On the sunny side of beautiful Avon Hill, 33 Agassiz Street is a spacious, finely wrought 1890 Queen Anne landmark ideally suited for today's world. From the slate roof's copper finials to the sculptural chimney to the granite arches that mark its facade, the house is one of the finest works by Boston architect Eugene Clark. The level corner lot is nearly a quarter acre, with a fenced back yard overlooked by a wide deck perfect for parties. Inside, spaces flow graciously from formal to informal, with airy and light-filled rooms on all three floors. Throughout the house, period details are joined by modern improvements of the highest quality: a professionally engineered HVAC system with Viessmann heating and Lennox cooling; foam insulation; luxurious bathrooms; and a new designer-built kitchen with walnut-top island, Wolf cooking appliances, two Miele dishwashers, and Sub-Zero refrigerators. An amazing property, close to the shops, restaurants, and Red Line stop in Porter Square.