This is Summerhill, the oldest building on the Queen's University campus, a graceful Neoclassical villa built as home for George Okill Stuart, Anglican Arch-deacon, in 1839. Remarkably old. Changed over time, but in recent years, much restored and nicely maintained.
now) a central block with flanking pavilions and linking colonnaded porches, is evident in this 1858 drawing.
The College had begun in a wood frame house on the edge of town, with 2 profs and 13 students. Despite the classy new digs, the college continued to struggle financially, and suffered growing pains as it strove to establish identity and direction.
The interpretive panels go on to explain the challenges, and principals who made a difference. I won't. For me, the visit was about taking in the beauty of the place and the day.
Do drop by yourself, and swot up.