectural preservation. Federal-style brick rowhouses line gas-lit cobblestone streets, with interiors that have been meticulously updated behind historically protected facades. Full-floor and duplex condominiums within these buildings represent the majority of available inventory, offering original mantels, exposed brick, and period moldings alongside renovated kitchens and baths. Rare single-family townhouses command extraordinary premiums when they surface, often trading privately before reaching the open market. Ceiling heights, outdoor space, and parking — each scarce by Beacon Hill standards — become significant value drivers at every price point. This is a neighborhood where provenance matters as much as product, and where the right property holds its value across generations.