Beneath the earth mound in this park are the foundations of Westbrook Hall, built in 1874 - 1875 for Sarah Beit, widow of William Beit of Westbrook Station. Westbrook Hall, built on land excised from the station was designed as a smaller version of the much larger Westbrook Homestead.
Westbrook Hall was a large bluestone building boasting six bedrooms, drawing room, dining room, study, two bathrooms and a wing consisting of a kitchen, laundry, two servants rooms, dairy, scullery and external cellar. Reputed to have cost £10,000, the fixtures and fittings were of the best quality, and each fireplace was adorned with marble surrounds and mantles. The architect was Richard Suter and the builder, Jack Cameron. The bluestone was quarried from Toowoomba's first quarry which is now the Picnic Point waterfall area.
In 1901 the house became the summer residence for Queensland Governors, Norman and Lamington and following World War One it was used as a convalescent home for returned soldiers. By the 1920s the place was in ruin. In 1926 the building was purchased by Toowoomba City Council. Council demolished the house for the stone and reused it for the walls at the south-western corner of Queens Park.