A unique investment and lifestyle opportunity in the heart of historic Sandy Hill. This legal duplex delivers charm, functionality, and income potential with bonus spaces that make it unlike anything else on the market. The main unit is ideal for owner occupancy, offering over 1,300 sq ft of character-rich living space featuring hardwood floors, architectural woodwork, and custom-built cabinetry. A spacious front bonus room provides the perfect sunlit space for a home office, sitting room, or creative corner. Live comfortably upstairs in modern style while the secondary unit pays your mortgage or rent both for strong returns. The upper-level unit, currently 2 bed, 2 full bath, is bright, well-maintained, and currently leased. With the right upgrades, there's future potential to convert the second level into two self-contained 1+1 units, paving the way for a legal triplex (buyer to verify). Bonus Outbuilding- Tucked behind the main home is a detached secondary unit with separate electrical breaker formerly the Worldview Art Studio. This heated space is perfect for a home office, yoga studio, artist's loft, or private retreat. A rare addition with endless flexibility and value. Market Context & Location- Sandy Hill remains one of Ottawa's most desirable rental neighbourhoods, thanks to its proximity to the University of Ottawa, downtown core, the Rideau Canal, and the ByWard Market. High demand for student, faculty, and young professional housing ensures strong and consistent rental returns. Similar duplexes in the area are currently yielding cap rates between 78%, with strong appreciation trends over the past 12 months. This property offers Historic charm, Legal duplex with $6,050/month in rental income, R4 Zoning. Whether you're an investor looking for a high-performing asset or a homeowner wanting offset income, 210 Blackburn Avenue delivers versatility, history, and value wrapped in classic Gothic charm.